Free Audio to SRT Converter - AI-Powered Subtitle Generator
This free audio to SRT converter uses real AI speech recognition to transcribe your audio and turn it into accurate, properly-timed subtitle files. Upload an MP3, WAV, or any common audio format, and within a minute you get a ready-to-use SRT file for YouTube or VLC, an LRC file for karaoke and music apps, or an ASS file for advanced video editing. It works with Urdu, Hindi, English, and over 45 other languages, with automatic language detection built in. Got a video instead of audio? A built-in extractor pulls the audio out for you right on this page, so you never need a separate converter.
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.
How to Convert Audio to SRT Subtitles in 5 Steps
1. Get a Free API Key
Sign up at AssemblyAI and copy your free API key from the dashboard. No credit card is required, and you get 100 hours of transcription every month at no cost.
2. Upload Your Audio File
Drag and drop your file, or click Browse to select an MP3, WAV, M4A, AAC, OGG, FLAC, or WEBM file. If you only have a video, use the “Extract Audio from Video” button instead.
3. Trim and Extract (Video Only)
If you started from a video,
a built-in trim bar lets you select exactly the part you need before extracting the audio — all inside your browser.
4. Choose the Audio Language
Leave it on Auto Detect for most cases, or manually pick from 45+ languages including Urdu, Hindi, and Punjabi for better accuracy.
5. Download Your Subtitles
Once transcription finishes, download your file as SRT for video platforms, LRC for music apps, or ASS for advanced subtitle styling.
Why This Audio to SRT Converter Stands Out
- Real AI Transcription — Powered by AssemblyAI's Universal-2 speech model, not a fake demo tool.
- 45+ Languages Supported — Including Urdu, Hindi, Punjabi, Arabic, and full auto-detection.
- Three Subtitle Formats — Export as SRT for video, LRC for music, or ASS for styled subtitles.
- Works With Video Too — A built-in extractor pulls audio from your video without leaving this page.
- Your Key Stays Private — Your API key is saved only in your own browser, never sent to our servers.
- Fast Turnaround — Most audio files finish transcribing within 30 to 60 seconds.
SRT vs LRC vs ASS — Which Subtitle Format Do You Need?
| 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 editing with custom fonts and effects |
Who Uses This Tool
- YouTubers who need accurate captions without paying for a captioning service
- Podcasters turning episodes into readable, searchable transcripts
- Content creators adding multilingual subtitles for a wider audience
- Students and researchers transcribing interviews or recorded lectures
Have a Video Instead of Audio?
Many people start with a video file rather than a standalone audio recording — a YouTube upload, a recorded lecture, or a podcast episode filmed on camera. Instead of hunting for a separate audio extractor, this page includes one built in. Click “Extract Audio from Video,” trim the exact part you need, and the extracted audio is sent straight into the converter above — no downloading, no re-uploading, and nothing ever leaves your device during extraction.
Frequently Asked Questions
Yes. The tool itself is completely free with no limit on how many files you convert. You only need a free AssemblyAI API key, which includes 100 transcription hours every month at no cost.
Yes. Real AI transcription requires a connection to AssemblyAI’s speech recognition engine, so you’ll need your own free API key from assemblyai.com.
MP3, WAV, M4A, AAC, OGG, FLAC, and WEBM files up to 20 MB are supported.
You can download your transcript as an SRT, LRC, or ASS file, depending on where you plan to use it.
Yes. Along with Urdu and Hindi, it supports Punjabi, Bengali, Arabic, and over 40 other languages, with automatic language detection available.
No. Your audio goes directly and securely to AssemblyAI for processing. It never passes through or gets stored on our server.
Yes. Your key is stored only in your own browser’s local storage and is never sent anywhere except AssemblyAI
Processing time depends on audio length and AssemblyAI’s current server load. Most files finish within 30 to 60 seconds.
Yes. Click “Extract Audio from Video” to open the built-in extractor. Trim your clip, extract the audio, and send it straight into the converter with one click.
MP4, MOV, AVI, MKV, WEBM, M4V, and FLV files up to 500 MB are supported for audio extraction.