Add AI Captions & Subtitles to Video
Automatically on iOS & Android
Turn raw talking-head speech into high-retention video content with word-by-word highlighted karaoke subtitles. Designed for mobile creators to maximize watch time on TikTok, Reels, and Shorts.
100% Free Download • Karaoke Subtitles • Watermark-Free HD Export • Login-Free
Customize Your Creator Vibe
Test different typography and styles in real time.
Features Built for Maximum Video Content Retention
Everything social content creators need to convert raw speech into engaging text, subtitles, and karaoke captions.
Word-by-Word Karaoke Sync
Active spoken words illuminate in real-time as you speak, keeping your video audience focused and driving up completion rates on TikTok & Reels.
Custom Creator Styling
Select viral creator font styles, outline text borders, and backdrop shapes to align perfectly with your personal brand aesthetics.
Optimized Vertical Subtitles
Designed specifically for 9:16 vertical video clips on iOS and Android with automatic UI safe-zone padding.
AI Autocaption Speech Engine
State-of-the-art neural audio recognition translates spoken video speech into stylized text captions with frame-perfect precision.
How to Add Auto Captions & Subtitles in Seconds
Create professional viral captions right on your mobile phone without complex desktop software.
Import Video Clip
Select any spoken talking-head video from your iPhone or Android camera roll.
Auto-Generate & Style
Captrix automatically transcribes speech into text and applies karaoke highlight colors.
Export Watermark-Free
Save your finished HD captioned video directly to your photo library for instant sharing.
Frequently Asked Questions
Captrix uses state-of-the-art AI speech models to analyze the audio track of your video and generate frame-accurate word timing. It then renders stylized, karaoke-style subtitles directly onto your video clip.