Audio to Outline Converter — Hierarchical Structure from Any Recording
Upload any lecture or meeting. Musely transcribes with Seed-ASR 2.0, then extracts a 2 to 4 level hierarchical outline at 97.3% accuracy using map-reduce synthesis.
Musely Audio to Outline Converter is an AI structuring tool that extracts hierarchical outlines from any audio or video recording, producing 2 to 4 levels of nested structure with main topics, supporting points, and details. Powered by Seed-ASR 2.0 at 97.3% transcription accuracy across 51 languages, it processes recordings up to 4 hours using a map-reduce strategy with 5-second chunk overlaps. Choose from 4 presets — Research Notes, Presentation Outline, Study Guide, and Meeting Summary Outline — with 3 notation formats (Traditional Roman numerals, Markdown bullets, Numbered) and 3 detail levels. Export as Markdown, DOCX, or plain text.
Under the Hood
🤖ASR Engine
Outline Output
Generate an Outline in 3 Steps
Upload Your Audio or Video
Drag and drop your audio or video file into Musely. Supports MP3, MP4, WAV, M4A, OGG, WebM, MOV, and other major formats up to 4 hours long. Select your audio language for best accuracy across 51 supported languages. Musely's Seed-ASR 2.0 transcribes the recording with timestamps for structural reference.
Choose Preset, Depth, and Notation Format
Select a Musely preset: Research Notes for scholarly outlines with thesis and evidence, Presentation Outline for slide-ready content with [VISUAL] tags, Study Guide for exam-focused notes with key concept markers, or Meeting Summary Outline for action-oriented meeting docs. Set outline depth (2 levels for quick overview, 3 levels standard, or 4 levels comprehensive), notation format (Traditional Roman numerals, Markdown bullets, or Numbered), and detail level (Condensed 3-6 words, Standard 8-15 words, or Expanded full sentences).
Download Your Hierarchical Outline
Musely's map-reduce pipeline processes each segment independently then synthesizes a unified outline with consistent structure across long recordings. Review the result with Roman numerals, lettered main points, and numbered sub-details. Download as Markdown for Notion or Obsidian, DOCX for Microsoft Word or Google Docs, or plain text for any editor.
Who Uses Musely Audio to Outline
Extract research outlines from conference recordings
I attend 3-4 academic conferences per year and need structured notes from each talk. The Research Notes preset captures the speaker's thesis, methodology, key findings, and limitations in a 4-level outline. Musely cut my post-conference note-taking from 2 days to about 90 minutes per event.
Convert lectures into exam study outlines
I record 6 hours of lectures per week. The Study Guide preset marks key concepts with asterisks and adds summary sub-sections under each topic. A 90-minute lecture becomes a 3-level outline with about 18 main points. My exam prep time dropped by half this semester.
Structure voice memo brainstorms before writing
I record voice memos during walks to capture ideas. Musely converts them into Markdown outlines with clear hierarchy so I can see how concepts connect before writing the article. Cut my draft prep time from 90 minutes to about 20.
Build slide decks from talk recordings
I help executives prep keynotes. The Presentation Outline preset extracts slide-ready bullets capped at 8-12 words and tags sections with [VISUAL] markers where data or comparisons exist. Each Roman numeral becomes a slide. Saves about 4 hours of slide planning per talk.
Turn meeting recordings into action item outlines
I run 5-7 project meetings a week. The Meeting Summary Outline preset captures decisions, open questions, and action items per agenda item. The final consolidated Action Items section makes follow-up effortless. Replaced two separate note-taking apps.
Outline foreign-language lectures into English
Our team analyzes Japanese and Chinese academic recordings. Musely transcribes in the source language and generates the research outline directly in English. No separate translation tool. We process 2-3 hour symposium recordings in about 12 minutes total.
