How to resize an image
- Drop an image onto the box or click to select one.
- Type a new width or height in pixels, or a scale percentage. With "Lock aspect ratio" on, the other side updates automatically.
- Choose the output format and click Resize & download.
Pixels, percentage and aspect ratio
Every digital image is a grid of pixels. A 4000×3000 photo contains 12 million of them — far more than a phone screen (about 1170 pixels wide) or a typical website column (700–1200 pixels) can show. Resizing reduces the grid, which makes the file dramatically smaller and faster to load, with no visible loss when the picture is displayed at its intended size.
The aspect ratio is the relationship between width and height, such as 4:3 for most camera photos or 16:9 for video. Keeping it locked prevents stretching. If a platform needs a different ratio (for example a square 1:1 profile picture), unlock it — but be aware that the image will be distorted rather than cropped.
Common image sizes
| Use | Size (px) | Ratio |
|---|---|---|
| Instagram post | 1080 × 1080 | 1:1 |
| Instagram / TikTok story | 1080 × 1920 | 9:16 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| Facebook cover | 851 × 315 | ~2.7:1 |
| LinkedIn banner | 1584 × 396 | 4:1 |
| Full HD wallpaper | 1920 × 1080 | 16:9 |
| Blog / website image | 1200 × 800 | 3:2 |
Resize, then compress
Resizing and compressing work best together. Resize to the size you actually need, then run the result through the Image Compressor to shave off the remaining bytes. Need a different file type? Try PNG to JPG or JPG to WebP.
Frequently asked questions
Will resizing make my image blurry?
Making an image smaller keeps it sharp. Making it larger than the original cannot add real detail, so enlarged images look softer. For best results, only scale down.
What does "lock aspect ratio" mean?
It keeps the width and height in the same proportion as the original, so the picture is not stretched or squashed. Change one value and the other updates automatically.
What size should I use for social media?
Common sizes: Instagram post 1080×1080, Instagram story 1080×1920, Facebook cover 851×315, YouTube thumbnail 1280×720, X/Twitter post 1600×900.
Is my image uploaded?
No. Resizing is done in your browser with the Canvas API. The image never leaves your device.