# Convert a Uint8Array to an ArrayBuffer (/docs/guides/binary/typedarray-to-arraybuffer)

<!-- agent-signals: reading_time_min: 1 · est_tokens: 187 · updated: 2026-07-28 -->
Related: [Convert an ArrayBuffer to a string](/docs/guides/binary/arraybuffer-to-string.md), [Convert an ArrayBuffer to a Buffer](/docs/guides/binary/arraybuffer-to-buffer.md), [Convert an ArrayBuffer to a Blob](/docs/guides/binary/arraybuffer-to-blob.md), [Convert an ArrayBuffer to an array of numbers](/docs/guides/binary/arraybuffer-to-array.md), [Convert an ArrayBuffer to a Uint8Array](/docs/guides/binary/arraybuffer-to-typedarray.md), [Convert a Buffer to a string](/docs/guides/binary/buffer-to-string.md)

A [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) is a *typed array*, a view over data in an underlying `ArrayBuffer`. The `buffer` property returns that `ArrayBuffer`.

```ts
const arr = new Uint8Array(64);
arr.buffer; // => ArrayBuffer(64)
```

***

The `Uint8Array` may be a view over a *subset* of the data in the underlying `ArrayBuffer`. In this case, the `buffer` property returns the entire buffer, and the `byteOffset` and `byteLength` properties indicate the subset.

```ts
const arr = new Uint8Array(new ArrayBuffer(64), 16, 32);
arr.buffer; // => ArrayBuffer(64)
arr.byteOffset; // => 16
arr.byteLength; // => 32
```

***

See [Binary Data](/runtime/binary-data#conversion).