High-Accuracy Transcription
Uses WhisperX with word-level timestamps for precise alignment
Powered by WhisperX AI
Upload an audio or video file — get transcript JSON, SRT, TXT and TikTok-style .ASS subtitles ready to use instantly
Features
Uses WhisperX with word-level timestamps for precise alignment
Generate word-by-word or pause-split subtitles in portrait or landscape
Thai, English, Chinese, Japanese, Korean and more with Auto-detect
No monthly subscription — buy credits and pay by actual minutes used
Already have a script? Let AI match timestamps to your audio without changing words
Download as JSON, SRT, TXT or ASS — all jobs saved in your Dashboard
FAQ
Everything you need to know about FastCaption
FastCaption is an AI-powered subtitle and caption generator. Upload any audio or video file and get accurate transcriptions with word-level timestamps in seconds. Export as SRT, ASS (TikTok-style), JSON, or plain text. Start free with 5,000 credits — no credit card required.
Yes! Every new account gets 5,000 free credits (approximately 25 minutes of transcription). No credit card required. After that, credit packs start at just $2.99 — no monthly subscription needed.
FastCaption uses WhisperX, one of the most advanced speech recognition engines, with word-level forced alignment. Expect 95%+ accuracy for clear audio in supported languages.
FastCaption supports 15+ languages including English, Thai, Japanese, Korean, Chinese, Spanish, French, German, Portuguese, Italian, Dutch, Russian, Arabic, Hindi, Vietnamese, and Indonesian. Language auto-detection is also available.
SRT (universal format for YouTube, Premiere Pro, etc.), ASS (with TikTok-style word-by-word highlighting), JSON (with word-level timestamps), and plain TXT transcripts.
Absolutely! FastCaption generates ASS subtitle files with trendy word-by-word highlighting effects. Choose portrait (9:16) orientation, download the ASS file, and import into CapCut, Premiere Pro, or any video editor.