Resize Image
Set exact pixel dimensions or scale by percent. Free, private and done entirely in your browser — nothing is uploaded.
or drag and drop files here
Resize images to exact dimensions
- Drop your images.
- Enter a width, a height, or both. With Lock proportions on, leaving one field blank calculates it automatically so nothing gets stretched.
- Or switch to Percent to scale everything by the same factor.
- Click Resize images and download.
Common sizes
Instagram post 1080×1080 · Facebook cover 820×312 · YouTube thumbnail 1280×720 · Full-HD wallpaper 1920×1080 · Profile picture 400×400.
Enlarging beyond the original size will soften the image — resizing works best when shrinking.
What does a resize image tool do?
A resize image tool changes a picture’s pixel dimensions, its width and height, so it fits a website slot, a social media post or an upload form. This one lets you type exact pixel values or scale by a percentage from 1% to 200%, and it can handle a whole batch of images in one go.
Resizing is not the same as compressing. Resizing changes how many pixels there are; compressing changes how efficiently they are stored. Fewer pixels usually means a smaller file too, which is why resizing is often the first step before uploading. Everything is processed locally in your browser.
How width, height and Lock proportions work together
The result depends on which boxes you fill in. Here is exactly what happens to a 4000 × 3000 photo, which has a 4:3 shape:
- Width 1080 only: the height is calculated for you, 3000 × 1080 ÷ 4000 = 810, giving 1080 × 810.
- Height 1080 only: the width becomes 4000 × 1080 ÷ 3000 = 1440, giving 1440 × 1080.
- Width 1080 and height 1080, Lock proportions on: the photo is scaled to fit inside a 1080 × 1080 box without distortion, giving 1080 × 810. Nothing is cropped, so it does not become square.
- Width 1080 and height 1080, Lock proportions off: you get exactly 1080 × 1080, but the picture is squashed sideways because its shape changed from 4:3 to 1:1.
- Percent at 50%: both sides are halved, giving 2000 × 1500, which is one quarter of the original pixel count.
When you need an exact shape such as a square or a 4:5 portrait, crop the photo to that aspect ratio first (most phone gallery apps can do this), then resize it here with the lock on.
Common image sizes and aspect ratios
| Use | Size (pixels) | Aspect ratio |
|---|---|---|
| Instagram square post | 1080 × 1080 | 1:1 |
| Instagram portrait post | 1080 × 1350 | 4:5 |
| Stories, Reels and other vertical video covers | 1080 × 1920 | 9:16 |
| YouTube thumbnail | 1280 × 720 | 16:9 |
| X (Twitter) header | 1500 × 500 | 3:1 |
| LinkedIn profile banner | 1584 × 396 | 4:1 |
| Full-width website banner | 1920 wide | Varies |
| Blog or article image | About 1200 wide | Varies |
| Image inside an email | 600 wide (1200 wide for sharp high-density screens) | Varies |
| US passport photo, digital upload | 600 × 600 up to 1200 × 1200 | 1:1 |
Platforms adjust their recommendations from time to time, and official photo rules for passports, visas or exam forms usually add requirements for file size, background color and head position. Always check the current guidelines of the site you are uploading to.
Tips for better results
- Shrink rather than enlarge. The percent slider goes up to 200%, but scaling up can’t invent detail; it only makes the image bigger and softer.
- Always start from the original. Resizing a copy that was already made smaller loses detail twice.
- Pick the right output format. PNG suits screenshots, logos and graphics with text; JPG or WebP suits photos. WebP output needs a browser that can create WebP files, such as Chrome, Edge or Firefox; Safari may save a PNG instead.
- Batches keep each image’s shape. With the lock on, one width setting applies to every file while portrait and landscape shots keep their own proportions.
- Files are named with their new size, for example photo-1080×810.jpg, so it is easy to see which version is which.
More questions
Does resizing an image reduce its quality?
Making an image smaller keeps it sharp at its new size, although detail finer than the new resolution is discarded. JPG and WebP results are saved at a high quality setting, so the extra loss from re-saving is minimal. Making an image larger, on the other hand, does make it look softer.
How do I resize an image without stretching it?
Leave Lock proportions ticked and enter only a width or only a height. If you enter both with the lock on, the image is fitted inside that box instead of being stretched to fill it.
How many pixels do I need to print a photo?
For good print quality, aim for about 300 pixels per inch. Multiply the print size in inches by 300: a 4 × 6 inch print needs 1200 × 1800 pixels, and a 5 × 7 inch print needs 1500 × 2100 pixels. This tool sets pixel dimensions only; it does not let you set a DPI value.
Can I resize a photo to an exact file size, like 50 KB?
Not directly, because file size depends on both dimensions and compression. Resize the image first, then run it through Compress Image and lower the quality until it falls under the limit.
After resizing, you can shrink the file further with Compress Image, change its format with Convert Image, or combine several resized photos into one document with JPG to PDF.
Further reading: Image scaling (Wikipedia).