In this guide
Choose a compatible FLAC file, make an MP3 at a bitrate suited to your use, and listen to the exported file. MP3 is a new lossy encode, so keep the original FLAC and check timing, tags and artwork if they matter.
To convert FLAC to MP3, open the FLAC in a compatible converter or audio editor, choose MP3 and an appropriate bitrate, then export and listen to the result. Keep the original FLAC: MP3 is a lossy format, and converting the MP3 back to FLAC will not restore information discarded by the MP3 encoder.
For a compatible short mono or stereo file, the Saturalabs FLAC-to-MP3 converter works locally in the browser. Audacity and FFmpeg provide desktop alternatives for longer files or different workflows.
Choose a conversion method
| Method | Useful for | Check first |
|---|---|---|
| Browser converter | A short compatible local FLAC with a simple MP3 export. | Input up to five minutes and 50 MiB, mono or stereo decoded audio, output up to 50 MiB; browser codec support varies. |
| Audacity | A desktop workflow where you may also want to edit or inspect audio. | Choose the intended export range, channel settings and bitrate. |
| FFmpeg | A command-line workflow or conversion in a script. | Requires an installed FFmpeg build with an MP3 encoder and a compatible output path. |
Method 1: convert FLAC to MP3 in your browser
- Open FLAC to MP3 and choose a compatible local FLAC no longer than five minutes and no larger than 50 MiB. The browser must decode it as mono or stereo.
- Select MP3 and choose 128, 192 or 320 kbps. Higher bitrates generally create larger files, but codec, material and listening conditions also affect the result.
- Convert the file, preview the actual MP3, and download it before leaving the page. The output must also fit 50 MiB. Audio processing is local; no account or audio upload is needed for this converter.
- Listen to a quiet section, a busy section and the ending. Compare with the original at a similar volume, and check timing if the file will be used with video.
The browser converter decodes and resamples the source to 48 kHz before encoding MP3. It does not copy original tags or artwork. It also offers a 16-bit PCM WAV output, but resampling or reducing a higher bit depth can change samples; that option is not a guaranteed sample-preserving FLAC-to-WAV conversion.
Method 2: convert using Audacity
- Open Audacity and import the FLAC file. Audacity's file-format guidance lists FLAC among supported audio formats.
- Play the beginning and end to verify the correct file and channels. If you only need conversion, avoid changing the audio unnecessarily.
- Choose File → Export Audio, select MP3, and set the desired bitrate and export range. Audacity's export guide distinguishes a playable audio export from an editable project.
- Save under a new filename and play the finished MP3. Check its duration, sound, channels and any metadata needed by your player.
Method 3: convert with FFmpeg
If you already use FFmpeg, run a command locally in a terminal. Replace the example names with your own paths and choose a new output file. This example requests the libmp3lame encoder at 192 kbps; your FFmpeg build must include that encoder.
ffmpeg -n -i "input.flac" -c:a libmp3lame -b:a 192k "output.mp3"The -n option avoids overwriting an existing output. FFmpeg's official documentation describes its input, output and codec options. Check the resulting file and any metadata instead of assuming that every tag or artwork item transfers correctly.
How much smaller will the MP3 be?
For a constant-bitrate estimate, multiply duration in seconds by bitrate in kilobits per second and 1,000, then divide by eight for bytes. At 192 kbps, a four-minute audio payload is approximately 5.76 MB, using decimal MB. Headers, tags and padding can change the final size. FLAC size depends on the source and compression, so there is no universal percentage reduction.
The audio file size calculator can estimate another duration or rate. For an actual delivery limit, inspect the completed file rather than relying on the estimate. The MP3 bitrate guide explains how to compare options by listening.
FLAC vs MP3: what changes?
FLAC losslessly compresses the samples it encodes, as described by the FLAC project. MP3 uses lossy encoding, which can discard information. A FLAC made from an already lossy source does not restore missing detail; similarly, converting the new MP3 back to FLAC creates a lossless encoding of that MP3's decoded audio, not the original FLAC.
Keep the FLAC when possible for archiving or later conversions. For an editing workflow, the FLAC versus WAV guide explains lossless handling and sample-format choices.
Common questions
Can I convert FLAC to MP3 without uploading it?
Yes. A compatible short file can be converted locally with the browser tool above, and desktop applications can process local files. Browser support and tool limits vary.
Is 320 kbps MP3 lossless?
No. MP3 is lossy at 320 kbps too. Compare the actual export with the original and keep the FLAC.
Why won't my FLAC convert in the browser?
Check file duration and size, output size, channel count and whether the browser can decode the file. Try a desktop converter for unsupported, longer or multichannel material.
Will the MP3 preserve album art and tags?
It depends on the converter. The Saturalabs browser tool does not copy them; inspect and add metadata separately when needed.