Audio Converter · MP3 · WAV · OGG · FLAC

How to convert audio online (free)

1. Drop your file onto the box above — any common audio format, or a video if you want its soundtrack.
2. Pick an output format and, for lossy formats, a bitrate. Optionally set a start time (like 1:23) and a length in seconds to trim.
3. Click Convert. The result previews on the page with a player and downloads when you click save.

Extract audio from video

Drop an MP4, MOV, WebM or MKV straight onto the tool and choose MP3 (or any other format). FFmpeg reads the audio track and discards the video stream — the fastest way to turn a lecture recording, interview or music video into a listenable file.

Which format should I pick?

• MP3 — plays on literally everything. The safe default for sharing.
• M4A (AAC) — slightly better quality than MP3 at the same bitrate; native on Apple devices.
• Opus — the most efficient modern codec; excellent for voice at low bitrates. Used by WhatsApp, Discord and YouTube.
• OGG (Vorbis) — open format, common in games and on Linux.
• FLAC — lossless compression, roughly half the size of WAV with identical sound. Best for archiving.
• WAV — uncompressed PCM. Big files, but universally accepted by editors and DAWs.

Real FFmpeg, running in your browser

This tool ships FFmpeg compiled to WebAssembly, so conversion happens inside your browser tab. Your audio is never uploaded: nothing to leak, cache on a server, or delete later. The first run downloads the engine once, which the browser then caches.

Does converting lose quality?

Converting to FLAC or WAV never loses anything. Converting between lossy formats (say MP3 → OGG) re-encodes and discards a little more detail each time — usually inaudible at 192 kbps and up, but if you have the original lossless file, convert from that.

Is there a file size limit?

Only your device's memory. Albums and hour-long recordings are fine on a typical laptop; conversion runs at many times real-time speed.