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Image Resizer

Change an image's dimensions — to fit an upload limit, a layout, or a profile picture. Work in pixels or in percent, and the aspect ratio stays locked unless you deliberately unlock it.

Image Resizer tool

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How to use the Image Resizer

  1. Add an image

    Drop an image onto the upload area. Its current dimensions are read and filled in for you.

  2. Choose pixels or percentage

    Pixels when you have a specific target to hit. Percentage when you just want it smaller by some proportion.

  3. Enter the new size

    With the aspect ratio locked, filling in either width or height calculates the other automatically, so the image cannot come out stretched.

  4. Resize and download

    Press Resize and download the result.

Where your files are processed

Your files are processed locally in your browser and are not uploaded to our servers.

The Image Resizer runs as JavaScript on the page you are reading. When you choose a file, the browser hands it to that code directly — it is never put into a network request, so there is no upload to cancel, no copy sitting in a queue somewhere, and nothing for us to delete afterwards. We could not see your file if we wanted to.

You can verify this rather than take our word for it: open your browser’s developer tools, switch to the Network tab, and run the tool. You will see no request carrying your file. Better still, once the page has loaded you can disconnect from the internet entirely and the Image Resizer will keep working — which it could not do if it depended on a server.

To be exact about what doesleave the page: like the rest of this site, it loads analytics, which record that a tool was opened and whether it succeeded. Those events carry the tool’s name and a duration — never a file, a file name, or anything read out of your file. The tool panel above is also excluded from session recording, so nothing shown inside it is captured either.

Frequently asked questions

Making an image smaller is safe and usually looks sharp. Making it larger cannot add detail that was never captured, so an upscaled image always looks softer than a photo taken at that size. The tool uses high-quality smoothing, but no amount of it invents missing information.

It keeps the original proportions. Enter a width and the height follows automatically. Unlock it only when you genuinely want to distort the image — otherwise people come out stretched.

The image is scaled to fit inside the box you described, keeping its shape. The result will match one of your two numbers and come in under the other.

Yes, usually substantially — fewer pixels means less data. If your goal is purely a smaller file rather than specific dimensions, the Image Compressor gives you finer control over the trade-off.

Keep exploring

Credits

The file-processing behind this tool is adapted from DoxDock by Mithun Srinivas, used under the MIT Licence. Rebuilt here in TypeScript for this site.

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