CaptionAI - Auto Subtitles

CaptionAI - Auto Subtitles is an AI-powered auto caption generator and subtitle editor app for Android. Automatically generate accurate video captions and subtitles using on-device Whisper AI technology. No internet required, no subscription needed .

⚡ AUTO CAPTION GENERATOR

Generate automatic captions and subtitles for any video in seconds. Our advanced AI speech-to-text engine transcribes audio with high accuracy. Perfect auto subtitle generator for TikTok, Instagram Reels, YouTube Shorts, and all social media videos.

🎨 14+ PROFESSIONAL CAPTION STYLES

Choose from stunning subtitle style presets designed for every platform — TikTok captions, YouTube subtitles, Instagram story captions, cinematic titles, neon text, retro fonts, news ticker, minimal clean text, and more. One-tap caption styling that looks professional.

✏️ FULL SUBTITLE EDITOR

Complete caption editing tools — edit subtitle text, adjust timing, find and replace words, split and merge captions, undo and redo changes. Timeline editor with word-per-minute display. A powerful subtitle editor for Android.

🎬 VIDEO EDITOR WITH FILTERS

Built-in video editing tools — trim and cut video, adjust playback speed (0.5x to 2x), crop to any aspect ratio (9:16, 16:9, 1:1, 4:5). Apply color grading filters — adjust brightness, contrast, saturation. Video color presets: Vivid, Warm, Cool, Matte, Black and White, Vintage, Cinematic, Dramatic.

🔤 CUSTOM FONTS AND TEXT STYLES

Customize every aspect of your captions — choose fonts (Noto Sans, Anton, DM Sans, Montserrat, Roboto, Bebas Neue), change text color, add text stroke and outline, apply drop shadow, adjust font size, letter spacing, and line height. Bold, italic, uppercase text formatting.

📍 CAPTION POSITION AND BACKGROUND

Place subtitles anywhere — top, center, or bottom of video. Multiple background styles for captions: rounded box, pill shape, sharp rectangle, per-line highlight, full-width bar, or no background. Customize background color and opacity.

🌐 AUTO TRANSLATE CAPTIONS

Translate your video captions and subtitles to 12+ languages — Spanish, French, German, Hindi, Japanese, Korean, Chinese, Arabic, Portuguese, Italian, Russian, and more. Auto translation powered by on-device AI.

🎵 AUDIO TOOLS

Mute original audio, add background music, adjust audio volume, mix multiple audio tracks. Generate captions from added audio — perfect for voiceover videos and dubbed content.

💾 EXPORT AND SHARE

Export captioned videos in HD (720p) or Full HD (1080p). Export SRT subtitle files separately. Share directly to Instagram, TikTok, YouTube, Facebook, WhatsApp, and all social media apps. Add custom watermark to exported videos.

🔒 100% PRIVATE AND OFFLINE

All video processing and AI transcription happens entirely on your device. No cloud uploads, no data collection, no tracking, no analytics. Your videos never leave your phone. Complete privacy guaranteed.

📱 PREMIUM FEATURES — NO SUBSCRIPTION

• Auto caption generator with AI speech recognition

• Subtitle editor with timeline view

• Video trimmer and speed controller

• Color grading and video filters

• 14+ caption style presets

• Custom fonts and text effects

• Caption position and background customizer

• Auto translate subtitles

• Background audio mixer

• HD and Full HD video export

• SRT subtitle file export

• Share to all social media platforms

• What's New feature notifications

• Project history and caption library

• No ads, no watermark, no subscription

PERFECT FOR:

• Content creators and social media influencers

• TikTok and Instagram Reels creators

• YouTube and YouTube Shorts creators

• Video bloggers and vloggers

• Students and educators

• Social media marketers

• Podcast video creators

• Anyone who needs video subtitles and captions

Download CaptionAI - Auto Subtitles now and create professional captioned videos with AI-powered auto subtitles in seconds. An auto caption generator and subtitle editor for Android.