Image Size Checker: Check Dimensions, Width, Height and Aspect Ratio
Upload an image locally to check its pixel width, height, aspect ratio, file size, and format before you choose a YouTube thumbnail, Instagram post, LinkedIn banner, Open Graph preview, ecommerce product image, or safe-area workflow.
Image size answer
To answer what size is this image, check the exported file itself. ImageSizeKit reads width, height, aspect ratio, file size, format, orientation, megapixels, and the nearest publishing route locally in your browser.
Choose your image-size task
Website and unknown image-size queries
Broad image-size searches usually need file facts first. These shortcuts separate website images, unknown files, generic image checks, and website thumbnail previews before routing to a platform guide.
website image size checker
Check the exported website image file first, then route Open Graph, hero, blog, or landing-page visuals by destination.
what size is this
Read the real width, height, aspect ratio, file size, and format before choosing a platform guide.
image size checker
Use the browser checker for local file facts, then open the nearest YouTube, social, marketplace, or website route.
website thumbnail size
Check the source file, then compare Open Graph image size and website preview-card requirements.
Reports
width, height, ratio
Matches
social, ecommerce, YouTube
Privacy
browser-only check
Next step
recommended guide
AI answer card
Quick answer
- Best size
- Use the actual pixel width and height from your exported image file
- Best ratio
- Read the ratio from the file, then match it to the target platform
- Use when
- Use this checker when you already have an image file and need to know whether it fits YouTube, Instagram, LinkedIn, Open Graph, Etsy, Shopify, or another image workflow.
- Avoid
- Avoid guessing from a design template name. Check the exported file because compression, crop, screenshots, and downloads can change dimensions.
- Check with
- Image Size Checker
- Last checked
- August 9, 2026
- Source boundary
- This page reads local file metadata in your browser. ImageSizeKit does not upload or store selected images.
Check a website or unknown image size locally
Upload a website graphic, paste an unknown image, or use the prefilled 1200 x 630 website-share starter size to identify width, height, ratio, format, file size, and the nearest publishing workflow.
If a guide sent you here, start with the exact exported file, then open the recommended next guide for crop, safe-area, text, metadata, or upload-limit checks.
Drop images here, paste from clipboard, or choose files.
JPG, PNG, GIF, WebP, and AVIF files are read locally in your browser. Use CSV export when checking a batch for a designer, client, or publishing checklist.
Arriving from a thumbnail, banner, Open Graph, LinkedIn, or safe-area guide? Check the final export here first, then follow the recommended next guide.
Only know the width and height?
Enter pixel dimensions to route the image shape without uploading a file. Use the file picker later for format and file-size checks.
This page starts with a website share image: 1200 x 630. Press Check 1200 x 630 website image for a one-step diagnosis, then upload the final file when you need format and file-size evidence.
Try a common size without uploading:
Choose the exact exported image
Read width, height, ratio, file size, and format
Open the recommended guide, copy the result, or export CSV
Canonical result route
Canonical image size checker result action map
Use this short map after the checker reads a file. It turns raw dimensions into the first canonical action: keep evidence, read the shape route, check Open Graph previews, route reusable social assets, or reject proxy files before approval.
Final file identity is clear
Keep result evidence
Keep width, height, ratio, format, and file size with the exact upload asset before routing it to a platform guide.
Shape points to a known surface
Read shape route
Use the measured ratio to choose thumbnail, vertical cover, square profile, banner, Open Graph, or product-image guidance.
Website share-card candidate
Check OG preview
Route 1200 x 630 or 1.91:1 files to Open Graph preview checks before debugging metadata or cache.
Wide, vertical, square, or product asset
Route social asset
Open the social checker when the same file may be reused across posts, covers, banners, profiles, or marketplace listings.
Screenshot, CMS crop, or proxy file
Recheck source file
Do not approve the checked dimensions yet. Find the original export, rerun the checker, then choose the publishing route.
After the checker result
Turn one completed image check into the next publishing step
A completed image check should create a decision, not just a number. Use the result to route the file, repair the export size, check website thumbnail requirements, or keep a copyable record for review.
Need the closest platform route
Route checked image
Open the recommended guide from the result card, then confirm crop, safe area, file-size limits, and readability.
Need a website thumbnail or share card
Check website thumbnail
Use Open Graph image guidance when the checked file is close to 1200 x 630 or will be attached to a page URL.
