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SRT format, which works with VLC, Premiere, DaVinci Resolve, and every major video player and editor.

No. This tool extracts soft subtitles embedded as a separate track in the container. Hardcoded subs baked into the video frames require OCR, which is a different tool.

Yes. MKV files commonly have embedded subtitle tracks. MP4 files sometimes do. If there are no embedded subs, use our AI Video Subtitler to generate them.

MKV, MP4, WebM, and AVI files up to 2GB. MKV is the most common format with embedded subtitle tracks.

In VLC, go to Subtitle > Sub Track. If you see subtitle options, the video has embedded subs that can be extracted.

If the video contains multiple subtitle tracks, the first available track is extracted. Multi-track extraction is planned.

By default, FFmpeg runs via WebAssembly in your browser. On some devices, processing may use our secure server.

Yes, but be mindful of file size on mobile. Large MKV files (1GB+) may be slow on phones with limited RAM.

Use MiOffice AI Video Subtitler instead. It uses speech recognition to create subtitles from audio, even for videos with no embedded subs.

Up to 2GB per file. Extraction only reads the subtitle stream, so even large files process quickly.