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CentralMirror

Image Dimension Changer

Change an image to exact pixel dimensions or scale it by a percentage, keeping its original format — handy for websites, presentations and social media.

Drag and drop a file here, or

JPG/JPEG, PNG, WebP · up to 25 MB per file

Your image is processed entirely inside your browser using the built-in canvas feature. It is not uploaded to CentralMirror or anyone else, and it is discarded when you close or leave the page. Privacy policy

How to use the Image Dimension Changer

  1. 1Choose or drop a JPG, PNG or WebP image.
  2. 2Type a new width or height (the other side follows when the aspect ratio is locked), or enter a percentage.
  3. 3Pick the output format if you want to change it, and adjust quality for JPG or WebP.
  4. 4Click "Change dimensions", check the preview and download.

Supported formats and limits

  • Input: JPG/JPEG and PNG (WebP where noted).
  • Maximum file size: 25 MB per image.
  • Maximum resolution: 40 megapixels (for example 8000 × 5000 px), to avoid running out of memory on phones.
  • Camera rotation (EXIF orientation) is applied automatically; other metadata such as GPS location is removed from the output.
  • Input also accepts WebP.
  • Output: same format as the input by default, or JPG / PNG / WebP.
  • Maximum output size: 8000 pixels on either side.

Frequently asked questions

Does enlarging an image add detail?

No. Making an image larger than the original spreads the same pixels over a bigger area, so it can look soft. Shrinking keeps it sharp.

Will a PNG stay transparent?

Yes, if you keep PNG or choose WebP as the output. Converting to JPG fills transparent areas with white.

What is the difference between this and the Photo Resizer?

The Photo Resizer focuses on forms: it always outputs JPG and can hit a maximum KB size. This tool keeps your format and focuses on exact dimensions.

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