Need to fix the current dimensions
Calculate replacement size
Calculate a clean replacement width and height before re-exporting from the design source.
Need a record for review
Keep result record
Copy the result for one file or export CSV after batch checks so the size decision can travel with the asset.
File facts to publish route order
Use this order after the checker reads an image. It keeps the final export, measured shape, publishing surface, and review record together so the result becomes a route to publication instead of a loose width-and-height lookup.
| Route stage | File fact to confirm | Publishing route | Open |
|---|---|---|---|
| Confirm the checked file is the final export | File name, format, file size, width, height, and source context are attached to the exact upload asset. | If the file came from a screenshot, chat preview, CMS thumbnail, or downloaded preview, return to the source export before routing it. | Check final file |
| Classify the shape before resizing | The measured ratio is 16:9, 9:16, 1:1, very wide, about 1.91:1, product-style, or an unclear near-match. | Use the shape to choose thumbnail, Shorts, square profile, banner, Open Graph, marketplace, or calculator guidance. | Read shape signal |
| Choose the publishing surface | The destination is known: YouTube, social post, profile image, banner, website card, marketplace listing, or product page. | Open the matching ImageSizeKit guide for crop, safe-area, text, metadata, product zoom, or upload-limit checks. | Route publishing surface |
| Keep a reviewable size record | The result can be copied for one file or exported as CSV for a batch of checked images. | Attach the result record to a ticket, client note, upload checklist, or content calendar before requesting approval. | Keep result record |
Image size checker quick answer
This tool checks the real size of an exported image file: width, height, aspect ratio, file size, format, megapixels, orientation, and the closest ImageSizeKit guide. Use it when you searched for image size checker, image dimension checker, check image size, what size is my image, YouTube picture dimensions, or image size for YouTube.
Need the raw pixel size?
Run the local checker and read the actual file width and height.
Need a YouTube image guide?
Route the file to thumbnail, Shorts, banner, profile, watermark, podcast, or Community image guidance.
Need 16:9 export math?
Calculate a clean width or height before exporting a replacement file.
Image check publish decision standard
Treat the local dimension result as a publishing gate, not just a number lookup. A file is ready only when the measured dimensions match the intended placement, the checked file is the final export, and the next platform guide does not flag crop or upload issues.
| Checker evidence | Publishing decision | Next route |
|---|---|---|
| Dimensions match and the file is final | Open the recommended platform guide and confirm crop, safe area, text readability, and file-size rules before upload. | Open route |
| Shape matches but the image is smaller than ideal | Re-export from the original design at a larger canvas or calculate a clean replacement size before publishing. | Open route |
| The checker only sees a screenshot or preview | Find the source export because downloaded previews, screenshots, and CMS thumbnails often report the wrong production size. | Jump on page |
| The file has no clear platform match | Route by publishing surface: thumbnail, vertical cover, banner, link preview, marketplace image, or product photo. | Jump on page |
Checked file handoff matrix
Use this matrix when an image-size result needs to move from the checker into a designer note, SEO preview task, social campaign review, marketplace upload, or approval record. The result should travel with the next route, not as a bare width and height.
| Handoff case | File evidence | Next action | Route |
|---|---|---|---|
| Designer needs a re-export note | Width, height, ratio, format, and file size are known, but the canvas or export size is wrong. | Send the copied result with the target route so the designer can re-export from the original source file. | Calculate replacement |
| SEO or developer needs a website preview image | The file is close to 1200 x 630 or another 1.91:1 website share-card shape. | Use Open Graph guidance before debugging metadata, canonical URLs, redirects, or preview cache. | Check OG preview |
| Creator team needs a video upload image | The file is 16:9, 9:16, square, or wide and likely belongs to a YouTube asset workflow. | Route the result to the YouTube image hub before choosing thumbnail, Shorts, profile, banner, or Community guidance. | Route YouTube image |
| Social team needs a reusable campaign asset | The same image may be reused as a post, story, profile image, banner, link preview, or creator bio visual. | Open the social checker and choose the final publishing surface before resizing. | Route social image |
| Marketplace or ecommerce owner needs product image fit | The file is square, high-resolution, product-like, or destined for Shopify, Etsy, Whatnot, or a listing card. | Route product images by marketplace behavior instead of treating them as generic social images. | Check product route |
| Reviewer needs a record for approval | The image has been checked and the result must travel with a ticket, client note, content checklist, or batch review. | Copy the result or export CSV, then attach the nearest ImageSizeKit route as the follow-up decision. | Keep review record |
Image size result-to-publish package
Use this package when a checked image needs to leave the browser and become a real upload, ticket, content calendar item, client note, or production approval. The package keeps the measured result, next route, decision, and owner together so the file does not become another disconnected screenshot or preview.
