Image resizer
Choose a picture, enter the new width or height, or scale it by a percentage, and download the result. Resizing happens in your browser and the file is not uploaded.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose or drop a picture. Its original size appears.
- Select Pixels and type a width or a height, or select Percent and type a scale.
- Pick the output format and download.
How the size is calculated
With Keep aspect ratio on, the side you did not edit is computed from the original proportions and rounded to a whole pixel. For example, a 4000 × 3000 photo resized to 1000 pixels wide becomes 1000 × 750. In percent mode both sides are multiplied by the percentage: 50% of 800 × 600 is 400 × 300.
Tips
- Resize first, then compress: smaller dimensions already cut the file size a lot.
- For social media and e-mail, 1200–2000 pixels on the long side is plenty.
- If you only need a part of the picture, use the image cropper.
Frequently asked questions
Does resizing reduce quality?
Making a picture smaller keeps it sharp. Enlarging cannot add detail that is not there, so a big enlargement looks soft. The browser uses high-quality smoothing in both cases.
What does keep aspect ratio do?
When it is on, changing the width sets the height to match, and the other way round, so the picture is not stretched. Turn it off to set both sides freely.
What is the largest size I can make?
Each side is limited to 16,384 pixels. Very large results need a lot of memory and may fail on phones.
Is my image uploaded?
No. The picture is drawn to a canvas of the new size inside your browser and saved from there.
Which output format should I pick?
JPG for photos, PNG when you need transparency or sharp edges, WebP for small files on modern browsers. JPG fills transparent areas with white.