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CueNorm Public Validator

BBC

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

BBC online-only subtitle delivery profile, EBU-TT-D 1.0.1 and IMSC 1.0.1 text

Validate a file with this profile bbc-subtitle-en-gb-ebuttd@1.2.5
Format
ebuttd
Destination
BBC
Language
en-GB
Specification
reviewed
Interoperability
unverified
Last checked
2026-09-30

Validation rules

RuleSeverityParametersApplies when
MAX_CHARACTERS_PER_LINE warning max=37 always
MAX_LINES warning max=2 always
ALLOWED_TEXT_COLORS error colors=#ffffff #ffff00 #00ffff #00ff00 always
ALLOWED_CHARACTERS error characters=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 !)(,.?:-><&@#%+*=/£$¢¥©®¼½¾™'"€♫←→ always

Always checked

Whatever the profile's rules: how the file is read (file reading, FILE_FORMAT_MISMATCH, NO_SUBTITLES_READ), the timing of a delivery (NON_POSITIVE_DURATION, SUBTITLES_OUT_OF_ORDER, SUBTITLE_OVERLAP) and the language of the subtitles (SOURCE_LANGUAGE_MISMATCH).

Sources

  1. BBC

    official

    BBC Subtitle Guidelines, 1.2.5 (March 2026)

    Retrieved 2026-09-30 Open source document

This is a CueNorm profile based on published specifications. It is not endorsed by BBC.

Resolved profile hash, recorded in every report and deliverable:

adad26412da4b3543d23be09d10f7cbae002af8e3a2f1a352ee202a806512c19