Audio to SRT Converter
Transcribes YOUR actual audio → generates real SRT, LRC & ASS subtitles
Get your FREE key at assemblyai.com → Sign Up → Dashboard → Copy API Key
✅ Free tier: 100 hours/month · No credit card required
No problem — extract the audio from your video right here in the browser, then send it straight into this converter to generate SRT, LRC & ASS subtitles. No downloading, no re-uploading needed.
Free Audio to SRT, LRC & ASS Subtitle Converter
Upload any audio file and get an accurate, real transcription converted into SRT, LRC, and ASS subtitle formats — directly in your browser.
What Is This Tool?
Audio to SRT Converter is a free browser-based tool that transcribes the actual spoken content of your audio file using AssemblyAI's real speech-to-text engine, then automatically generates properly timed subtitle files in SRT, LRC, or ASS format — ready to download and use with YouTube, VLC, music players, or video editors.
How to Convert Audio to Subtitles in 4 Steps
Get a Free API Key
Sign up at AssemblyAI — no credit card required.
Upload Your Audio
Drag & drop or browse — MP3, WAV, M4A, and more.
Select Language
Auto-detect or choose from 45+ languages manually.
Download Subtitles
Get your transcript as SRT, LRC, or ASS instantly.
Why Use This Audio to SRT Converter
Real AI Transcription
Uses AssemblyAI's Universal-2 speech model for accurate results, not a fake demo.
45+ Languages
Includes Urdu, Hindi, Punjabi, Arabic, English, and many more with auto-detect.
3 Subtitle Formats
Export as SRT for video, LRC for music, or ASS for advanced styling.
Your Own API Key
Free 100 hours/month directly from AssemblyAI, no middleman limits.
Privacy-Friendly
Your API key stays only in your browser storage — never sent to our server.
Fast Processing
Most audio files are transcribed within 30–60 seconds.
Which Subtitle Format Should You Choose?
| Format | Best For | Common Use |
|---|---|---|
| SRT | Videos and general subtitles | YouTube, VLC, most video editors |
| LRC | Music and lyrics | Karaoke apps, music players |
| ASS | Styled subtitles | Advanced video editing with custom fonts/effects |
Who Is This For?
- YouTubers who need accurate captions for their videos
- Podcasters converting episodes into readable transcripts
- Content creators adding multilingual subtitles
- Students and researchers transcribing interviews or lectures
Understanding Subtitles and Transcription Accuracy
What Is an SRT File?
SRT (SubRip Subtitle) is the most widely used subtitle format. It contains numbered blocks of text, each with a start and end timestamp, which video players use to display captions in sync with the audio or video.
How Accurate Is the Transcription?
This tool uses AssemblyAI's Universal-2 speech recognition model, which delivers high accuracy for clear audio. Accuracy can vary with background noise, multiple speakers, or heavy accents — reviewing the transcript before downloading is recommended.
Frequently Asked Questions
Is this Audio to SRT Converter free?
Yes, the tool itself is completely free. You only need a free AssemblyAI API key, which includes 100 hours of transcription per month at no cost.
Do I need an API key to use this tool?
Yes. AssemblyAI provides real speech-to-text transcription, so you need your own free API key from assemblyai.com to process audio.
What audio formats are supported?
MP3, WAV, M4A, AAC, OGG, FLAC, and WEBM files up to 20 MB are supported.
Which subtitle formats can I download?
You can download your transcript as an SRT, LRC, or ASS file, depending on your needs.
Does this tool support Urdu and Hindi?
Yes. Along with Urdu and Hindi, the tool supports Punjabi, Bengali, Arabic, and over 40 other languages, with automatic language detection available.
Is my audio file uploaded to your server?
No. Your audio is uploaded directly and securely to AssemblyAI for processing; it does not pass through or get stored on our server.
Is my API key safe?
Yes. Your API key is stored only in your own browser's local storage and is never transmitted to any server other than AssemblyAI.
Why does transcription sometimes take longer?
Processing time depends on audio length and current AssemblyAI server load. Most files complete within 30 to 60 seconds.
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