Compression Streams API

Baseline Widely available *

This feature is well established and works across many devices and browser versions. Its been available across browsers since May 2023.

* Some parts of this feature may have varying levels of support.

Learn more
See full compatibility

Note: This feature is available in Web Workers.

The Compression Streams API provides a JavaScript API for compressing and decompressing streams of data using the gzip or deflate formats.

Built in compression means that JavaScript applications will not need to include a compression library, which makes the download size of the application smaller.

The Fetch API's Response can be used to convert streams to:

Interfaces

CompressionStream: Compresses a stream of data.
DecompressionStream: Decompresses a stream of data.

Examples

In this example a stream is compressed using gzip compression.

const compressedReadableStream = inputReadableStream.pipeThrough(
  new CompressionStream("gzip"),
);

In the following example a function decompresses a blob using gzip.

async function DecompressBlob(blob) {
  const ds = new DecompressionStream("gzip");
  const decompressedStream = blob.stream().pipeThrough(ds);
  return await new Response(decompressedStream).blob();
}

Specifications

Specification
Compression # compression-stream

Browser compatibility

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This page was last modified on Sep 6, 2025 by MDN contributors.

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Compression Streams API
Interfaces
1. CompressionStream
2. DecompressionStream