Convert Audio & Video to FLAC Online — Free Lossless Converter
This free online FLAC converter lets you turn audio and video files from a wide range of formats into Free Lossless Audio Codec (FLAC) — preserving every detail of the original sound without any quality loss.
What is FLAC?
FLAC (Free Lossless Audio Codec) is an open, royalty-free audio format that compresses audio data without discarding any information. Unlike MP3 or AAC, which reduce file size by permanently removing audio data the encoder deems inaudible, FLAC uses lossless compression: the decoded audio is bit-for-bit identical to the original source. Developed by the Xiph.Org Foundation and released in 2001, FLAC is now widely supported by media players, hi-fi streamers, smartphones, and DACs.
A typical FLAC file is 40–60% smaller than an uncompressed WAV or AIFF at the same quality, and it supports metadata tags (artist, album, artwork), multiple sample rates up to 655 kHz, and bit depths up to 32 bits.
Why convert to FLAC?
FLAC is the go-to format whenever audio quality must not be compromised. Common reasons to convert include:
- Archiving music collections — create a permanent, lossless master copy of CDs or high-resolution downloads.
- Hi-fi and audiophile listening — FLAC is natively supported by most network streamers, DACs, and Android devices.
- Audio editing workflows — working in lossless avoids generation loss when re-encoding after edits.
- Replacing lossy sources — if you have a high-bitrate source (e.g. a video soundtrack or WAV export), FLAC preserves it compactly.
- Streaming and storage balance — smaller than WAV/AIFF yet identical in quality, making it efficient for large libraries.
Supported input formats
The converter accepts a broad range of audio and video source formats, including MP3, AAC, WAV, OGG, WMA, M4A, AIFF, OPUS, RA, MP2, ALAC, and many common video containers such as MP4, MKV, AVI, and MOV. You can upload a file from your device or supply a direct remote URL — no software installation needed.
Frequently asked questions
Is this FLAC converter free to use?
Yes, the converter is completely free. No account or subscription is required to convert files. If you create a free account, you can opt in to receive an email notification when your conversion is finished.
Will converting to FLAC improve the quality of my MP3?
No. FLAC is lossless, meaning it preserves whatever audio information exists in the source file exactly. If the source is already a lossy format like MP3, converting it to FLAC will not restore the audio data that was discarded during the original encoding — the FLAC file will simply be a lossless copy of that lossy audio.
What happens to my uploaded files after conversion?
Files are processed on the server solely to perform the conversion and are deleted automatically afterwards. They are not stored, shared, or used for any other purpose.
Can I convert a video file to FLAC to extract its audio?
Yes. You can upload common video formats such as MP4, MKV, or AVI and the converter will extract the audio track and encode it as FLAC, discarding the video stream.
How does FLAC compare to WAV in terms of quality and file size?
Both FLAC and WAV are lossless and produce identical audio on playback. The key difference is size: FLAC applies lossless compression and is typically 40–60% smaller than an equivalent WAV file, while also supporting embedded metadata tags that WAV handles poorly.