GZIP & Brotli Compressor — Side-by-Side Benchmark, Any File Size
Drop any file to compress with GZIP and Brotli at the same time. See compression ratio, speed, and savings side-by-side. Adjust levels 1–11. No upload, no size cap — streams big files to disk.
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Frequently Asked Questions
Both GZIP and Brotli run simultaneously in separate Web Workers. You see the compressed size, ratio, and processing speed for each algorithm at the same time — with a winner badge highlighting which achieved better compression.
Yes. Each algorithm processes in chunks inside its own Web Worker. The compressed output is streamed directly to your disk — bypassing browser memory limits entirely. There is no file size cap.
No artificial limit. Unlike upload-based tools that cap at 50–200MB, this runs entirely in your browser. Your system memory and disk space are the only constraints.
Brotli for static web assets (HTML, CSS, JS) — typically 15-25% better ratio than GZIP. GZIP for dynamic content, server logs, or anywhere compatibility matters most. This tool shows you the exact difference for your specific file.
Yes. The slider goes from 1 (fastest, largest) to 11 (slowest, smallest). GZIP uses levels 1-9, Brotli 1-11. Both algorithms recompress in real-time as you move the slider.
No. GZIP uses pako (pure JavaScript) and Brotli uses WebAssembly — both run fully in your browser. Nothing ever leaves your device.