Image Resizer
Resize images to exact pixel dimensions with locked aspect ratio.
Source image
Drop a file here
or choose a file — it never leaves your device
Resized result
Upload an image, set dimensions, and click Resize.
About the Image Resizer
Resize any image to custom width and height, with an option to lock the aspect ratio so proportions stay correct. Preview and download the resized image instantly, fully client-side.
Examples
Downscale
4000×3000Output
1200×900Related tools
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Frequently asked questions
Read more
- Compressing and converting images without uploading them
How Canvas-based compression works, when WebP wins, and how to keep quality while cutting page weight.
- Image optimization for the web: formats, compression and sizing
A practical framework for picking a format, a resolution and a compression level so images stop being the heaviest part of the page.
- Choosing image formats: WebP vs AVIF vs PNG vs JPEG
A practical decision guide for picking the right image format based on content type, browser support and file size.
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser