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About Add Subtitles to Video — Free Online Tool
Add Subtitles to Video puts an SRT, VTT or ASS caption file onto a video, either burned into the picture or added as a track the viewer can switch off.
The two modes behave very differently. Embedding converts the captions to mov_text and adds them beside the existing streams with no re-encoding at all, so it finishes quickly and the viewer keeps control of whether captions show. Burning renders the text onto the frames with libass, which means the whole video is re-encoded and the captions can never be turned off again; font size, vertical margin and a two-pixel outline are the settings exposed, and with no font file supplied the engine falls back to its own built-in face. A caption file with no timecodes in it, or an empty one, is rejected by name before any encoding begins.
The video and the caption text are both read inside the page. Subtitles are frequently a transcript of an entire conversation, and none of that transcript is transmitted.
Captioning a clip for a platform that strips subtitle tracks, burning in captions for a feed that autoplays muted, adding a switchable track for accessibility, and checking subtitle timing against the picture before publishing.
Also known as: burn in subtitles · add captions to video · hardcode srt · video subtitles
When to use it
Feeds autoplay muted by default, so captions are what carry the message until someone turns the sound on.
How it works
Renders vector typography onto video frame bitmaps according to SRT millisecond start/end timestamps.
Hardcoded Captions
Burned-in captions are part of the picture, so they still appear where a platform offers no caption track.
How to Use Add Subtitles to Video in 4 Easy Steps
Follow this simple guide to process your files in seconds directly inside your browser tab.
Select or Drop Your MP4/MOV/WEBM
Drag and drop your MP4/MOV/WEBM directly into the Add Subtitles to Video workspace above or click 'Choose files'. You can process up to 2 files in a single run.
Configure Your Preferences
Adjust the available optimization sliders, target formats, or custom options. Feeds autoplay muted by default, so captions are what carry the message until someone turns the sound on.
Instant In-Browser Execution
The client-side engine executes Add Subtitles to Video locally on your device hardware with zero server latency and 100% private in-memory sandboxing.
Preview & Download MP4
Inspect the processed file, compare file size savings or output quality, and click Download to save the finished MP4 file directly to your disk.
Why Use Add Subtitles to Video on ShortTrick
Engineered for maximum speed, strict privacy, and frictionless digital productivity.
100% Private & Local
Files processed with Add Subtitles to Video never leave your computer or phone. Zero cloud uploads, zero tracking, and zero risk.
Blazing Fast Engine
Powered by compiled WebAssembly code running directly in your browser with sub-second execution for Add Subtitles to Video.
No Paywall or Account Required
Add Subtitles to Video is completely free with no hidden charges, watermarks, email signups, or artificial daily limits.
High-Fidelity Quality
Advanced algorithms preserve crisp vector text, clear colors, and structural layout integrity.
Generous 300 MB Size Limit
Handle files up to 300 MB and process up to 2 files in convenient batches with Add Subtitles to Video.
Cross-Device Compatibility
Runs seamlessly in modern browsers on Windows, macOS, Linux, iOS (iPhone/iPad), and Android.
Supported Formats & Limits
Designed for high performance with browser-side memory guarantees.
300 MB
2
Frequently Asked Questions About Add Subtitles to Video
Common questions regarding Add Subtitles to Video, data privacy, file format compatibility, and usage limits.
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