Convert FLAC to M4B
Convert your FLAC audio files to M4B directly in your browser.
How to convert audio in 3 steps
Choose a FLAC audio file.
Click convert to M4B.
Download your M4B audio.
Format descriptions
FLAC — FLAC is an open-source lossless audio format that compresses without losing quality, roughly halving file size. Ideal for audio archives.
M4B — M4B is the MP4-based container used for audiobooks. It supports chapters and bookmarks, using the AAC codec just like M4A.
Technical comparison: FLAC vs M4B
Technical breakdown of the FLAC and M4B specifications: compression, colour, transparency and animation support.
| Property | FLAC | M4B |
|---|---|---|
| Specification | FLAC (Free Lossless Audio Codec) | M4B (MPEG-4 Audiobook Container) |
| Media type | Audio | Audio |
| Compression | Lossless · FLAC | Lossy · AAC |
| Color space / bit depth | 16/24-bit up to 192 kHz | 16-bit up to 48 kHz |
| Transparency | Not applicable | Not applicable |
| Animation | No (static) | No (static) |
| Best for | FLAC is an open-source lossless audio format that compresses without losing quality, roughly halving file size. Ideal for audio archives. | M4B is the MP4-based container used for audiobooks. It supports chapters and bookmarks, using the AAC codec just like M4A. |
What happens when converting FLAC to M4B?
The FLAC data is decoded inside your browser with WebAssembly and re-encoded to the M4B specification, so no file is ever uploaded to a server. Both formats rely on comparable compression, so file size and perceived quality stay in the same range.
Frequently Asked Questions
What is audio conversion?
Audio conversion changes an audio file from one format to another, for example from FLAC to M4B, while keeping the audio content.
Are my audio files uploaded?
No. This tool processes audio files directly in your browser. Your audio files are never sent to a server.
Which audio formats are supported?
This tool converts FLAC audio files to M4B, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many audio files as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in M4B format, ready to download and use.
About the audio converter
Convert FLAC to M4B audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Audio Converters
- Compress Audio OnlineCompress MP3, WAV, OGG, M4A, AAC, OGA, FLAC, ALAC, AIFF, OPUS, M4B and AC3 audio files online for free. Reduce the file size of your audio recordings while keeping good quality. Everything happens in your browser: audio files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert FLAC to MP3Convert FLAC to MP3 audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert FLAC to WAVConvert FLAC to WAV audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert FLAC to OGGConvert FLAC to OGG audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.