Image Resizer
Resize images to exact dimensions or percentages — processed in your browser.
Free · No sign-up · Runs locally in your browser · Also available in Chinese (中文)
What is Image Resizer?
An image resizer changes an image's pixel dimensions while keeping the subject looking right. You can target an exact width and height, scale by a percentage, or fit within a maximum size while preserving the aspect ratio so nothing stretches.
Resizing happens with your browser's canvas engine on your own device: photos of people, screenshots and documents are never uploaded. The tool also lets you choose the output format and quality, which makes it a practical first step before uploading images to a CMS that enforces size limits.
How to use it
- 1Drag an image onto the page or pick a file.
- 2Enter target dimensions, or pick a percentage scale, or set only one side to keep the ratio.
- 3Choose the output format — keep the original, or export as JPEG/PNG/WebP.
- 4Download the resized image.
Common use cases
- Shrinking camera photos from 4000px to 1200px for a website or blog post.
- Producing exact-size app icons and avatar crops from one source image.
- Batch-preparing product images to a marketplace's required dimensions.
Frequently asked questions
▸Will resizing reduce image quality?
Downscaling usually looks clean; upscaling beyond the original size adds softness because missing pixels must be invented. For quality-critical work, resize down, not up.
▸What format should I choose for the web?
WebP or JPEG for photos (much smaller files), PNG when you need transparency or sharp text-like edges.