| Package item | Required evidence | Publish risk | Route |
|---|---|---|---|
| Measured file facts | Width, height, aspect ratio, file size, format, orientation, and whether the checked file is the final upload asset. | The team approves a screenshot, CMS thumbnail, chat preview, or editor canvas instead of the actual file that will be uploaded. | Check final file |
| Recommended route | The result is attached to one next ImageSizeKit page: thumbnail, Shorts, banner, Open Graph, social, marketplace, or product image. | A valid dimension result is treated as final even though crop, safe area, metadata, or upload-limit checks still belong on another page. | Route image |
| Fix or approve decision | A clear status: approve, re-export larger, crop to target ratio, check safe area, compress once, or return to source artwork. | The file is edited repeatedly without naming the first failed gate, which creates conflicting exports and soft images. | Read result |
| Copy or CSV record | A copied result for one file or CSV export for a batch, kept with the ticket, client note, upload checklist, or content calendar. | The file passes once in the browser but the approval record loses the exact dimensions, ratio, file size, and next route. | Keep record |
| Owner handoff | The next owner is named: designer, SEO/developer, creator team, social team, ecommerce owner, or reviewer. | The checked image has no owner for the next action, so it stalls after the size lookup instead of reaching publication. | Assign route |
Image size checker final evidence acceptance record
Use this acceptance record when the checker result needs to be trusted by someone else. It keeps final file identity, publishing route, repair decision, reviewable evidence, and cross-platform reuse boundaries attached to the image before upload, approval, or handoff.
| Acceptance gate | Evidence to keep | Accept when | Validate |
|---|---|---|---|
| Final file identity | File name, format, file size, width, height, aspect ratio, and whether the checked item is the actual upload file. | The result was created from the exported asset that will be uploaded or handed off, not a screenshot, chat preview, CMS crop, or design canvas. | Check final file |
| Publishing surface match | One named route is attached to the result: YouTube, social, banner, Open Graph, marketplace, product image, or generic website image. | The file has a next page for crop behavior, safe area, text readability, metadata, marketplace rules, or platform-specific file limits. | Choose route |
| Repair decision record | A single decision is kept with the result: approve, crop, re-export larger, compress once, change format, or return to source artwork. | The next action is explicit enough that another person can reproduce the fix without guessing why the image failed. | Read result |
| Reviewable handoff | Copied result or CSV export, plus owner name and destination page for the next check. | The checked image can move into a ticket, content calendar, client note, upload checklist, or approval record with the evidence intact. | Keep evidence |
| Cross-platform reuse boundary | A note explaining whether the same file is allowed to become a social post, website card, banner, product image, or creator profile asset. | Reuse is routed through the social, banner, Open Graph, or product-image workflow instead of assuming one size works everywhere. | Check reuse |
Image checker result to upload acceptance coverage map
Use this coverage map after the local checker returns width, height, ratio, format, and file size. It routes the measured result into the upload acceptance page that can verify crop behavior, metadata, product detail, marketplace reuse, thumbnail readiness, or source-file trust before the image is approved.
