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Brotli Compression Encoder/Decoder

Compress or decompress data with Brotli — the algorithm behind modern HTTP content-encoding — right in your browser, with size and ratio stats. Free in the browser (WASM); also available as a paid API (Node's native zlib).

Input

Or

0 = fastest, 11 = best compression (slower).

Loading compression engine…

Output

Add text or a file and press Compress — everything runs in your browser.

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Guides

Compress or decompress data with Brotli — the algorithm Google built for content-encoding on the modern web. Paste text or drop a file, pick a compression level, and get the result plus size and ratio stats — all in your browser.

How to use it

  1. Choose Compress or Decompress.
  2. Drop a file, or paste text (for Compress) / Base64-encoded Brotli data (for Decompress) into the text box.
  3. For Compress, set the Compression level — 0 is fastest, 11 squeezes the smallest output but takes longer.
  4. Press Compress or Decompress. The tool shows the Base64 output (copy or download it as text) alongside a stats table — original size, compressed size, and the compression ratio — plus a Download raw file button for the actual .br bytes rather than Base64 text.

Free in your browser, private by default

Everything runs client-side via a WebAssembly build of Brotli — your file or text is never uploaded. The compression level and mode never leave your device either.

Is there an API?

Yes. The same codec is available as a paid developer API (POST /v1/tools/brotli-compression) for scripts and backends where running a browser isn't practical. The API runs Node's own built-in Brotli support (zlib.brotliCompressSync/brotliDecompressSync, native since Node 11) and costs one credit per call; the input and output are Base64-encoded bytes since binary can't cross a JSON string field. The in-browser tool on this page stays free.

Brotli vs. gzip vs. zstd

Brotli, gzip/zlib/deflate, and Zstandard are all general-purpose lossless compressors, but they trade off differently. Brotli typically compresses text (HTML, CSS, JS) tighter than gzip at a similar speed, thanks to a built-in dictionary of common web strings — it's why most CDNs and browsers prefer it for HTTP responses today. Zstandard usually compresses faster than Brotli at comparable ratios and shines on very large or already-mixed binary data. Gzip/deflate remain the most universally supported format, including by tools that predate Brotli entirely.

What if my data isn't already Base64?

Paste plain text directly (mode: Compress) — the tool encodes it to UTF-8 bytes for you. If you already have raw Brotli-compressed bytes (a .br file, or output from another tool), upload the file directly rather than Base64-encoding it by hand.

Related tools

For the older, more universally-supported DEFLATE family (gzip, zlib, raw deflate), see the Gzip/Zlib/Deflate Tester. For a faster-but-larger alternative built for speed over ratio, try the LZ4 Compression Tool.

brotlicompressiondecompressiongzipzstdwasmbase64zlib

Use it from code

From 3 credits per call

REST API

curl -X POST https://api.iotools.cloud/v1/tool/brotli-compression \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": "SGVsbG8sIEJyb3RsaSBjb21wcmVzc2lvbiEgQnJvdGxpIGlz…",
    "mode": "compress",
    "quality": "11"
  }'

Swap in your own key from your account. The tool's fields are the body — no wrapper.

Ask an AI agent

Use the IOTools `brotli-compression` tool (Brotli Compression Encoder/Decoder) on this input:

YOUR_INPUT_HERE

Paste this at any agent connected to the IOTools MCP server, then add your input.

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