Convert 오디오 to FLAC
Convert 오디오 to FLAC right in your browser. Your file is not uploaded to a server.
How to use it
- Drag your .mp3 .m4a .aac .ogg .opus .flac .wav .aiff .webm files onto the area above, or press "Choose files".
- If options are shown, set them as you like. They appear below the file list.
- Press "Convert". The conversion runs on your device, shows its progress and can be cancelled at any time.
- Press "Download" next to a result. With several results, "Download all as ZIP" gets them in one go.
The formats involved
오디오 .mp3 .m4a .aac .ogg .opus .flac .wav .aiff .webm
An audio file is a file that holds sound. Formats such as MP3, WAV, FLAC and OGG differ in how they compress it.
FLAC .flac
FLAC is a lossless audio format that compresses sound so it can be restored exactly. RFC 9639 covers 1 to 8 channels, 1 to 1048575 Hz and 4 to 32 bits, and STREAMINFO holds an MD5 checksum of the unencoded audio. Its media type is audio/flac.
What changes in this conversion
- Tags (title, artist, cover art) are not copied to the result.
- FLAC is lossless: decoding the result gives exactly the same sample values as the input (checked in our tests against two independent decoders, including the MD5 stored in the file). Source files that were already lossy stay as they are - they just become bigger.
Limits and things to watch for
- The file size that can be processed depends on your device. The limit for your device is shown in the drop area, and files above it are refused with a message.
- FLAC is written with 16 or 24 bits, fixed predictors and Rice coding: files are valid and lossless but usually a little larger than those of the reference encoder. Tags are not written.
- The browser decides which of MP3, M4A/AAC, Ogg Vorbis and WebM it can decode. WAV, AIFF and FLAC are read by our own code and wasm decoders on every browser.
- Ogg Opus is decoded by a WebAssembly decoder at 48 kHz. Ogg Vorbis is not covered by it and depends on the browser.
- Used only when the browser cannot decode an MP3 file.
- Decodes FLAC up to 24 bits exactly; other depths are untested here.
FAQ
Is my file uploaded to a server?
No. Conversion happens only inside this browser, and file names, contents and results are not sent to our servers. Some converters download their conversion program (code) the first time you use them; your files are not sent then either. See the privacy page for details.
Can I convert many files at once?
Yes. Select several files and they are processed one after another; save the results one by one or all at once as a ZIP. How much can be handled at once depends on your device memory and is shown on the page.
How do I know the FLAC file is intact?
FLAC files store an MD5 checksum of the unencoded audio in the STREAMINFO block; our encoder writes it and the tests compare it with an independently computed MD5 of the decoded samples.
Why is there a length limit for audio files?
Everything is decoded to 32-bit floating-point samples in your browser's memory (about 21 MB per minute of 44.1 kHz stereo). Files that would need more than about 60 / 120 / 400 million samples (phone / tablet / computer) are refused with a message instead of crashing the tab. These limits are proposals and were not measured on real phones.
Licences and the software used
This converter loads an LGPL-licensed library as a separate, unmodified file. The licence texts, the source link and how to replace the file are on the open-source licences page.
Programs this converter downloads and uses: ogg-opus-decoder 1.7.5 (MIT), mpg123-decoder 1.0.3 (MIT (+mpg123 LGPL-2.1)), @wasm-audio-decoders/flac 0.2.11 (MIT) · Open-source licenses
Sources and check date
- Web Audio API (W3C) - BaseAudioContext.decodeAudioData()
decodeAudioData: the result may be sample-rate converted ("after possibly performing sample-rate conversion") · 2026-11-10 - IANA Media Types: audio (registry)
audio/mpeg [RFC 3003], audio/mp4 [RFC 4337], audio/ogg [RFC 5334, RFC 7845], audio/opus [RFC 7587], audio/flac [RFC 9639], audio/aac. There is no audio/wav, audio/vnd.wave, audio/aiff, audio/midi or audio/webm entry (audio/midi-clip, audio/rtp-midi, audio/sp-midi exist). · 2026-11-10 - RFC 9639 - Free Lossless Audio Codec (FLAC)
Section 1 (1-8 channels, 1-1048575 Hz, 4-32 bit); STREAMINFO: MD5 checksum of the unencoded audio data · 2026-11-10 - RFC 7845 - Ogg Encapsulation for the Opus Audio Codec
Granule position: always counted at a 48 kHz decoding rate · 2026-11-10
Date we opened the original documents ourselves: 2026-11-10. Specifications can change, so read the original again before anything important.