Browser Image Compressor & WebP/AVIF Converter

Images are usually the heaviest part of a web page. Oversized photos slow down loading, hurt Core Web Vitals such as Largest Contentful Paint and waste mobile data. This tool compresses images and converts them to modern formats directly in your browser, so you can optimise files before uploading them to a website, CMS or email.

How to use it

1. Add one or more images.
2. Choose the output format and quality.
3. Compare the original and compressed sizes and preview quality.
4. Download the optimised files.

Choosing a format

• WebP: typically 25 to 35% smaller than JPEG at similar quality, with transparency support. Supported by all modern browsers.
• AVIF: often 40 to 50% smaller than JPEG, excellent for photos, but slower to encode.
• JPEG: universal compatibility, good for photos.
• PNG: lossless; best for screenshots, diagrams and images with sharp edges and few colours.

Example

A 4.2 MB smartphone photo resized to 1920 px wide and saved as WebP at quality 75 typically ends up around 250 to 400 KB, with no visible difference on a typical screen.

Best practices

• Resize first. A 4000 px photo displayed at 800 px wastes most of its bytes, whatever the compression.
• Quality 70 to 80 is the sweet spot for photos in lossy formats.
• Serve modern formats with a fallback using the HTML picture element.
• Strip metadata such as camera EXIF and GPS location for privacy and size.
• Keep your originals; repeated lossy compression degrades quality.