Convert audio
Convert audio encodes to MP3, WAV, M4A, OGG, or FLAC. Video accidentally dropped here loses the picture (`-vn`). Pick WAV or FLAC if the source is a master you still care about; pick MP3 if a person in a car needs to hear it.
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Audio
Convert, trim, merge, compress, and normalize audio, or pull a soundtrack off a video — FFmpeg in the browser, file never uploaded.
Runs in your browser · Nothing uploaded
- Convert audioMP3, WAV, M4A, OGG, or FLAC, encoded on this device.Runs in your browser · Nothing uploaded
- Trim audioCut an audio file to a start and end time.Runs in your browser · Nothing uploaded
- Merge audioConcatenate audio files into one MP3.Runs in your browser · Nothing uploaded
- Compress audioRe-encode at a lower bitrate for a smaller file.Runs in your browser · Nothing uploaded
- Normalize volumeEven out loudness with FFmpeg loudnorm, in the browser.Runs in your browser · Nothing uploaded
- Audio from videoSame extract as the video tool — soundtrack off a clip, no upload.Runs in your browser · Nothing uploaded
About Audio
Audio converters on the internet are the same pattern as video: upload a voice memo, wait, download an MP3 with a watermark if you skip the account. These pages use the same local FFmpeg core as the video tools. First load is about 30 MB. The recording is not part of that download.
Convert writes MP3, WAV, M4A, OGG, or FLAC. Trim and merge re-encode to MP3 so mismatched inputs still play. Compress is bitrate. Normalize is loudnorm, one pass. From-video is the extract job under an audio URL.
WAV and FLAC are for keeping. MP3 is for sending. I will not print “HD MP3.”
Tools in this category
Trim audio
Trim audio cuts start and end and writes MP3. Same idea as video trim: set a short window on a long interview instead of encoding the hour.
Merge audio
Merge audio concatenates in drop order into one MP3. Part one and part two of an interview, a cold open plus a show. Sample-rate mismatches get pulled onto one encode rather than a brittle stream copy.
Compress audio
Compress audio re-encodes at 64–192 kbps MP3. Smaller file, more artefacts. Voice survives 64 kbps better than music. If the source is already 64 kbps, you will not enjoy another pass.
Normalize volume
Normalize volume runs FFmpeg loudnorm and writes MP3. Quiet speaker vs close mic. It is not a calibrated −16 LUFS box; it is “make this less jumpy.” Two-pass loudnorm is more accurate and twice as slow — not on this page.
Audio from video
Audio from video is the same extract as the video category: MP3, WAV, or AAC off a clip. Use whichever URL you remember. Related links go both ways.
Common questions
Should I keep WAV/FLAC or convert everything to MP3?
Keep WAV or FLAC if the source is a master you still care about. Convert to MP3 when you need a file someone can play in a car. There is no “HD MP3” that undoes a lossy encode.
How is Audio from video different from Extract audio?
It is not, on purpose. Same FFmpeg arguments, same formats. One lives under Video, one under Audio, because people search both. Use either.
Does normalize change the performance or just the level?
Loudness. Dynamics get evened toward the filter’s target. It will not remix a band. If you need a true limiter or a specific LUFS, use a desktop loudness meter.
Why these tools don't upload your files
There is no server to upload to. Each page is a static file, and the work happens in your browser. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network and it keeps working. The longer explanation