> ## Documentation Index
> Fetch the complete documentation index at: https://bun-1dd33a4e-farm-dc5e99a7-serve-route-target-normalization.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Compress and decompress data with gzip

Use `Bun.gzipSync()` to compress a `Uint8Array` with gzip.

```ts theme={null}
const data = Buffer.from("Hello, world!");
const compressed = Bun.gzipSync(data);
// => Uint8Array

const decompressed = Bun.gunzipSync(compressed);
// => Uint8Array
```

***

See [Docs > API > Utils](/runtime/utils) for more useful utilities.


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