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# pretty-bytes [](https://travis-ci.org/sindresorhus/pretty-bytes)
> Convert bytes to a human readable string: `1337` → `1.34 kB`
Useful for displaying file sizes for humans.
*Note that it uses base-10 (e.g. kilobyte).
[Read about the difference between kilobyte and kibibyte.](https://web.archive.org/web/20150324153922/https://pacoup.com/2009/05/26/kb-kb-kib-whats-up-with-that/)*
## Install
```
$ npm install pretty-bytes
```
## Usage
```js
const prettyBytes = require('pretty-bytes');
prettyBytes(1337);
//=> '1.34 kB'
prettyBytes(100);
//=> '100 B'
// Display with units of bits
prettyBytes(1337, {bits: true});
//=> '1.34 kbit'
// Display file size differences
prettyBytes(42, {signed: true});
//=> '+42 B'
// Localized output using German locale
prettyBytes(1337, {locale: 'de'});
//=> '1,34 kB'
```
## API
### prettyBytes(number, [options])
#### number
Type: `number`
The number to format.
#### options
Type: `object`
##### signed
Type: `boolean`<br>
Default: `false`
Include plus sign for positive numbers. If the difference is exactly zero a space character will be prepended instead for better alignment.
##### bits
Type: `boolean`<br>
Default: `false`
Format the number as [bits](https://en.wikipedia.org/wiki/Bit) instead of [bytes](https://en.wikipedia.org/wiki/Byte). This can be useful when, for example, referring to [bit rate](https://en.wikipedia.org/wiki/Bit_rate).
##### locale
Type: `boolean` `string`<br>
Default: `false` *(No localization)*
- If `true`: Localize the output using the system/browser locale.
- If `string`: Expects a [BCP 47 language tag](https://en.wikipedia.org/wiki/IETF_language_tag) (For example: `en`, `de`, …)
**Note:** Localization should generally work in browsers. Node.js needs to be [built](https://github.com/nodejs/node/wiki/Intl) with `full-icu` or `system-icu`. Alternatively, the [`full-icu`](https://github.com/unicode-org/full-icu-npm) module can be used to provide support at runtime.
## Related
- [pretty-bytes-cli](https://github.com/sindresorhus/pretty-bytes-cli) - CLI for this module
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)