| Checker signal | Likely surface | Acceptance record to keep | Validate |
|---|---|---|---|
| 16:9 landscape thumbnail candidate | YouTube thumbnail, video cover, website video card, or marketplace show thumbnail | Keep final file facts, text readability, format, file size, and whether the same 16:9 image should become a thumbnail or a website share card. | YouTube thumbnail upload readiness |
| 9:16 vertical cover candidate | YouTube Shorts cover, Instagram Reel cover, Story image, or vertical social video cover | Confirm cover-frame placement, center-safe text, and whether the vertical export needs Shorts, Reel, Story, or broad social routing. | Shorts cover readiness |
| Very wide banner or header candidate | YouTube banner, LinkedIn banner, Facebook cover, website header, or profile cover | Validate mobile crop, profile overlays, safe-area proof, and whether each platform needs a separate wide export. | Banner upload acceptance |
| About 1200 x 630 or 1.91:1 candidate | Open Graph image, website share card, landing-page preview, or campaign URL card | Validate local file facts plus metadata, crawler access, platform cache behavior, and wrong-surface escape route. | Open Graph preview acceptance |
| Square or near-square social candidate | Instagram feed post, carousel image, profile-style crop, product photo, or creator bio visual | Choose feed, profile, product, or creator reuse before crop review so one square image is not approved for every platform. | Social upload acceptance |
| Large product-style image | Shopify product image, Etsy listing image, marketplace product card, or product detail visual | Keep product detail visibility, zoom quality, listing crop, and reuse boundary before treating the file like a generic social post. | Shopify product upload acceptance |
| Marketplace seller, show, or listing asset | Whatnot seller cover, show thumbnail, livestream card, Etsy listing, or marketplace promo image | Record whether the file is a seller profile asset, show thumbnail, listing image, or product card before upload approval. | Whatnot upload acceptance |
| Unknown, screenshot, CMS thumbnail, or compressed proxy | Untrusted source file that should not be approved yet | Return to the original export, rerun the checker, then choose a platform route only after the file identity is trustworthy. | Recheck source file |
How to find this checker from ImageSizeKit
Image Size Checker is the general file-reading step in the ImageSizeKit workflow. It is linked from the homepage, YouTube hub, social media hub, aspect-ratio calculator, and Open Graph checker so crawlers and users can reach it before choosing a platform-specific guide.
| Discovery route | Use when | Open |
|---|---|---|
| Homepage tool router | Start here when you only know that an image export needs a size check before upload. | Open route |
| YouTube Image Sizes hub | Use this route when the checked file may be a YouTube thumbnail, banner, Shorts frame, profile image, or Community post. | Open route |
| Social Media Image Sizes hub | Use this route when the file may belong to Instagram, Facebook, LinkedIn, Open Graph, Etsy, Shopify, or Whatnot. | Open route |
| Aspect Ratio Calculator | Use this route when the current dimensions are wrong and you need a clean replacement export size. | Open route |
| Open Graph Preview Checker | Use this route when the checked file is meant to become a website share-card image. | Open route |
What this checker reads
The checker reads width, height, file size, format or MIME type, aspect ratio, megapixels, orientation, nearest platform match, and suggested next page.
It is meant for fast export decisions: first confirm the raw image size, then open the matching YouTube guide for upload limits, safe areas, crop behavior, product-photo quality, or text readability.
Image size checker search intent map
People use image size, image dimensions, and aspect ratio phrases interchangeably. Use this map to choose whether you should run the local checker, calculate a new ratio, or open a platform-specific guide.
| Search phrase | What you likely need | Best next step |
|---|---|---|
| image dimension checker | Read width, height, ratio, format, file size, and nearest workflow match from an exported file. | Jump on page |
| image dimensions checker | Use this synonym when you need the actual pixel width and height of a local image file. | Jump on page |
| image size checker | Use this page when you need the actual pixel size of a file, not a design-template guess. | Jump on page |
| photo size checker | Check a downloaded or exported photo before choosing a platform-specific upload guide. | Jump on page |
| picture size checker | Read the dimensions of an existing picture, then route it to the closest image size guide. | Jump on page |
| check image size | Upload the file locally, then route it to the closest YouTube, social, ecommerce, or Open Graph guide. | Jump on page |
| check image dimensions online | Use the browser checker without creating an account or uploading the image to ImageSizeKit. | Jump on page |
| website image size checker | Use this when an exported website image, blog visual, landing page graphic, or social preview image needs a width, height, ratio, and file-size check. | Jump on page |
| what size is this | Use this checker to identify the real pixel dimensions of an unknown image file before choosing a platform guide. | Jump on page |
| what size is my image | Read the file dimensions first, then open the matching platform guide before publishing. | Jump on page |
| thumbnail image size | Check the exported file first, then decide whether it is a YouTube thumbnail, Open Graph preview, Shorts cover, or social video cover. | Jump on page |
| thumbnail dimensions | Use the measured ratio to choose a 16:9, 9:16, square, or link-preview thumbnail workflow. | Jump on page |
| linktree image size | Check the image locally, then use the social image hub when the file is a profile image, link preview, or creator bio visual. | Open tool |
| poster size checker | Use this checker for raw dimensions, then choose the nearest social, thumbnail, banner, or marketplace image workflow. | Jump on page |
| image aspect ratio checker | Read the current ratio, then use the aspect-ratio calculator if the file needs a new export size. | Open tool |
| youtube picture dimensions | Check the exported file first, then decide whether it is a thumbnail, banner, Shorts frame, profile picture, or Community post image. | Open tool |
| image size for youtube | Use this checker when you already have a YouTube image file and need width, height, ratio, and next-page routing. | Open tool |
| youtube photo size | Read the photo dimensions, then choose profile picture, Community post, podcast artwork, thumbnail, or banner guidance. | Open tool |
Recent broad image-size query routing
Use these routes when a broad dimension-checking query describes the file but not the final platform yet. Recent broad queries reaching ImageSizeKit include image size checker, website image size checker, website thumbnail size, what size is this, and set image size variants. The checker reads the image facts first, then routes to the nearest publishing workflow.
