Hardcode Czech subtitles into video

Burn-in (hardcoded) subtitles are permanently embedded in the video pixels and cannot be turned off. Soft subtitles (SRT/VTT) are separate files that viewers can toggle on/off. Burn-in is ideal for social media where caption support is inconsistent.

Yes! Sonix offers extensive styling options including font family, size, color, background color, opacity, and position (top, middle, bottom). Preview your style in real-time before rendering.

Sonix preserves your original video quality during the burn-in process. We use high-quality rendering to ensure subtitles look crisp and professional without degrading your footage.

Processing time depends on video length and resolution. A typical 10-minute 1080p video takes about 5-10 minutes to render. You'll receive an email notification when your video is ready.

Sonix exports burned-in videos as MP4 files with H.264 encoding—the most universally compatible video format. Your video will play on virtually any device or platform.

No. Once subtitles are burned in, they're permanent. We recommend thoroughly reviewing and editing your transcript in the Sonix editor before rendering. You can always create a new burn-in version if needed.

Yes. Upload your Czech audio or video file, select Czech as the spoken language, and Sonix returns a transcript you can edit in the browser and export to formats like Word, SRT, and VTT.

Czech speech recognition is built around standard Czech, so regional dialects and colloquial Common Czech forms may need review. The Sonix editor syncs text to audio, making it straightforward to check and correct dialect passages.

Czech and Slovak are separate language selections in Sonix, so choose the language most of the recording is spoken in. For conversations that switch between the two, transcribing each file under its dominant language gives the cleanest starting point.