How to resize an image
- Drop your JPG, PNG or WEBP images into the box above or press Browse files.
- Check the original size that appears in the width and height boxes.
- Type a new width. Leave Keep aspect ratio ticked so the height matches.
- Press Resize and check the new pixel size and file size.
- Save each image or download the batch as one ZIP file.
What this image resizer gives you
- The original size fills in on its own so you see what you change.
- An aspect ratio lock that is on by default to stop stretching.
- One size setting for a whole batch with each image fitted inside it.
- Smooth downscaling that keeps edges clean.
- The final pixel size and file size for every image.
- Full PNG transparency and no watermark.
What does an image resizer do?
An image resizer changes the width and height of a picture in pixels. A smaller size means fewer pixels. Fewer pixels mean a lighter file.
People often grab a compressor when a photo is too heavy. Size matters more. Pixel count grows with the square of the dimensions. Half the width and half the height leaves a quarter of the pixels. No quality setting can compete with that.
Why resize images?
A typical phone photo is about 4000 pixels wide. A blog post shows it at about 800. Serve the original and you send 25 times more data than the screen can use.
A resize to the size people will actually see is not a compromise. It simply removes waste. Your pages load faster. Your emails send faster. Your storage lasts longer.
Image sizes worth knowing
| Use | Size in pixels |
|---|---|
| Blog and article images | 1200 wide |
| Square social post | 1080 by 1080 |
| Portrait social post | 1080 by 1350 |
| Full screen banner or slide | 1920 by 1080 |
| Email newsletter | 600 wide |
| App icon or avatar | 512 by 512 or 1024 by 1024 |
Check the platform you post to. Sizes change from time to time.
Why the aspect ratio lock is on
Aspect ratio is the link between width and height. Change one without the other and the picture warps. Faces get wide. Circles turn into ovals. Text leans. People spot it right away and it almost never looks right.
With the lock on, you type a width and the tool works out the height. Type both and the tool fits the image inside that box. It keeps the shape so nothing stretches.
Turn the lock off only when you truly need fixed sizes and accept the stretch. Want to plan sizes ahead? The aspect ratio calculator does the math for you.
Downscale with confidence and avoid upscaling
Smaller images
A smaller image is a safe change. Your browser blends groups of pixels into fewer pixels with smooth sampling. The result looks clean.
Bigger images
A bigger image is a different story. The tool has to guess the new pixels from the ones around them. A 400 pixel image stretched to 1600 is not sharper. It is the same detail spread thin. It looks soft.
Need a large version of a small image? Go back to the original source. Is the art a vector? Export it at full size with the SVG converter. That redraws the art instead of guessing.
Resize first and then compress
The two steps stack. Resize a 6 MB photo to 1200 pixels and it might drop to 700 KB. Run that through the image compressor at 80 and it may fall to about 140 KB. It looks the same at its display size.
The other order wastes effort. You would compress detail you plan to throw away. For JPG photos the JPG compressor is a quick next step.
Image resizer tips
- Crop first with the image cropper so you resize only the part you keep.
- Resize to the largest size your site shows. Retina screens may need 2x.
- Keep your original files. You cannot get pixels back after you shrink.
- Want to print? Check the pixels you need with the DPI calculator.
Who uses an image resizer?
Bloggers fit photos to their content width. Shop owners make every product shot the same size. Social media managers hit exact post sizes. Teachers shrink photos before they add them to slides. Job seekers resize a headshot for an online profile. One quick batch handles all of these jobs.
Common image resizer problems
My image looks stretched
The aspect ratio lock was off. Turn it back on and resize again from the original.
My image looks blurry
You made it bigger than the original. Use a larger source file instead.
The file is still heavy
Run the resized image through a compressor. The two steps together save the most.
How this image resizer protects your photos
Your browser decodes each image on your own device. It redraws it at the new size and saves it in memory. No upload happens. No server keeps a copy. That makes the tool safe for personal photos and client work alike.