MP3 to FLAC
Convert MP3 audio to FLAC online for free, perfect for unifying your lossless music library or importing into software that only accepts FLAC. Processed entirely in your browser, files are never uploaded to a server, fully protecting your privacy.
Please note: MP3 is a lossy format, and converting to FLAC will not improve audio quality or recover already-lost audio information. This tool is only for format consistency and compatibility. The converted file sounds identical to the original MP3 but will be noticeably larger.
Privacy Protection
All conversions are done locally in the browser; MP3 files are never uploaded to any server, protecting your audio privacy
Unify formats
Convert scattered MP3 files to FLAC for easier lossless music library management or importing into software that only accepts FLAC
High-Speed Conversion
Powered by WebCodecs, conversion is completed quickly using your browser's local computing power, with no upload or download wait
Drag and drop an audio file here
or
MP3 format supported
Convert MP3 to FLAC in three steps
Upload MP3 File
Click the upload area or drag and drop your MP3 audio file, up to 2GB supported
Start Conversion
FLAC is a lossless container, so there's no bitrate to set, just click the button to start converting
Download FLAC
Download your FLAC file once processing is done, all within your browser and with no sign-up required
Typical use cases for MP3 to FLAC
Unify a lossless music library
Some music management software or NAS media libraries use FLAC as their standard format. Converting the few MP3 files mixed in to FLAC keeps the whole library consistent, giving more uniform results when scraping tags and building cover walls.
Import into FLAC-only software
Some DJ software, mastering tools, car systems, or hardware players only accept lossless input such as FLAC. Converting your MP3 files to FLAC lets you import them smoothly, bypassing the format restriction.
Preserve tags for later editing
When doing further audio work like editing or merging, using FLAC as the intermediate format avoids extra loss from repeated lossy compression. Converting MP3 to FLAC first means the editing process no longer adds a second round of MP3 compression loss.
Device compatibility
A small number of high-end audio systems or DACs handle MP3 poorly but natively support FLAC. In such cases, converting MP3 to FLAC lets the device recognize and play it properly, solving the compatibility issue.
Difference between MP3 and FLAC
| Comparison | MP3 (lossy compression) | FLAC (Lossless) |
|---|---|---|
| Audio quality | Lossy compression, some high-frequency information already lost | Lossless container, but no better than the original MP3 when converted from MP3 |
| File Size | Small, about 1-3MB/minute | Large, usually several times bigger when converted from MP3 |
| Tag metadata | Supports ID3 tags | Full support for track, album, cover art, and other tags |
| Use Cases | Everyday listening, online sharing, saving space | Unifying a lossless library, importing into FLAC-only software, compatibility |
When is this tool a good fit
- Your music library uses FLAC as its standard format and you need to convert a few MP3 files along with it
- The target software or device only accepts lossless input such as FLAC
- You need MP3 as a lossless intermediate format in your audio editing workflow
- You explicitly aren't after better audio quality, only format consistency and compatibility
Technical Notes
The VideoKit MP3 to FLAC tool is built on the WebCodecs API. It decodes the MP3 into a PCM audio stream in your browser, then repackages it as a FLAC file using a FLAC lossless encoder. The entire process runs locally, and your audio data is never sent to any server.
Since the audio decoded from an MP3 is already a lossy result, FLAC merely repackages that result losslessly. As a result, the audio quality is no better than the original MP3, while the file size grows significantly. This is determined by the nature of the formats, not a limitation of the tool.
Frequently Asked Questions
Can converting MP3 to FLAC improve audio quality?
No. Information already lost in an MP3 cannot be recovered. Converting to FLAC simply repackages the existing quality losslessly, so it sounds identical to the original MP3.
So why convert MP3 to FLAC at all?
Mainly for format consistency and compatibility: use it when your music library uses FLAC as its standard, or when certain software only accepts FLAC.
Will the FLAC file be larger than the MP3 after conversion?
Yes, usually several times larger. FLAC must losslessly store all the decoded sample data. If you want to save space, keep the MP3.
Which devices can play FLAC files?
Supported by mainstream devices including VLC, foobar2000, Windows/macOS, Android, Hi-Fi lossless players, and car systems.
Will my files be uploaded to a server?
No. All processing happens locally in your browser. Audio files never leave your device — your privacy is fully protected.
What is the maximum input file size?
Audio files up to 2GB are supported. Processing speed depends on your device's performance, but usually takes just a few seconds to a minute.