Image Resize
Resize images freely in pixels. Supports JPG, PNG, WebP, GIF.
Supports JPG, PNG, WebP, GIF, BMP
Drag or click to select image
JPG, PNG, WebP, GIF, BMP · Max 50MB
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About Image Resize
Resize images to exact dimensions or by percentage, directly in your browser. Supports JPEG, PNG, WebP, and GIF formats. No server upload needed.
How to Resize an Image
- 1Upload the image file you want to resize.
- 2Enter the target width or height in pixels. Aspect ratio is locked by default.
- 3Click Resize to process the image.
- 4Download the resized image to your device.
Popular Use Cases
Meet exact upload dimensions
Forums, marketplaces, and ID-photo systems often require a precise pixel size such as 600×600. Resize to the exact spec in seconds.
Speed up your website
Serving a 4000px photo where only 800px is shown wastes bandwidth. Resize to display size for faster loads and better Core Web Vitals.
Shrink for email and chat
Large camera images are slow to send. Reduce their dimensions so they attach and open quickly in messengers and mail.
Fit social media formats
Resize to the recommended dimensions for profile pictures, thumbnails, or banner images without cropping by hand.
Why FileZoom
No upload — images stay private
Resizing runs entirely in your browser, so personal photos never leave your device.
Free with no limits
Resize as many images as you like — no account, no watermark, no daily quota.
Precise aspect-ratio control
Keep the ratio locked to avoid stretching, or unlock it to set width and height independently for exact-size requirements.
Works on any device
Runs in any modern browser on Windows, Mac, Android, or iPhone — nothing to install.
Formats & Features
| Supported formats | JPEG, PNG, WebP, and GIF. |
|---|---|
| Resize modes | By exact pixel width/height, or by percentage of the original. |
| Output | Same format as the input file. |
| Aspect ratio | Locked by default; unlock to set width and height independently. |
| Quality | Downscaling preserves quality well; upscaling beyond the original may blur. |
| Processing | 100% in your browser via the Canvas API. No upload. |
How It Works
FileZoom draws your image onto an in-memory canvas at the target dimensions using the browser's Canvas API, then re-encodes it in the same format. Because the scaling and encoding both run on your device, the image is never uploaded and the original file on disk is left untouched.
Tips & Best Practices
- Keep the aspect ratio locked and enter only width OR height — the other value is calculated automatically, so nothing stretches.
- Downscale rather than upscale. Enlarging beyond the original size adds blur, not detail.
- Resizing reduces dimensions but not always file size to the minimum — run the result through Image Compress for the smallest file.
- For an exact-size upload like 600×600, unlock the ratio and set both width and height.
FAQ
Will resizing reduce image quality?
Downscaling generally preserves quality well. Upscaling may introduce blurriness.
Is the aspect ratio preserved?
Yes, by default. You can unlock the aspect ratio to set width and height independently.
Are my images uploaded anywhere?
No. Resizing uses the browser Canvas API. Your images never leave your device.
What image formats are supported?
JPEG, PNG, WebP, and GIF are supported. The output format matches the input format.
What is the difference between resizing and compressing?
Resizing changes the pixel dimensions (width × height); compressing reduces file size at the same dimensions. Use both together for small, correctly sized images.
Can I resize by percentage instead of pixels?
Yes. You can scale by a percentage of the original or enter exact pixel dimensions — whichever fits your target better.
Will resizing reduce the file size?
Usually yes, since fewer pixels mean less data. For the smallest possible file, run the resized image through Image Compress as well.
Does Image Resize work on mobile?
Yes. It runs in mobile browsers such as Safari and Chrome, so you can resize directly on your phone or tablet.