MP4 to MP3 Converter — Free, Private, No Upload
Extract the audio from any MP4 video and save it as MP3, right in your browser. Your file never leaves your device — no upload, no queue, no watermark, no sign-up. Pick a bitrate and download in seconds.
Why use this MP4 to MP3 converter
Nothing is uploaded
Your video is converted on your own device using WebAssembly. Files never travel to a server — nothing to store, scan or leak.
No queues or limits
No daily quota, no premium tier, no waiting in line behind other users. Convert a 2-hour recording if you like — it is your hardware.
Choose the bitrate
Pick anything from 96 kbps for the smallest file up to 320 kbps for near-CD quality. Output is a standard MP3 that plays everywhere.
How to convert MP4 to MP3
- Drop your MP4 into the box above or tap to browse. MP4, MOV, WebM, MKV, AVI and most other video and audio files are accepted.
- Choose the MP3 bitrate. 192 kbps is a great balance of quality and size; pick 320 kbps for the best quality or 128/96 kbps for a smaller file.
- Press “Convert to MP3” and watch the live progress bar. The first run downloads the engine once (~10 MB), then it is cached.
- Preview and download. Play the result in the page, then save your MP3 — no watermark, no sign-up, ever.
Extract audio from MP4 without uploading a thing
MP4 to MP3 Converter is a free online tool that extracts the audio track from an MP4 video and saves it as an MP3 file, right in your browser — no upload, no sign-up, and your file never leaves your device. It is perfect for turning a lecture, podcast, interview, music video or screen recording into an audio file you can play anywhere.
Most online converters work the same way: you upload your file to their server, wait in a queue behind everyone else, and accept a daily cap or a watermark on the result. Tools like CloudConvert even limit how many free conversions you get per day. This converter takes a different approach — it runs FFmpeg, the industry-standard media engine, compiled to WebAssembly directly inside your browser tab.
That design has three big benefits. First, privacy: your video is processed on your own machine and never travels to a server, so there is nothing for anyone to store or leak — ideal for confidential recordings. Second, no limits: because you use your own hardware, there are no upload caps, daily quotas or premium tiers. Third, speed: extracting audio is fast because the video stream is discarded entirely — only the soundtrack is decoded and re-encoded to MP3.
Under the hood the tool decodes the audio and encodes it with the LAME MP3 encoder at the bitrate you choose, from 96 kbps up to 320 kbps. The output is a standard .mp3 file with ID3 tags preserved where possible, playable on every phone, car stereo, music player and browser. The first conversion downloads the engine (~10 MB) once; after that it is cached and the tool works instantly, even offline. Everything is free, with no account, no watermark and no tracking of your files.
Frequently asked questions
How do I convert MP4 to MP3 for free?
Drop your MP4 into the box above (or tap to browse), pick an MP3 bitrate such as 192 kbps, and press “Convert to MP3”. The audio is extracted in your browser and a download button appears in a few seconds. It is completely free with no watermark and no sign-up.
Is it safe to convert MP4 to MP3 online?
Yes. This converter runs FFmpeg compiled to WebAssembly inside your browser, so your video is never uploaded to any server. The file stays on your own device — you can even load the page, disconnect from the internet, and conversion still works.
Will converting MP4 to MP3 reduce the audio quality?
MP3 is a lossy format, so some quality is lost compared with the original, but at 192 kbps or higher the difference is inaudible to most people. Choose 320 kbps for near-transparent quality, or 128/96 kbps for the smallest file. The tool extracts the existing soundtrack — it never touches the video.
What is the maximum file size I can convert?
There is no artificial limit. Because conversion happens on your device, the only ceiling is your browser's available memory — comfortably several gigabytes on a desktop. Audio extraction is fast even for long videos because the video stream is discarded.
What formats can I convert to MP3 besides MP4?
You can extract MP3 audio from MP4, MOV, WebM, MKV, AVI, M4V, 3GP, WMV, FLV and TS videos, and you can also convert audio files such as M4A, WAV, FLAC, OGG and AAC to MP3.
Do I need to install software to convert MP4 to MP3?
No. Everything runs in your web browser — there is nothing to install, no extension to add and no account to create. It works on Windows, Mac, Linux, Android and iPhone.