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NewMastershot Studio is open: a video editor with no watermark on anything you export. Try it free

Resize image

Change a picture's size in pixels, percent, or centimeters, as many at once as you like. Free, with no upload.

Files stay on your device

Drop images to resize

Add one or as many as you like. Each is edited on your device, so nothing is uploaded.

PNG, JPG, WebP, HEIC, AVIF, SVG, BMP, and GIF. As many as you like, or a whole folder.

Resize
Every picture you add is saved with these settings.
Resize by

The height follows the width you type.

Shape

The whole picture is kept.

Turn

Clockwise above zero. The corners it leaves are filled in, or see-through in a PNG.

Mirror

Horizontal swaps left and right, as a mirror does. Vertical turns it upside down.

Every color becomes the gray of how bright it looks.

A JPG, PNG, or WebP stays what it is. Other pictures become JPG, or PNG when they're see-through.

Transparent areas and corners in a JPG

Type a width or a height.

How to resize an image online

Type the width or height you need in pixels, a percentage, or centimeters and inches at a DPI, add one picture or a whole folder, and download each resized file or all of them in a ZIP. Crop, turn, and mirror are a click away in the same place, and you can keep each file under a size in KB. Everything happens in your browser, so your pictures are never uploaded.

  1. Step 1

    Choose your pictures
    Add one picture, several, or a folder.

  2. Step 2

    Set the size
    Type a width or height in pixels, a percentage, or centimeters at a DPI.

  3. Step 3

    Download
    Save each resized picture, or all of them in a ZIP.

What to expect

Supported inputs
JPG, PNG, WebP, HEIC, AVIF, BMP, GIF, and SVG, one or many at once. HEIC opens in Chrome, Edge, and Safari on most computers, but not in Firefox.
What happens
Type one side and the other follows the picture's shape; type both to stretch it, or crop to a shape first so nothing stretches. A picture drawn smaller is shrunk in steps, so edges stay smooth. A JPG, PNG, or WebP stays in its format unless you choose another; HEIC and other photos become JPG. Every saved file is read back and checked before you see it.
Limits
A picture drawn larger than it is gets softer, since there are no new details to draw. A side can be up to 16,384 pixels. Very large pictures can be more than a phone's browser can hold; a computer handles them.

For one format, size, or task

The same tool, with the settings already picked.

Also

Private by design

Your images stay on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

Type only the width or only the height and the other side follows. To get an exact width and height, crop to that shape first, under Crop, then type both.

Yes. Choose cm, mm, or inches under Size, set the DPI the picture will be printed or uploaded at (300 for print, 72 or 96 for screens), and the pixels are worked out for you.

Yes. Choose or drop as many as you like, or a folder. Each is resized the same way, and you can download them one by one or all together in a ZIP.

Yes. Tick Keep under and type the size. The resized picture is saved at the highest quality that fits.

No. They're resized in your browser, on your device, so nobody else sees them.

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