Resize Image — Free Online Tool
Use instantly, free, with no signup. Your files are processed locally and never uploaded.
By the AllFileBox Team · Last updated: 2026-06-21
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Free: up to 10MB • Pro: 100MB • Business: 500MB
Resize Image is a free online tool that scales JPG, PNG, and WebP photos to exact pixel dimensions in your browser, with an option to lock the aspect ratio so images never look stretched.
Why resize an image
Platforms and layouts expect specific dimensions, and an oversized image wastes bandwidth while an undersized one looks blurry when stretched. Resizing sets the exact width and height you need, whether that is a 1080-pixel social post, a 150-pixel avatar, or a banner that fits a template. It also shrinks file size, which speeds up uploads and page loads.
Aspect ratio and distortion
Locking the aspect ratio keeps the original proportions, so changing the width updates the height automatically and the picture never looks squashed. Unlocking it lets you force exact dimensions when a layout demands them, at the risk of stretching. For most jobs you keep the ratio locked and crop separately if you need a different shape.
Scaling up versus down
Scaling down is safe because you are discarding pixels, so the smaller image stays sharp. Scaling up invents pixels that were never captured, so an enlarged image looks softer the more you stretch it. For best quality, start from the largest original you have and resize downward to the size you need rather than upscaling.
Private, browser-based
Resize Image runs in your browser. The photo is drawn to a canvas at the new dimensions and returned as a download. Nothing is uploaded or stored, so your images never leave your device. Resizing a typical photo completes in well under a second.
How To Use Resize Image
- Open the Resize Image tool and add your photo.
- Enter the target width or height in pixels.
- Keep the aspect ratio locked to avoid stretching.
- Apply the resize in your browser.
- Download the resized image.
Fit a social post
Fit a social post
Resize a photo to the exact pixel size a platform recommends so it uploads without being re-cropped.
Make an avatar
Scale a picture down to a small square dimension for a clean profile image.
Lighten a web image
Reduce an oversized photo to the display size your page needs so it loads faster.
| Use | Typical size | Note |
|---|---|---|
| Profile avatar | 150 x 150 | Square, scale down |
| Social post | 1080 x 1080 | Keep ratio |
| Web banner | Template size | Crop if needed |
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Key Features Resize Image
Your Files Stay Private
All processing happens in your browser using WebAssembly. Your file is never sent to our servers. We have zero access to your files — guaranteed.