All tools
File Compressor
Compress or decompress any file with the browser's native gzip / deflate. Live ratio + savings readout.
Drop any file here, or click to choose
Compresses with gzip / deflate using the browser's native CompressionStream. Nothing leaves your machine.
gzip and deflate work great on text — JSON, CSV, logs, source code, SQL dumps. They don't shrink already-encoded media (JPEG, PNG, MP4, ZIP). For lossy image compression, use the Image Format Converter.
Runs entirely in your browser — nothing is sent to a server.