Image Compressor

How to use it

Drop up to 20 images onto the upload zone. The tool spins up a Web Worker for each file so compression happens in parallel without freezing the UI. A progress list shows the original size, the compressed size, and the percentage saved for each image.

Tune the quality slider (default 78%) and the maximum width (default 2560 px) to control aggressiveness. Larger images are automatically downscaled to the target width before compression, which typically doubles the savings. Download any file individually or grab everything as a ZIP.

• Parallel Web Worker compression for speed
• Per-image original/compressed/savings report
• Optional automatic downscaling to a max width
• Bulk ZIP download of all processed files

How aggressive should compression be?

Photographic content tolerates quality settings as low as 70% without visible artifacts. Screenshots, diagrams and text-heavy images benefit from staying above 85%, or switching to a lossless codec such as WebP-lossless.

If your site targets slow mobile networks, prefer aggressive compression plus max-width limits over marginal fidelity gains. Real-world testing shows that dropping quality from 90% to 78% cuts LCP scores dramatically while remaining visually indistinguishable to human viewers.