M4A to MP3 — Convert Locally in Your Browser
M4A to MP3: choose output format, quality and trim times. Convert locally, preview and download.
Files stay in your browser
Drop one audio or video file here · up to 300 MB
Files stay in your browser · ≤ 300 MB
Up to 1 GB on desktop and 300 MB on mobile. These are selection limits, not a guarantee of successful processing; long or high-resolution videos can exceed browser memory.
FFmpeg.wasm · Source code · Core source and licenses
How to use
- Choose an audio or video file.
- Select the output format and quality. Optionally set a start time and duration in seconds.
- Convert, preview the output and download the new file.
Example
To extract ten seconds of audio starting at 5 seconds from an MP4, choose MP3, start 5 and duration 10.
Details and limitations
Processing uses single-thread FFmpeg.wasm in your browser. Your media is not uploaded. The engine is downloaded on first use.
MP4 uses H.264/AAC, WebM uses VP8/Opus, and GIF has no audio. Audio output supports MP3, WAV, M4A, Ogg Opus and FLAC.
Converting a lossy file to FLAC or WAV does not restore lost quality. FFmpeg and bundled codecs have their own licenses; see the linked source.
FAQ
Are my files uploaded?
No. Conversion takes place in browser memory. Only the processing engine is downloaded.
Why can a large video fail?
Browser memory is limited. Try a smaller source or shorter clip. Some codecs are not included in the engine.
Related tools
Format references
Tool page updated: