How Browser-Based Subtitle Processing Works

VidStudio uses FFmpeg compiled to WebAssembly to handle all subtitle and text operations directly in your browser. Upload a video and subtitle file, choose your processing mode, and get results without any server uploads. Whether you are burning SRT captions into a video, adding styled ASS subtitles, extracting existing tracks, or creating animated text effects, the processing runs locally on your device. This means your content stays private and there are no file size limits imposed by a server.

About Subtitles & Text

Text Overlay

Add custom text directly to video with FFmpeg's drawtext filter. Control font, color, position, timing, and display dynamic content like timecodes.

Subtitle Files

Work with standard subtitle formats (SRT, ASS, VTT). Burn subtitles into video, add as separate tracks, extract from videos, or convert between formats.

Text Effects

Create animated text like scrolling credits, typing reveals, and fade effects. Perfect for intros, outros, and creative video content.

Common Use Cases

Add Captions for Accessibility

Burn-in or embed subtitle tracks to make your videos accessible to deaf and hard-of-hearing viewers.

Social Media Captions

Add permanent burned-in captions for platforms where viewers watch with sound off, like Instagram and TikTok.

Video Intros & Credits

Create professional-looking title sequences and scrolling end credits with animated text effects.

Translate Subtitles

Extract existing subtitle tracks, translate the text, and burn the new subtitles back into the video.

Related Tools

Audio Processing

Extract, mix, and apply effects to audio tracks. Pair with subtitles for complete audio and text editing.

Watermark

Add image or text watermarks with positioning, transparency, and timing controls to brand your video content.

Resize & Scale

Change the resolution or aspect ratio of your video for different platforms after adding your subtitles and text.