Free AI image generation from Japanese text and reference images
AI caption and subtitle generator that adds captions to videos in seconds with no watermark
Stage
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Founded
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Based in
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Pricing model
Free
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Pricing
Free trial with generated credits upon registration; credit requirements vary by model, resolution and quality settings, visible before generation.
Free: 30 minutes of captions per month, 1080p MP4 export up to 3 minutes, 8 caption styles, SRT/VTT/TXT downloads up to 30 minutes, free translation into 100+ languages. Pro: $6.99/month (limited-time price, normally $9.99) or $59/year, unlimited captions on videos up to 90 minutes, all 22 caption s
Key features
Japanese language prompts for image generation
Multiple AI models including GPT Image and Nano Banana
Adjustable aspect ratios and composition settings
Reference image upload for style and composition guidance
Prompt gallery with examples to learn from
Customizable resolution and quality settings
Image history and download functionality
Background removal tool
Automatic speech transcription in 100 languages with automatic language detection
SRT, VTT and TXT subtitle file downloads
Free translation into 100+ languages
Copy caption style from screenshot functionality
Bilingual captions showing two languages simultaneously on Pro
Video processing entirely in browser with audio-only server transmission for privacy
Word-level timing synchronization for precise caption timing
What makes it different
Japanese-language prompt support eliminates need for English translation
Iterative refinement workflow allows gradual adjustment of composition, color and style
Gallery of example prompts helps users learn effective prompt writing without starting from scratch
Credit system shows generation cost before processing, with automatic refund on failed attempts
Fastest among 10 tested caption tools, 6.7× faster than CapCut and 4.7× faster than VEED
Highest accuracy with 5.7% word error rate in October 2026 accuracy test of 8 caption tools
Video stays entirely private with only audio sent for transcription
AI Gazou®
Captions Generator