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Free online audio converter

Convert music and recordings to MP3, WAV, FLAC and more. Trim clips, adjust volume and process several files together. Free, with no sign-up or watermark.

Add files to get started

How to convert audio files online

  1. 1. Add your filesUpload audio, video, or a batch from your device, Google Drive, or Dropbox.
  2. 2. Choose an outputSelect a format and quality preset. Trim the recording or adjust its volume if needed.
  3. 3. Convert and downloadClick Convert, then download your audio files.

Trim and adjust audio before converting

Make these changes before you click Convert, without exporting a separate file for each step.

Trim the section you need
Set start and end times to keep an interview answer, a voice note or part of a song.
Adjust volume consistently
Choose Normalize volume to bring recordings to a similar listening level, or adjust the volume manually.
Set audio quality
Choose a quality preset or adjust bitrate, sample rate and channels. Available settings depend on the output format.

Popular audio conversions

Choose a conversion to start with the output format already selected.

  • WAV to MP3

    Make large recordings smaller for listening and sharing.

  • FLAC to MP3

    Create MP3 copies for a player that does not support FLAC.

  • M4A to MP3

    Convert a recording for a player or upload form that needs MP3.

  • MP3 to WAV

    Create a WAV file for an audio editor.

  • WAV to FLAC

    Keep your music lossless while using less space than WAV.

Choose the right audio format

MP3 for listening and sharing
MP3 keeps podcasts and music files small and works with most players. Keep the original recording if you plan to edit it later.
WAV for editing
WAV stores uncompressed audio and works with most audio editors. Files are usually much larger than MP3.
FLAC for a smaller lossless music library
FLAC compresses audio without discarding detail. Use it for a music library if your player supports it.
AAC, M4A, OGG or Opus
Choose one of these formats when your player, editor or publishing platform asks for it.

Save your settings for the next episode

For a weekly interview series, choose MP3 and Normalize volume. Save those settings as a recipe, then reuse them for each new recording. Trim each interview to the length you need.

A free account includes one saved recipe. Paid plans add larger batches, more recipes and delivery to a Google Drive or Dropbox folder after conversion. Compare the plans and conversion limits.

Audio Converter FAQ

Is the FastConvert audio converter free?

Yes. You can convert audio without an account or watermark within the Free plan limits: up to 2 files per batch, 100 MB per file, and 20 conversions per 24 hours.

Which audio formats can I convert?

You can convert between MP3, AAC, OGG, WAV, FLAC, Opus, M4A, WMA, AIFF, AIF and AIFC. You can also upload a video to extract its audio.

Can I convert multiple audio files at once?

Yes. Upload several files and convert them together. Each file can have its own format, quality and trim settings. Sign in to apply shared settings with a recipe.

Can I trim, normalize volume, and convert audio in one job?

Yes. Set the start and end times, choose Normalize volume and select an output format before converting. Normalization adjusts the listening level. It does not remove background noise.

Can I convert a video to audio with the audio converter?

Yes. Upload a video with sound, choose an audio format and click Convert. You will get an audio file without the video.

Should I use MP3, WAV, or FLAC?

Use MP3 for compact, widely playable files. Choose WAV for uncompressed music or editing. Choose FLAC to keep a lossless music collection in less space than WAV, as long as your player supports it.

Does converting audio improve its quality?

No. Converting MP3 to WAV or FLAC cannot restore detail lost from the original recording. Choose a format for playback or editing, rather than to improve the sound.

Can I save audio conversion settings for later?

Yes. A free account includes one saved recipe. Paid plans add more recipes, larger batches and delivery to a Google Drive or Dropbox folder after conversion.

Does the audio converter work on phones, tablets, Mac, Windows, and Linux?

Yes. Use a modern browser on your phone, tablet or computer. There is no app to install.

Are my uploaded audio files private, and when are they deleted?

Yes. FastConvert stores files temporarily only for processing and download. Files are kept for 24 hours on Free, 1 week on Basic, or 1 week on Pro, then scheduled for automatic deletion. Uploaded files are not used to train AI models. A connected cloud provider only receives or supplies a file when you choose that import or delivery action.

Browse audio converters by output format

Choose the format you want, then upload your audio or video files.

MP3

Convert video or audio files to MP3 in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

MP3 Converter
AAC

Convert video or audio files to AAC in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

AAC Converter
OGG

Convert video or audio files to OGG in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

OGG Converter
WAV

Convert video or audio files to WAV in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

WAV Converter
FLAC

Convert video or audio files to FLAC in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

FLAC Converter
OPUS

Convert video or audio files to OPUS in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

OPUS Converter
M4A

Convert video or audio files to M4A in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

M4A Converter
WMA

Convert video or audio files to WMA in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

WMA Converter
AIFF

Convert video or audio files to AIFF in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

AIFF Converter
AIF

Convert video or audio files to AIF in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

AIF Converter
AIFC

Convert video or audio files to AIFC in batches online. Use audio profiles and codec-aware controls for free, with no sign-up or watermark.

AIFC Converter