What Is .cue

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Last updated: April 10, 2026

Quick Answer: A .cue file is a plain text cue sheet that contains metadata and structural information about audio tracks on CDs and related media, working alongside binary audio files (.bin) to define track boundaries, timing, and playback information. Cue sheets became the industry standard in the 1990s and are essential for CD burning, disc replication, and audio archiving.

Key Facts

Cue sheets became the standard format in the 1990s with CD technology and are still used today for audio archiving and CD replication
Cue files use MM:SS:FF timing format (minutes:seconds:frames, with 75 frames per second on audio CDs) for precise track indexing
A single .cue file can reference multiple audio files and describe up to 99 tracks with metadata including performer names, disc titles, and ISRC copyright codes
Major audio applications including Nero, Alcohol 120%, EAC (Exact Audio Copy), and 50+ other programs support the cue sheet standard
Cue sheets are plain text format, making them human-readable, platform-independent, and compatible across Windows, macOS, and Linux systems

Overview

A .cue file (cue sheet) is a plain text file that contains metadata and structural information about audio tracks on a compact disc (CD) or other digital audio media. These files work in conjunction with binary audio data files (typically .bin files) to describe the layout, track boundaries, and playback information needed for CD burning, replication, and proper audio organization. Cue sheets became the industry standard in the 1990s as CD technology matured, and they remain essential today for archivists, audio professionals, and enthusiasts working with multi-track audio content.

The primary purpose of a cue file is to serve as a bridge between raw audio data and the formatting requirements of CD media. Rather than storing all this information within the audio file itself, cue sheets provide a separate, standardized way to define track starts, indices, gaps, and metadata in a human-readable format. This separation of concerns allows the same audio data to be burned to different disc formats with varying track arrangements, or to be used by multiple different applications without modification to the underlying audio file.

How It Works

Cue sheets operate by using a series of commands and parameters that define the structure of an audio disc. Each line in a cue file typically contains a command followed by parameters that specify timing, track information, or metadata. Here are the key mechanisms:

File References: The cue file begins by identifying the audio file(s) it describes using FILE commands, specifying the filename and format (BINARY, MOTOROLA, AIFF, WAVE, etc.). A single cue sheet can reference multiple audio files if the source material spans different documents.
Track Definitions: Individual tracks are defined using TRACK commands with track numbers (01-99) and mode specifications (AUDIO for music, MODE1/2352 for data). Each track section includes timing information and can contain multiple INDEX points that mark different segments within the track.
Time Indexing: Timing information in cue files uses the MM:SS:FF format, where MM is minutes, SS is seconds, and FF is frames (75 frames per second on audio CDs). The INDEX 00 mark indicates the start of a track's pre-gap, while INDEX 01 marks the actual beginning of the track data that will be heard during playback.
Metadata Storage: Cue sheets can include REM (remark) commands to store additional information such as performer names, disc titles, track names, ISRC codes, and other catalog information. This metadata is preserved during CD burning and replication, ensuring proper identification and copyright tracking.
Gap Specification: The PREGAP and POSTGAP commands define silence or gaps between tracks, typically measured in frames. This is crucial for CD structure compliance and ensures proper track sequencing when the disc is replicated or burned.

Key Comparisons

Aspect	.cue Files	Other Methods
Format Type	Plain text, human-readable	Binary databases or embedded tags
Compatibility	Works across Windows, Mac, Linux; supported by 50+ applications including Nero, Alcohol 120%, and EAC	Proprietary formats may be limited to specific software
Storage Method	Separate from audio file, references external file	Often embedded within audio file or database
Track Organization	Frame-precise timing with MM:SS:FF format (75 frames/second)	Seconds-based timing or approximate track marks
Metadata Capacity	Limited but sufficient (performer, title, ISRC codes)	ID3 tags or similar can store extensive metadata
Industry Use	CD burning, disc replication, audio archiving since 1990s	Streaming and digital distribution typically use embedded metadata

Why It Matters

Disc Replication: Professional CD manufacturing facilities require cue sheets to properly replicate discs with correct track layouts and pregap specifications. Without accurate cue data, mass-produced CDs would have improper track boundaries and timing issues.
Archival Preservation: Audio archivists use cue sheets as part of their preservation strategy for older CD media and multi-track recordings. The format's plain text nature ensures long-term readability regardless of software evolution.
Audio Backup Integrity: When backing up or archiving CDs, cue files preserve the exact track structure and metadata, allowing perfect recreation of the original disc layout. This is especially important for legally-sourced album collections.
Cross-Platform Compatibility: Because cue sheets are plain text with a standardized specification, they work equally well on Windows, macOS, and Linux systems. Audio professionals can transfer projects between different operating systems without data loss.

Understanding .cue files is essential for anyone working with CD-era audio media, whether burning backup discs, creating compilation albums, or preserving audio collections. The format's longevity and universal support across platforms and applications demonstrate its value as a reliable standard for audio organization and disc structure definition. As both physical media preservation and digital audio archiving continue to be important in professional and personal contexts, cue sheets will likely remain relevant for decades to come.