Step 1: Supply your MP3 files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted FLAC files.
MP3 to FLAC Conversion FAQ
What does the MP3 to FLAC audio converter do?
+
MP3 is already lossy, so converting to FLAC preserves the existing audio without further degradation, but it cannot recover detail lost in the original encode. FLAC is right if you plan to edit and resave without compounding compression artifacts.
Will the sample rate and channel layout be preserved?
+
By default yes — stereo stays stereo, the original sample rate (44.1 kHz, 48 kHz, etc.) is carried through to the FLAC output.
Will the FLAC file be much larger than the source MP3?
+
Yes — lossless audio is typically 5-10x larger than lossy audio at perceptually equivalent quality. Plan for ~10 MB per minute for FLAC versus ~1 MB per minute for high-bitrate MP3.
Will the FLAC be larger than the MP3?
+
Yes — lossless containers store every byte. Expect the FLAC to be 3-8x the size of the MP3. The benefit is no further quality loss on editing or re-encoding.
Does converting MP3 to FLAC improve the audio quality?
+
No, and it is worth being blunt: nothing can. The MP3 already discarded detail during its original encode, and wrapping what remains in a lossless FLAC preserves exactly that — no more. The file gets several times larger and sounds identical. It is still the right move before editing, because FLAC will not add a second generation of artefacts when you export. FLAC gives you WAV fidelity at half the size, with proper metadata tags and embedded artwork, which is why it dominates lossless music libraries. MP3 is technically outclassed by AAC and Opus at every bitrate, cannot store more than two channels usefully, and always adds a small encoder delay.
What exactly is a FLAC file?
+
A container with the audio inside it, rather than the audio on its own. That extra layer is where the length, the seek index and whatever metadata the format defines are kept, so a player knows how long a FLAC is before decoding a single frame instead of scanning the whole file to find out. It also means the extension does not always settle what is inside: several containers of this kind are allowed to hold more than one sort of audio, which is why two FLAC files can behave differently while looking identical from outside. FLAC uses linear prediction plus Rice coding to reach roughly 50-60% of the original size while decoding back to bit-identical PCM.
Most of my MP3 files came from CDs — does that matter here?
+
Only in that the encode already happened once. An MP3 ripped from a disc was compressed at whatever bitrate the ripper was set to years ago, and that is the ceiling on everything downstream — converting cannot recover what the ripper discarded. If the discs are still on a shelf, re-ripping to a lossless format and encoding from that gives a genuinely better result than any conversion of the existing files. MP3 is MPEG-1 Audio Layer III, finalised in 1993, and still the most universally decodable audio format that exists.
Will the FLAC play in my car or on older hardware?
+
Often not. MP3 is decoded by essentially everything, including car head units and elderly players; FLAC needs software that knows the codec, which standalone hardware frequently does not have. If the destination is a car stereo or a portable player, that is a strong argument for staying on MP3. FLAC is still several times larger than a good lossy file, and Apple’s ecosystem only added support recently and grudgingly.
Is MP3 free to use and distribute?
+
Yes, without conditions worth worrying about. The specification is public, anyone can implement an encoder or decoder without asking or paying, and nobody can change those terms later — which is why it turns up in open-source tooling, in game engines and anywhere a licence negotiation would have killed the project. Converting away from it does not undo that; the files you already have stay exactly as usable as they were.
Is there a file-size limit when converting MP3 to FLAC?
+
Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several MP3 files to FLAC at once?
+
Yes. Drop or pick multiple MP3 files in one upload — the converter processes them in parallel and returns a ZIP of the FLAC results. There is no need to repeat the upload step per file.
What happens to my MP3 files after the conversion?
+
Uploaded files and FLAC outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
