# Convert a Buffer to a ReadableStream (/docs/guides/binary/buffer-to-readablestream)

<!-- agent-signals: reading_time_min: 1 · est_tokens: 280 · 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)

The naive approach to creating a [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) from a [`Buffer`](https://nodejs.org/api/buffer.html) is to use the `ReadableStream` constructor and enqueue the entire array as a single chunk. For a large buffer, this may be undesirable because it doesn't stream the data in smaller chunks.

```ts
const buf = Buffer.from("hello world");
const stream = new ReadableStream({
  start(controller) {
    controller.enqueue(buf);
    controller.close();
  },
});
```

***

To stream the data in smaller chunks, first create a `Blob` instance from the `Buffer`, then use [`Blob.stream()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob/stream) to create a `ReadableStream`.

```ts
const buf = Buffer.from("hello world");
const blob = new Blob([buf]);
const stream = blob.stream();
```

***

Pass a number to `.stream()` to set the chunk size.

```ts
const buf = Buffer.from("hello world");
const blob = new Blob([buf]);

// set chunk size of 1024 bytes
const stream = blob.stream(1024);
```

***

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