Bulk Transcribe Audio to SRT Subtitles Online Free
Generate SRT subtitles with accurate timestamps — 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 generate subtitles
Transcribed by OpenAI Whisper (choose Fast or Quality model) with accurate timestamps. Encrypted in transit & at rest.
- 3 · Download & auto-delete
Get your SRT subtitle file in seconds. Files delete automatically after 1 hour.
Frequently Asked Questions
What is the SRT format?
SRT (SubRip Text) is the most widely supported subtitle format.
It contains numbered subtitle entries with timestamps and text.
SRT files work with virtually all video players, editors, and platforms including YouTube, Vimeo, and social media.
SRT vs VTT — which should I use?
Use SRT for:
- Video editing software
- Desktop players (VLC, QuickTime)
- Platforms like YouTube, Vimeo, or Facebook
Use VTT for HTML5 web video with <track> tags.
SRT has broader legacy compatibility across devices and software; VTT supports advanced styling and positioning for web.
Need web captions instead? Try Audio to VTT →
How accurate are the timestamps?
Our AI generates word-level timestamps using OpenAI Whisper — one of the most accurate speech recognition models available.
Timestamps are typically accurate to within a few hundred milliseconds.
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.
Can Meeting Intelligence label who speaks in subtitles?
Yes — Meeting Intelligence adds speaker labels to your SRT subtitles. This makes it clear who's speaking in multi-speaker videos like interviews, panel discussions, or podcasts.
When enabled, speaker names or labels appear at the start of subtitle entries:
1
00:00:01,000 --> 00:00:04,000
John: Welcome to the show.
2
00:00:04,500 --> 00:00:07,000
Sarah: Thanks for having me.Our AI post-processing attempts to identify speakers by name when they're introduced or addressed in the audio. Important: Name detection isn't perfect — it works best when speakers introduce themselves ("Hi, I'm John...") or are called by name. If names aren't detected, you'll see generic labels like "Speaker 1" and "Speaker 2."
Meeting Intelligence costs extra credits and is ideal for content where knowing who speaks matters.
Can I customize the subtitle timing?
The generated SRT file uses Whisper's word-level timing, which works well for most use cases.
For fine-tuning, import the SRT into any subtitle editor (Aegisub, Subtitle Edit) to adjust timing, merge lines, or split captions.
The transcript text will be accurate — you're just adjusting presentation.
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 a different output format for your transcription?
What's New in Audio to SRT
Latest improvements to this converter
Added Whisper V3 Large as a Quality mode for higher-accuracy transcription.
Launched Audio to SRT transcription with timestamped subtitles.
Need to get more done? Pro starts from $5.
No subscription required.