Convert MP3 to FLAC
Choose your MP3 file and get a FLAC file in seconds. Nothing leaves your device.
Converter
- FilesOne or many, images and videos mixed
- FolderEvery matching file inside, subfolders included
- ArchiveZIP, RAR, 7z or TAR: convert the contents or the archive itself
Drop files, folders or archives here
Unsupported files are skipped. Nothing is uploaded.
Everything runs in your browser. Files are not uploaded.
About this conversion
Only the audio encoding changes: the recording is decoded and encoded again in your browser.
A FLAC file is usually larger than the MP3 original; choose it for compatibility or editing rather than size.
Good to know
The file usually becomes larger.
Quality does not improve; artifacts of the source stay.
How it works
The audio is converted by ffmpeg compiled to WebAssembly. It loads only when you choose a file and runs in a background thread.
Your browser can
- Built-in image codecs
- Hardware video (WebCodecs)
- Multiple threads
- Create AVIF natively
If something is missing, the conversion takes a little longer but still works.
About MP3 (MPEG-1 Audio Layer III)
MP3 is the classic compressed audio format that plays on practically every device made in the last 25 years.
- Music collections
- Podcasts and audiobooks
- Sharing recordings with anyone
About FLAC (Free Lossless Audio Codec)
FLAC compresses audio without any loss, typically to about half the size of a WAV file.
- Bit-perfect copy of the original
- Roughly 40 to 60 percent smaller than WAV
- Open, royalty free and well tagged
Related conversions
Frequently asked questions
Are my files uploaded to a server?
No. The conversion runs entirely in your browser with local code. Your files never leave your device, and there is no upload.
Is there a file size limit?
There is no limit on our side, but your browser memory is. Images work for very large files; for videos, files above a few hundred megabytes can fail on devices with little memory.
Will the quality suffer?
That depends on the target format and settings. Use the quality option to balance size and detail; lossless targets keep everything the source contained.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari. Fast hardware paths are used where available, with a compatible fallback otherwise.