Dashboard
Subtitle Burner
Video Subtitle & Caption Burner
Upload video files, import SRT caption tracks, customize typography overlays, and burn subtitles directly into video frames locally.
100% Offline
Business
1. Upload Files
Auto-Subtitle Generator
AI Local
Loading AI Model...
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2. Caption Typography
Playback controls
Subtitle burning and rendering video in progress... Do not close tab.
Video Viewport Canvas Not Loaded
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Caption Editor & Timeline
0 subtitles loaded
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Format: Standard SRT subtitle timing block.
Click a card to jump to that segment.
Real-time tracking
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Frequently Asked Questions
Quick direct-answer guides about using this utility tool locally and securely.
What caption format does this subtitle burner support?
We support standard SubRip (.srt) caption files. You can upload an existing .srt file or write/edit the captions manually in the text area editor on screen.
Will burning subtitles degrade the original video quality?
Since the video is re-rendered frame-by-frame on a canvas at its native resolution, there might be a minor change in compression quality depending on browser-native video encoders, but the visual text overlay will remain sharp.
What does it mean to "burn" subtitles into a video?
Burning subtitles means permanently embedding the caption text directly onto the video frames themselves, so it becomes part of the picture. Unlike soft subtitles stored in a separate file, burned-in (hardcoded) captions show on every device and platform, with no separate file needed.
What is the difference between hardcoded (burned) and soft subtitles?
Soft subtitles are stored as a separate file (like .srt) that viewers can toggle on or off, while hardcoded subtitles are permanently rendered into the video image and can't be turned off or removed. Burned-in subtitles are essential for platforms with inconsistent caption support, like Instagram and TikTok.
Can I edit subtitles after burning them into a video?
No, once subtitles are burned in, they become a permanent part of the video image and can't be edited separately — always download or keep a copy of your original .srt file in case you need to make changes and re-burn later.
Is my video uploaded to a server when burning subtitles?
No, KuberAgent processes your video and subtitles entirely in your browser, so your video file never leaves your device — unlike most subtitle burners that upload your video to a remote server for rendering.
Why should I burn subtitles instead of just uploading an SRT file separately?
Many platforms, including Instagram and TikTok, don't support separate subtitle files at all, so burning ensures your captions are always visible — this also matters for silent autoplay, since most viewers watch social videos with sound off and rely entirely on visible captions.
Can I customize the font, color, or position of burned subtitles?
Yes, you can adjust caption styling like font, size, color, and position before burning, letting you match the look of your video and ensure the text stays readable against any background.
What video formats does this subtitle burner support?
KuberAgent supports common video formats including MP4, MOV, and WebM for burning subtitles directly in your browser.