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Image tools

Image resizer

Change an image's dimensions, without uploading it to any server.

Drop an image here or click to choose one — JPG, PNG or WebP

This tool runs entirely inside your browser. No file or text is sent to any server.

How to use

  1. Drag the image onto the image-selection box, or click that same box and choose the file from your device.
  2. Enter either the width or the height; with “keep aspect ratio” on, the other is worked out and filled in automatically so the image is not stretched.
  3. Adjust the output format and quality if you need to.
  4. Press “Download image” to save the result to your device.

Notes on this tool

As soon as you choose an image, its original width and height appear in the fields. With “keep aspect ratio” on, changing either one works out the other for you. Turn it off and you can set both freely — but the image may end up stretched or squashed.

The quality setting only affects JPG and WebP output. For ordinary photos, 75–85 cuts the file size noticeably without a visible difference.

If your image has transparent areas and you convert it to JPG, the transparency is lost — which is why you can pick a background colour there. WebP and PNG keep it.

iPhone photos are usually saved as HEIC, which no browser can open. Set your camera to “Most Compatible” so photos are saved as JPG.

The image you download does not carry its EXIF data, such as location and camera model.

Very large images may fail on older phones, since all the work happens on your own device.

Frequently asked questions

Why is the background colour only asked for JPG?
Because JPG is the one common format with no transparency channel, so transparent areas have to be filled with something — usually black if you do not choose. WebP and PNG keep transparency, so the question does not arise.
Which format is best for a smaller file?
WebP is usually smaller than JPG at the same quality and every current browser opens it. If the image has to work somewhere old, JPG is the safer choice.
Does resizing reduce quality?
Making an image smaller costs very little, and this tool does it in steps so edges stay clean. Making it larger adds no detail — pixels that were not in the original cannot be invented.
Why is the output sometimes larger than the original?
Usually when an already-compressed photo is re-saved at high quality, or a simple image is converted to PNG. Lower the quality or change the format.

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