Free · In your browser · No upload
Resize an image
Set exact pixel dimensions with the aspect ratio locked, or scale by 25%, 50%, or 75% in one click.
Many images to do? Try resize images in bulk.
Need more than one operation? Open the full editor to combine tools and reorder your edits.
Resizing is usually the biggest single lever on file size. Because a picture’s byte count roughly tracks its pixel count, halving an image’s width quarters the number of pixels — and typically the file size along with it. That is a far larger effect than anything a quality slider will do for you.
How the shrinking is done matters too. This tool uses Lanczos resampling via the pica library rather than the browser’s built-in scaler. When we measured both against the mathematically exact result, Lanczos was between 24% and 60% more accurate on photographs, because the default scaler skips information and turns fine repeating detail into shimmer.
How it works
- 1
Load an image by dropping it here, browsing for it, or pasting from your clipboard.
- 2
Type a new width or height. With the aspect lock on, the other dimension follows automatically so nothing gets stretched — turn the lock off only when you genuinely want to distort the image.
- 3
For a quick reduction, use the 25%, 50%, or 75% presets instead of typing dimensions.
- 4
Click Apply resize, check the new dimensions in the info panel, and download.
Frequently asked questions
Will my resized image look blurry?
Downscaled images should stay crisp: this tool uses Lanczos resampling, the same class of filter professional editors use, which we measured as substantially more accurate than the browser default. Enlarging is a different story — going beyond the original size always softens, because the extra pixels have to be invented rather than recovered.
What size should I resize to for a website?
Work out the widest the image is ever displayed, then double it for high-density screens. An image in a 700-pixel article column wants to be about 1400 pixels wide; a full-width hero around 2400. Supplying more than that means visitors download detail their screen cannot show.
Should I resize before or after compressing?
Resize first. Compressing at full size and then shrinking wastes the effort — you carefully encoded detail that is about to be discarded. Resizing first also makes the quality setting meaningful, because it then applies to the image at the size people actually see it.
Can I resize without keeping the aspect ratio?
Yes — switch the aspect lock off and set width and height independently. Be aware that stretching is far more noticeable than any resampling artefact, particularly on faces and text, so it is usually better to crop to the shape you want and then resize.
Does the resizing happen on your servers?
No. The Lanczos filter runs in your browser through a web worker, so a large image does not freeze the page while it processes. Your file stays on your device throughout, which also means there is no upload limit beyond what your own machine can hold in memory.