Filenary

MP3 to FLAC Converter

Convert MP3 audio files to FLAC audio right in your browser — free, private and with no size limit.

Drop your file here

or click to browse

Choose File

On first use, a ~30 MB conversion engine is downloaded to your browser (one time only).

This file is processed in your browser and never uploaded to a server.

How to convert MP3 to FLAC

  1. 1Drop your MP3 file into the box above, or click to choose it from your device.
  2. 2Click Convert. The conversion runs locally in your browser — nothing is uploaded.
  3. 3Download your new FLAC file as soon as it's ready.

Why convert MP3 to FLAC?

MP3 is lossy, so some audio detail is lost compared with the original recording. FLAC keeps perfect CD-quality sound at around half the size of WAV.

Why people make this conversion

Note: this preserves current quality but cannot restore detail MP3 already discarded. Have the original? Archive that instead.

The size math: MP3 vs FLAC

At typical quality a minute of content weighs about 1.4 MB as MP3 and 5.5 MB as FLAC — after conversion your FLAC file comes out about 3.9× larger.

What is MP3?

MP3 is the most popular audio format. It compresses music and speech into small files that play on any device.

  • MIME type: audio/mpeg
  • Standardized: 1993 (MPEG-1 Audio Layer III)
  • Common bitrates: 128–320 kbps
  • Plays on essentially every device made since 1993

What is FLAC?

FLAC is a lossless audio format that compresses audio to about half the size of WAV without losing any quality.

  • MIME type: audio/flac
  • Released: 2001 by Xiph.Org Foundation
  • Lossless: shrinks WAV by 40–60% without losing a sample
  • The audiophile archiving standard

Frequently asked questions

Is this MP3 to FLAC converter free?
Yes, it's completely free with no sign-up, no watermark and no daily limits.
Are my MP3 files uploaded to a server?
No. The conversion happens entirely inside your browser, so your files never leave your device.
Is there a file size limit?
Filenary sets no limit — even files over 1 GB work. The only practical limit is your device's memory.
Will converting MP3 to FLAC reduce the quality?
FLAC is a lossless format, so no extra detail is thrown away during the conversion — the result looks exactly like the source.
Can I convert several MP3 files at once?
This converter handles one file at a time. When it's done, click Start over to convert the next MP3 file.
Does it work on iPhone, Android, Mac and Windows?
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on phones, tablets and computers, with nothing to install.

More MP3 conversions

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Add this tool to your website

Copy the code below and paste it into any page. It's free, needs no sign-up, and files are processed in your visitors' own browsers.