Image Resizer Guide

Quick answer

Select an image, set the target width or height, preserve aspect ratio when needed, choose the output format, and download the resized file.

What this tool does

The image resizer changes pixel dimensions for screenshots, thumbnails, documentation images, social cards, and web assets. It is useful before compression because reducing pixel count often lowers file size more than quality changes alone.

Supported input

• Browser-decodable images such as PNG, JPEG, and WebP
• Screenshots, product images, docs images, and social assets
• Images that fit in browser memory

Output

• Resized image file
• Updated dimensions
• Optional format or quality changes depending on the tool settings

Step-by-step use

1. Select an image.
2. Review original dimensions.
3. Enter a target width or height.
4. Keep aspect ratio enabled unless you intentionally need stretching.
5. Choose output format and quality.
6. Download the resized image.

Data handling and processing behavior

Processing is handled in the browser for this tool based on the current public implementation. Avoid entering sensitive images unless you have reviewed the implementation.

Limits

• Very large images can slow the browser.
• Color profile and metadata details may change after canvas processing.
• Resizing cannot recover detail that was not present in the source.
• Fixed-ratio outputs may require cropping, not just resizing.

Common errors

The image looks stretched

Width and height were changed independently. Preserve aspect ratio or crop to the target ratio.

The text is unreadable

The output is too small for the screenshot content. Increase the width or crop around the important area.

The file is still large

Resize first, then use the Image Compressor to adjust format and quality.

Next steps

• Image Resizer — open the tool
• Image resizing workflow guide — choose dimensions and ratios
• Aspect Ratio Calculator — compare source and target proportions
• Image Compressor — reduce output file size