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Category · 6 tools

Free audio tools for podcasts, lectures and voice notes

Audio is usually the part people actually want: the interview inside a video, the voice memo inside an M4A, the WAV export that is ten times too big for a form. These tools pull audio out of video files and translate between the formats that phones, editing apps and podcast hosts expect.

Processing happens on our server with FFmpeg. Files are uploaded to a temporary directory, converted, and removed automatically after download; nothing is stored for later. Encoder settings are chosen so that speech stays clear and music stays intact at a sensible file size.

Audio ConverterMP3WAVMP3 / WAV / M4AAudio CutterMP3WAVMP3 / WAVAudio JoinerMP3WAVMP3 / WAVM4A to MP3M4AAACMP3MP4 to MP3MP4M4VMP3WAV to MP3WAVMP3

Choosing the right audio format and bitrate

MP3 remains the universal exchange format: every device, podcast host and editing app plays it. WAV is uncompressed PCM, excellent for editing but ten times larger than MP3 — useful for archives, awkward for uploads. M4A usually contains AAC, which sounds better than MP3 at the same bitrate, but is less universally supported, especially on older Windows software and some web forms.

Bitrate decides the size/quality trade-off. Speech stays clear at 96–128 kbps mono, music wants 192–256 kbps stereo, and 320 kbps is only worth it if the source is high quality and you plan to edit further. Extracting MP3 from a video always re-encodes the audio, so start from the best source you have rather than from an already-compressed MP3.

A podcast episode from an MP4 recording
MP4 to MP3 at 192 kbps gives a clean file that every podcast host accepts.
A lecture recorded as WAV
WAV to MP3 at 128 kbps mono can shrink a file by 90% while keeping speech intelligible.
An iPhone voice memo for a client
M4A to MP3 avoids playback problems on older Windows machines and email previews.

Guides for Audio Tools

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The format background, trade-offs and failure modes behind these tools — written for people who want to know why a conversion works the way it does.

Audio Tools questions

Can I extract audio from a video?
Yes. Use the MP4 to MP3 tool to pull the audio track out of an MP4 or MOV file and download it as an MP3, which is accepted by podcast hosts, transcription services and media players.
What MP3 bitrate should I choose?
128 kbps is fine for speech and lectures. Choose 192 kbps for music you will listen to on headphones, and 320 kbps when the MP3 is going to be edited further. Higher bitrates make larger files without improving the source quality.
Do you keep my audio files?
No. Uploads and converted audio are written to a temporary working directory and deleted automatically when the job finishes. They are never written to permanent storage.
Can I convert a protected or DRM audio file?
No. The tools cannot and will not remove DRM or copy protection. They only convert files you already have the right to use, such as your own recordings or audio from videos you are allowed to repurpose.
What is the difference between M4A and MP3?
M4A usually contains AAC audio, which sounds better than MP3 at the same bitrate but is less universally supported. MP3 plays almost everywhere, which is why people convert M4A to MP3 before sharing a file.

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