FAQ

How the lab measures a cue, and what the safe zone is not.

What does 20 characters per second mean?

The sample cue labeled Fast is 20.0 characters per second, above the default limit of 17. The first line in that sample is 81 characters, above the default of 42.

Are the safe zones official?

No. The overlay was reviewed on 4 November 2026 as an illustration: top 14 percent, bottom 22 percent, sides 6 percent. Platforms change their chrome. Check the current app before you burn captions in.

Does the video upload?

A file you pick plays in the 9:16 frame on this device. It is not sent to Caption Fit Lab.

What does the timing fixer change?

Shift moves every cue by the milliseconds you type. Trim ends an earlier cue 1 millisecond before the next start, and never shorter than 80 milliseconds. Export downloads an SRT.

Which languages is the interface in?

English. Spanish and Portuguese wait until local demand is measured, which is what the November 2026 plan says.

Do I have to click an ad to export?

No. The export button is separate from every unit labeled Advertisement. There is no reward for a click. Vignette is Auto ads only.