Back to tools

Image Size Finder

Find the pixel dimensions of any image. Width, height, aspect ratio, and file size. Drop a file or paste a URL. Runs in your browser. Files never leave your machine.

Drop an image or click to upload

PNG, JPG, GIF, WebP, AVIF, SVG. Anything your browser renders

Must be served with permissive CORS for cross-origin URLs.

How It Works

  1. 1

    Drop an image or paste a URL

    Files stay in your browser; URLs load via your browser, not our servers.

  2. 2

    Dimensions read instantly

    Width, height, aspect ratio, and (for uploads) file size and type.

  3. 3

    Use the numbers

    Confirm asset specs for design, build a responsive `sizes` attribute, or verify a generated thumbnail.

Use Cases

  • Design hand-off QA

    Confirm a delivered asset matches the spec before committing it.

  • Responsive image audit

    Check that thumbnails, OG images, and srcset entries match their declared dimensions.

  • Visual regression debugging

    Verify image dimensions when a Percy or Chromatic snapshot diffs unexpectedly.

  • CDN transformation check

    Measure the output of a Cloudflare or Imgix transform to confirm width/height parameters.

Frequently Asked Questions

It reports the pixel dimensions of any image, width, height, aspect ratio, plus file size and MIME type when you upload locally. Drag and drop, click to upload, or paste a URL.
Anything the browser can render: PNG, JPG, GIF, WebP, AVIF, BMP, ICO, and SVG. For SVG without intrinsic dimensions, the reported size is the rendered size.
The image's server must send permissive CORS headers (`Access-Control-Allow-Origin: *`) for cross-origin loads. If it doesn't, the browser blocks reading. Download the image and upload it directly instead.
No. For local uploads, the file is read into a base64 data URL and rendered in the browser. URL loads happen directly between your browser and the image's host. Nothing routes through us.
Simplified to its lowest terms using the greatest common divisor. A 1920×1080 image shows as 16:9; 800×600 as 4:3; 1600×996 as 400:249 (which is close to the golden ratio).
Not in the current build. Drop one image at a time. If batch measurement would help your workflow, let us know at support@bug0.com.

Done generating test data? Now automate the tests.

Bug0's expert AI agents write end-to-end tests from plain English, auto-heal them when your UI changes, and run them on every deploy. A forward-deployed engineer verifies every result.

From $2,500/mo. Results in 7 days.

Go on vacation. Bug0 never sleeps. - Your AI QA engineer runs 24/7

Go on vacation.
Bug0 never sleeps.

Your AI QA engineer runs 24/7 — on every commit, every deploy, every schedule. Full coverage while you're off the grid.