Image Resizer
Resize any image to exact pixel dimensions or a percentage scale. Preserves aspect ratio, supports PNG, JPG, WebP and GIF. No upload — runs entirely in your browser.
Drop image here or
PNG, JPG, WebP, GIF · processed locally
What is Image Resizer?
Resizing images for the web reduces page load times, improves Core Web Vitals scores, and ensures your content displays correctly across devices. Uploading a 4000×3000 camera photo when you only need 800×600 wastes bandwidth for every visitor.
This tool resizes images entirely in your browser using the HTML5 Canvas API — your files are never uploaded to any server. It supports PNG, JPG, WebP, and GIF files, and lets you lock the aspect ratio so your image never stretches.
You can resize by exact pixel dimensions, or scale by a percentage. The output can be downloaded as PNG, JPG, or WebP at any quality level.
How to use
Frequently asked questions
No. Everything happens in your browser using the Canvas API. Your image never leaves your device.
Only the first frame is processed. Full animated GIF resizing requires server-side processing.
There is no hard limit imposed by this tool, but very large images (40MP+) may be slow depending on your browser's memory.
PNG for images with transparency or sharp edges (logos, screenshots). JPG or WebP for photos. WebP gives the best compression for equivalent quality.