Two ways to set the size
- By percentage scales the width and height together, for example 50% turns a 4000 × 3000 photo into 2000 × 1500. This is the quickest way to shrink a batch of photos from the same camera.
- Exact pixels sets a specific width, height or both. With “Keep proportions” on, a width of 1200 turns a 4000 × 3000 photo into 1200 × 900. With it off, the image is stretched to exactly the size you enter.
Why resizing matters
The number of pixels has more effect on file size than any other setting. Halving the width and height leaves a quarter of the pixels, so the file is typically around a quarter of the size. Common reasons to resize:
- Websites. Images should be close to the size they are displayed at, or up to twice that for high-resolution screens. A 1200-pixel-wide image covers most blog layouts.
- Email and chat. 1600–2000 pixels on the long side looks sharp on any phone while cutting file size dramatically.
- Forms and profiles. Many sites require an exact size such as 600 × 600 for a photo or 400 × 400 for a profile picture.
- Print. Here you may need more pixels, not fewer. See the guide on image size and resolution.
How the resizing works
Each image is decoded, resampled with the Lanczos3 filter, the same method used by professional image software, and saved again in its own format. Resampling is done in linear light with premultiplied alpha, which avoids dark fringes around transparent edges and keeps colours accurate. JPG and WebP results are saved at 90% quality.
After resizing
To make files even smaller, run the results through the image compressor. If you need to meet a file size limit in KB as well as pixel dimensions, resize first, then use the compress to a size tool.
Questions
Will resizing make my image blurry?
Making an image smaller keeps it sharp; this tool uses Lanczos resampling, which preserves fine detail better than basic scaling. Making an image larger can't add detail that wasn't captured, so big enlargements look soft.
How do I keep the proportions?
Leave "Keep proportions" ticked and enter just a width or just a height. If you enter both, the image is fitted inside that box without stretching.
Can I resize many images to the same size?
Yes. Set the size once, then select or drop all your images. Each is resized with the same settings, and you can download them together as a ZIP.
Does resizing change the file format?
No. JPG, PNG and WebP images keep their format. AVIF, BMP and GIF images are saved as PNG, which every app can open.
Last reviewed 30 October 2026