Captionly - Video Captions, No Upload Required
Add captions to videos with AI - no uploads, no fees, all local.
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What is Captionly?
Captionly is an AI-powered captioning tool that runs entirely in your browser using local speech recognition. It processes videos without uploading any data to external servers, leveraging OpenAI's Whisper model for accurate speech-to-text conversion. Designed for content creators, videographers, and anyone needing to add professional captions to videos quickly and privately.
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Key Features of Captionly
- Local AI speech recognition (Whisper model)
- 100% in-browser processing
- Customizable caption styling (fonts, colors, size, position)
- Multiple AI model sizes (Tiny, Base, Larger)
- Real-time style preview
- WebM and MP4 video export
- SRT subtitle file export
- Word-by-word and line-by-line caption modes
- Karaoke mode with active word highlighting
- Text outline for readability over bright footage
- 5-minute segment processing for longer videos
Who Should Use Captionly?
Add captions to YouTube videos and shorts
Create accessible video content for deaf and hard-of-hearing viewers
Generate subtitles for educational videos and tutorials
Caption social media video content (TikTok, Instagram, LinkedIn)
Add multilingual subtitles to presentations
Karaoke-style captions for music or performance videos
Captionly: Pros & Cons
✓Pros
- Completely free and ad-free
- No data uploads - all processing happens locally
- No subscription required
- Fast processing with browser caching
- Flexible AI model selection for different performance needs
- Extensive caption customization options
- Real-time preview of styling changes
- Supports common video formats (MP4, WebM)
- Generates standalone SRT files
✕Cons
- Requires sufficient browser memory for larger AI models
- Longer videos processed in 5-minute segments
- Dependent on browser capabilities
- Initial model download required on first use
Frequently Asked Questions about Captionly
Does Captionly upload my videos to the cloud?
No. Everything happens locally in your browser - nothing is uploaded anywhere.
What video formats does Captionly support?
MP4 and WebM formats with an audio track work best.
How long does caption generation take?
It depends on video length and the AI model selected. Longer videos are processed in 5-minute segments for better performance.
Can I customize the caption appearance?
Yes. You can customize fonts, colors, size, position, background opacity, text outline, and more. Changes apply live in the preview.
Is Captionly really free?
Yes, it's completely free and ad-free. You can optionally support the developer via "Buy me a coffee."
Tool Details
- Pricing
- Free
- Category
- Ai Video Translator
- Added
- Jul 2026
- Last Updated
- Jul 2026
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