Image Size ReducerReduce image size. Keep the quality.
Compress multiple images directly in your browser. Fast, private, and completely free. No uploads, no limits on batch size.
100% local processing Β· No server uploads
Built for real batches
Batch compression
Drop in a whole folder. A queue works through them three at a time.
Local processing
Everything happens in your browser. Nothing is uploaded.
Quality control
Presets, a quality slider, output format and a size cap.
Multiple formats
Read what your browser can decode; export JPEG, PNG or WebP.
Real savings
Every number is measured from the actual output file.
Bulk downloads
Grab one image, or everything in a single ZIP.
About Image Size Reducer
Image Size Reducer is a free, open-source image compression tool built to make image optimization simple, fast, and accessible. It allows users to reduce image file sizes directly in their browsers while maintaining control over quality and output settings.
Contributions are welcome on GitHub. Created with care by Murali and Anya.
Privacy
Images are read and compressed on your device with the Canvas API in a Web Worker. They are never uploaded and their contents are not stored. Only your theme and compression settings are kept in your browser's local storage.
Creators
Built and maintained by two people who like fast, private tools.