Convert FLAC to M4A online

Your FLAC file is converted to M4A right here in your browser, using FFmpeg compiled to WebAssembly. Nothing is uploaded to us, the audio never leaves your device. Quality is preserved and the download is ready in seconds.

What is a FLAC file?

FLAC (Free Lossless Audio Codec) compresses audio the way ZIP compresses files: the data gets smaller (typically 50 to 60% of WAV size) but decodes back to exactly the original samples. Nothing is lost, ever.

FLAC is the archiving and audiophile standard: music collections, radio archives and oral-history projects use it to keep perfect masters at half the storage cost of WAV.

Why M4A?

M4A is the MPEG-4 audio container, almost always holding AAC-encoded audio. It is what an iPhone produces: Voice Memos, iTunes purchases and most Apple-ecosystem audio are M4A files.

Convert to M4A for the Apple ecosystem, or when you want noticeably better quality than MP3 at the same file size, AAC is MP3's designed successor and it shows at lower bitrates. FLAC playback support is broad but not total, iPhones handle it awkwardly, and some editors still prefer WAV, and the files remain far larger than any lossy format.

Frequently asked questions

Will converting FLAC to M4A lose quality?

You trade a little fidelity for a much smaller file. M4A is a lossy format, so detail the ear is least likely to miss is discarded during encoding, for speech and most listening the difference is inaudible at the high-quality settings this converter uses. Keep your original FLAC as the master and treat the M4A as the sharing copy.

Is it free?

Yes, completely, with no account and no watermark. The conversion runs on your own device, so it costs us nothing to let you use it. The only limit is file size: up to 50 MB, which is what a browser can hold in memory comfortably.

Do I need to install anything, or upload my file?

Neither. It runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio is never sent to us, which is also why it works on a slow connection, only the page downloads, not your file.

Need a transcript of the audio?

Autrans also transcribes audio in Nigerian English, Pidgin, Yoruba, Hausa, Igbo, French, and Spanish.