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Free video to MP3 converter, on your device
Video to MP3, without uploading your video
Choose a video from your phone or computer and save its sound as an MP3 at the bitrate you pick, or extract the original sound as M4A with nothing encoded again. Save all of it, or only the part you need.
- No sign-up, no watermark, no daily cap
- The video stays on your device
- MP3 up to 320 kbps, or the original as M4A
Save only part of the sound
Type a time like 1:05.5 or 65.5, drag the handles, or play the video and use the current position.
Keep this tab open until it finishes.
How to convert a video to MP3
Open the video
Tap Choose a video, or drop the file on the box. The tool names the format and bitrate of its sound, such as AAC at 128 kbps.
Pick MP3 or M4A
For MP3, choose 128, 192, 256 or 320 kbps. Choose M4A (original sound) to extract the sound exactly as it is in the video.
Keep only a part, if you like
Open Save only part of the sound and set where it starts and ends. Leave it closed to save the whole sound.
Download
Press Make the MP3 or Save the M4A, then Download. Your audio file is ready in your downloads.
Need a shorter video, or a silent one, instead of the sound? Cut a video or Mute a video.
MP3 or M4A: which to choose
Browsers can read the sound in a video, but they usually have no MP3 encoder of their own (Mediabunny). So for MP3 this page loads LAME, the open-source MP3 encoder, and encodes the sound again at the bitrate you pick. Every MP3 setting here is a constant bitrate, so the size is easy to predict:
| Choice | Size per minute | One hour | Good for |
|---|---|---|---|
| MP3, 128 kbps | 0.96 MB | 57.6 MB | Speech, lectures, voice recordings |
| MP3, 192 kbps | 1.44 MB | 86.4 MB | Music and most videos (the start) |
| MP3, 256 kbps | 1.92 MB | 115.2 MB | Music you will edit further |
| MP3, 320 kbps | 2.4 MB | 144 MB | The highest MP3 setting |
| M4A (original sound) | The same as the sound in your video | The same | Keeping the sound exactly as recorded |
M4A takes another route. It keeps the sound in AAC, a format designed to compress more than MP3 with better fidelity (MDN), and when the video's sound is already AAC it copies it with nothing encoded again. Choose MP3 when a player, a car stereo or an app accepts only MP3; choose M4A when you want the sound exactly as it was recorded.
A higher MP3 bitrate makes a bigger file, but it cannot add detail that the video's sound does not have.
What happens to each kind of sound
When you open a video, the tool names the format of its sound. This is what each choice does with it:
| Sound in the video | MP3 | M4A |
|---|---|---|
| AAC | Converted at the bitrate you pick | Copied exactly, no re-encoding |
| Opus (often in WebM) | Converted at the bitrate you pick | Converted to AAC at about the same bitrate |
| MP3 | Converted again at the bitrate you pick | Converted to AAC at about the same bitrate |
| PCM (uncompressed) | Converted at the bitrate you pick | Converted to AAC at 192 kbps or less |
| Dolby Digital (AC-3) and other formats | Only where the browser can decode it | Only where the browser can decode it |
Converted M4A sound uses about the bitrate of the original, from 128 to 192 kbps, and steps down only when the browser's AAC encoder will not take that bitrate; it never falls back to a vague default. If the browser cannot decode a sound format, the tool says so before it starts.
Extract the audio from a video, exactly as recorded
Choosing M4A for a video with AAC sound is a true extraction: the sound is lifted out of the video piece by piece and put into an audio-only file, with no decoder and no encoder involved. In our test, the 20 seconds of sound in a 22 MB clip came out in 50 milliseconds, and all 939 pieces of sound in the M4A were identical to the ones in the video.
Because nothing is decoded, this needs no sound decoder in the browser at all. When you save only part of the sound this way, the M4A holds only the pieces from your start to your end, so nothing from before the start is kept. To make a ringtone from a video's sound, the iPhone ringtone maker opens videos too and saves up to 30 seconds as an M4R.
Long videos and big files
Your browser reads the video from your device a little at a time and takes only the sound, so the size of the video matters far less than the length of its sound. In our test on a laptop, the sound of a one-minute video became an MP3 in about a second. The MP3 is held in memory until you download it: an hour at 192 kbps is about 86.4 MB, which most phones and computers handle well.
