Image Resizer

Batch-resize images by pixels or percentage, with aspect ratio locked.

Drag & drop images here
or click to choose files — you can also paste from clipboard

Whether you are preparing photos for a website header, shrinking screenshots for documentation, or meeting an avatar upload requirement, resizing is the most common image operation there is. This resizer handles one image or a hundred with the same two clicks.

Enter exact dimensions in pixels, or scale by percentage — for example 50% to halve a photo. Aspect ratio stays locked by default so nothing gets stretched; unlock it deliberately if you need a non-proportional fit. An optional max-width cap is handy for taming oversized camera originals in bulk.

Everything runs locally in your browser using the Canvas API. Your images are read from disk, resized in memory, and written straight back to your downloads folder — no server round-trip, no queue, no waiting behind other users.

How to use

  1. Drop your images into the area above.
  2. Choose a mode: exact width & height in pixels, or a percentage scale.
  3. Keep "lock aspect ratio" enabled unless you intentionally want distortion.
  4. Optionally set an output format, press Resize, and download the results.

Why use this tool?

Frequently Asked Questions

Will resizing reduce image quality?
Downscaling with the browser’s smooth interpolation looks excellent in practice — far better than naive pixel dropping. Enlarging is different: making an image bigger cannot invent detail, so enlarged images look soft. Avoid upscaling when you can.
What size should I use for the web?
Match the largest size the image is actually displayed at, times two for high-DPI screens. A blog content image rarely needs to be wider than 1200–1600 px. Huge 4000 px camera photos waste bandwidth and slow down your pages.
Can I resize without changing the format?
Yes — leave the format option on “keep original” and each file is written back in its own format (PNG stays PNG, JPEG stays JPEG).
Is there a file count limit?
No hard limit. Everything is limited only by your device’s memory, and a few hundred typical photos process without issue on a normal laptop.