| Broad query | What to do first | Next route |
|---|---|---|
| website image size checker | Check the exported website graphic, blog visual, landing page image, or Open Graph source before publishing it online. | Open route |
| website thumbnail size | Check the image file first, then decide whether it should follow Open Graph image size, website preview, or social card rules. | Open route |
| image size checker | Read width, height, aspect ratio, file size, and format locally before choosing a YouTube, social, marketplace, or website workflow. | Run checker |
| set image size / setimagesize | If you are trying to set a new image size, read the current dimensions first, then calculate a clean replacement width and height. | Open route |
| what size is this | Use this checker when the image file is unknown and you need raw dimensions before choosing a guide. | Run checker |
| linktree image size | Check the local dimensions first, then route profile, creator bio, or link-page images through the social media image size hub. | Open route |
| poster size checker | Measure the file first, then decide whether it behaves like a social post, Story, thumbnail, banner, Open Graph image, or product photo. | Open route |
Core checker routing bridge
Broad image-size searches often start before the publishing surface is clear. This page is the canonical Image Size Checker URL; the legacy image dimension checker path redirects here so users can read the file facts first, then choose the most specific YouTube, social, banner, marketplace, or Open Graph workflow.
| Bridge route | Why it matters | Open |
|---|---|---|
| YouTube Thumbnail Size | Use this route when the checked file is a standard 16:9 YouTube video thumbnail and needs upload-readiness checks. | Open route |
| YouTube Shorts Thumbnail Size | Use this route when the checked file is vertical, social-video shaped, or likely to become a Shorts cover frame. | Open route |
| YouTube Banner Safe Area | Use this route when a wide file may need safe-area, banner, channel art, or profile-header routing. | Open route |
| Social Media Image Checker | Use this route when the image may be a social, creator, poster, Linktree-style, marketplace, or ecommerce asset. | Open route |
| Open Graph Preview Checker | Use this route when the checked file is meant to become a website share-card image before metadata or cache debugging. | Open route |
How this image size checker is different
Use this checker before platform-specific guidance when you only have an exported file. It separates the file-reading tool from the legacy redirect, static platform guides, and deployed-page preview checks.
| Differentiation point | Why this page is distinct | Recommended next step |
|---|---|---|
| Generic file evidence | This page reads the actual local file before the user knows whether the image is a thumbnail, banner, profile picture, product photo, or Open Graph card. | Keep the checker as the first-pass evidence page, then route to the platform guide after width, height, ratio, format, and file size are known. |
| Not the legacy URL | The legacy /image-dimension-checker/ path permanently redirects here, so there is one canonical tool URL for broad image dimension checker queries. | Keep canonical, breadcrumb, and internal links pointed at /image-size-checker/. |
| Not a static guide | Platform guides explain target sizes, but this page actually processes single files, pasted screenshots, and batches in the browser. | Expose local processing, Copy result, Export CSV, and recommended-route events near the tool and in schema. |
| Not an Open Graph URL preview | Open Graph Preview Checker starts after a page URL is deployed; this checker starts earlier with the image file itself. | Route share-card files to /open-graph-preview-checker/ only after the file dimensions are known. |
Unknown image file routing
If you searched for what size is this, thumbnail image size, thumbnail dimensions, linktree image size, website image size checker, or poster size checker, start with the local file facts. Then route the image by where it will be published, not only by its current pixel count.
It looks like a thumbnail
16:9 usually points to YouTube thumbnail or video cover work; 9:16 points to Shorts, Reels, Stories, or vertical cover frames.
It came from a website or blog
Check whether the file is a hero image, article image, Open Graph preview, or compressed preview export before reusing it.
It is for a creator profile or Linktree-style page
Square and portrait images often need crop-safe profile or social bio treatment, not just a raw pixel-size pass.
