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.
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 1, 2026
- Source boundary
- This page reads local file metadata in your browser. ImageSizeKit does not upload or store selected images.
Check image dimensions locally
Choose, drop, or paste one or more images to read width, height, aspect ratio, file size, format, orientation, and closest publishing workflow. The check runs in your browser and does not upload or store your image.
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.
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 |
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 |
Early Search Console query routing
ImageSizeKit is starting to receive impressions for broad dimension-checking queries. Use these routes when the query describes the file but not the final platform yet.
| Observed 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 |
| image size checker | Read width, height, aspect ratio, file size, and format locally before choosing a YouTube, social, marketplace, or website workflow. | Run checker |
| 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 |
GSC P0 core checker discovery bridge
Search Console still routed broad image size checker queries through the homepage while the legacy image dimension checker URL was not reliably discovered on August 1, 2026. This page is the canonical Image Size Checker URL; the legacy image dimension checker path redirects here so crawlers and users land on one primary tool.
| Bridge route | Why it matters | Open |
|---|---|---|
| YouTube Thumbnail Size | Submitted and indexed in the August 1 P0 URL Inspection run. Use it as the strongest 16:9 upstream path into this generic file checker. | Open route |
| YouTube Shorts Thumbnail Size | Submitted and indexed in the August 1 P0 URL Inspection run. Use it when an unknown file may be vertical, social, or Shorts cover artwork. | Open route |
| YouTube Banner Safe Area | Submitted and indexed in the August 1 P0 URL Inspection run. Use it when a wide file may need safe-area, banner, or header routing. | Open route |
| Social Media Image Checker | Still unknown to Google in the latest August 1 P0 URL Inspection run. Route broad social, creator, poster, Linktree, and marketplace files from this generic checker into the social checker so indexed pages and the public P0 queue can expose it. | Open route |
| Open Graph Preview Checker | Discovered - currently not indexed in the latest August 1 P0 URL Inspection run. Route website share-card files from this generic checker into the Open Graph preview workflow while Google evaluates the checker page. | Open route |
P0 Image Size Checker differentiation case
Search Console still reports this canonical Image Size Checker URL as unknown in the latest August 1 P0 URL Inspection run. To make the page easier to discover and classify, this section separates the file-reading tool from the legacy redirect, static platform guides, and deployed-page preview checks.
| Differentiation point | Why this page is distinct | Indexing action |
|---|---|---|
| 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 |
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.
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.