Audio Converter — MP3, WAV, OGG, M4A, FLAC, AAC
Drop a file, pick the output format and bitrate, and download. Runs ffmpeg.wasm in your browser — your audio never leaves your device.
Drop an audio file here
MP3, WAV, OGG, M4A, FLAC, AAC
About this tool
WRRK's audio converter uses ffmpeg.wasm — the FFmpeg engine compiled to WebAssembly so it runs entirely in your browser. The first conversion downloads ~30 MB of WASM (cached for subsequent uses), then every file you convert is processed locally. No uploads, no servers, no telemetry.
Pick the output thoughtfully: MP3 is the universal compatibility pick; AAC (M4A) sounds slightly better than MP3 at the same bitrate and is native to Apple Music and most streaming; OGG (Vorbis) is the royalty-free open-source choice; FLAC is fully lossless and roughly half the size of WAV; WAV is uncompressed PCM that everything can read but is the largest. Bitrate matters for lossy formats only — 192 kbps is transparent for most listeners on most material; 320 kbps is the maximum and worth it for music you'll keep long-term. Going lossless-to-lossless preserves every sample bit-for-bit.
How to convert (5 steps)
- Drop your audio. Add an MP3, WAV, OGG, M4A, FLAC, or AAC file.
- Pick output format. Choose the format you want — MP3 for compatibility, FLAC for lossless, OGG for open-source, M4A/AAC for Apple devices.
- Pick bitrate. Lossy formats let you pick 128/192/256/320 kbps. 192 kbps is transparent for most listeners; 320 kbps is the maximum.
- Convert. Click 'Convert'. First run downloads the FFmpeg WASM engine; subsequent conversions start immediately.
- Download. Save the converted file to your device.
Use cases
- Convert iPhone voice memos (M4A) to MP3 for email or web upload
- Re-encode a podcast WAV master into a 128 kbps MP3 for distribution
- Turn FLAC tracks into OGG Vorbis for an Android music app
- Convert a YouTube-extracted OGG into M4A for iTunes
- Down-bitrate music for phone storage savings
- Make a WAV master from FLAC for DAW import
Frequently asked questions
+−Are my audio files uploaded to a server?
No. Conversion runs through ffmpeg.wasm — FFmpeg compiled to WebAssembly that executes inside your browser. Your audio file is never uploaded; it stays on your device the entire time.
+−Does this support FLAC and other lossless formats?
Yes. FLAC, WAV, ALAC (in M4A), and Apple Lossless inputs all decode correctly. You can also output to FLAC or WAV for a lossless conversion path. Bitrate controls only apply to lossy formats (MP3, OGG, AAC).
+−Can I do a true lossless conversion?
Yes — converting between lossless formats (e.g. FLAC → WAV, WAV → FLAC) is bit-perfect. Going from a lossy source (MP3) to a lossless target (FLAC) doesn't recover the original audio; the file just becomes lossless from that point forward.
+−Is there a file size limit?
Practically, your browser's RAM limits you to ~1–2 GB. Audio files are usually small (a 60-minute MP3 is ~50 MB), so almost any single track works. Very long uncompressed WAV files (multiple GB) may run out of memory on phones.
+−Will quality be preserved?
Lossless to lossless: yes, identical. Lossy to lossy at the same or higher bitrate: nearly identical (one re-encode generation). Lower bitrate output will sound worse — that's the trade for smaller files. We default to 192 kbps which is transparent for most listeners.
+−Does this work on mobile browsers?
Yes — Safari iOS 16+, Chrome Android, and most modern mobile browsers can run ffmpeg.wasm. Phone CPUs convert a 5-minute MP3 in 5–10 seconds; longer files take proportionally longer.
+−Why is the first conversion slower?
On first use, your browser downloads the FFmpeg WebAssembly engine (~30 MB). It's cached after that, so the next conversion starts immediately. The progress bar shows the download.
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