Free AI Caption & Voiceover

Sy System

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About this app

Video Caption Adder – AI Auto Captions, Subtitles & Voiceover Video Editor

Turn any video into a caption-ready, multi-language masterpiece — right on your phone! Video Caption Adder is the all-in-one AI video editor for auto captions, subtitles, voiceovers & translation. No internet, no cloud uploads, no waiting — everything runs 100% on-device for total speed & privacy.

AI AUTO CAPTIONS & SUBTITLES
• Auto-generate accurate captions from any video's audio using on-device AI speech recognition
• Auto-detect the spoken language or choose from 30+ languages manually
• Translate captions to English instantly — perfect for reels, vlogs & multilingual content
• Word-level timing keeps captions perfectly in sync with speech
• Detect different speakers automatically for interviews, podcasts & multi-person videos
• Export captions as burned-in (hardcoded) video or as a standalone SRT file

AI TEXT-TO-SPEECH VOICEOVER
• Add natural-sounding AI voiceovers in 8+ languages including English, Spanish, French, Hindi, Italian, Portuguese, Japanese & Chinese
• Choose from 50+ unique AI voices — male, female & regional accents
• Voiceover audio stays perfectly synced with your video timeline
• Great for tutorials, product demos, faceless YouTube/TikTok/Reels content & audiobooks

FULL CAPTION CUSTOMIZATION
• Animated caption styles — Classic, Pop & Karaoke word-highlight effects
• 12+ premium fonts: bold, sci-fi, playful, minimal & more
• Full color picker + outline/stroke controls for perfect readability
• Auto-emoji insertion adds personality to your captions automatically
• Save your favorite look as a reusable style template for one-tap styling next time

POWERFUL VIDEO EDITING TOOLS
• Trim & cut clips with precision
• Auto-remove silence & dead air for tighter, faster-paced videos
• Crop to any aspect ratio — 9:16 for Reels/Shorts/TikTok, 1:1 for feed posts, 16:9 for YouTube
• Add a watermark or logo overlay to protect & brand your content
• Mix in background music with automatic audio ducking under voiceover & speech
• Full undo/redo support so you can experiment worry-free

PRIVATE & OFFLINE BY DESIGN
• Speech-to-text, translation, text-to-speech & speaker detection all run locally on your device
• Your videos, audio & captions never leave your phone — no account, no sign-up, no cloud storage required
• Fast exports powered by an on-device video processing engine

WHY CREATORS LOVE VIDEO CAPTION ADDER
• Boost engagement & watch-time with auto-captioned, accessible videos
• Save hours vs. manual subtitle typing or paying a captioning service
• One app for captions + subtitles + voiceover + translation + editing — no need to juggle multiple tools
• Works great for content creators, marketers, educators, podcasters & social media managers

PERFECT FOR:
Instagram Reels • TikTok • YouTube Shorts & long-form • Facebook Video • Podcasts & interviews • Course & tutorial videos • Product demos • Multilingual audiences

Download Video Caption Adder today & start creating scroll-stopping, caption-perfect videos — fast, free & fully offline!

What’s new

First release of Free AI Voiceover & Caption