M4B to OGG converter
A free M4B to OGG converter for MPEG-4 Audiobook files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your M4B files here
or browse your device · paste with Ctrl+V
Accepts .m4b files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your M4B files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
OGG is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your OGG
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
M4B
MPEG-4 AudiobookAn M4A that flags itself as an audiobook, so players remember your position and honour chapter markers. Audible titles land here once stripped of DRM.
- Developed by
- Apple
- Released
- 2003
- Extension
- .m4b
- MIME type
- audio/mp4
- Compression
- Lossy
OGG
Ogg VorbisXiph.Org's patent-free answer to MP3, slightly more efficient at the same bitrate. Long the standard for game audio and Spotify's original streaming format.
- Developed by
- Xiph.Org
- Released
- 2000
- Extension
- .ogg, .oga
- MIME type
- audio/ogg
- Compression
- Lossy
- Specification
- Open
- Both M4B and OGG are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
Questions about converting M4B to OGG
Is this M4B to OGG converter free?
Yes. Converting M4B to OGG here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my M4B file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for M4B to OGG?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Does converting M4B to OGG lose quality?
OGG is a lossy format, so some detail is discarded when it is encoded. At the default quality setting the change is often not visually obvious; keep your original M4B file if you might need it again.
Can I convert several M4B files to OGG at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does M4B to OGG work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to OGG
41 formats can become OGG here.
Convert M4B to other formats
A M4B file can become any of these.
OGG to M4B
The reverse conversion
MP4 to OGG
MP3 to OGG
WAV to OGG
Extract Audio from Video
Pull the soundtrack out of a video as an MP3.…
Compress Audio
Lower the bitrate of audio files to save space.…
Trim Audio
Cut a section out of an audio file.…
Normalise Audio
Even out loudness across files so nothing is jarring…