Image Resizer
Resize a picture to exact pixel dimensions or by percentage, with the aspect ratio locked by default so nothing gets squashed.
How to use Image Resizer
- Choose an image — JPG, PNG, WebP and GIF are all accepted.
- Enter a new width or height, or drag the percentage slider.
- Unlock the aspect ratio only if you deliberately want to distort the image.
- Pick an output format, check the preview and download.
About this tool
Most images on the web are far larger than they need to be. A photo straight off a phone is typically 4000 pixels wide, while the space it occupies on a web page might be 800. Serving the full-size file wastes bandwidth and slows the page down for no visible benefit.
Shrinking is safe; enlarging is not. Making an image smaller discards information, and the result looks clean. Making it larger invents pixels that were never captured, and the result looks soft no matter which algorithm does it. If you need a bigger version, go back to the original file.
Output format matters as much as dimensions. JPG suits photographs, PNG suits screenshots, logos and anything needing transparency, and WebP usually beats both by a comfortable margin and is supported by every current browser. Converting a photo from PNG to JPG or WebP often cuts the file size by 80% or more on its own.
Frequently asked questions
What size should I use for a website?
Measure the space the image fills, then supply roughly twice that in pixels so it stays sharp on high-density screens. A full-width banner is usually fine at 1600–2000 pixels wide; a thumbnail rarely needs more than 600.
Why did my PNG get bigger after resizing?
PNG is lossless, and re-encoding a photographic image as PNG can produce a larger file than the compressed original you started with — particularly if the source was a JPG. For photographs, choose JPG or WebP as the output format.
Does resizing remove EXIF data?
Yes. Because the image is redrawn onto a canvas, metadata such as GPS coordinates, camera model and capture time is not carried into the output. That is usually welcome before posting a photo publicly, but it does mean the original is the only copy that still holds those details.
What does locking the aspect ratio do?
It keeps width and height in their original proportion, so editing one automatically updates the other. Unlocking lets you set both independently, which will stretch or squash the picture — occasionally useful, usually not what you want.