Free Online MP4 to MP3 Converter
Turn any MP4 video into a clean MP3 audio file — extracted entirely in your browser, so nothing is ever uploaded to a server. No watermark, no signup, and it works just as well on your phone. Ideal for podcasts, lectures, music videos and interview recordings.
Features
One-Click MP4 to MP3
Drop an MP4 file, hit Convert, download the MP3. No codec fiddling, no settings — the universal video-to-audio workflow in three clicks.
Clean MP3 Output
Around 190 kbps on average — transparent for voice, music and podcasts, with no audible loss from the original.
Works With Any MP4
H.264, H.265, AV1 video tracks with AAC, MP3 or Opus audio — whatever your MP4 contains, you get a standards-compliant MP3 back.
Massively Smaller File
The MP3 is a fraction of the original MP4 size — perfect for podcast drafts, meeting notes or mobile sharing.
Podcast-Ready Audio Quality
Tuned to the sweet spot for voice content — indistinguishable from the source, yet small enough to upload anywhere.
Voice-Optimized Encoding
More detail is kept for complex passages so spoken word stays natural, while quiet moments stay compact.
Instant Playback
Output MP3 writes the header atom up front so players and podcast apps can start immediately without re-buffering.
Seconds, Not Minutes
Audio-only re-encoding is dramatically faster than full video processing. A one-hour MP4 extracts in under a minute.
100% Private, 100% Free
Your MP4 never leaves your device. The converter runs directly in your browser tab — no server, no upload, no tracking.
Zero Server Upload
Files are read, converted and downloaded entirely on your own machine. We never see your video or the MP3 you extract.
No Watermark
The output MP3 is clean — no audio intro, no brand tag, no logo. Your audio, untouched.
Works Everywhere
Any modern browser on any device — Chrome, Firefox, Safari, Edge, desktop or mobile.
Loved by creators, students & researchers
Why people use BibiGPT to turn videos into text every day.
Trusted by 50,000+ users worldwide
“I paste a link and get clean captions in seconds — it saves me hours of retyping every single week.”
Maya R.
Content Creator · Repurposes short videos
“Exporting the transcript lets me review new words at my own pace instead of pausing the video constantly.”
Daniel K.
Language Learner · Studies with real videos
“Accurate, timestamped text I can quote directly. It has quietly become part of my daily workflow.”
Priya S.
Researcher · Cites public talks
FAQ'S
Frequently Asked Questions
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Need More Than 1 Conversion a Day?
Sign up free for unlimited MP4-to-MP3 conversions — plus AI transcripts, summaries and mind maps of the audio you just extracted. No watermark, no card required.