It is a poster, flyer, or promo graphic
Measure the file first, then choose whether the final destination behaves like a feed post, story, banner, thumbnail, or product image.
Which page should I open after checking?
The checker is a routing step. Once you know the file dimensions, open the matching guide to confirm safe areas, crop rules, file-size limits, and platform-specific upload notes.
16:9 thumbnail or video image
Open the matching ImageSizeKit guide after reading your file dimensions.
9:16 vertical cover frame
Open the matching ImageSizeKit guide after reading your file dimensions.
Wide banner or header
Open the matching ImageSizeKit guide after reading your file dimensions.
Website link preview image
Open the matching ImageSizeKit guide after reading your file dimensions.
Why your image size check may fail
A failed dimension check does not always mean the design is unusable. It usually means the final exported file needs one more routing decision: resize the canvas, crop to the correct ratio, check safe areas, or verify the exact file you plan to upload.
| Checker result | Likely cause | Fix before publishing | Next route |
|---|---|---|---|
| The ratio is close, but the file is too small | The design probably used the right shape but exported below the platform's practical size floor. | Re-export from a larger canvas, then check again before opening the platform upload screen. | Open route |
| The ratio is wrong | The file may have been cropped, screenshot, downloaded from a preview, or exported from the wrong artboard. | Crop or resize to the target ratio, then open the closest ImageSizeKit guide for safe-area and file-limit checks. | Open route |
| The file is large enough, but text may still crop | Dimension checks cannot prove that logos, captions, or calls to action are inside a platform crop-safe region. | Open the matching banner, profile, Shorts, or Open Graph guide and check crop behavior before publishing. | Open route |
| The file type is not the final export | Design exports, screenshots, and downloaded previews can differ from the original canvas or source image. | Check the exact JPG, PNG, WebP, AVIF, or GIF file that you plan to upload. | Check again |
Image size checker result priority matrix
Use this matrix after the checker reads the file. Fix the highest-risk issue first: confirm the file is the final upload asset, route it to the right publishing surface, check crop-sensitive placements, then handle Open Graph, product-image, or source-quality repairs.
| Priority signal | Fix first | Why it matters | Next route |
|---|---|---|---|
| Not the final upload file | Check the exact exported JPG, PNG, WebP, AVIF, or GIF before making any platform decision. | Screenshots, CMS thumbnails, chat previews, and copied images can report dimensions that do not match the production upload file. | Check final file |
| Wrong publishing surface | Route the image by final destination before resizing or compressing it. | A square product photo, 9:16 vertical cover, 16:9 thumbnail, wide banner, and 1.91:1 share card need different next checks. | Route unknown image |
| Crop-sensitive wide or vertical file | Check safe areas before approving text, logos, faces, products, or calls to action. | Correct dimensions cannot prove crop safety on mobile, profile, banner, Story, Reel, Shorts, or cover surfaces. | Check crop risk |
| Website share-card candidate | Separate local file dimensions from Open Graph metadata and preview cache behavior. | A correct source image can still render a blank, stale, or wrong card after the page URL is deployed. | Check OG preview |
| Product or marketplace image | Route selling images by marketplace or product-card behavior. | Product zoom, listing crops, seller cards, and marketplace thumbnails have different quality priorities from generic social images. | Check product image |
| Only source size or softness remains | Calculate a cleaner replacement size or re-export from the original design file. | Once the surface is known and crop risk is handled, softness is usually an export-size, compression, or source-quality issue. | Calculate replacement |
How to read the checker result
Use the output as a compact decision card. The checker gives you file facts; the guide pages explain crop behavior, upload limits, text readability, safe areas, and platform-specific exceptions.
Width and height
The actual pixel dimensions of the selected file.
Use them to decide whether the image is large enough for a thumbnail, banner, profile picture, product photo, or share card.
Aspect ratio
The shape of the image, such as 16:9, 9:16, 1:1, 4:1, or 1.91:1.
Use it to route the file to the right guide before worrying about visual crops or file-size limits.
Best match
The closest ImageSizeKit workflow based on size and ratio.
Treat it as a routing suggestion, then verify platform-specific details on the suggested next page.
