Question 1

What is GZIP compression?

Accepted Answer

GZIP is a file format and software application used for file compression and decompression. It uses the DEFLATE algorithm which combines LZ77 and Huffman coding. GZIP is the most popular HTTP content-encoding and is used by web servers to compress responses before sending them to browsers.

Question 2

What is the difference between GZIP, Brotli and Deflate?

Accepted Answer

GZIP wraps DEFLATE-compressed data with a header and CRC32 footer. Deflate (raw) is the underlying algorithm without the wrapper. Brotli is a newer Google algorithm that typically achieves 15-25% better compression than GZIP for text content and is supported by all modern browsers over HTTPS.

Question 3

Is my data uploaded anywhere?

Accepted Answer

No. All compression and decompression happens locally in your browser using the native CompressionStream and DecompressionStream APIs. Your text never leaves your device.

Question 4

Which browsers support this tool?

Accepted Answer

This tool works in Chrome 80+, Firefox 113+, Edge 80+, Safari 16.4+, Opera 67+ and any modern browser with CompressionStream support. If your browser is too old, you will see a clear error message.