Shrink FLAC files into compact AAC with the quality you choose. Free, fast and private: everything is converted in your browser.
Drop audio or video files here
or paste them, or click to choose — several files at once
Choose filesMP3, WAV, FLAC, OGG, M4A, AAC, OPUS, AIFF, WMA, APE, AMR, MP4 and more · up to 300 MB per file
The converter (about 30 MB) is downloaded once on first use and then cached. Your files never leave your device.
Drop FLAC files onto the converter, paste them, or click to choose. You can add many at once.
AAC is already selected. If you like, adjust the quality, sample rate or channels before or after adding files.
Each file is converted in your browser in seconds. Save them one by one, or all at once as a ZIP.
Free Lossless Audio Codec
Lossless compression for music lovers
FLAC compresses audio without discarding anything: once decoded, it is bit-for-bit identical to the original, yet takes roughly half the space of WAV.
Advanced Audio Coding
Efficient successor to MP3
AAC (Advanced Audio Coding) was designed to replace MP3 and is used by YouTube, Apple and digital radio. An .aac file is a raw AAC stream without an MP4 container.
Audio is converted by ffmpeg running inside your browser. Your files never reach a server.
Queue up to 50 files and download them one by one or together as a ZIP.
Set the bitrate, bit depth, sample rate and channels — or simply keep the sensible defaults.
Add your FLAC files to the converter above. AAC is already selected as the output, so conversion starts right away. When a file is ready, click Download, or use Download all to get a ZIP.
AAC is a lossy format, so some inaudible detail is discarded to make the file much smaller. At 192 kbps or more, hardly anyone can hear the difference. Keep your FLAC original if you want a perfect archive.
192 kbps is transparent for most music and 128 kbps is plenty for speech. Choose M4A instead if you want cover art and tags to be kept.
No. The FLAC to AAC conversion runs entirely in your browser using ffmpeg compiled to WebAssembly. Your files are never sent to a server, so even private recordings stay on your device.
Yes. Add up to 50 files; they are converted one after another, and you can download each AAC file separately or all of them together as a ZIP archive.