Convert your .mp3 files to .flac format online. No software to install.
Pro plan required (from €4.99 / $4.99/month).
Drag and drop your .mp3 file or click to browse.
Select FLAC as your output format.
Click Convert and download your .flac file.
While converting MP3 to FLAC will not recover audio data lost during the original compression, it creates a lossless container that prevents further degradation. This can be useful for archival or when your workflow requires lossless input files.
MP3 (MPEG Audio Layer III, introduced in 1993) uses Lossy (psychoacoustic model + MDCT) compression. FLAC (Free Lossless Audio Codec, introduced in 2001) uses Lossless (linear prediction + Rice coding) compression. MP3 browser support: Universal. FLAC browser support: All modern browsers (Chrome, Firefox, Edge; Safari 11+).
Converting from MP3 (lossy) to FLAC (lossless) will not recover quality that was lost during the original MP3 compression. The conversion preserves the current state of the file without further degradation. The resulting FLAC file will be larger than the MP3 original.
Typical MP3 file size: A 4-minute song at 192 kbps: ~5.5 MB; at 320 kbps: ~9.2 MB. Typical FLAC file size: A 4-minute song at 44.1 kHz/16-bit: ~20-30 MB. The FLAC output will be larger than the MP3 input because lossless compression cannot match the compression ratios of lossy formats.
FLAC compression level (0-8) only affects encoding speed and file size, not audio quality — all levels produce bit-identical audio. Level 5 is a good default balance. Levels 6-8 save marginal space at significantly slower encoding speeds.
Pro plan required (from €4.99 / $4.99/month). No watermarks.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Your file is sent over an encrypted connection to our provider CloudConvert, which converts it and deletes it after the conversion, within 24 hours at most. Details in our Privacy Policy.
Convert files from any device: desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .flac file maintains the best possible quality. No unnecessary compression or quality loss.
Audio conversion requires a Pro account. See pricing, from €4.99 / $4.99/month
No. Audio conversions need a Pro plan (from €4.99 / $4.99/month), with 100 audio or 20 video conversions a month.
It depends on the file size and on the queue at our provider. Small files usually take a few seconds.
Your file is sent over an encrypted connection to our provider CloudConvert, which converts it and deletes it after the conversion, within 24 hours at most. Details in our Privacy Policy.
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.