Resize Image Online Free
Resize images online for free and change pixel dimensions in seconds. Reduce image size for the web or match social media sizes — all in your browser, no upload.
Resizing changes an image’s width and height in pixels. It is the single most effective way to speed up a website, because fewer pixels means a smaller file and faster paint. You can resize by percentage or to exact dimensions while keeping the aspect ratio locked.
Resize JPG and PNG
Both JPG and PNG resize the same way — the dimensions change, the format stays. Resize first, then compress, to get the smallest possible file for the web.
Reduce Image Dimensions
- Scale by percentage (e.g. 50%) to halve dimensions.
- Set exact width/height for templates and banners.
- Lock aspect ratio to avoid distortion.
- Pair with compression for maximum savings.
Social Media Image Sizes
| Use | Size (px) |
|---|---|
| Profile photo | 400 × 400 |
| Square post | 1080 × 1080 |
| Share link preview | 1200 × 630 |
| Cover photo | 1500 × 500 |
| Story / Reel | 1080 × 1920 |
Resize then compress
Resizing cuts pixels; compression cuts bytes. Doing both gives the smallest, fastest-loading image for any platform.
Resize in Your Browser
- Open the image resizer below.
- Add your image (processed locally, no upload).
- Enter target dimensions or a percentage.
- Download the resized image instantly.
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Frequently Asked Questions
What does resizing an image do?
Resizing changes the pixel dimensions (width and height) of an image. Smaller dimensions mean fewer pixels to load, which reduces both display size and file weight.
What image size is best for social media?
Common sizes: profile photos 400×400, posts 1080×1080 (square) or 1200×630 (share link), cover 1500×500, and stories 1080×1920. Match the platform to avoid cropping.
Does resizing reduce file size?
Yes. Fewer pixels means a smaller file. Combining resize with compression gives the biggest savings for web performance.