Convert audio — batch, fast, and nothing leaves your device
Drop up to 10 files, pick the output format and quality, and convert. This is real ffmpeg compiled to WebAssembly running in your browser — the same engine studios script, minus the terminal.
Nothing is uploaded — your audio never leaves your device.
Converting is table stakes. The studio does the whole job.
AudioEncode in the studio adds batch metadata, album workflows, audio-to-video, and a permanent library that remembers every file. Sign up and bring your catalog: 3 full packs free.
A real converter, not an upload form
Most "online converters" are upload forms in front of a server running ffmpeg. This one skips the middleman: the same ffmpeg engine is compiled to WebAssembly and runs inside your browser tab. That's why there's no queue, no file-size upsell, no "your download is ready" email — and why a private demo or an unreleased master can be converted here without ever existing anywhere but your machine.
Picking a format is simpler than the internet makes it: MP3 at high quality for anything that needs to play everywhere; WAV or FLAC when you'll edit or archive it; Opus when small size matters more than universal support. When in doubt, convert a copy — the original never changes.
Frequently asked questions
How do I convert audio without uploading it?
This converter runs ffmpeg — the industry-standard audio engine — compiled to WebAssembly inside your browser. Your files are read locally, converted locally, and downloaded locally. Nothing touches a server, which also means no file-size games or queues.
What formats can it convert between?
In: almost anything ffmpeg can read — MP3, WAV, FLAC, OGG, M4A/AAC, Opus, AIFF, WMA and more. Out: MP3, WAV, FLAC, OGG, AAC, and Opus, with bitrate or quality presets per format.
Why does it download a 10 MB engine first?
That's ffmpeg itself. It loads once, on your first convert — never on page load — and your browser caches it for a year, so every later visit converts instantly, even offline on some browsers.
Is there a file limit?
Ten files per batch, 80 MB per file — a courtesy ceiling to keep your browser comfortable, not a paywall. Batches download as a single ZIP; single files download directly.
Will converting MP3 to WAV improve the quality?
No — a WAV made from an MP3 is just the MP3's data in a bigger box. Converting only preserves quality downward or sideways; it can never restore what a lossy encode removed. Check any file's real quality with our MP3 Quality Checker.