# Audio Add Chapters Add chapters to an audio file from a label/chapters file > Canonical page: https://elysiatools.com/en/tools/audio-add-chapters - **Category:** Media - **Keywords:** audio, chapters, metadata, labels ## Overview Label/chapters file format: - Each line: start_time(sec) end_time(sec) title(optional) - Separator: TAB or space - Example: 0 10 Intro 10 25 Chapter 1 25 60 Chapter 2 ## Inputs - **Audio File** (file): Select an audio file - **Chapters/Label File** (file): Upload label file (TSV/space separated) ## When to use - When you need to add chapter markers to podcasts, audiobooks, or other audio content for easy navigation. - When you have a label file from audio editing or transcription software and want to embed chapters without manual editing. - When preparing audio for distribution on platforms that support chapter metadata, such as podcast apps or audiobook stores. ## How it works - Upload your audio file in a supported format like MP3 or WAV. - Upload a label file with chapter definitions: each line includes start time (seconds), end time (seconds), and an optional title, separated by tabs or spaces. - The tool processes the files and embeds the chapters into the audio file's metadata. - Download the modified audio file with chapters ready for use in compatible players. ## Use cases - Enhancing podcast episodes with chapter markers to help listeners jump to specific segments like interviews or news. - Creating chapterized audiobooks for distribution on digital platforms, improving user experience with easy navigation. - Adding structure to educational audio content, such as lectures or tutorials, by segmenting them into labeled chapters. ## Frequently asked questions ### What audio file formats are supported? The tool supports common audio formats indicated by the audio/* file type, such as MP3, WAV, and others. ### What is the exact format for the label file? Each line should have start time in seconds, end time in seconds, and an optional title, separated by tabs or spaces. For example: '0 10 Intro'. ### Can I add chapters without providing titles? Yes, titles are optional. Chapters will be added with timestamps only if no title is specified in the label file. ### Are there file size limits? Yes, the audio file can be up to 200 MB, and the label file up to 5 MB, as per the tool's constraints. ### How are chapters stored in the output audio file? Chapters are embedded as metadata, such as ID3 tags for MP3 files, making them accessible in audio players that support chapter navigation. ## Related tools - [Audio Label Split](https://elysiatools.com/en/tools/audio-label-split): Split audio based on an Audacity-style label file - [Audio Script Timing Estimator](https://elysiatools.com/en/tools/audio-script-timing-estimator): Estimate how long a script will take to read aloud, with optional calibration from a recorded sample. - [Audio Read-Along Cue Generator](https://elysiatools.com/en/tools/audio-read-along-cue-generator): Generate sentence or word-level timestamp cues from a narration audio and its script, for karaoke-style reading and language learning. - [Album Art Extractor](https://elysiatools.com/en/tools/audio-album-art-extractor): Extract the album art from an audio file - [Extract Center Channel](https://elysiatools.com/en/tools/audio-center-channel-extract): Extract the center channel from a surround audio file or video audio track - [Audio Extract Segment](https://elysiatools.com/en/tools/audio-extract-segment): Extract a single segment from an audio file - [Extract Left Channel](https://elysiatools.com/en/tools/audio-left-channel-extract): Extract only the left channel to a mono file - [Audio Melody Contour Extractor](https://elysiatools.com/en/tools/audio-melody-contour-extractor): Extract a dominant melody path from audio and export MIDI, note events, a pitch contour, SVG, and JSON in one ZIP. ## Samples - [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio - [Duplicate Line Samples](https://elysiatools.com/en/samples/text-duplicate-line-samples): Sample files with various types of duplicate lines for testing duplicate removal tools - [Regex Replace Samples](https://elysiatools.com/en/samples/regex-replace): Collection of common and useful regex replacement patterns for text transformation and data cleaning - [Windows String Processing - C# Samples](https://elysiatools.com/en/samples/windows-string-processing-csharp): Comprehensive C# string processing examples for Windows platform including string manipulation, splitting, joining, regex operations, and text analysis ## Related content - [Audio Segmentation and Chapter Workflows](https://elysiatools.com/en/hubs/audio-segmentation-workflows): Turn long podcasts, lectures, and recordings into precise clips, silence-based sections, chapters, and ordered delivery segments. - [Audio Metadata, Tags, Chapters, and Album Art](https://elysiatools.com/en/hubs/audio-metadata): Prepare music or podcast files by checking tags, managing artwork, adding chapters, and cleaning delivery metadata.