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Image Resizer

Change image dimensions in pixels.

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REAL-WORLD EXAMPLE

Resize several photos together

Try: Select 5 photos and set Maximum width to 1200 px, then Process all images.

Expected behavior: Each output fits within the requested bounds while preserving its own aspect ratio.

Batch mode does not enlarge smaller images.

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About the Image Resizer

Resize JPG, PNG and WebP pictures by pixel width and height with optional aspect ratio lock.

Formula or method

An HTML canvas resamples the image to the entered dimensions, then exports the chosen format.

Worked example

Resize a 2400 × 1600 image to 1200 × 800 for a smaller webpage graphic.

How to use the tool

  1. Choose JPG, PNG or WebP images and enter output width and height.
  2. For a single image, lock its aspect ratio; batch mode fits each picture within maximum dimensions.
  3. Process and download the outputs, then inspect the pixel dimensions and sharpness.

When this tool is useful

Change picture dimensions to meet website upload, social image or document requirements.

What to check before relying on the result

Upscaling cannot restore detail; resizing and format conversion may remove metadata or affect transparency.

Assumptions and limitations

Upscaling does not add real detail; resizing may blur text and images. Animated formats are not supported.

Frequently asked questions

Will my image be uploaded?

No, it is decoded and processed locally in your browser.

Will batch resizing stretch my photos?

No. Batch mode keeps each image's original aspect ratio and does not enlarge images already smaller than the maximum.

Continue with a related workflow

Privacy and support

Your inputs are processed locally in your browser. ToolMosaic does not upload or store the values you enter in this tool. Our tools are free, and we appreciate your support.