Free online BIN to MP3 converter

A phone, car stereo, or editing program may require individual MP3 tracks instead of a CD-image file. Converting the image also reduces storage size and makes the music easier to share and tag.

What the BIN format is

.bin is a generic binary-data extension, not one defined audio codec. In the Audio category, it commonly identifies a CD image containing raw disc sectors created by disc-ripping or imaging software. Other BIN files contain no audio and cannot be converted to MP3.

An audio CD image normally includes a matching .cue sheet, such as album.bin and album.cue. The CUE file identifies the BIN filename and records track boundaries, pregaps, track types, and sometimes metadata. Open it in a text editor and look for entries such as TRACK 01 AUDIO. A BIN without its CUE file may still contain audio, but separate track boundaries and metadata may be unavailable.

Do not rename .bin to .mp3. Renaming changes only the filename extension; it does not decode or compress the audio.

What the MP3 format is

MP3 is a lossy, compressed audio format supported by phones, car stereos, browsers, portable players, and media libraries. It creates much smaller files than uncompressed CD audio by discarding audio information that may be less perceptible.

MP3 is appropriate when compatibility and file size matter more than lossless preservation. Keep the original BIN/CUE image or extract lossless WAV or FLAC files for archival use, because MP3 encoding cannot be reversed and repeated encoding reduces quality.

How to convert a BIN/CUE image

Use the CUE sheet rather than opening the BIN alone. It supplies the layout required to separate audio tracks from any data tracks.

1. Place album.bin and album.cue in the same folder. If the BIN was renamed, edit the CUE file's FILE line so it names the actual BIN file.
2. Install bchunk, a BIN/CUE extraction utility, and FFmpeg. On macOS with Homebrew, use brew install bchunk ffmpeg; on Debian or Ubuntu, use sudo apt install bchunk ffmpeg.
3. Extract audio tracks as WAV files with bchunk -w album.bin album.cue track. This normally creates track01.wav, track02.wav, and additional files for audio tracks. Data tracks may be output separately and are not MP3 sources.
4. Encode each WAV file with LAME through FFmpeg: ffmpeg -i track01.wav -c:a libmp3lame -q:a 2 track01.mp3. Repeat for the other tracks, or use a shell script to process the whole set.
5. Check the MP3 files in a player and add artist, album, title, track number, and artwork with a tag editor such as Mp3tag, MusicBrainz Picard, or foobar2000. CUE metadata is not guaranteed to transfer during extraction.

On Windows, foobar2000 can provide a graphical alternative when its decoders and the LAME encoder are installed. Open the CUE file, select the displayed tracks, choose Convert → …, select MP3 (LAME), choose the quality setting, and start the conversion. If foobar2000 cannot open the image, check the CUE filename reference and use bchunk for extraction.

You can also convert a recognized audio BIN on 101convert.com for free without installing software. A BIN/CUE disc image may require local track extraction first, because an online converter may not interpret the CUE layout or may treat the BIN as unsupported binary data.

How to convert a raw PCM BIN

Some audio hardware and legacy programs store uncompressed PCM samples in a BIN file without a header. The source documentation must provide the sample rate, bit depth, channel count, signedness, and byte order; FFmpeg cannot infer these values from raw bytes.

For signed 16-bit little-endian stereo PCM at 44,100 Hz, use:

ffmpeg -f s16le -ar 44100 -ac 2 -i audio.bin -c:a libmp3lame -q:a 2 audio.mp3

Change -f, -ar, and -ac to match the source. Incorrect settings cause noise, wrong speed or pitch, distortion, or channel errors. Audacity can import the file through File → Import → Raw Data; enter the documented parameters, verify the waveform and playback, then use File → Export Audio and select MP3.

Quality and compatibility limits

For CD audio, retain 44.1 kHz during conversion. LAME VBR quality -q:a 2 provides high-quality general listening with smaller files; -q:a 0 produces larger files, while a fixed rate such as -b:a 192k or -b:a 256k may suit devices that require constant bitrate.

A BIN/CUE image can preserve disc layout, pregaps, hidden tracks, and other details that are not represented completely in ordinary MP3 files. If the CUE sheet contains FLAGS PRE, the source uses CD pre-emphasis and should be de-emphasized before MP3 encoding to avoid excessively bright sound.

If extraction produces only an ISO or other data-track output and no audio tracks, the image does not contain standard CD audio. A proprietary or encrypted audio BIN must first be opened with the software that created it; applying raw-PCM settings to it produces noise rather than recoverable music.