Subtitle quality · made readable

Subtitle reading speed checker, QC tools & standards

Free subtitle reading speed, line length and timing tools for SRT and WebVTT, plus Netflix and BBC standards and a QC checklist.

Tools

Drop a file, get a report

The full tool. Check CPS, line length, line count, invalid timing and overlaps in SRT or WebVTT.

Drag in an SRT and get an instant characters-per-second report.

A VTT-first checker that handles cue settings and formatting tags.

A focused, lightweight check for the 42-character and two-line limits.

Reference numbers from Netflix & BBC

20 CPS adult, 17 children, 42 chars per line.

160–180 WPM, 37 characters per line.

The origin and how platforms differ.

5/6 second minimum, 7 seconds maximum.

The 2-frame rule at any frame rate.

Quick sums for a single cue

Text + time → characters per second.

Text + CPS → minimum display time.

Upload a file, get a deliverable report.

Process and long-tail help

The complete, downloadable sign-off list.

Batch QC workflow for localization teams.

Fix the common auto-caption problems.