Convert MP3 to FLAC
Free, fast MP3 → FLAC. No watermarks, no sign-up.
How to convert MP3 to FLAC
1. Upload MP3
Drop your MP3 file into the converter above.
2. Confirm FLAC
Output is already set to FLAC. Adjust only if you need to.
3. Download
Convert and download your FLAC file instantly.
Format Details
MP3
MP3 (MPEG Audio Layer 3) is the world's most popular digital audio format, developed by the Moving Picture Experts Group in the early 1990s. It uses psychoacoustic lossy compression to dramatically reduce file sizes while retaining audio quality that is perceptually adequate for most listeners. MP3 transformed the music industry by making digital music portable enough to share over the internet and store on devices with limited storage.
audioFLAC
FLAC (Free Lossless Audio Codec) is an open-source audio format that compresses audio without any loss of quality, allowing perfect bit-for-bit reconstruction of the original recording. It typically reduces file sizes by 40-60% compared to uncompressed WAV while remaining completely lossless. FLAC is the format of choice for audiophiles, music archivists, and mastering engineers who require studio-quality audio fidelity in a manageable file size.
audioConverting MP3 to FLAC: what actually changes
MP3 to FLAC is one of the conversions this site performs, but the two formats are not interchangeable containers. Here is what the file keeps, what it loses, and how to get a result you can use.
What .MP3 and .FLAC each hold
.MP3 is a audio format built for listening to or editing a recording, storing sample rate, channels and bitrate. .FLAC is a audio format built for listening to or editing a recording, storing sample rate, channels and bitrate. Converting between them is a decision about which of those two jobs the result needs to do.
What changes in the conversion
Both files belong to the audio category, so this is a like-for-like repackage: the same kind of content, stored in a different container. What changes is how .FLAC encodes sample rate, channels and bitrate — not what the file is about.
Quality and file size
.MP3 has already discarded detail during compression, and converting to .FLAC cannot bring it back. The output will be lossless from here on, so the file gets larger without recovering what the original threw away.
When this conversion is the right one
Reach for .FLAC when the software, device or platform you are sending to expects it — the content is the same audio, only the packaging differs. The reverse direction works the same way, so you can always convert back from .FLAC to .MP3 using the same tool.
Tips for a clean MP3 to FLAC conversion
Start from the original file
Convert the .MP3 you started with, not an earlier .FLAC output. Every extra round trip costs quality and can accumulate formatting drift.
Check the real type, not the extension
Audio/mpeg becomes audio/flac. If a file was renamed rather than converted, it will fail to open — rename it back to its true extension before uploading and the conversion will recognise it.
Length decides the time
Conversion runs in real terms on duration: a few seconds of media finishes almost at once, while a full-length .MP3 takes noticeably longer. Upload once and let it finish rather than retrying.
Limits worth knowing
Uploads are capped per file (30 MB, or 100 MB for video) and processed temporarily — nothing is kept as a permanent copy. For huge audio files, split or compress the source first.
Frequently Asked Questions
How do I convert MP3 to FLAC?
Upload your MP3 file on Convertek, select FLAC as the output format, then click Convert. Your FLAC file will be ready to download instantly.
Is the MP3 to FLAC converter free?
Yes. Converting MP3 to FLAC on Convertek is completely free with no watermarks. Fair upload limits apply (typically 30 MB per file).
Is my file kept after conversion?
No. Files are processed temporarily and not stored permanently. Converted downloads are available only in your browser session.
What is the difference between MP3 and FLAC?
MP3 and FLAC are different file formats with distinct use cases. Converting between them lets you use your file in software or workflows that require the FLAC format.