Free online MP3 to FLAC converter

Convert MP3 audio to FLAC for compatible playback, editing, or lossless storage.

Convert MP3 to FLAC online - free

.mp3 .flac

Drop up to 3 .MP3 files here or click to browse

Max 30 MB per file · No registration required · max 90 MB total

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Sample rate

auto 22050 Hz 44100 Hz 48000 Hz

Channels

auto Mono Stereo

Your file is processed instantly and deleted as soon as you download it.

How it works

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Upload your .mp3 file

Click to browse to select your file you want to convert or simply drag & drop your file into selected area.
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Perform .mp3 to .flac conversion

After successful file upload, click to convert when you are ready.
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Download converted .flac file

Conversion result is ready to download.

Conversion statistics: MP3 to FLAC

MP3 files are most often converted to AT3 23% NBS 20% MUSICXML 9% SF2 7%

Updated November 10, 2026, from conversions on 101convert.com

How to convert mp3 to flac file

November 10, 2026
Audio
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A music player or editing application that accepts FLAC but not MP3 may require this conversion to import an existing track. Converting the file cannot recover audio removed when the MP3 was encoded.

What the MP3 format is

MP3 (.mp3) is a lossy compressed audio format commonly used for downloaded music, portable playback, and audio libraries. Its compression reduces file size by discarding audio information, so decoding an MP3 does not reproduce the original recording exactly.

What the FLAC format is

FLAC (.flac) is a lossless compressed audio format: it preserves the decoded audio samples without further loss. It is useful for editing or storing audio in a lossless format, but FLAC files are generally larger than MP3 files, and not every device or application supports FLAC.

How to convert MP3 to FLAC

On 101convert.com, select the MP3 file and FLAC as the output format, then start the conversion and download the result. Several files can be converted in one batch. Before converting, you can set the sample rate and channels; the per-file size limit is shown on the page. The conversion runs on the site’s server with FFmpeg.

For desktop conversion with Audacity, open the MP3, choose File → Export Audio, select FLAC as the file type, then export. If you change the sample rate or channel count during conversion, the audio is resampled or remixed.

Quality and compatibility

FLAC encoding is lossless relative to the audio decoded from the MP3, not the original recording. The resulting file usually takes more space without improving sound quality. For a lossless copy of the original, convert from a lossless source instead of an MP3.

MP3 vs FLAC: format comparison

How the MP3 and FLAC formats compare on the properties that matter most for this conversion.

Comparison of the MP3 and FLAC file formats
Property	.MP3 MPEG-1 Audio Layer III	.FLAC Free Lossless Audio Codec
Compression	Lossy	Lossless
Audio quality	High	Lossless
Audio channels	Up to stereo	Up to stereo
Metadata support	Extensive	Extensive
Streaming	Partial	Partial
DRM protection	Optional	No DRM
Opens in a web browser	Yes, natively	Partial
Typical file size	Small	Medium
Open standard	Partly open	Yes
Best used for	Music	Music
Introduced	1993	2001
Developer	Moving Picture Experts Group (MPEG)	Xiph.Org Foundation
MIME type	audio/mpeg	audio/flac

Open MP3 file Open FLAC file

Information about file extensions and file types is provided by File-Extensions.org

Frequently asked questions

Is the MP3 to FLAC converter free?

Yes, converting MP3 to FLAC on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.

How large can my MP3 file be?

You can upload MP3 files up to 30 MB and convert up to 3 files at once in a single batch. With a paid plan the limit is up to 1000 MB per file and 100 files at once, see our plans.

What happens to my uploaded files?

Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.

Do I need to install any software to convert MP3 to FLAC?

No. The MP3 to FLAC conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.

Did the conversion fail?

In most cases, the cause is an incorrect file format. Please upload a valid MP3 file for this MP3 to FLAC conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.

mp3 to fla mp3 to flv

Additional formats for
mp3 file conversion

Reverse conversion

flac to mp3

Convert to flac from
other formats

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Free online MP3 to FLAC converter