Overview
BibiGPT’s Free Online Subtitle Burner uses ffmpeg.wasm to permanently hardcode SRT, VTT, or ASS subtitle files into your video — directly in the browser. Supports MP4, MKV, AVI, and MOV files. Customize font size, color, and position. No server upload, no watermark, no sign-up required.Pain Point
You need to share a video with burned-in subtitles for social platforms that don’t support external subtitle tracks, or for viewers who watch without sound. Most tools either require paid software or upload your video to a remote server.Key Features
- Supports SRT, VTT, and ASS subtitle formats
- Hardcode subtitles into MP4, MKV, AVI, and MOV videos
- Customize font size, color, and vertical position
- Powered by ffmpeg.wasm — all processing in the browser
- No watermark, no sign-up, no server upload
Highlights
Browser-local ffmpeg.wasm processing means even large video files stay private. ASS format support allows richly styled subtitles with custom fonts, colors, and positioning.Use Cases
- Social Media Creators: Burn captions into short-form videos for Instagram, TikTok, and YouTube Shorts where auto-captions are unreliable
- Educators & Trainers: Add permanent subtitles to instructional videos for accessibility
- Localization: Burn translated subtitles into videos for different regional audiences
Tips
- For best visual quality, use ASS format with your preferred font settings
- Processing time scales with video length and resolution; shorter clips finish faster
- Preview the subtitle positioning before downloading to avoid re-processing
Related Feature: Free Subtitle Converter — Try it now Upgrade to Pro: Unlock unlimited usage → View Pricing