Subtitles that pass QC the first time.

Drop in an SRT, VTT or ASS file. Subtidy rebalances long lines, gives fast cues room to breathe, closes overlaps and checks every caption against the frame.

Open subtitle files

Files are processed in your browser and never uploaded. Exports open in Premiere Pro, DaVinci Resolve, Final Cut Pro and YouTube.

Fails QCPasses QC 1 line, 69 characters, 28 per second2 lines, 36 characters max, 17 per second

00:00:03:12

Welcome back. Today we're looking at why most subtitle files fail QC.

Rebalanced, not just wrapped

Line breaks land on natural pauses. Cues that need too many lines are split, with their timing shared out by length.

Timing people can read

Fast cues borrow time from the gaps around them. Overlaps close, and every cue keeps a clean gap before the next.

Checked against the frame

Preview any cue in 16:9 or 9:16 and see when a line runs past title safe or under the app buttons on Reels and TikTok.

Private by default

Everything runs on your machine. Client subtitles never touch a server, so there is nothing to sign before you use it.

Workspace

Drop subtitle files anywhere on the page. Change a rule and every file updates instantly.

Rules

Style Streaming42 characters, 20 per second Broadcast37 characters, 15 per second Social vertical28 characters, 17 per second CustomYour own limits below

Limits

Characters per line

chars

Lines per cue

lines

Reading speed

cps

Shortest cue

sec

Longest cue

sec

Gap between cues

Fixes

Rebalance line breaks Split overfull cues Fix overlaps and reading time Remove [MUSIC] tags and speaker names Remove italics and styling

Timing

Shift all cues

Frame rate conversion

Export

Drop SRT, VTT or ASS files

Add a whole series at once. Each file gets its own report, and you can download them together.

Browse files

Or paste subtitle text

Add files

Timeline

PassesNeeds a look

Cues

Only problems

#	Timing	Text	Reading speed	Notes