Turn AAC audio files into FLAC. It is converted in your browser, so the file never leaves your device.
Drop AAC files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Drop AAC files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab.
Save the FLAC, or download everything as one ZIP if you converted several files.
The AAC to FLAC converter is part of this page and runs inside your browser. Your audio files are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
A raw AAC file has no container, so some players cannot seek in it or read its tags. FLAC keeps full quality at about half the size of WAV. AAC is at home in efficient audio for streaming and video soundtracks; FLAC is the usual choice for archiving music at full quality. FLAC cannot bring back detail that AAC compression already removed; it simply stores the result without further loss, in a larger file.
The defaults suit most files. Under Options you can trim the start and end.
The conversion uses your browser's own video and audio codecs (WebCodecs), with hardware acceleration where the device has it; the file is read from disk as it goes and can be up to 2 GB. Where the browser lacks a codec, the page falls back to the compatibility engine.
AAC was designed as the successor to MP3 and is the audio codec inside most MP4 videos and streaming services. A bare .aac file is the raw stream without a container, which some players handle poorly.
Opens in Most phones, browsers and media players
AAC converterFLAC compresses audio to roughly half the size of WAV without losing anything, like a ZIP for sound. It is the standard for lossless music collections. Apple's Music app is the notable holdout.
Opens in Android, Windows, VLC, most hi-fi players; Apple Music does not import it
FLAC converter| AACAAC audio | FLACFLAC audio | |
|---|---|---|
| Stands for | Advanced Audio Coding | Free Lossless Audio Codec |
| Type | Audio | Audio |
| Compression | Lossy | Lossless |
| Introduced | 1997, by the Moving Picture Experts Group | 2001, by Josh Coalson and the Xiph.Org Foundation |
| Opens in | Most phones, browsers and media players | Android, Windows, VLC, most hi-fi players; Apple Music does not import it |
| Best for | Efficient audio for streaming and video soundtracks | Archiving music at full quality |
| File extension | .aac, .adts | .flac |
No. The AAC to FLAC conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
No further quality is lost: FLAC stores the decoded audio exactly. It cannot restore what AAC compression already discarded, and the file will be larger.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the AAC file, press Convert and save the FLAC. There is nothing to install.
Yes. Files up to 2 GB are accepted. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.