How to Convert MP4 to MP3 Free — No Upload, No File Size Limit
Want the audio from a video without the video? Here's how to extract MP3 from any video file in your browser — no upload, no account, no file size cap — and how to clip exactly the segment you need.
Quick Answer
Drop your video into the MP4 to MP3 converter — it runs FFmpeg inside your browser, so your file never leaves your device. Choose a bitrate (128 kbps for music, 64 kbps for speech), optionally set a time range to extract a clip, and download the MP3.
Extract Audio Free →5 Reasons People Convert MP4 to MP3
Video and audio serve different jobs. Here are the most common reasons people strip the audio track from a video file:
- 1
Save a lecture, podcast, or music video as audio
You downloaded a recorded webinar or conference talk as MP4. You want to listen while commuting — audio only, half the file size.
- 2
Compress storage — video to audio-only
A 500 MB MP4 recording of a meeting becomes a 5–10 MB MP3. If you only need the spoken content, keeping the video is wasted space.
- 3
Extract a song from a video
A live performance, fan recording, or music video contains a track you want in your audio library. Extracting to MP3 is the direct path.
- 4
Send audio without video overhead
Email attachments, messaging apps, and cloud storage all have size limits. An MP3 is far easier to send than a full video file.
- 5
Archive a video's audio track
Before deleting a large video file, extract the audio as a long-term archive. Narration, commentary, interviews — preserved at a fraction of the storage cost.
Step by Step: Extract MP3 from Any Video
- 1
Open the MP4 to MP3 converter and drop your video file
Go to the MP4 to MP3 tool and drag your video file onto the page, or click to browse for it. The file stays on your device — nothing is sent to any server.
- 2
Set the time range (optional)
If you only want a clip, enter a start time and end time in HH:MM:SS format. Leave both blank to convert the full video. This is the fastest way to extract a specific song, quote, or segment.
- 3
Choose your bitrate and audio settings
Select a bitrate between 64 and 320 kbps. For podcasts and speech, 64–96 kbps is fine. For music, 128 kbps is standard and 320 kbps is archival quality. Toggle mono or stereo, and optionally fill in ID3 tags (title, artist, album).
- 4
Click Convert and download your MP3
FFmpeg processes the file directly in your browser. When it finishes — usually within seconds for typical files — click Download to save the MP3. You can queue multiple files and convert them in sequence.
How to Extract Just a Clip from a Video
You don't have to convert the entire video. The time range feature lets you pull out any segment:
- •Start time — enter in
HH:MM:SSformat, e.g.00:01:30to begin at the 1-minute-30-second mark. - •End time — enter the point where you want the clip to stop, e.g.
00:03:45. Leave blank to run to the end of the file.
00:14:20 and end to 00:18:05. FFmpeg extracts exactly that segment — no need to trim after the fact.Bitrate Guide — Which Setting Should You Choose?
Bitrate controls the amount of audio data per second. Higher bitrate means better quality and larger files. Here's a quick reference:
| Bitrate | Best for | Notes |
|---|---|---|
| 64 kbps | Speech, podcasts, voice memos | Smallest file size, perfectly clear for speech |
| 128 kbps | Everyday music listening | Standard quality — transparent on most headphones |
| 192 kbps | Good quality music | Noticeably richer than 128 on good audio equipment |
| 320 kbps | Archival / highest quality | No audible difference from lossless for most people |
Note: MP3 is a lossy format. Even at 320 kbps, some audio data is discarded. For truly lossless archival, consider keeping the original video or exporting as WAV.
FAQ
Is there a file size limit?
No. FFmpeg WebAssembly runs entirely inside your browser — there is no server upload, so no server-side size cap applies. Very large files (several GB) may take longer to process, but there is no hard limit. The tool handles files of any size as long as your browser has enough memory.
Can I extract just part of the video?
Yes. Use the time range feature to set a start time and end time in HH:MM:SS format. FFmpeg will extract only that segment and convert it to MP3. This is useful for pulling out a single song from a concert recording or a key quote from a long interview.
Does it work for YouTube videos?
No — the tool processes files already on your device. It does not download videos from the internet or accept URLs. You need to have the video file saved locally before using the converter. The tool only reads files you drag in or select from your file system.
What's the quality difference between 128 and 320 kbps?
128 kbps is transparent quality for most music and virtually indistinguishable from higher bitrates on typical speakers or earbuds. 320 kbps is the highest standard MP3 bitrate — useful for archival copies or playback on high-end audio equipment. For speech, podcasts, or lectures, 64–96 kbps is more than sufficient.
Can I convert MOV, WebM, AVI, and MKV files too?
Yes. The tool uses FFmpeg, which supports virtually every major video format: MP4, MOV, WebM, AVI, MKV, and more. Drop any of these in and it will extract the audio track and encode it as MP3 at whatever bitrate you choose.