Resize any image by width, height or percentage, keeping the aspect ratio. Done locally, nothing leaves your device.
Leave width or height empty to keep the aspect ratio. Percentage overrides explicit dimensions.
How to resize an image
Choose a file, then set a target width, height, or a percentage scale. Leave one dimension blank to keep the aspect ratio automatically. Press Download resized image.
Tips
Use percentage when you just want “half size” or “double size”. Use explicit pixels when you need an exact dimension, for example a 1200×630 social share image or a 512×512 thumbnail.
Frequently asked questions
Will resizing make a photo blurry?
Shrinking is sharp; enlarging beyond the original size adds no real detail and can look soft. Keep enlargements modest.
Is anything uploaded?
No. The resize happens on a canvas in your browser; the photo never leaves your device.
Which format should I pick?
JPG for photos, PNG for graphics with text or transparency, WebP for the smallest files where supported.
How to use it
- Select an image file from your device. The tool reads the original dimensions immediately.
- Enter a target width in pixels, a target height in pixels, or a percentage scale. Leave one dimension blank to let the tool keep the aspect ratio automatically.
- Choose an output format: image/jpeg, image/png, or image/webp.
- Click “Download resized image”. The file is processed locally and offered for saving.
Where it comes in handy
Create a 1200×630 pixel social share image from a larger photograph. The tool crops or scales while preserving the original aspect ratio, so you can hit that exact dimension without manual editing.
Reduce a 5 MB PNG to a 150 KB WebP file for faster web loading. The browser converts the data locally; no upload time is needed.
Generate a 512×512 thumbnail grid from a high-resolution portrait. Enter the width, leave the height empty, and select PNG to maintain transparency if the source image has it.
Worth knowing
- Scaling up beyond the original pixel count does not add detail; the image can appear soft. Keep enlargements under about 20% for acceptable quality.
- When you enter a percentage, it overrides any explicit width or height values you typed. The tool applies the percentage to both dimensions proportionally.
- Output dimensions are rounded to the nearest whole pixel. If you need exactly 800×600, enter those numbers directly rather than relying on a percentage calculation.