Video to MP3 (Extract Audio)

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extract part of a video as mp3

Extract just a section of a video as MP3

After you drop the video, the tool draws the audio waveform. Drag the handles over it, or type the start and end, and extract: only the marked section is decoded and encoded.

Trimming by waveform and by exact time

The audio waveform works as a map: speech shows up as blocks of uneven height, silences as flat lines and music as dense bands. That lets you find the start of a speech or the end of a song without listening to the whole file. The handles move with the mouse or a finger; with a handle selected, the arrow keys step one video frame at a time and Shift plus arrow steps one second. For millisecond precision, the time fields accept formats like 1:30, 1:30.5 and 90, and the Start here button marks the point where the preview is playing.
Only the chosen section is decoded for the output, so extracting 2 minutes from a 3-hour recording does not write or process the 3 hours for the final file. The MP3 size is the bitrate times the section's length: 150 seconds at 192 kbps is 3.6 MB, and 90 seconds at 128 kbps is 1.44 MB. The file's length matches the section, plus 0.03 to 0.05 second from the encoder. If the section starts in the middle of a word, move the handle to a silence on the waveform: the cut applies no fade, and an abrupt start can produce an audible click.
The analysis that draws the waveform also measures the whole file's loudness, once. With that, when you change the section, the chosen piece's loudness is recomputed instantly, without decoding again, and normalization uses only its loudness. On recordings with a loud part and a quiet part, that avoids setting the gain from the whole thing and leaving the part you want too low.

Sections and file sizes

A song in the middle of a concert

Input: 1:30 a 4:00 (150 s), 192 kbps
Expected output: 3,6 MB

192,000 x 150 / 8 = 3,600,000 bytes.

An answer in an interview

Input: 12:10 a 13:40 (90 s), 128 kbps
Expected output: 1,4 MB

128,000 x 90 / 8 = 1,440,000 bytes.

A short ringtone

Input: 0:05 a 0:35 (30 s), 256 kbps
Expected output: 0,96 MB

256,000 x 30 / 8 = 960,000 bytes.

A long speech

Input: 10:00 a 40:00 (30 min), 128 kbps
Expected output: 28,8 MB

128,000 x 1800 / 8 = 28,800,000 bytes.

Full tool FAQ

How do I convert a video to MP3 without uploading the file?

Choose the video and click Extract. Reading, decoding and MP3 encoding all run in your browser, in a Worker, with no upload. The file only sits in your device's memory while it is processed.

Which MP3 bitrate should I pick?

Why does it say my video has no audio?

Can I extract just part of the video?

What does normalization do?

MP3, WAV or M4A: which format?

My video has 5.1 sound or 96 kHz audio. Now what?

Is there a size or length limit?

Which video formats are supported?

Does the MP3 get a title and artist?

Frequently asked questions

How do I mark the start and end precisely?

Drag the handles over the waveform and refine with the arrow keys (one frame at a time) or by typing the time. The field accepts 1:30, 1:30.5, 90 and 1m30s.

Does the cut have a fade or a click?

There is no automatic fade. A cut in the middle of a sound can click; move the handle to a silent point on the waveform, or refine the cut afterwards in J-Kit's audio trimmer.

Can I extract several sections from the same video?

Yes, one at a time: after downloading the first, move the handles and extract again. The video stays loaded and the waveform analysis does not need to be redone.

Next steps

Trimming by waveform and by exact time

The audio waveform works as a map: speech shows up as blocks of uneven height, silences as flat lines and music as dense bands. That lets you find the start of a speech or the end of a song without listening to the whole file. The handles move with the mouse or a finger; with a handle selected, the arrow keys step one video frame at a time and Shift plus arrow steps one second. For millisecond precision, the time fields accept formats like 1:30, 1:30.5 and 90, and the Start here button marks the point where the preview is playing.

Only the chosen section is decoded for the output, so extracting 2 minutes from a 3-hour recording does not write or process the 3 hours for the final file. The MP3 size is the bitrate times the section's length: 150 seconds at 192 kbps is 3.6 MB, and 90 seconds at 128 kbps is 1.44 MB. The file's length matches the section, plus 0.03 to 0.05 second from the encoder. If the section starts in the middle of a word, move the handle to a silence on the waveform: the cut applies no fade, and an abrupt start can produce an audible click.

The analysis that draws the waveform also measures the whole file's loudness, once. With that, when you change the section, the chosen piece's loudness is recomputed instantly, without decoding again, and normalization uses only its loudness. On recordings with a loud part and a quiet part, that avoids setting the gain from the whole thing and leaving the part you want too low.

Sections and file sizes

A song in the middle of a concert

Input: 1:30 a 4:00 (150 s), 192 kbps
Expected output: 3,6 MB

192,000 x 150 / 8 = 3,600,000 bytes.

An answer in an interview

Input: 12:10 a 13:40 (90 s), 128 kbps
Expected output: 1,4 MB

128,000 x 90 / 8 = 1,440,000 bytes.

A short ringtone

Input: 0:05 a 0:35 (30 s), 256 kbps
Expected output: 0,96 MB

256,000 x 30 / 8 = 960,000 bytes.

A long speech

Input: 10:00 a 40:00 (30 min), 128 kbps
Expected output: 28,8 MB

128,000 x 1800 / 8 = 28,800,000 bytes.

Full tool FAQ

How do I convert a video to MP3 without uploading the file?

Choose the video and click Extract. Reading, decoding and MP3 encoding all run in your browser, in a Worker, with no upload. The file only sits in your device's memory while it is processed.

Which MP3 bitrate should I pick?

Why does it say my video has no audio?

Can I extract just part of the video?

What does normalization do?

MP3, WAV or M4A: which format?

My video has 5.1 sound or 96 kHz audio. Now what?

Is there a size or length limit?

Which video formats are supported?

Does the MP3 get a title and artist?

Frequently asked questions

How do I mark the start and end precisely?

Drag the handles over the waveform and refine with the arrow keys (one frame at a time) or by typing the time. The field accepts 1:30, 1:30.5, 90 and 1m30s.

Does the cut have a fade or a click?

There is no automatic fade. A cut in the middle of a sound can click; move the handle to a silent point on the waveform, or refine the cut afterwards in J-Kit's audio trimmer.

Can I extract several sections from the same video?

Yes, one at a time: after downloading the first, move the handles and extract again. The video stays loaded and the waveform analysis does not need to be redone.