On an older phone, a recording of several hours can run out of memory. If the tool reports that, or the page reloads on its own, save the sound in two or three parts with Save only part of the sound.
What happens to your video
Everything happens inside this page. The video is not sent to uncrop.si or to anyone else. The first time you choose a video, your browser downloads the converter from uncrop.si, and the MP3 encoder too when you pick MP3; after that, the converting is done by your own device.
Under the download, a line counts every request this page has sent with data since you added your video, and says what each one was, so you can check for yourself that your video was not among them. The audio file is written with no title, recording date, location or device details from the video, such as the place a phone recorded it.
Videos from YouTube and other sites
This tool works only with video files that are already on your phone or computer. It does not download anything from YouTube, Instagram, TikTok or any other site, and pasting a link will not work. If you have a video file you are allowed to use, choose it here.
Which browsers can do it
The converting uses WebCodecs, the part of the browser that reads and writes sound and video. Chrome and Edge have it from version 94, Firefox on computers from version 130 and Samsung Internet from version 17. Safari has had part of it since 16.4 and all of it since version 26 (caniuse); sound decoding arrived in Safari 26 (WebKit). Firefox for Android does not have it. M4A from AAC sound is a straight copy, so it needs none of this.
| Browser | MP3 | M4A from AAC sound (a copy) |
|---|---|---|
| Chrome and Edge on a computer, version 94 or later | Yes | Yes |
| Chrome and Samsung Internet on Android | Yes | Yes |
| Firefox on a computer, version 130 or later | Yes | Yes |
| Safari 26 or later (iPhone, iPad, Mac) | Yes | Yes |
| Safari 16.4 to 18 | No: it cannot decode sound | Yes |
If something will not work in your browser, the tool tells you before it starts, and says what still works.
Questions
How do I convert a video to MP3 for free?
Choose the video on this page, leave MP3 selected, pick a quality and press Make the MP3. Then press Download. There is no account, no watermark and no daily limit.
Do I need to sign up or log in?
No. There is no account of any kind, and nothing to install. The page works as soon as it opens.
Can I convert a YouTube video or a link to MP3?
No. This tool only opens video files that are already on your device. It does not download from YouTube or any other site.
Which MP3 quality should I choose?
192 kbps suits music and most videos, at 1.44 MB per minute. Choose 128 kbps for speech to save space, or 320 kbps for the highest MP3 setting. A higher setting cannot make the sound better than the video's own sound.
How do I extract the audio from a video without converting it?
Choose M4A (original sound). When the video's sound is AAC, the tool copies it into an M4A file exactly as it is, with nothing encoded again. When it is not AAC, the tool tells you that M4A will convert it.
Can I save only part of the sound?
Yes. Open Save only part of the sound under the video, then drag the handles, type the start and end times, or play the video and press Use current position.
Does it work with MOV, WebM and MKV videos?
Yes. It opens MP4, MOV, WebM and MKV files, including iPhone videos in HEVC or H.264. It saves only the sound, so it works even when your browser cannot show the video's picture.
Is there a file size limit?
No set limit. The video is read a little at a time, and only the sound is kept, so even a large video makes a small audio file. Very long recordings on older phones can run out of memory; if that happens, save the sound in parts.
Sources: caniuse, WebCodecs API, WebKit, WebKit features in Safari 26.0, Mediabunny, MP3 encoder extension, MDN, Web audio codec guide, LAME, license
Open-source code this tool runs on your device: Mediabunny (MPL-2.0), unmodified, reads and writes the video and audio files; LAME (LGPL, source at SourceForge), the MP3 encoder (version 3.100), built without its decoder for the browser by @mediabunny/mp3-encoder (MPL-2.0) and loaded only when the new file is an MP3.
Related tools
MP4 to MP3 Turn an MP4 into an MP3 at 128 to 320 kbps, on your device and with no upload. Video to audio converter Keep just the sound of a lecture, speech or song you recorded, as MP3 or M4A, on your phone. 
Cut a video Keep the part you want with a fast cut that copies the video, or an exact cut that starts on any frame. New Mute a video Take the sound track out of a video, so it cannot be turned back on, without re-encoding.