MP3 to FLAC Converter

AUTO-DELETE/Files are processed on our server and deleted as soon as conversion finishes.

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How to Convert MP3 to FLAC Online

This tool takes a MP3 file, processes it with FFmpeg on DownloadVideo.vn servers and returns a FLAC file.

MP3 is lossy while FLAC stores data exactly. The FLAC file will be larger but not better: detail discarded by MP3 cannot be restored.

Property	MP3	FLAC
Full name	MPEG-1 Audio Layer III	Free Lossless Audio Codec
Introduced	Fraunhofer / MPEG, 1993	Xiph.Org Foundation, 2001
Compression	lossy	lossless
Strengths	plays everywhere: phones, cars, speakers, browsers; about 1 MB per minute at 128 kbps	lossless: identical to the source after decoding; typically 50–70% of the size of WAV
Limitations	lossy: removed detail cannot be recovered; less efficient than AAC or Opus at the same bitrate	older iPhones/iTunes and some car stereos do not play it

On September 25, 2026 we ran the tool on our production server with a sample file: 10 seconds of 44.1 kHz stereo audio (MP3 192 kbps), 236 KB.

Result: 236 KB → 1,006 KB, processed in 1.3 s. Output: FLAC audio at 44.1 kHz stereo.

Real sizes depend on your content (how complex the picture and sound are, and the length); the figures only show the order of change.

The tool always re-encodes the picture and sound, even when the source codec would already fit the target format.
Up to 500 MB per file; a conversion that runs longer than 10 minutes is cancelled.
The file is sent to our server for conversion and deleted as soon as processing ends, including when it fails.

No. FLAC only stores exactly what is left in the MP3; what was lost when the MP3 was compressed does not come back. The file just gets larger.

With our sample file: 236 KB → 1,006 KB. Your file may differ depending on its content.