STL to SRT Converter

You have captions in Spruce STL text and need universal SRT. The STL to SRT Converter reads each frame-based line and rebuilds SubRip.

For every line it takes the HH:MM:SS:FF,HH:MM:SS:FF timing, converts the frames to milliseconds at your chosen FPS, drops the comma/space wrapper and replaces it with an SRT timing line plus the --> arrow, numbers the cues sequentially, and restores multi-line text. Set the FPS to match the source and convert.

• Frame to ms: HH:MM:SS:FF becomes HH:MM:SS,mmm.
• FPS control: match the authoring rate.
• Renumbering: sequential cue indices added.
• Multi-line restore: breaks kept.
• Valid SRT: blank-line-separated cues.
• Private: parsed in your browser.

1. Paste your STL (sample preloaded).
2. Set the frame rate to match the source.
3. Click Convert to SRT and copy or download.

Example 1 — Back to SRT. An authored STL needs to play in a standard player.

Example 2 — Edit pass. Move captions into an SRT editor.

Example 3 — PAL source. Use 25 fps for European video.

• Universal output: SRT opens everywhere.
• Accurate timing: FPS-aware frames.
• No manual numbering: done for you.
• Lossless text: wording preserved.
• Private: stays in the browser.