Convert MP3 to FLAC Online Free
MP3 is the most universally compatible lossy audio format for music and voice. FLAC is a lossless format that compresses audio without discarding any quality. FileConverter turns your MP3 into FLAC online in seconds - free, privacy-first, and with no software to install or account to create.
Convert MP3 to FLAC
FLAC is already selected. Add your MP3 file to start.
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Add a MP3 file above to start the conversion.
MP3 to FLAC changes the container to a lossless format for compatibility, though it cannot restore quality already lost in the MP3.
What changes when you convert MP3 to FLAC
FLAC is lossless, but converting a lossy MP3 cannot restore audio detail that was already discarded — the file simply grows in size without adding quality. This pair is useful mainly for compatibility with lossless workflows.
About the MP3 format
MP3 compresses audio to small sizes with quality that is more than good enough for most listening. It plays on every device and app, which is why it remains the default for music, podcasts, and voice recordings. In everyday use, MP3 is chosen for music libraries and playlists, podcasts and voice recordings and sharing audio that must play everywhere. It opens in every phone, browser, car stereo, and media player.
About the FLAC format
FLAC shrinks audio to roughly half the size of WAV while keeping bit-perfect quality, making it the favourite of audiophiles and archivists. Files are larger than MP3 but far smaller than uncompressed WAV. In everyday use, FLAC is chosen for high-fidelity music archives, audiophile listening and lossless backups of recordings. It opens in VLC, modern phones, and most desktop players.
MP3 vs FLAC
MP3 is best known for plays on essentially every device, while FLAC stands out for lossless quality at half the size of WAV. Choosing between them comes down to where the file needs to go next.
Common use cases
People convert MP3 to FLAC for jobs such as high-fidelity music archives, audiophile listening and lossless backups of recordings. It is especially common when a MP3 file arrives from one system but needs to work in another that standardises on FLAC.
When to convert MP3 to FLAC
Reach for MP3 to FLAC when your destination expects FLAC — for example high-fidelity music archives, audiophile listening and lossless backups of recordings. It is the right move when you receive a MP3 file but the app, website, or person you are working with cannot use it. Bear in mind that larger than MP3 or AAC, so keep your original MP3 if you might need it again.
How to convert MP3 to FLAC
- Upload your MP3 file to the converter at the top of this page - FLAC is already selected as the output.
- Check the size limit shown on this page, then drag and drop or browse for your file.
- Confirm FLAC is still the target format, or pick a different one from the grid.
- Start the conversion and download your FLAC file the moment it is ready.
Quality tips
Because FLAC preserves detail, use it when you plan to edit or archive the audio. For a lossy source there is no quality to gain, so this mainly buys you compatibility.
Platform compatibility
The MP3 to FLAC converter runs on Windows, macOS, Linux, Android, and iOS - anywhere with a modern browser, with no plugins or permissions required. Once exported, FLAC opens in VLC, modern phones, and most desktop players.
File size limits
Video/audio up to 2GB
Troubleshooting
- FLAC is lossless, but it cannot rebuild detail that MP3 already discarded. Expect a larger file at the same visible quality, not a sharper one.
- If the file exceeds the limit shown below, compress images, trim video, or split archives before retrying.
- If conversion fails, confirm the extension matches the real format — renaming a file alone does not change its contents.
- Converting a lossy file to a lossless format will not improve its sound quality.
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