Image Size Checker
Check image dimensions, file size, aspect ratio and social media fit instantly.
Drop images here or click to upload
Supports JPG, PNG, WebP, GIF — multiple files allowed
Standard Image Sizes Reference
| Platform | Size | Ratio |
|---|---|---|
| Facebook Cover | 1640×856 | 1.91:1 |
| Instagram Square | 1080×1080 | 1:1 |
| Instagram Story | 1080×1920 | 9:16 |
| YouTube Thumbnail | 1280×720 | 16:9 |
| Twitter Header | 1500×500 | 3:1 |
| LinkedIn Banner | 1584×396 | 4:1 |
| WhatsApp DP | 500×500 | 1:1 |
Many upload forms — passport photo portals, job application systems, website content fields — reject a file outside a specific pixel size or file size range, and they often do it without a clear error message, leaving you guessing what actually went wrong.
This tool reads an image's exact width, height, file size, and format the moment you upload it, so you can confirm whether it meets a requirement before submitting it anywhere, rather than finding out after a rejected upload.
All of this information comes from the file's own metadata and pixel data, read locally in your browser — there's no need to upload the image to a separate service just to check its dimensions.
It helps to understand where the numbers this tool reports actually come from. Pixel dimensions come directly from the image file's header data, which every image format stores regardless of compression. File size is simply the size of the file on disk. Neither number can be faked or approximated — they're read exactly as the operating system and browser see them, which is why this check is a reliable pre-flight step before any upload.
A less obvious use for this tool: comparing dimensions and file size before and after running an image through a different tool (like a compressor or resizer) confirms that tool actually did what it claimed, rather than trusting the result blindly.
It's also worth building the habit of checking dimensions immediately after taking a screenshot on a high-DPI display, since these often capture at a much higher pixel density than what appears on screen — a screenshot that looks like a small icon on your display can actually be several times larger in actual pixel dimensions than expected.
Step-by-step instructions
- 1
Upload the image
Select or drag the file you want to check.
- 2
View the dimensions
Exact width and height in pixels appear instantly.
- 3
Check the file size
File size in KB or MB is shown alongside the format.
- 4
Compare against your requirement
Confirm the numbers match whatever form or spec you're submitting to.
Common use cases
Verifying document photo specs
Confirm a photo matches a required pixel size before uploading it to a government or exam portal.
Checking website image assets
Verify an image's actual dimensions and file size before adding it to a page.
Debugging upload rejections
Diagnose exactly why a form rejected a file by checking its real specifications.
Quality control before delivery
Confirm final exported assets meet a client's specified dimensions before sending them over.
Auditing a website's existing images
Check whether images already live on a website are unnecessarily large before deciding which ones are worth optimizing first.
Tips for best results
- Check both pixel dimensions and file size — some forms restrict one, some restrict both, and some restrict neither exactly as you'd expect.
- If a file is too large, use a compressor or resizer first, then re-check here before re-uploading.
- File size and pixel dimensions are independent — two images with the same dimensions can have very different file sizes depending on compression.
- Screenshots taken on high-DPI displays are often larger in pixels than they appear on screen; always verify actual dimensions.
- Use this tool right after running an image through a compressor or resizer to confirm the output actually matches what you expected.
- If a form's error message is vague, checking exact dimensions and file size here is often faster than guessing what specifically went wrong.
Frequently asked questions
Does this tool upload my image to check it?
No, the dimensions and file details are read locally in your browser using the file's metadata.
What's the difference between file size and pixel dimensions?
File size (KB/MB) is how much storage the file takes up, while pixel dimensions describe the image's resolution.
Can I check multiple images at once?
This tool checks one image at a time to keep the results clear and immediate.
Does it show the image's color format too?
Yes, the file format (JPG, PNG, etc.) is shown alongside the dimensions and size.
Can this tool be tricked by a renamed file extension?
No, the dimensions and format are read from the actual file data and headers, not from the filename, so a mismatched extension is detected accurately.
Is this useful for verifying another tool's output?
Yes — checking dimensions and file size after using a compressor or resizer confirms that tool's result actually matches what you expected.
Why do my screenshots have unexpectedly large pixel dimensions?
High-DPI displays often capture screenshots at a much higher pixel density than what appears on screen, so a small-looking screenshot can actually be several times larger in actual pixel dimensions than expected.