Free Online Subtitle Converter
Convert subtitle files between SRT, VTT and ASS formats in milliseconds. Auto-detects the input format, preserves timestamps and Unicode — runs entirely in your browser, no upload, no signup.
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Convert Your Subtitles
Upload an SRT, VTT or ASS file, pick a target format, and download the converted version instantly.
Drop your subtitle file here
or click to browse files
Supports .srt, .vtt, .ass and .txt
Done editing? Let AI do the reading
Your file is ready — now turn it into something you can search, quote, and share in one click.
Features
Every Common Subtitle Format
SRT, VTT and ASS — auto-detected on upload, freely converted between any pair. No manual parsing, no broken timestamps.
SRT (SubRip)
The desktop standard used by Premiere, DaVinci Resolve, VLC and most editing software.
VTT (WebVTT)
The web standard for HTML5 video — required by every modern browser-native player.
ASS (Advanced SubStation Alpha)
The styled-subtitle format used by anime fansubs, MKV releases and Aegisub workflows.
Accurate & Lossless
Millisecond-precise timestamp conversion and full Unicode support. Your subtitles come out exactly as they went in — only the wrapper changes.
Timestamp Precision Preserved
Comma vs dot vs hundredths — the converter handles every format's quirks without losing a single millisecond.
Full Unicode Support
Chinese, Japanese, Korean, Arabic, Thai, emoji — every character is preserved byte-for-byte.
Auto Format Detection
Drop any subtitle file and we detect SRT, VTT or ASS automatically — no need to label it.
100% Private & Free
Your subtitles never leave your device — everything runs as plain JavaScript inside the browser tab.
Zero Server Upload
Files are read, parsed, converted and written back entirely on your own machine.
Instant Download
Conversion completes in milliseconds — click and the new subtitle file is ready.
Works Everywhere
Any modern browser — desktop or mobile. Chrome, Firefox, Safari, Edge.
Loved by creators, students & researchers
Why people use BibiGPT to turn videos into text every day.
Trusted by 50,000+ users worldwide
“I paste a link and get clean captions in seconds — it saves me hours of retyping every single week.”
Maya R.
Content Creator · Repurposes short videos
“Exporting the transcript lets me review new words at my own pace instead of pausing the video constantly.”
Daniel K.
Language Learner · Studies with real videos
“Accurate, timestamped text I can quote directly. It has quietly become part of my daily workflow.”
Priya S.
Researcher · Cites public talks
FAQ'S
Frequently Asked Questions
Ask us anything!
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Turn Any Video Into Subtitles — Free
Sign up free to pull subtitles straight from any YouTube, Bilibili, TikTok or podcast link — then get an instant AI summary, transcript and mind map. No watermark, no card required.