# Audio Podcast Ad Marker Inserter Insert ad-insertion markers into a podcast episode: audible beep tones, ID3 chapter markers, and metadata tags for programmatic ad insertion. > Canonical page: https://elysiatools.com/en/tools/audio-podcast-ad-marker-inserter - **Category:** Media - **Keywords:** audio, podcast, ad marker, ad insertion, id3 chapter, beep, metadata, dynamic ad, sponsor ## Overview Takes a finished episode and a list of ad-break timestamps, then re-muxes the file with (a) optional short beep tones mixed in at each break point so an editor can see them on the waveform, (b) ID3 CHAP/CTT2 chapter frames marking each ad slot, and (c) standard metadata tags (title/artist/album). Output is an MP3 with embedded chapters that podcast apps and ad-insertion platforms (Megaphone, Acast, Spotify) can read to place dynamic ads. The chapter titles include the ad-break label and duration. ## Inputs - **Audio File** (file): Select a finished podcast episode - **Insertion Points** (textarea): One ad-break timestamp per line: 0:30 Pre-roll 15:00-16:00 Mid-roll 45:00 Post-roll - **Marker Type** (select) - **Default Ad Slot Duration (s)** (number) - **Beep Frequency (Hz)** (number) - **Beep Duration (s)** (number) - **Beep Level (dB)** (number) - **Episode Title** (text): Episode 42: The Big Interview - **Show / Podcast Name** (text): My Awesome Podcast - **Host / Author** (text): Jane Doe ## When to use - When preparing a completed podcast episode for dynamic ad insertion on hosting platforms like Megaphone, Acast, or Spotify. - When you need to embed ID3 CHAP/CTT2 chapter frames to mark ad slots with specific durations and labels. - When you want to mix short, audible beep tones into the audio waveform to help editors visually locate ad-break points. ## How it works - Upload your finished MP3 audio file and input your ad-break timestamps, such as pre-roll, mid-roll, or post-roll, with one entry per line. - Select your preferred marker type, choosing from full markers (beeps, chapters, and metadata), chapters and metadata only, beeps only, or metadata only. - Configure optional settings including default ad slot duration, beep frequency, beep duration, beep volume level, and episode metadata like title, show name, and host. - Process the file to generate a re-muxed MP3 containing the embedded chapters and audio markers ready for distribution. ## Use cases - Preparing a finished MP3 episode for dynamic mid-roll ad placement on Spotify or Megaphone. - Adding visual beep markers to a draft episode so an external editor can easily locate where to insert sponsor reads. - Embedding standard ID3 chapter frames (CHAP/CTT2) and episode metadata (title, show name, host) into a final master file. ## Frequently asked questions ### What platforms support these ad markers? Major podcast hosting and programmatic ad platforms like Megaphone, Acast, Spotify, and standard podcast players that read ID3 chapter tags. ### Can I insert markers without adding audible beeps to my audio? Yes, you can select the 'ID3 chapter + metadata (no beep)' option to insert silent markers. ### What format should the insertion points be in? Enter one timestamp per line, such as '0:30 Pre-roll' or '15:00-16:00 Mid-roll'. ### Does this tool re-encode my entire audio file? No, it re-muxes the file to embed the ID3 metadata and chapters, only mixing in beep tones at the specified timestamps if selected. ### What is the maximum file size supported? The tool supports audio files up to 100 MB. ## Related tools - [Audio Metadata Compress](https://elysiatools.com/en/tools/audio-metadata-compress): Compress or remove metadata and embedded artwork to reduce file size - [Audio Metadata Remover](https://elysiatools.com/en/tools/audio-metadata-remover): Strip technical metadata from an audio file for privacy before sharing - [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. - [Media Metadata to JSON](https://elysiatools.com/en/tools/media-metadata-to-json): Extract audio/video metadata as JSON with ffprobe. - [Audio Add Chapters](https://elysiatools.com/en/tools/audio-add-chapters): Add chapters to an audio file from a label/chapters file - [Audio Ambience Loop Generator](https://elysiatools.com/en/tools/audio-ambience-loop-generator): Extract the background ambience/room tone from a fragment and generate a seamless loop of any target length. - [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. - [Cover Art Embed](https://elysiatools.com/en/tools/cover-art-embed): Embed cover artwork without re-encoding media. ## Samples - [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music - [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 - [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music - [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows ## Related content - [Podcast Recording, Editing, and Delivery](https://elysiatools.com/en/hubs/podcast-recording-editing-delivery): Rescue remote voices, clean speech artifacts, shape the edit, master loudness, add show assets, and validate podcast files before delivery.