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 & Video to SRT, LRC & ASS Subtitle Converter
Upload an audio file — or a video, extract its audio right here first — 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. Only have a video file? No problem — a built-in audio extractor lets you pull the audio out of any video first, right inside this same page, then send it straight into the converter without downloading or re-uploading anything.
How to Convert Audio or Video to Subtitles in 5 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. Have a video instead? Use the "Extract Audio from Video" button below the upload box.
Trim & Extract (Video Only)
Inside the video popup, trim the exact part you need and extract its audio in one click.
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.
Works With Video Too
No audio file? Extract audio straight from any video, right inside this page, then convert it instantly.
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. If your subtitles are for a video project, you can extract the audio directly from that video using the built-in extractor above before generating your SRT file.
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.
Working With Video Content
Many creators start with a video file rather than standalone audio — a YouTube upload, a recorded lecture, or a podcast episode filmed on camera. Instead of using a separate converter, this page includes its own audio extraction step so the whole process, from video to finished SRT file, happens without leaving this page or juggling multiple tools.
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.
Can I generate subtitles from a video file instead of audio?
Yes. Click "Extract Audio from Video" above the upload area to open a built-in video-to-audio extractor. Trim your clip, extract the audio, then send it directly into this converter with one click — no downloading or re-uploading required.
Which video formats does the video-to-audio extractor support?
MP4, MOV, AVI, MKV, WEBM, M4V, and FLV files up to 500 MB are supported for audio extraction.
Related Free Tools
Ready to Convert Your Audio?
Scroll up, upload your audio file, and get accurate subtitles in SRT, LRC, or ASS format — completely free.
↑ Start Converting My Audio
Muhammad Usman
Building free, fast, and practical web tools for everyday users — from image converters to text utilities, designed to solve real problems without ads getting in your way.
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