Documentation Index
Fetch the complete documentation index at: https://docs.bibigpt.co/llms.txt
Use this file to discover all available pages before exploring further.
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