How to use Audio converter
- 1
Add audio or video
Drop up to 3 files of up to 500 MB and 10 minutes — MP3, WAV, M4A, FLAC, OGG, Opus, AIFF, WMA, AMR or any video.
- 2
Pick the format
Choose MP3, M4A, WAV, FLAC, OGG, Opus, AAC or AIFF. A short note explains what each one is best for.
- 3
Set the quality
Choose a bitrate (MP3 also offers VBR from V0 to V6), sample rate, stereo or mono, and optionally even out loudness.
- 4
Convert and save
Edit title and artist per file if needed, press Convert, then download each file or all of them as a ZIP.
Limits and Pro
Up to 3 files per batch, each up to 500 MB and 10 minutes long.
Pro converts batches of up to 500 files, with recordings of up to 4 GB and 10 hours. See Pro
About Audio converter
Audio converter re-encodes sound files into the format a device or app expects, and pulls the soundtrack out of videos. Lossy outputs are MP3 (192 kbps by default, constant or LAME VBR), M4A and raw AAC (160 kbps), OGG Vorbis (160 kbps) and Opus (128 kbps); lossless outputs are WAV and AIFF with 16-bit PCM, and FLAC, which is typically about half the size of WAV with identical sound. When the original stream already fits the new container, such as AAC audio from a phone video going into M4A, it is copied without re-encoding, and the row says so.
You can resample to 48, 44.1, 32, 24, 22.05, 16 or 8 kHz, mix stereo down to mono for voice recordings, and normalise loudness to −16 LUFS following EBU R128, which evens out podcasts and lecture recordings that are too quiet or uneven. Title and artist tags are copied by default and can be edited per file before converting; other tags such as album art may not survive every format change.
Common jobs: WAV recordings into MP3 for sharing, M4A voice memos into MP3 for old players and car stereos, FLAC into M4A for an iPhone, WMA files from an old collection into something modern, and a lecture's audio taken from an MP4. Converting a lossy file such as an MP3 into WAV or FLAC makes it bigger but not better, and audio protected by DRM, like some iTunes and streaming downloads, can't be read.
Privacy
Decoding and encoding run in this tab: through WebCodecs and mediabunny, with LAME, AAC and FLAC encoders compiled to WebAssembly and served from this site, or through ffmpeg.wasm in a Web Worker for formats and loudness normalisation the browser can't handle. No audio is uploaded. ffmpeg's 31 MB core comes from the jsDelivr CDN only when needed, is cached, and the request contains no audio.
Features
Eight output formats
MP3, M4A, WAV, FLAC, OGG, Opus, AAC and AIFF, from any audio or video input.
Copy when possible
Streams that already fit the new container are copied instantly, with no quality loss.
Loudness normalisation
Even out quiet or uneven recordings to −16 LUFS (EBU R128).
Edit tags
Keep or change the title and artist of each file before converting.