ImageSizeChecker
100% client-side · no upload, ever

Check 100 images against platform specs in one drop.

Get width, height, aspect ratio and file size for every file, plus an instant pass/fail verdict against 8 official platform presets. Everything runs in your browser, so your images never leave your device.

No images yet — drop some above.

How it works

Drop

Drag in up to 100 images: PNG, JPG, WEBP, GIF or SVG. Files are read straight from your device, never uploaded.

Inspect

Width, height, aspect ratio and file size appear row by row, parsed from each file's header in milliseconds.

Verify

Pick a platform preset or set your own limits. Every image gets an instant pass or fail verdict, with the reason.

A quick guide to batch checking

Read the results table

Each row shows a thumbnail, file name, exact pixel dimensions, simplified aspect ratio, file size and format. Click any column header to sort; one click on Size pushes the largest files to the top. Dimensions come from header-level parsing, so even a 4K photo reads in milliseconds.

Check against a spec

Choose one of 8 platform presets covering Instagram, Pinterest, YouTube, Amazon, Shopify and more, or enter your own maximum width, file size or required aspect ratio. An image passes only when every rule is satisfied. When it fails, the reason tells you whether to crop, resize or compress.

Export and move on

Download the full result set as a CSV, or copy it to your clipboard for a spreadsheet or hand-off note. Remove single rows as you fix files, or clear the batch and start over. Nothing is kept once you leave the page.

Built for the specs you ship to

Social media & content teams

Feed posts, pins and link cards each demand a different size and ratio. Verify a whole campaign folder against Instagram, Pinterest, Open Graph and X presets before anything goes live, so covers stay uncropped and link previews stay sharp.

E-commerce sellers

Amazon requires at least 1000 px on the longest side to enable zoom. Shopify recommends 2048×2048 squares under 20 MB. Check an entire product shoot in one drop and catch the rejects before your listings do.

Video creators

A 16:9 thumbnail at the right resolution is the difference between crisp and muddy in the feed. Confirm every frame you export clears the YouTube bar before you upload it.

Frequently asked questions

Are my images uploaded anywhere?

No. All processing happens locally in your browser, and your images never leave your device. Open the network panel in your browser's developer tools. You will see zero image-related requests.

Which formats are supported?

PNG, JPG, WEBP, GIF and SVG. Dimensions are read from file headers for speed and accuracy; SVG files are parsed from their viewBox markup.

Is there a limit on batch or file size?

Up to 100 images per batch and 50 MB per file. If you drop more than 100, the first 100 are processed and the rest are skipped with a note.

How does the pass/fail check work?

Pick a platform preset or define your own rule: maximum width, maximum file size, or an aspect ratio like 16:9. An image passes only when every condition holds. Ratios are compared with a 1% tolerance, so 1920×1080 and 1280×720 both count as 16:9.

Which platform presets are included?

Instagram feed square and portrait, Open Graph link-share images, X summary cards, YouTube thumbnails, Amazon product main images, Shopify product images and Pinterest standard pins. Every preset's limits are verified against the platform's official documentation.

Do you keep my results or history?

No. The tool stores nothing. Refreshing or closing the page clears everything.

Can I export the results?

Yes. Download the table as a CSV file or copy it to your clipboard. The export includes file names, dimensions, aspect ratios, file sizes, formats and pass/fail verdicts.