Free tool

Audio to MP3 converter any recording, the format that plays everywhere.

Drop WAV, M4A, AAC, OGG, Opus, FLAC or AIFF files and download MP3s at the bitrate you pick, a whole folder at once.

Drop audio files here or click to choose. MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, or the sound of a video. Several at once is fine.

Convert to Bitrate MP3, M4A and OGG Channels

Audio to MP3 converter at a glance

content.win converts audio a whole folder at a time, with no daily cap and no file-size wall.

Works with: MP3, WAV, M4A and AAC, OGG and Opus, FLAC, AIFF, and the sound of an MP4, MOV or WebM. Several at once.
Comes back as: MP3, WAV, M4A, OGG or FLAC, the full length, named after the original.
Runs: In your browser.
Limits: No daily limit and no cap on how many files.
Price: Free. No account, no watermark.

Drop the files in. Any mix of formats, a whole folder at once.
Pick a bitrate. 192 kbps is right for music; 128 kbps for speech; 320 kbps when the source is lossless and size does not matter.
Download the MP3s. The full length of each, named after the originals.

128 kbps: Speech, podcasts, voice notes. About 1 MB a minute.
192 kbps: Music for everyday listening. Hard to tell from the original on most speakers.
320 kbps: The most MP3 can hold. Worth it from a WAV or FLAC master, wasted on a file that was already lossy.

Which formats can I convert to MP3?

WAV, M4A and AAC, OGG and Opus, FLAC, AIFF, and the sound of an MP4, MOV or WebM video.

Does converting lose quality?

MP3 is lossy, so a little is removed each time. From a WAV or FLAC at 192 kbps or more, the difference is inaudible for most listeners.

Can I make the file mono?

Yes. Mono halves the size and is the right choice for a voice recording.

Is there a cap on how many files?

No. Drop the folder and one button downloads every MP3.