Free AI Auto Captions
& Viral Video Subtitles
Turn your raw talking-head footage into engaging, highly-retainable content. Captrix instantly adds flawless AI-generated captions and trending karaoke subtitles for Instagram Reels and YouTube Shorts.
100% Free on iPhone & Android • Export HD Watermark-Free
See the Captrix Difference
Over 85% of social media users watch videos on mute. Drag the glowing divider below to compare plain raw video vs Captrix AI viral karaoke captions.
Viewers drop off after 3 seconds without dynamic visual captions.
Word-by-word karaoke animations lock viewer attention till the end.
Customize Your Creator Vibe
Test different typography and styles in real time.
Core Engine Features
Powered by state-of-the-art speech AI, Captrix automatically syncs dynamic, high-retention text animations in real-time.
AI Speech-to-Text
Extract 99.9% accurate text transcripts from any spoken video in seconds.
Transcribe Tool →Dynamic Auto-Captions
Automatically generate word-by-word highlighted karaoke subtitles.
Explore Captions →Precision Timeline Trimming
Cut awkward silences, pauses, and mistakes with single-tap mobile timeline tools before captioning.
Try Trimmer Demo →Cut Dead Space in 1 Tap
Long pauses and awkward silences ruin video retention. Drag the handles directly on the timeline track below to trim clips with instant precision.
How to Add Captions in 1 Tap
From raw mobile footage to a scroll-stopping viral hit in under 60 seconds.
Import Spoken Video
Select any vertical or landscape talking-head clip from your mobile camera roll.
Snip Awkward Silences
Captrix AI automatically scans audio tracks to cut dead pauses, keeping your hook tight.
AI Transcribe & Style
Generate 99.9% accurate karaoke subtitles. Apply trending creator fonts and color glows
Export & Go Viral
Export in crystal-clear 1080p HD watermark-free. Share directly to TikTok, Reels, or Shorts.
Frequently Asked Questions
Yes! Captrix is completely free to download on both the Apple App Store and Google Play Store. You can generate auto-captions, trim videos, and export watermark-free HD videos right from your phone.
Ready to Make Your Videos Go Viral?
Download Captrix AI on iPhone or Android and start creating free auto-captions in seconds.