Caption Fit Lab

News

Short notes on caption speed, safe zones, and SRT timing — each one links to a free checker.

Overlapping SRT cues: fix timing before you burn captions in

When two cues share the same second, players fight. Use the timing fixer on this site, then re-check speed.

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Characters per second for Shorts: a readable cue length

If a line flashes too fast, viewers miss it. Check characters per second before you burn captions in.

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Safe zone before burn-in: preview the 9:16 frame

Platform UI covers the bottom of Shorts and Reels. Preview captions inside the safe zone before you burn them into the video.

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Updated 12 November 2026.