How to resize an image
- Add one or more images by dropping them on the box, choosing them, or pasting from the clipboard.
- Choose pixels or percentage. In pixel mode, enter a width and leave the height empty, and the height is calculated to keep the original proportions (or the other way round). Enter both to fit the image inside that box. Choose Stretch only if you need an exact size and don't mind distortion.
- Pick a format. Same as original keeps JPG as JPG and PNG as PNG. Quality applies to JPG and WebP.
- Download each image, or all of them as a ZIP. Every file name gets the new size added, for example
photo-1080x810.jpg.
Common image sizes
| Use | Recommended size (px) | Aspect ratio |
|---|---|---|
| Instagram square post | 1080 × 1080 | 1:1 |
| Instagram portrait post | 1080 × 1350 | 4:5 |
| Instagram / TikTok story | 1080 × 1920 | 9:16 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| Facebook / LinkedIn link image | 1200 × 630 | 1.91:1 |
| Full-width website image | 1920 wide | any |
| Blog content image | 1200–1600 wide | any |
| Email newsletter image | 600 wide (1200 for sharp phones) | any |
Platforms change their recommendations from time to time, so check their help pages if an exact size matters. When an image has a different shape from the target, "fit inside" leaves it slightly smaller in one direction rather than distorting it.
Pixels, aspect ratio and DPI
A digital image is a grid of pixels. Its aspect ratio is width divided by height: a 4000 × 3000 photo is 4:3. If you change the width and height by different amounts, people and objects look squashed or stretched, which is why the tool calculates the missing side for you.
DPI (dots per inch) only matters when printing. To print at a given size, multiply the inches by the DPI: a 6 × 4 inch print at 300 DPI needs 1800 × 1200 pixels. Screens ignore the DPI value stored in a file, so for web use, only the pixel dimensions count.
Making images bigger
You can scale up to 400%, but enlarging can't add detail that wasn't captured: the result looks softer, not sharper. Enlarging is useful when a form demands a minimum size, or for small pixel art, but for better results start from the largest original you have.
Does resizing reduce file size?
Usually a lot. Halving the width and height leaves a quarter of the pixels, so a JPG typically shrinks to around a quarter of its size, often more. If you mainly want a smaller file rather than particular dimensions, the image compressor can resize and compress in one step, or hit a target such as 200 KB.
Frequently asked questions
How do I resize an image without losing quality?
Making an image smaller with high-quality scaling keeps it sharp. This tool scales down in steps, which avoids the jagged edges of a single big reduction. Save as PNG, or JPG/WebP at quality 90 or more, to avoid adding compression artifacts.
How do I keep the aspect ratio?
Fill in only the width or only the height and leave the other empty; the tool calculates it. If you fill in both, the default 'Fit inside' setting keeps the proportions too.
Can I resize several images at once?
Yes. Add as many as you like; the same settings apply to all of them, and you can download them together as a ZIP file.
What size should a profile picture be?
Most sites display profile photos as small squares but store them at 400 × 400 to 800 × 800 pixels. A square crop around 800 × 800 works almost everywhere.
Are my images uploaded?
No. Resizing happens in your browser, and the images never leave your device.
Files are processed in your browser and are not uploaded. Platform size recommendations change; check the platform's own guidelines.