Image Resizer
Change an image’s width and height in pixels, cm or inches, or by a percentage. Keep its shape, crop to fill, or add borders. Up to 20 images at a time.
Advertisement
How the Image Resizer works
- You choose the size and the preview shows exactly how the selected image will come out, before anything is uploaded.
- Your image is sent to our server over an encrypted connection and held in memory only.
- It’s resized with Lanczos resampling, which keeps edges and text sharp. Phone photos are turned the right way up first, so width and height mean what you see. Metadata is removed unless you keep it; the colour profile always stays.
- The result comes back to your browser, and both copies are deleted from the
server at that moment. The file name ends with the new size, for example
photo-1080x1080.jpg.
Sizes in cm, mm or inches are turned into pixels at the DPI you set: pixels = inches × DPI, and an inch is 2.54 cm. JPEG and PNG files record that DPI, so they print at the intended size.
When the new size has a different shape
With the chain icon locked, the image keeps its shape and fits inside the width and height you give. Unlock it to make the image an exact size, then choose what happens to the difference:
- Crop to fill: the image is scaled to cover the whole size and the edges that don’t fit are trimmed, evenly from both sides. Best for social media posts and thumbnails.
- Add borders: the whole image is kept and the leftover space is filled with the colour you pick, or left transparent in PNG, WebP and AVIF.
- Stretch: the image is squeezed or stretched to the size, which distorts it. Use it only when the shapes are nearly the same.
Frequently asked questions
How do I resize an image without stretching it?
Keep the chain icon locked and type a width or a height; the other side follows the image’s shape. If you need an exact size with a different shape, unlock it and choose “Crop to fill”, which trims the edges, or “Add borders”, which keeps the whole image and fills the gaps with a colour. Only “Stretch” changes the image’s proportions.
How do I resize a photo to centimetres or inches, for example for a form?
Choose cm, mm or inches next to the size, then set the DPI the form asks for (300 is common for print). The resizer works out the pixels, for example 3.5 × 4.5 cm at 300 DPI is 413 × 531 pixels, and writes the DPI into JPEG and PNG files so they print at that size.
Can I resize an image and keep it under a file size, like 50 KB?
Yes. Under “Output”, tick “Keep under” and enter the size. The resizer keeps the pixel size you chose and lowers the quality only as much as needed. If the image can’t get that small at those dimensions, it tells you, so you can pick smaller dimensions. To shrink a file without caring about its exact dimensions, use the Image Compressor.
Will resizing make my image blurry?
Making an image smaller keeps it sharp; the resizer uses Lanczos resampling, a high-quality method. Making an image bigger can’t add detail that isn’t there, so large enlargements look soft. Tick “Don’t enlarge smaller images” when resizing a batch to stop small images being blown up.
Is my image uploaded? Is it private?
Yes, it’s uploaded to our own server over an encrypted connection. It’s held in memory, not saved to disk, and deleted the moment your browser receives the result, or after 30 minutes at the latest. We don’t look at, keep or share your images, and their names aren’t logged.
Which formats can I resize?
JPEG, PNG, WebP, AVIF and HEIC (iPhone photos), plus still GIF, BMP and TIFF. HEIC, BMP and TIFF are saved as JPEG (or PNG if they have transparency) so they open everywhere, or you can choose the format yourself.
Is there a limit?
Images up to 25 MB each, 20 at a time, and up to 12,000 pixels a side after resizing. It’s free and needs no account.