What Is Image Compression?
Image compression is the process of reducing an image file's size while maintaining acceptable visual quality. Web pages that use unoptimised images load significantly slower, consume more bandwidth, and score poorly on Core Web Vitals — directly affecting search engine rankings and user experience.
There are two types: lossy compression permanently discards some visual information to achieve large size reductions (used for JPEG and WebP), and lossless compression reorganises data without removing any information (used for PNG). For most web images, a quality setting of 75–85% with lossy compression produces files 60–80% smaller with no visible quality difference.
How to Compress Images Online
Upload your images
Drag and drop one or more images onto the upload area. JPEG, PNG, WebP, GIF, BMP, and AVIF files are all supported. Upload up to dozens of files at once for batch compression.
Adjust compression settings
Set the quality level (75–85% recommended for web), choose an output format, and optionally set a maximum width/height or percentage scale for resizing.
Click Compress All
All images are compressed simultaneously in your browser. Each card shows a before/after size comparison and percentage saved.
Preview and compare
Toggle between the original and compressed version on each image card to visually verify quality before downloading.
Download
Download individual images with the per-card Download button, or click Download All as ZIP to get every compressed image in one archive.
JPEG vs PNG vs WebP
| Format | Compression | Transparency | Best For | File Size |
|---|---|---|---|---|
| JPEG | Lossy | None | Photos, hero images | Small |
| PNG | Lossless | Full alpha | Logos, screenshots, icons | Large |
| WebP | Lossy + Lossless | Full alpha | All web images | Smallest |
Frequently Asked Questions
Technical note: Compression uses the browser's built-in Canvas API ( canvas.toBlob()). Quality and file size results may vary slightly between browsers due to differences in their underlying image encoders. Chrome and Edge typically produce the most optimised WebP output. PNG output is always lossless regardless of the quality slider setting.
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