How it works
Images are processed entirely in your browser. For "By Size", the script adjusts quality (and if needed resizes) until the output reaches the requested size (approx.). For best results use JPG/WEBP output.
Notes
- Some formats (PNG) compress poorly with quality parameter—choose JPG or WEBP for stronger compression.
- If extreme reduction requested, image will be resized which lowers pixel dimensions.
- Large files can be CPU intensive — compress smaller batches for speed.
Output
A ZIP (compressed.zip) will be generated containing all processed images.