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Subtitle Studio Subtitle QC

Subtitle QC: check your subtitles before you deliver

Free SRT check for editors: reading speed, line length, cue duration, overlaps and timecodes, before the file goes to Resolve, Premiere, YouTube or a client. Your file stays in your browser.

Check an SRT file

Limits

Your file stays in your browser: nothing is uploaded, stored or logged.

What does Subtitle QC check?

  • Timecodes and numbering. Invalid or missing timecodes, end time before start time, numbers that skip, and a dot where SRT expects a comma.
  • Reading speed (CPS). How many characters per second the viewer has to read. Above 17 it gets tight, above 20 most viewers drop out.
  • Lines and line length. Too many or too long lines cover the image and read restlessly.
  • Time on screen. Too short cannot be read, too long lingers while something else is already being said.
  • Overlaps and silences. Two subtitles at once, or a long silence where something may have dropped out.

Presets for your workflow

Editing in DaVinci Resolve, Premiere Pro or Final Cut, YouTube and web, vertical social video and a relaxed reading speed for education and accessibility. They are the same limits as in Subtitle Studio, so what you check here matches how Subtitle Studio makes subtitles.

Subtitles and WCAG

For prerecorded video with sound, WCAG 1.2.2 (level A) asks for captions. A readable pace and good timing are part of that in practice.

Frequently asked questions

Is my SRT file sent anywhere?

No. The check runs in your browser. The file is not uploaded, not stored and not logged. Our measurements never contain the text or the file name either.

What is CPS?

Characters per second: how many characters a viewer has to read per second. We count the visible characters (without formatting tags and line breaks) and divide by how long the subtitle is on screen.

Which limits do you use?

By default: at most 2 lines, 42 characters per line, reading speed to check from 17 and to fix from 20 characters per second, and 1 to 7 seconds on screen. For vertical video we use shorter lines and shorter cues. You can change everything yourself.

Are these official standards?

No, they are common working values and the same limits as the presets in Subtitle Studio. If you deliver to a broadcaster or platform with its own requirements, enter their values in the settings.

Can I send the report to a client?

Yes. The report contains the verdict, the limits used and, per cue, the issue and the advice, without the subtitle text itself.

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