Crawlable answers from one image size check
A useful image size check should produce answers that can be copied, reviewed, and routed. These are the stable facts this page creates from one local file check before the user opens a platform-specific guide.
| Checker evidence | What the page answers | How to use the answer | Next step |
|---|---|---|---|
| Pixel dimensions | The checker reports the exact width and height from the selected local file. | Use this answer for image dimension checker, what size is this image, and website image size checker queries before picking a platform guide. | Jump on page |
| Aspect ratio | The checker converts the measured width and height into a readable ratio such as 16:9, 9:16, 1:1, 4:1, or 1.91:1. | Use the ratio to decide whether the file belongs to thumbnail, vertical cover, square profile, banner, Open Graph, or product-image workflows. | Jump on page |
| File size and format | The checker keeps file size and image format beside the dimension result. | Use this evidence before compression, JPG vs PNG decisions, upload-limit checks, or batch review handoff. | Jump on page |
| Nearest workflow match | The checker suggests the closest ImageSizeKit route based on dimensions and image-shape signals. | Use the recommended route to move from raw file facts into crop, safe-area, metadata, marketplace, or platform-specific guidance. | Jump on page |
File facts to platform decision matrix
After the checker reads width, height, ratio, format, and file size, use the file facts to choose the publishing route. This prevents a screenshot, preview crop, or reused design export from being treated as the wrong asset type.
| Checker fact | Likely platform meaning | Decision before publishing | Route |
|---|---|---|---|
| 16:9 ratio | The file is probably a YouTube thumbnail, long-form video cover, or wide video preview candidate. | Check thumbnail dimensions, file size, format, and text readability before upload. | Open thumbnail checker |
| 9:16 ratio | The file is probably a Shorts frame, Reel cover, Story image, or vertical social-video cover. | Check whether the final destination needs a Shorts frame, Instagram Reel cover, or broader social image route. | Open Shorts guide |
| 1:1 square | The file may be a profile image, channel icon, product image, podcast cover, watermark, or square feed post. | Check circular crop, profile-safe content, product-photo quality, or square-post requirements. | Check square image |
| Very wide ratio | The file may be a channel banner, LinkedIn banner, Facebook cover, profile header, or wide marketplace cover. | Route wide exports through the banner checker before assuming it is YouTube-only channel art. | Check banner route |
| About 1.91:1 | The file may be an Open Graph image, website thumbnail, social share card, or link preview graphic. | Use the Open Graph guide for 1200 x 630 sizing, then preview the deployed URL if metadata is already live. | Check OG image |
| Large product-style image | The file may belong to ecommerce or marketplace publishing rather than a creator thumbnail. | Route by selling surface when the image is for Shopify, Etsy, Whatnot, or another marketplace workflow. | Route product image |
| Unknown or near-match ratio | The file facts do not clearly match one platform or the image may be a screenshot, preview, or downloaded crop. | Use the aspect ratio calculator or social image checker before editing the source file again. | Calculate clean size |
What makes this a practical image size checker
This page is not only a static size table. It reads the actual exported file in the browser, supports single or batch checks, accepts pasted images, and creates copyable or CSV-ready results for publishing workflows.
| Workflow | How to use it | What to do with the result |
|---|---|---|
| Single exported file | Drop, choose, or paste one JPG, PNG, GIF, WebP, or AVIF file. | Use the result card to copy width, height, ratio, format, file size, best match, and the recommended next page. |
| Batch image size check | Choose or drop multiple images when a designer, client, or publishing checklist needs several exports reviewed together. | Use the comparison table to spot wrong ratios, then export a CSV record before requesting revisions. |
| Clipboard screenshot check | Paste an image from the clipboard when you only have a screenshot or downloaded preview. | Confirm whether the screenshot is the real upload file or just a smaller preview that needs a source export. |
Exportable image check results
After checking an image, keep the result attached to the publishing decision. A copied summary is useful for quick review, while CSV export is better for batches of social images, Open Graph previews, marketplace photos, or YouTube thumbnail variants.
Copy result
Creates a plain-text summary with file name, dimensions, aspect ratio, file size, format, best match, recommendation, and next page.
Use it in comments, support tickets, client review notes, or a content production checklist.
Export CSV
Creates a spreadsheet-friendly file with one row per checked image and columns for width, height, ratio, orientation, match status, and next page.
Use it when checking a batch of thumbnails, banners, social previews, or product images before handoff.
Open recommended guide
Routes the active image to the closest ImageSizeKit workflow, such as YouTube thumbnail, LinkedIn banner, Open Graph image, Etsy listing, or Shopify product image.
Use it after the raw file check to verify platform crops, safe areas, file limits, and readability.
