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
How to use the Image Resizer
Add an image
Drop an image onto the upload area. Its current dimensions are read and filled in for you.
Choose pixels or percentage
Pixels when you have a specific target to hit. Percentage when you just want it smaller by some proportion.
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.
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
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.