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FLAC to MP3 Converter (Free, Online, No Upload)
Convert any FLAC file to MP3 right in your browser. Nothing gets uploaded to a server. MP3 plays on every device and app imaginable, so this is useful when you need a smaller, universally compatible version of your lossless audio. The conversion runs locally using FFmpeg compiled for your browser.
Try it in your browser
Loading FFmpeg engine... (~31 MB)
Use the API
curl -X POST https://renderio.dev/api/v1/run-ffmpeg-command \
-H "X-API-KEY: ffsk_your_api_key" \
-H "Content-Type: application/json" \
-d '{
"ffmpeg_command": "-i {in_audio} -c:a libmp3lame -q:a 0 {out_audio}",
"input_files": {
"in_audio": "https://example.com/input.flac"
},
"output_files": {
"out_audio": "output.mp3"
}
}'Need an API key? Get your free API key to start processing files programmatically.
Common Variations
320kbps constant bitrate
-i input.flac -c:a libmp3lame -b:a 320k output.mp3V0 variable bitrate (best quality)
-i input.flac -c:a libmp3lame -q:a 0 output.mp3192kbps for balanced size/quality
-i input.flac -c:a libmp3lame -b:a 192k output.mp3Related Operations
Need to process at scale?
Automate this with the RenderIO FFmpeg API. Process thousands of files programmatically or through no-code video automation.