How to use the Resize Image tool
- Select your images or drop them onto the box. JPG, PNG, WebP and iPhone HEIC photos all work.
- Choose By pixels and type a width, a height, or both. Or pick a preset such as Instagram post or YouTube thumbnail.
- Prefer a quick shrink? Switch to By percent and drag the slider, for example to 50%.
- Click Apply settings again if you change anything, then download each image or all of them as a ZIP.
When you need to resize an image
Resizing changes the number of pixels in an image: its width and height. You need it more often than you might think:
- Social media platforms crop or recompress images that are not the size they expect. Uploading at the right size keeps your post sharp.
- Websites and blogs load faster with images sized to the space they appear in. A 4000-pixel photo shown 800 pixels wide wastes bandwidth.
- Online forms often require exact dimensions, such as 600×600 for a profile picture.
- Email and messaging are quicker with smaller images, and recipients do not have to download huge files.
Common image sizes
| Use | Size in pixels |
|---|---|
| Instagram square post | 1080 × 1080 |
| Instagram portrait post | 1080 × 1350 |
| Instagram / TikTok story | 1080 × 1920 |
| YouTube thumbnail | 1280 × 720 |
| Facebook cover photo | 851 × 315 |
| Full HD wallpaper | 1920 × 1080 |
| Blog article image | 1200 wide |
Platforms change their recommendations from time to time, so check the current guidance if precision matters.
Pixels or percent?
Use pixels when a website or platform tells you an exact size. Use percent when you simply want images smaller; 50% is a good starting point for phone photos, turning a 4032×3024 photo into 2016×1512, which is still plenty for screens.
Aspect ratio explained
The aspect ratio is the shape of the image: width divided by height. A typical phone photo is 4:3, a widescreen video frame is 16:9, and an Instagram post is 1:1. When you keep the aspect ratio, the image keeps its shape and only changes size. When you force a different ratio, the content is stretched. If you need a different shape, crop first and resize second.
Output format
Keep original saves JPGs as JPG and PNGs as PNG. You can also convert while resizing: choose WebP for the smallest files on a website, or JPG for maximum compatibility.
Frequently asked questions
How do I resize without stretching the picture?
Keep 'Keep aspect ratio' ticked and fill in only the width or only the height. The other side is calculated for you. If you fill in both, the image is scaled to fit inside that box without distortion.
How do I get an exact size like 1080×1080 from a rectangular photo?
Untick 'Keep aspect ratio' to force exact dimensions, but the image will be squashed or stretched. To avoid that, crop the photo to a square first and then resize it.
Will resizing reduce quality?
Making an image smaller keeps it sharp because detail is averaged down. Making it larger cannot add detail, so a small image enlarged a lot will look soft. Output quality is set high (90%) by default.
Does resizing make the file size smaller?
Yes, usually a lot. Halving the width and height leaves a quarter of the pixels, so the file typically shrinks to a quarter or less. To hit a precise KB limit, use the Compress Image to 20KB tool afterwards.
Can I resize many photos to the same width at once?
Yes. Add up to 20 images, set the width, and every image is resized with the same setting. Heights follow each photo's own shape.
Are my photos uploaded?
No. Resizing happens in your browser on your own device. Nothing is sent to a server.
Guide by the ToolsYes team · Last updated