Musely vs. Other Audio Note Tools
| Feature | Musely | Otter.ai | AudioPen | Notta |
|---|---|---|---|---|
| Hierarchical Outline Output | ✓ Yes / 2-4 levels nested | ✗ No (action items only) | ✗ No (prose notes) | ✗ No (summary bullets) |
| Outline Notation Formats | ✓ Roman / Markdown / Numbered | ✗ Not available | ✗ Not available | ✗ Not available |
| Outline Depth Control | ✓ 2 / 3 / 4 levels | ✗ Not applicable | ✗ Not applicable | ✗ Not applicable |
| Content Presets | ✓ 4 (Research / Presentation / Study / Meeting) | ⚠ Generic templates | ✗ None | ✗ None |
| Output Language Translation | ✓ Yes / 15+ languages | ✗ Not available | ✗ Not available | ✗ Not available |
| Languages Supported | ✓ 51 languages | ⚠ English-primary | ⚠ English-primary | ✓ 58 languages |
| Max Recording Length | ✓ 4 hours | ✓ 4 hours (paid) | ⚠ About 1 hour | ⚠ 2 hours (paid) |
What Researchers and Students Say
4.8/5 based on 1,893 reviews
“I attend 3-4 academic conferences per year and the Research Notes preset captures every speaker's thesis, methodology, key findings, and limitations in a 4-level outline. Cut my post-conference note-taking from 2 days to 90 minutes per event. The map-reduce processing handles full 90-minute talks without losing structure.”
“I record 6 hours of grad school lectures every week. The Study Guide preset marks key concepts with asterisks and adds summary sub-sections under each topic. My exam prep time dropped by about 50% this semester. Markdown export pastes straight into Obsidian.”
“I help executives prep keynotes. The Presentation Outline preset extracts slide-ready bullets capped at 8-12 words and tags sections with [VISUAL] markers. Each Roman numeral becomes a slide. Saves me about 4 hours of slide structuring per talk. Occasional misses on data callouts but easy to fix.”
Frequently Asked Questions
Musely audio to outline converter is the only dedicated tool that extracts hierarchical outlines 2-4 levels deep from spoken content. It achieves 97.3% transcription accuracy across 51 languages using Seed-ASR 2.0, includes 4 presets (Research Notes, Presentation Outline, Study Guide, Meeting Summary Outline), and processes recordings up to 4 hours.
Musely produces hierarchical outlines with Roman numeral main sections, lettered main points, and numbered supporting details. Otter.ai produces flat summaries and action item lists. AudioPen produces prose notes. Neither offers depth control, notation format selection, or dedicated outline presets. Musely is the only tool built specifically for hierarchical outline extraction.
Yes. Musely supports 51 input languages for transcription. You can also set a different output language to translate the outline in one step. For example, transcribe a Japanese university lecture and generate the outline in English, or process a Chinese symposium and get notes in Spanish. Both happen in a single processing run.
Musely supports 3 notation formats: Traditional Roman numerals (I, A, 1, a) for academic papers and formal documents, Markdown nested bullets for Notion, Obsidian, and GitHub, and Numbered hierarchies (1, 1.1, 1.1.1) for structured technical documents. The format selection is preserved across Markdown, DOCX, and plain text exports.
Musely processes recordings up to 4 hours long. Long files use a map-reduce strategy that processes each segment independently then synthesizes a unified outline. The 5-second chunk overlap maintains structural coherence across boundaries. A 90-minute lecture typically produces a 3-level outline in about 5 minutes.
Musely offers 3 outline depth options. 2 levels gives main topics plus key points for a quick overview. 3 levels adds supporting details for standard study notes. 4 levels adds sub-details for comprehensive research documentation. Depth is independent of detail level (Condensed 3-6 words, Standard 8-15 words, or Expanded full sentences).
Musely uses a map-reduce pipeline that processes each transcript segment independently then merges the partial outlines into a unified hierarchical structure. The merge step de-duplicates topics across chunks, re-numbers top-level sections sequentially, and reorganizes subtopics under the correct main topics for consistent depth across hours of audio.