Image Resizer
Set exact dimensions or pick a preset. The aspect ratio is locked by default so nothing gets stretched.
Drop an image here or click to choose
JPG, PNG or WebP · processed on your device
Resizing without ruining the image
Two rules cover almost every resize: keep the aspect ratio, and shrink rather than enlarge. Changing width and height independently stretches the picture, which is instantly obvious on faces. Enlarging invents pixels that were never captured, so a 500-pixel image blown up to 2000 looks soft no matter what tool you use. Shrinking, by contrast, is essentially lossless in appearance — you are throwing away detail that is genuinely surplus.
Common sizes
| Where | Pixels | Ratio |
|---|---|---|
| Instagram square | 1080 × 1080 | 1:1 |
| Instagram portrait | 1080 × 1350 | 4:5 |
| Story or Reel | 1080 × 1920 | 9:16 |
| Link preview card | 1200 × 630 | 1.91:1 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| Passport photo, EU/UK | 413 × 531 | 35 × 45 mm at 300 dpi |
| Passport photo, US | 600 × 600 | 2 × 2 in at 300 dpi |
Preset sizes turn the aspect lock off, because most of them force a specific ratio. If the result looks squashed, crop the image to the right shape first, then resize.
Pixels, inches and the DPI confusion
DPI is meaningless on a screen. An image is a grid of pixels; DPI only enters the picture when those pixels are mapped onto a physical size in print.
The arithmetic is simply pixels = inches × dpi. A 6 × 4 inch print at 300 dpi needs 1800 × 1200 pixels. If your file is 900 × 600, you can still print it — at 150 dpi, which is noticeably softer but often acceptable.
| Print size | At 300 dpi | At 150 dpi |
|---|---|---|
| 6 × 4 in | 1800 × 1200 | 900 × 600 |
| A4 | 2480 × 3508 | 1240 × 1754 |
| 8 × 10 in | 2400 × 3000 | 1200 × 1500 |
Changing the DPI number stored in a file without changing the pixels does nothing to image quality. Only the pixel count matters.
How to use the Image Resizer
- Drop in an image or click to choose one.
- Type a new width — the height follows automatically while the lock is on.
- Or drag the percentage slider, or pick a preset for a specific platform.
- Choose an output format and download.
Frequently asked questions
Does resizing reduce quality?
Making an image smaller barely affects perceived quality — you are discarding detail that would not be visible at the new size anyway. Making it larger does reduce quality, because the extra pixels have to be invented.
How do I resize without stretching?
Leave "keep the original proportions" ticked. Enter one dimension and the other adjusts automatically to preserve the aspect ratio.
Can I make a small image bigger?
You can, but it will look soft. Enlarging beyond about 150% of the original rarely looks good, because no detail exists to fill the new pixels.
Are my images uploaded?
No. Everything happens in your browser using the canvas API. The image never leaves your device and the page works offline.
How do I make a passport photo?
Crop the photo to the right shape first, then use the EU (413 × 531) or US (600 × 600) preset. Check your country’s specific requirements for head size and background, which vary.
Related tools
Last reviewed September 4, 2026. Results are estimates for general information only.