Image Resizer
Resize images by exact pixels or percentage, as JPEG, PNG or WebP.
Your image is resized entirely in your browser — it's never uploaded to a server.
Change the width and height of a picture
The Image Resizer gives a picture new pixel dimensions — either exact sizes you type in, or a percentage of the original. You can keep the original format or save as JPEG, PNG or WebP at the same time.
Resizing runs in your browser, so the image stays on your device. Large reductions are done in several halving steps rather than one jump, which keeps fine detail from turning jagged or blurry.
How to resize an image
- Click the upload box or drag in a PNG, JPG, WebP or GIF.
- Choose By size (px) to type a Width and Height, or By percentage to drag the Scale slider (1–200%).
- Leave Keep aspect ratio ticked so changing one side updates the other automatically. Untick it only if you want to stretch or squash the image.
- Pick a format under Save as, and set Quality for JPEG or WebP.
- Check the preview and the size line below it, then click Download resized image.
What the info line tells you
Under the preview you’ll see something like “4032 × 3024 → 1200 × 900 px · JPG · 214.6 KB”: the original size, the new size, the output format and the file size you’re about to download. It updates a moment after each change.
- File name: the new dimensions are added, so cat.jpg becomes cat-1200x900.jpg.
- Same as original: JPEG, PNG and WebP keep their format; GIF and other formats are saved as PNG, and an animated GIF becomes a still image.
- Transparency: PNG and WebP keep transparent areas. Saving as JPEG fills them with white.
Typical resizing jobs
- Profile and avatar pictures that must be a set pixel size, such as 400 × 400.
- Website images: scale a 4000-pixel camera photo down to the width your page actually shows.
- Application forms that ask for a photo within specific dimensions.
- Quick previews: make a 25% copy of a large image to share in chat.
Tips for clean resizing
- There’s no crop option, so typing a square size for a rectangular photo with Keep aspect ratio unticked will stretch it. Crop it to a square with the Image Cropper first, then resize here.
- Scaling above 100% makes the image bigger but can’t add detail, so enlarged photos look soft.
- PNG has no quality setting, so the Quality slider hides when PNG is the output. For a smaller photo file, choose JPEG or WebP.
- To cut the file size further after resizing, run the result through the Image Compressor. The guide on compressing images without losing quality explains why resizing first matters.
Image Resizer: common questions
How do I resize an image without distorting it?
Keep the Keep aspect ratio box ticked. The other side is then always calculated from the original proportions, so the picture is never stretched.
What’s the largest size I can make?
Each side can be up to 10,000 pixels, and the percentage slider goes up to 200%. Very large outputs depend on your device’s memory.
Does resizing reduce the file size?
Usually, yes — fewer pixels means less data. The format and quality also play a part, though, so a JPEG re-saved at high quality can occasionally come out larger than a heavily compressed original. The size line under the preview shows the exact figure before you download.
Why did my transparent background turn white?
JPEG can’t store transparency, so transparent areas are filled with white when you save as JPEG. Choose PNG or WebP to keep them see-through.
Is my image sent to a server?
No. The resized copy is drawn by your browser and saved straight to your device. For a cut-out with a transparent background, the Background Remover also works locally.