Convert audio between formats

Turn recordings into the format a player, phone or editor expects. Drop one file or a full batch and collect the results together.

Processed on our server Free, no account needed

Drop files or a folder

    Updated

    To convert audio, drop the file, choose a target format and download the new version, usually a few seconds later. Opus, OGG, WMA, M4A, AAC, MP3, FLAC and WAV all work as input, and the output can be MP3, AAC, M4A, Opus, OGG, WAV or FLAC.

    The conversion runs on our servers, not in your browser. Each file reaches us in Germany over an encrypted connection, and we delete it automatically within two hours.

    Lossless or lossy: decide this first

    Every audio format belongs to one of two families. Lossless formats, WAV and FLAC, hold the full recording and produce large files. Lossy formats, MP3, AAC, M4A, OGG and Opus, leave out sounds that listeners are unlikely to notice, which makes their files far smaller.

    The family also decides what happens to quality. Converting into WAV or FLAC keeps the decoded audio exactly as it is. Converting into a lossy format removes some detail, and each further lossy step removes a little more, so work from the best copy you have. The reverse does not repair anything: an MP3 turned into FLAC is the MP3's sound, now stored without further loss.

    Our settings for each output

    Each format gets fixed settings chosen for it, so there is nothing to tune:

    • MP3: variable bitrate at quality level 2, usually 170 to 210 kbps. Most listeners cannot tell it apart from the original, and every player handles it.
    • AAC and M4A: 192 kbps. At an equal file size, AAC holds slightly more quality than MP3.
    • Opus: 128 kbps, which already sounds excellent. It is the most efficient lossy codec and a strong choice for speech and the web, though some older players and car stereos cannot play it.
    • OGG: the Vorbis codec at quality 5, roughly 160 kbps, often found in games and open-source software.
    • WAV: uncompressed 16-bit PCM, which nearly every audio editor opens.
    • FLAC: lossless like WAV but about half the size, which makes it the sensible format for archiving music.

    Converting a whole library

    Drop several files or a complete folder and pick one output format for all of them. Without an account, a batch holds up to 5 files of up to 50 MB each, within 20 server jobs a day. A free account raises that to 10 files per batch and 50 jobs a day. Pro handles batches of up to 500 files and files up to 500 MB, with no daily allowance. When the batch finishes, download the files one at a time or everything as a single ZIP.

    For a bigger job, such as turning a FLAC music collection into MP3 for a phone, the pipeline builder runs the conversion across the whole folder. Pipelines are free to try on up to 3 files. Past that, use Pro or credits: one credit covers 25 files, and credits never expire.

    How to convert audio files

    1. Drop your audio files, or a folder that holds them, onto the page.
    2. Select the format the files should end up in.
    3. Click Convert and give each file a few seconds.
    4. Save the results one by one or as a single ZIP.

    FAQ

    Which format should a podcast feed use?

    MP3. Every podcast app plays it, which is why feeds still standardize on it.

    What should I hand to an audio editor?

    WAV. Any editor opens it, and saving it repeatedly costs no quality.

    Do artist and title details come along?

    The common tags usually carry over, but a few can drop out between formats. Check them in your player afterwards.

    Can I get the sound out of a video file?

    This tool takes audio files only. For video, use extract audio from video or MP4 to MP3.