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Audio Add Chapters

· Last updated：2025-11-28

Add chapters to an audio file from a label/chapters file

Details

What this tool helps you do

Label/chapters file format:

  • Each line: starttime(sec) endtime(sec) title(optional)
  • Separator: TAB or space
  • Example:
    0 10 Intro
    10 25 Chapter 1
    25 60 Chapter 2

Execution

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Written by the Elysia Tools team
Audio312
Metadata66

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
file
Output type
file
Sample coverage
4
API ready
Yes

Overview

This tool adds chapters to an audio file using a label or chapters file. Upload your audio and a text file with timestamps and titles to embed navigable chapter markers directly into the audio metadata.

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

  1. 1Upload your audio file in a supported format like MP3 or WAV.
  2. 2Upload a label file with chapter definitions: each line includes start time (seconds), end time (seconds), and an optional title, separated by tabs or spaces.
  3. 3The tool processes the files and embeds the chapters into the audio file's metadata.
  4. 4Download 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.

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Who it's for

Best for

  • Convert CSV files in the browser.
  • Repeatable jobs with CSV files and the same settings every time.
  • Jobs where the output is a downloadable file.

Not ideal for

  • Fully automated batch jobs — this page is built for interactive use; use the API endpoint for scripts.
  • Files in formats this tool does not accept — it works with .txt, .csv input.

Edge cases & common failures

  • Byte-order mark (BOM)

    A UTF-8 BOM at the start of the file can appear as odd characters in the first header name.

  • Very large files

    Large files take longer and can hit browser memory limits — try a smaller sample first.

  • Skipping the output check

    Compare the first rows or pages of the output with the input before using it in production.

Examples

1. Add Chapters to a Podcast Episode

Podcast Producer

Background

You produce a weekly podcast and want to add chapters to make long episodes more navigable for listeners.

Problem

Listeners often skip through episodes to find specific parts, leading to a poor experience.

How to use

Upload the podcast audio file and a text file with chapter timestamps and titles, such as '0 120 Introduction' and '120 300 Interview'.

Outcome

The podcast episode now has embedded chapters, allowing listeners to easily jump to sections in their audio player.

2. Segment an Audiobook into Chapters

Audiobook Narrator

Background

You've recorded an audiobook and need to divide it into chapters based on the book's structure for publishing.

Problem

Manually inserting chapters in audio editing software is time-consuming and error-prone.

How to use

Provide the complete audiobook audio file and a label file listing chapter start and end times with titles, like '0 300 Chapter 1: The Beginning'.

Outcome

A chapterized audiobook is generated, ready for upload to platforms like Audible or Apple Books with proper navigation.

FAQ

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.

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