Bulk Transcribe Audio to PDF Online Free
Convert speech to shareable PDF documents — two Whisper models, up to 216x realtime.
Drop up to 50 files at once — no install, no sign-up required.
Drop Audio or Video Files Here
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How it works
- 1 · Drop your files
Drag & drop audio or video files. Supports MP3, WAV, M4A, MP4, and more. No account required.
- 2 · We transcribe to PDF
Transcribed by OpenAI Whisper (choose Fast or Quality model) with AI-formatted document title. Encrypted in transit & at rest.
- 3 · Download & auto-delete
Get your PDF transcript in seconds. Files delete automatically after 1 hour.
Frequently Asked Questions
Why choose PDF over plain text?
PDF documents are professional, shareable, and archivable.
- Preserve formatting across all devices
- Include AI-generated document titles
- Look polished when sharing meeting notes, interview transcripts, or lecture recordings
- Work offline and can be archived permanently
Can I edit the PDF after downloading?
No — PDF is a fixed-format document.
If you need to make corrections, add comments, or collaborate on edits, use Audio to Word instead.
You can always export Word to PDF once you're done editing.
Is the PDF searchable?
Yes, fully searchable.
The transcript text is embedded as real text (not an image), so you can use Ctrl+F / Cmd+F to search.
The PDF is also indexable by search engines and document management systems.
When should I NOT use PDF?
How does the AI title formatting work?
Our AI analyzes your filename and generates a professional, human-readable document title.
For example, meeting_2024_01_15_final_v2.mp3 becomes Meeting - January 15, 2024.
This title appears at the top of your PDF document.
What is the difference between Fast and Quality models?
Two OpenAI Whisper models — choose speed or accuracy:
| Model | Engine | Speed | Cost |
|---|---|---|---|
| Fast | Whisper V3 Large Turbo (809M) | ~216x realtime | 2 credits/min |
| Quality | Whisper V3 Large (1.55B) | ~189x realtime | 5 credits/min |
Fast is the default — great for clear audio, podcasts, and lectures.
Quality uses the full 1.55B-parameter model. Independent benchmarks show ~10% WER for Quality vs ~12% for Fast (Artificial Analysis). Choose Quality for accented speech, noisy recordings, or technical content.
Both models support 99+ languages. Switch in the options panel above.
Sources: Groq docs, Artificial Analysis benchmark, Hugging Face model cards.
Does Meeting Intelligence work in PDF transcripts?
Yes — Meeting Intelligence appears in PDF transcripts with clear speaker labels, making your document professional and easy to follow.
When Meeting Intelligence is enabled, each paragraph is prefixed with the speaker identifier (e.g., John: or Speaker 1:). This is especially valuable for:
- Meeting records and minutes
- Interview documentation
- Legal or compliance recordings
- Training session archives
Our AI post-processing attempts to extract actual names from the audio when speakers introduce themselves or are addressed by name. Important: This isn't perfect — if names aren't clearly stated, you'll see generic labels like "Speaker 1" and "Speaker 2" instead.
For the best results, ensure participants introduce themselves at the start of the recording: "Hi, I'm Sarah from Engineering..."
What are the limits for this converter?
| Tier | Max File Size | Max Files/Batch | Parallel Processing |
|---|---|---|---|
| Guest/Free | 100 MB | 50 files | 3 at once |
| Pro | 1024 MB | 1000 files | 6 at once |
Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →
How are credits calculated for this conversion?
Cost: 2 credits per minute
How it works:
- Files up to 1 minutes: 2 credits
- 2 minutes: 4 credits
- 3 minutes: 6 credits
- 4 minutes: 8 credits
Example: A 10-minute file = 20 credits. A 180-minute (3h) audiobook = 360 credits.
Why per-minute? Audio conversion time scales with content duration, not file size. Longer audio requires proportionally more processing.
What are my daily and monthly credit limits?
Credit allocations vary by account tier:
| Tier | Daily Limit | Monthly Limit |
|---|---|---|
| Guest | 100 credits/day | — |
| Free | 100 credits/day | — |
| Pro | — | 12,000 credits/month |
Daily credits (Guest & Free tiers) reset every day at midnight UTC. Monthly credits (Pro) reset on your billing cycle date.
Note: With 2 credit per minute, audio files under 1 MB cost 2 credit each. Pro users can convert 6,000 audio files per month.
Answers at a Glance
Quick answers to common questions.
- Are my files secure?
- How long do you keep my files?
- What metadata do you keep?
- What happens after I drop a file?
- Why are conversions so fast?
- How do you measure performance?
- What are the exact limits for each plan?
- Can I process files in bulk?
- Why did my file fail to convert?
- Do you use my files to train AI?
Other Transcription Formats
Need to edit or use your transcript differently?
What's New in Audio to PDF
Latest improvements to this converter
Added Whisper V3 Large as a Quality mode for higher-accuracy transcription.
Launched Audio to PDF transcription with AI-formatted titles.
Need to get more done? Pro starts from $5.
No subscription required.