Image Resizer Image
Resize any image to exact pixels or a percentage, keeping it sharp.
Image Resizer is a free online tool that resize any image to exact pixels or a percentage, keeping it sharp. It accepts JPG, PNG, WEBP, GIF, BMP, AVIF and SVG — anything your browser can display. It produces pNG by default.. It runs entirely in your web browser using Canvas 2D, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Image
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Input
- JPG, PNG, WEBP, GIF, BMP, AVIF and SVG
- Output
- PNG by default
- Technology
- Canvas 2D
- Settings
- 5
- Works offline
- Yes, after the first visit
About Image Resizer
Resizing is the most-used image tool on the web, usually because something else imposed a limit — an upload cap, a profile picture box, a print size. Everything here happens on a canvas in your browser, so even large photos never leave your device.
How to use it
- Choose an image, or drag one onto the drop zone.
- Set resize by, width and height and the remaining options.
- Check the preview, then download. Your original file is never modified.
The 5 settings
| Setting | What it does | Default |
|---|---|---|
| Resize by | Choose from 3: Exact pixels, Percentage, Fit inside a box. | Exact pixels |
| Width | Range 1–20000. | 1200 |
| Height | Range 1–20000. | 1200 |
| Scale | Range 1–400%. | 50% |
| Keep aspect ratio | On or off. On by default. | On |
Under the hood
| Runs on | Canvas 2D — does the pixel work |
| Accepts | JPG, PNG, WEBP, GIF, BMP, AVIF and SVG — anything your browser can display |
| Produces | PNG by default |
| Controls | Resize by, Width, Height, Scale, Keep aspect ratio |
Questions
Will resizing make my image blurry?
Making an image smaller is essentially lossless in appearance. Making it larger cannot invent detail that was never captured — beyond about 200% you will see softness. Sharpen Image afterwards recovers some apparent crispness.
What does "keep aspect ratio" actually do?
It fits your image inside the width and height you gave, rather than stretching it to match both exactly. With it off, a 4:3 photo forced into a square will look squashed.
What size should I use for a website?
Match the largest size the image is actually displayed at, then double it for high-density screens. A full-width hero rarely needs more than 2400px; a thumbnail rarely more than 600px.
Does resizing reduce the file size?
Substantially — file size scales roughly with pixel count, so halving both dimensions cuts it to about a quarter. Combine with Image Compressor for the biggest saving.