Stillmore

Free Audio Format Converter

Choose an audio file or a video with sound, then select MP3, WAV, M4A or FLAC.

Files stay in this browser. Choose up to 64 MB per job.

Only edit videos you own or have permission to edit. Stillmore does not offer a YouTube video downloader.

From a car-tour master to an MP3

The presenter opens the tour from the driver’s seat. Compare the eight-second WAV excerpt with the MP3 delivery copy.

The presenter introduces the car from the driver’s seat.
Original
Edited output

How to change an audio file’s format

  1. Choose the recording

    Open an audio file, or a video containing the soundtrack you want to keep.

  2. Match the delivery format

    Pick WAV if your editor asks for uncompressed audio, or choose MP3, M4A or FLAC from the format menu.

  3. Save the new copy

    Select Convert recording and download the file when its name and size appear.

One recording, different handoffs

Choose the format for the person or application that will open your file next.

Send feedback on a voice take

Make an MP3 that a collaborator can open for a quick listen before you commit to the edit.

Hand off a session recording

Supply a WAV when the sound editor requests uncompressed PCM for the timeline.

Build a lossless sound library

Convert an uncompressed field recording to FLAC to retain its decoded audio in a lossless file.

Deliver an AAC soundtrack

Choose M4A when a production brief requests AAC audio in an M4A container.

Audio format converter FAQ

Which format should I send my editor?

Ask which format their timeline accepts. WAV is useful for an uncompressed working copy. MP3 makes a smaller review file. Converting an existing MP3 to WAV preserves the sound it already contains.

What kind of WAV does the converter write?

The WAV option writes 16-bit PCM audio. Keep your original recording for projects that require its original bit depth.

What bitrate do MP3 and M4A use?

Both options encode at 192 kbps. The M4A file uses AAC.

Will the converted file still contain the video?

The download contains the audio track only. The source video stays on your device.

Can I convert a video with sound into an audio file?

Yes. Choose a video with an audio track, select the audio format you need and convert it. A silent video has no audio stream to convert.

Will converting an MP3 to FLAC restore lost detail?

No. FLAC preserves the audio it receives, including the losses already present in the MP3. Start with the original recording when available.

Can I convert only a short excerpt?

Conversion uses the full input. To make an MP3 excerpt, use the audio trimmer and set the start time and length.