YouTube picture dimensions routing
If you searched for YouTube picture dimensions, image size for YouTube, or YouTube photo size, start by reading the actual file size here. Then use the YouTube image sizes hub to choose the correct asset page instead of treating every YouTube image as a standard video thumbnail.
16:9 file
Usually a standard video thumbnail or wide preview candidate.
9:16 file
Usually a Shorts cover frame or vertical video image candidate.
1:1 file
Usually a profile picture, watermark, podcast cover, or square post candidate.
What your image dimensions mean
Use the result as a decision card. The same exported image can look correct in a design tool but still be the wrong shape for the upload surface, the wrong file size for the platform, or too small for sharp previews.
| Checker result | Likely meaning | Best next page |
|---|---|---|
| 16:9 landscape | Usually a YouTube thumbnail, video cover, or wide preview candidate | Open guide |
| 9:16 portrait | Usually a Story, Reel, Short, or vertical cover frame candidate | Open guide |
| 1:1 square | Usually a profile picture, product photo, or square feed post candidate | Open guide |
| Very wide banner | Usually a channel art, cover photo, or profile banner candidate | Open guide |
| About 1.91:1 | Usually an Open Graph or social link preview candidate | Open guide |
| Large square product photo | Usually a marketplace or ecommerce image candidate | Open guide |
Supported first-pass matches
| Asset | Dimension signal | Recommended next page |
|---|---|---|
| YouTube thumbnail | 16:9 at 3840 x 2160, 1920 x 1080, or 1280 x 720 | Open guide |
| YouTube Shorts cover | 9:16 at 1080 x 1920 | Open guide |
| YouTube profile picture | 1:1 square, at least 98 x 98, ideally 800 x 800 | Open guide |
| YouTube banner | 16:9 at 2560 x 1440 plus 1546 x 423 safe area | Open guide |
| Instagram square post | 1:1 at 1080 x 1080 | Open guide |
| LinkedIn profile banner | 4:1 at 1584 x 396 | Open guide |
| Open Graph image | 1.91:1 at 1200 x 630 | Open guide |
| Whatnot cover image | 750 x 424 seller banner or cover image | Open guide |
| Etsy listing image | Square or high-resolution product photo, often 2000 px or larger | Open guide |
| Shopify product image | Square product photo, commonly 2048 x 2048 for zoom quality | Open guide |
Common checks before editing
Use the checker before opening a design tool when you are not sure what image you already have. It helps you separate a true 16:9 thumbnail from a near-match, a square profile source from a cropped rectangle, and a vertical Shorts frame from a portrait image that still needs resizing.
The result is a starting point, not a final publishing decision. You should still check platform-specific requirements such as file-size limits, safe areas, circular crops, text readability, and whether the image needs a larger source export for sharp previews on high-density screens.
Local image privacy
This checker runs in your browser and does not upload or store your image. The file is used only to read local dimensions and show a preview on this page.
Read the privacy policyImage size checker FAQ
How do I check image dimensions?
Open the Image Size Checker, choose an image, and the tool reads its pixel width, height, aspect ratio, file size, format, orientation, and nearest image workflow match.
Does ImageSizeKit upload my image?
No. The checker runs in your browser and ImageSizeKit does not upload or store your image.
Which image sizes can this checker match?
The checker can match common YouTube, Instagram, Facebook, LinkedIn, Open Graph, Etsy, Shopify, Whatnot, and generic square, landscape, or portrait image workflows.
What should I do after checking dimensions?
Open the suggested next page for the asset type, then confirm crop, safe area, text readability, and upload limits before publishing.
Related image size tools
How to Check Image Dimensions Before Upload
Use the full pre-upload workflow before routing a file to a platform guide.
Social Media Image Checker
Check creator, social, and ecommerce image dimensions in one workflow.
Banner Size Checker
Check wide channel, profile, Page, and cover image dimensions.
Open Graph Preview Checker
Check website share image dimensions before publishing.
YouTube Thumbnail Size
Check 16:9 thumbnail dimensions, file size, and upload readiness.
YouTube Shorts Thumbnail Size
Plan vertical 1080 x 1920 Shorts cover frames.
YouTube Profile Picture Size
Check square profile images and circular crop safety.
YouTube Banner Size
Plan a 2560 x 1440 channel art canvas.
YouTube Banner Safe Area
Preview the centered 1546 x 423 safe area.
Aspect Ratio Calculator
Calculate matching widths and heights before export.