API TOOL CALLS

Image resizer

Free to use, with no sign up. Everything runs in your browser and nothing is uploaded.

With the lock on, the last width or height you edit sets the size; the other dimension follows each image’s own ratio.

Drag the divider or use the arrow keys to compare your first image with its resized copy; Zoom to 1:1 shows real pixels.

How to use this tool

Choose images, set dimensions or a percentage, then resize and save each result.

Frequently asked questions

Do my files leave my device?

No. Each file never leaves the device. This tool reads and processes files entirely in your browser, with nothing uploaded or stored by API Tool Calls.

How does the aspect lock work?

The last width or height you edit sets that dimension. The other follows the original image’s ratio, separately for each image. Turn off the lock to set both dimensions, or choose a percentage.

Will the image stay sharp and keep its format?

Large reductions use repeated half-size draws followed by a final resize. JPG, PNG and WebP keep their format when your browser supports it; other formats become PNG. Animated images become a single still frame.