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CueNorm Public Validator

Netflix

Netflix Subtitles English

Netflix English (US and UK) subtitle delivery profile, TTML

Validate a file with this profile netflix-subtitle-en@2025.12
Format
ttml
Destination
Netflix
Language
en
Specification
reviewed
Interoperability
unverified
Last checked
2026-09-30

Validation rules

RuleSeverityParametersApplies when
MAX_CHARACTERS_PER_LINE warning max=42 always
MAX_LINES error max=2 always
MAX_READING_SPEED error cps=20 always
MINIMUM_DURATION error duration=0.833 s always
MAXIMUM_DURATION error duration=7.000 s always
MINIMUM_GAP error duration=0.083 s always
FORBIDDEN_CHARACTERS error characters=– — always
FORBIDDEN_STYLE error style=color 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. Netflix

    official

    Timed Text Style Guide: General Requirements

    Retrieved 2026-09-30 Open source document

  2. Netflix

    official

    Timed Text Style Guide: Subtitle Timing Guidelines

    Retrieved 2026-09-30 Open source document

  3. Netflix

    official

    English (USA) Timed Text Style Guide

    Retrieved 2026-09-30 Open source document

  4. Netflix

    official

    English (UK) Timed Text Style Guide

    Retrieved 2026-09-30 Open source document

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

Resolved profile hash, recorded in every report and deliverable:

806b51791ecd045034432f18a5a71518ffaca0d94e8fa93eb7d2e1a8a2605661