Free MP3 to FLAC
Converter Online
Convert MP3 to FLAC online free. Archive your MP3 audio in lossless FLAC format instantly in your browser — no upload, 100% private. FLAC is the gold standard for music preservation and long-term archiving.
Upload Your Audio
Drag and drop or click to browse
or drag & drop audio files here
Supports WAV, MP3, FLAC, OGG, AAC, M4A
Audio Conversions
Countries Served
Browser Privacy
Forever Free
100% Private MP3 to FLAC Conversion
Convert MP3 to FLAC entirely in your browser using FFmpeg.wasm. Your audio files are never uploaded to any server — perfect for personal music archives, unreleased recordings, and confidential audio content.
Best Format for Music Archiving
FLAC is the gold standard for music preservation. Unlike MP3, FLAC is lossless and open — your archive will be perfectly playable decades from now, with no format decay or codec lock-in.
Fast MP3 to FLAC Conversion Online
No upload queues, no waiting. Convert MP3 to FLAC directly in your browser in seconds. Works on any device — Mac, Windows, iPhone, Android — without installing any software.
Full Metadata Preservation
Our converter automatically transfers your MP3 ID3 tags (title, artist, album, track number) to FLAC Vorbis comment tags — keeping your music library organized after conversion.
How to Convert MP3 to FLAC Online Free
Archive your MP3 audio in lossless FLAC format in 3 simple steps
Upload Your MP3 File
Select your MP3 audio file from your device. Our free online MP3 to FLAC converter also accepts WAV, FLAC, AAC, OGG, and M4A audio formats.
Choose FLAC Settings
Select FLAC as output format. You can also choose sample rate and channel output. FLAC compression level affects encoding speed — not audio quality, which is always lossless.
Convert MP3 to FLAC & Download
Click convert and download your FLAC file instantly. The entire MP3 to FLAC conversion runs in your browser — completely free and 100% private.
Best Free MP3 to FLAC Converter Online
Unlike other online converters that upload your audio files to remote servers, our MP3 to FLAC converter processes everything locally in your browser with FFmpeg.wasm. Get faster conversion, complete privacy, and full metadata preservation.
MP3 files stay on your device — no server transfer.
FLAC output is future-proof, open-source, and losslessly stored — the best container for your audio archive.
| Feature | Our Tool | Others |
|---|---|---|
| 100% Browser-based (No Upload) | ||
| Instant MP3 to FLAC Conversion | ||
| Unlimited MP3 File Size | ||
| Forever Free MP3 to FLAC Converter | ||
| No Software Installation Required | ||
| Lossless FLAC with Full Tag Support | ||
| MP3, WAV, AAC, OGG, FLAC Output |
MP3 to Audio Format Support
Convert MP3 and other audio formats to FLAC, WAV, MP3, AAC, or OGG
Input Audio Formats
Output Audio Formats
MP3 to FLAC Converter Reviews
Trusted by archivists, audiophiles, and music collectors worldwide
Music Archivist
"I'm converting my entire MP3 library to FLAC for long-term archiving. This tool does it instantly in the browser without sending my files anywhere. Exactly what an archivist needs."
Hi-Fi Enthusiast
"My DAC and streamer only support FLAC. This MP3 to FLAC converter lets me add older MP3 purchases to my lossless library seamlessly. The metadata transfer is perfect."
Home Server Admin
"My Jellyfin server is FLAC-first. Converting MP3 files to FLAC before adding them keeps my library consistent. This browser-based tool is the most private way to do it."
Music Archivist
"I'm converting my entire MP3 library to FLAC for long-term archiving. This tool does it instantly in the browser without sending my files anywhere. Exactly what an archivist needs."
Hi-Fi Enthusiast
"My DAC and streamer only support FLAC. This MP3 to FLAC converter lets me add older MP3 purchases to my lossless library seamlessly. The metadata transfer is perfect."
Home Server Admin
"My Jellyfin server is FLAC-first. Converting MP3 files to FLAC before adding them keeps my library consistent. This browser-based tool is the most private way to do it."
Music Archivist
"I'm converting my entire MP3 library to FLAC for long-term archiving. This tool does it instantly in the browser without sending my files anywhere. Exactly what an archivist needs."
Hi-Fi Enthusiast
"My DAC and streamer only support FLAC. This MP3 to FLAC converter lets me add older MP3 purchases to my lossless library seamlessly. The metadata transfer is perfect."
Home Server Admin
"My Jellyfin server is FLAC-first. Converting MP3 files to FLAC before adding them keeps my library consistent. This browser-based tool is the most private way to do it."
Music Archivist
"I'm converting my entire MP3 library to FLAC for long-term archiving. This tool does it instantly in the browser without sending my files anywhere. Exactly what an archivist needs."
Hi-Fi Enthusiast
"My DAC and streamer only support FLAC. This MP3 to FLAC converter lets me add older MP3 purchases to my lossless library seamlessly. The metadata transfer is perfect."
Home Server Admin
"My Jellyfin server is FLAC-first. Converting MP3 files to FLAC before adding them keeps my library consistent. This browser-based tool is the most private way to do it."
Music Collector
"I bought hundreds of MP3 downloads before FLAC was common. Converting them to FLAC containers makes my archive future-proof. The tool is instant and needs no installation."
Audiophile
"I know MP3 to FLAC doesn't add quality — but FLAC is the right archival container. This converter preserves my tags perfectly and processes everything locally. No trust issues."
Audio Librarian
"Managing an audio library means consistent formats. Converting all MP3 inputs to FLAC with this tool gives me a uniform lossless archive. Fast, private, and free."
Music Collector
"I bought hundreds of MP3 downloads before FLAC was common. Converting them to FLAC containers makes my archive future-proof. The tool is instant and needs no installation."
Audiophile
"I know MP3 to FLAC doesn't add quality — but FLAC is the right archival container. This converter preserves my tags perfectly and processes everything locally. No trust issues."
Audio Librarian
"Managing an audio library means consistent formats. Converting all MP3 inputs to FLAC with this tool gives me a uniform lossless archive. Fast, private, and free."
Music Collector
"I bought hundreds of MP3 downloads before FLAC was common. Converting them to FLAC containers makes my archive future-proof. The tool is instant and needs no installation."
Audiophile
"I know MP3 to FLAC doesn't add quality — but FLAC is the right archival container. This converter preserves my tags perfectly and processes everything locally. No trust issues."
Audio Librarian
"Managing an audio library means consistent formats. Converting all MP3 inputs to FLAC with this tool gives me a uniform lossless archive. Fast, private, and free."
Music Collector
"I bought hundreds of MP3 downloads before FLAC was common. Converting them to FLAC containers makes my archive future-proof. The tool is instant and needs no installation."
Audiophile
"I know MP3 to FLAC doesn't add quality — but FLAC is the right archival container. This converter preserves my tags perfectly and processes everything locally. No trust issues."
Audio Librarian
"Managing an audio library means consistent formats. Converting all MP3 inputs to FLAC with this tool gives me a uniform lossless archive. Fast, private, and free."
Free MP3 to FLAC Converter Online — Convert MP3 to Lossless Audio
Need to convert MP3 to FLAC online free? Our browser-based MP3 to FLAC converter archives your compressed MP3 audio in lossless FLAC format instantly — no upload required. Whether you're building a music archive, converting for FLAC-compatible devices, or consolidating your audio library in an open format, do it privately and in seconds.
