How to resize an image by pixels, percent or file size
Quick answer
To resize an image, drop it into the Resize images tool, type a width or height in pixels or choose a percentage, and press Resize. Leave one box empty and the other is worked out so the picture is not stretched.
Steps
- Open the Resize images tool and drop in your JPG, PNG or WebP files.
- Type a width, a height, or a percentage. Leave one box empty to keep the proportions.
- If a form needs a file size, type a target in KB, for example 100.
- Press Resize and download the result, or all files as a ZIP.
Pixels, percent or kilobytes?
Pixels are for places that ask for a size such as 1200 by 800. A percentage is quicker when you just want it smaller, for example 50 percent. A target in KB is for upload limits, and the tool finds the best quality that fits.
The target size works for JPG and WebP. A PNG with a target size is saved as WebP, because PNG is lossless and cannot trade quality for size.
When the target is too small
If the size you ask for cannot be reached at the pixel size you chose, you see a message instead of a wrong file. Try fewer pixels, then try the target again.
Making a picture bigger does not add detail. It is enlarged, so it can look soft, which is why shrinking is the safe direction.
Common questions
How do I resize without stretching the picture?
Fill in only the width or only the height. The other side is calculated from the original proportions.
Can I resize to exactly 100 KB?
Yes. Type 100 as the target size. The tool picks the highest quality that fits under it, or tells you if it cannot.
Does resizing upload my photo?
No. It runs in your browser and the file stays on your device.
Written by Basic App Company. Last checked against the tool on 12 November 2026. The tool runs in your browser, so your pictures are not uploaded.