MP3 to FLAC Converter – Free Online

How to Convert MP3 to FLAC Online

Upload your MP3 file

Drag and drop your .mp3 file onto the page or click to browse. You can select several MP3 files at once to batch-convert them.

FLAC is preselected

The output format is already set to FLAC, so you can convert immediately. If you need to, adjust the audio codec, bitrate or sample rate in the settings panel first.

Convert and download

Click Convert. The FLAC file is processed on your own device; nothing is uploaded to a server. When it finishes, click Download to save it (or Download all to get a batch as a ZIP).

Why Convert MP3 to FLAC?

Converting MP3 to FLAC does not recover the detail the MP3 encoder discarded, but it does freeze the audio in a lossless container so future edits, conversions and library tools never degrade it again. It also lets FLAC-only players and archives accept the file.

The FLAC will be larger than the MP3, typically five to eight times, and the converter preserves your tags. Use it for archiving, not for improving sound.

Private by design: your MP3 file is converted on your own device and never uploaded.
FLAC preselected: the output format is already chosen, so it is a one-click conversion.
Batch friendly: convert several MP3 files in one go and download them as a ZIP.
No limits, no watermark: free for files of any size, with nothing stamped on the output.

MP3 vs FLAC

MP3 (MPEG-1 Audio Layer III): MP3 is the universal lossy audio format. It plays on every device made in the last twenty-five years and offers small files with good quality at 192 to 320 kbps. It is best for music players, podcasts, phones and sharing.

FLAC (Free Lossless Audio Codec): FLAC (Free Lossless Audio Codec) compresses audio to roughly half the size of WAV without discarding a single bit, so it decodes back to the identical original. It is best for lossless music libraries and audiophile listening.

In short: keep MP3 when the priority is music players, podcasts, phones and sharing, and switch to FLAC when the file is headed for lossless music libraries and audiophile listening. Need a different target? The full Audio Converter supports every format listed below.

MP3 to FLAC FAQ

Will MP3 to FLAC make the audio sound better?

No. FLAC preserves exactly what the MP3 contained. It only guarantees no additional loss from this point on.

Why is the FLAC file so much bigger?

FLAC stores the fully decoded PCM audio compressed losslessly, which cannot be as small as a lossy MP3.

Is this MP3 to FLAC converter free?

Yes. Converting MP3 to FLAC on MediaConverter.io is completely free, with no watermark, no sign-up and no daily conversion limit.

Are my MP3 files uploaded to a server?

No. The converter runs inside your browser using WebAssembly and WebCodecs, so your .mp3 file is read and converted on your own device. Nothing is uploaded, which keeps private recordings private and means there is no waiting in an upload queue.

Is there a file size limit for MP3 to FLAC?

No fixed limit. Because processing happens locally, the practical limit is your computer's memory and patience; multi-gigabyte MP3 files convert fine on a desktop browser. Very large files take longer on phones.

Will converting MP3 to FLAC reduce quality?

FLAC is a lossless format, so it stores exactly the audio decoded from your MP3 file. No additional quality is lost during the conversion.

Which browsers support the MP3 to FLAC converter?

Current versions of Chrome, Edge, Firefox and Safari on desktop all work. Chrome and Edge are fastest because they expose hardware-accelerated WebCodecs decoders.