Only Trusted Audio Converter
Drop voice notes, memos and songs. Get MP3, WAV or AIFF back, converted on this device with zero downloads and nothing uploaded. Every file gets a plain note on what the conversion does to its quality, before you run it.
Drop audio files here, or tap to choose
MP3, WAV, M4A, FLAC, OGG and Opus (WhatsApp voice notes) — whatever this browser can read.
192 kbps is the honest middle: speech is clear at 128, music holds together at 256 and up.
WAV and AIFF hold the sound exactly as decoded, so the file is big: about 10 MB a minute in CD quality.
Processed on this device: 0 · Uploaded: 0
Decoded here, encoded here, judged honestly
Your browser already knows how to read far more audio than it can write. This tool decodes each file with the browser's own reader, then writes MP3 (with the same encoder the rest of this site uses), WAV or AIFF from that decoded sound. Converting runs one file at a time, so a batch of twenty never holds twenty songs in memory at once. Nothing about the conversion is hidden: each row names the file's format and bitrate as read, and states what converting it will do (a bigger file with nothing gained, a first compression, a re-compression that costs a little) before you press anything.
Picking the right output
Sharing or playing anywhere: MP3 at 192 kbps. Feeding an editor or an archive: WAV at the original sample rate. Sending speech to a transcription service: MP3 at 128, or WAV at 16 kHz mono if it asks for that. A voice note you only need to hear on a computer: MP3 at 128 is plenty. And if a row says a conversion gains nothing, believe it: formats are containers for sound, and no container adds back what a smaller one threw away.
Questions
Why only MP3, WAV and AIFF out?
Because those are the formats a browser can honestly write. There is no built-in AAC, Opus or FLAC encoder in a web page, and tools that offer M4A out are either uploading your file to a server or recording it back in real time (a 45-minute podcast would take 45 minutes). We would rather offer three formats that work instantly than ten that need your file on someone else's computer.
Can I convert a WhatsApp voice note?
Yes. WhatsApp voice notes are Ogg Opus files (.opus or .ogg). Chrome, Edge and Firefox read them, so drop the note here and take an MP3. On an iPhone, Safari historically could not read Ogg files; save the note and convert it on a computer, or in Chrome on the phone, if Safari refuses it. The row will tell you plainly if your browser cannot read a file.
Does converting MP3 to WAV improve the quality?
No. An MP3 has already thrown away part of the sound. WAV stores what is left exactly, in a much bigger file. Convert MP3 to WAV only when a program demands WAV; convert WAV to MP3 when you want the small file. Every row here carries a note saying what its conversion does, before you run it.
Is my audio uploaded?
No. Decoding and encoding both happen in your browser, and nothing is sent anywhere. Unreleased music, interviews and private voice notes stay private. Close the tab and everything is gone.
How long can the files be?
MP3 output is capped at 60 minutes per file, which covers songs, memos and most episodes. WAV and AIFF have no time cap, but they run about 10 MB per minute in CD quality, so a one-hour WAV is roughly 600 MB. Convert one file at a time happens automatically: a big batch never holds every file decoded in memory at once.