Free · no account · nothing stored

Catch subtitle delivery errors before your client does.

Check an SRT, ASS, EBU-STL, TTML or WebVTT file against the exact requirements of a broadcaster or streaming platform, or as a mezzanine against its own format. Every issue comes with the rule, the subtitle and the fix.

Formats: 5
Delivery profiles: 40
Validation rules: 18

01 Subtitle file

Accepted: .srt, .ass, .ssa, .stl, .ttml, .dfxp, .xml, .itt, .vtt, .webvtt. Read in memory for this check only.

Subtitle language (optional)

For formats that do not declare one (SRT, ASS, WebVTT), or to override the file's declaration. Compared with the profile language.

02 Delivery target or mezzanine

Where is this file going?

verified verified reviewed reviewed unverified unverified What these mean

Selected profile

BBC Subtitles English (UK), EBU-TT-D

bbc-subtitle-en-gb-ebuttd@1.2.5 · ebuttd · specification reviewed · interoperability unverified

View profile rules

In memory only. Nothing is stored.

Profiles that cite their sources

Every rule traces back to a published specification, with its version, retrieval date and verification status.

The production engine

The same CueNorm Core that generates broadcast deliverables: exact timing, character counts that match what viewers read, EBU-STL byte fidelity.

Unreleased content stays yours

No account, no retention, no training on your subtitles. The report is built during the request and handed back to you.