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Technical subtitle services with a defined scope

Each service below lists exactly what is included, what you receive and what we need from you. Services can be combined into a single quotation.

Subtitle File FormattingSRT File ConversionWebVTT File ConversionTimestamp SynchronizationSubtitle Structure ValidationTranscript-to-Subtitle Processing

Subtitle File Formatting

Line length, line breaks, reading-speed and layout rules applied consistently across your subtitle files.

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Scope

  • Line-length limits applied per your style guide (e.g. 32, 37 or 42 characters)
  • Maximum two lines per cue unless otherwise specified
  • Logical line breaks that keep phrases and names together
  • Reading-speed (characters per second) checks and adjustments
  • Consistent punctuation, italics and speaker-label conventions

Deliverables

  • Formatted subtitle files in the agreed format (.srt or .vtt)
  • Cue numbering and spacing normalized
  • Short summary of the rules applied

Client provides

  • Existing subtitle files or approved transcript text
  • Your style guide or formatting preferences (or use our standard profile)
  • Target platform, if relevant

SRT File Conversion

Conversion of caption and subtitle data into clean, standards-conformant SubRip (.srt) files.

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Scope

  • Conversion from WebVTT and structured text/timed text supplied by the client
  • Correct HH:MM:SS,mmm timestamp syntax with comma separators
  • Sequential cue numbering and blank-line cue separation
  • Removal of unsupported styling, positioning and metadata
  • UTF-8 encoding to preserve accented and special characters

Deliverables

  • Validated .srt files, one per source file
  • Naming convention matching your source files or a specified pattern
  • Notes on any content that could not be represented in SRT

Client provides

  • Source caption files or timed data
  • Encoding information if not UTF-8
  • Preferred file naming convention

WebVTT File Conversion

Conversion into Web Video Text Tracks (.vtt) for HTML5 players, learning platforms and web video.

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Scope

  • Conversion from SRT and other timed text supplied by the client
  • WEBVTT header and HH:MM:SS.mmm timestamp syntax with period separators
  • Optional cue identifiers, settings (position, line, align) where requested
  • Character escaping for &, < and > in cue text
  • Checks for player compatibility issues such as malformed cue blocks

Deliverables

  • .vtt files ready for use with the HTML5 <track> element
  • Optional cue-setting profile applied consistently
  • Conversion notes for any unsupported source features

Client provides

  • Source subtitle files
  • Target player or platform (if specific requirements apply)
  • Any required cue positioning or styling rules

Timestamp Synchronization

Correction of timing offsets, drift and overlapping cues so subtitles match the supplied media.

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Scope

  • Global offset correction (subtitles consistently early or late)
  • Frame-rate drift correction (e.g. 23.976 vs 25 fps sources)
  • Resolution of overlapping cues and minimum gap enforcement
  • Minimum and maximum cue-duration rules
  • Spot checks against the supplied media file at defined intervals

Deliverables

  • Re-timed subtitle files in the original or requested format
  • Summary of the timing adjustments performed

Client provides

  • Subtitle files to be synchronized
  • Access to the corresponding media file or reference timings
  • Frame rate of the final media, if known

Subtitle Structure Validation

Technical inspection of subtitle files for structural errors before they reach your platform or player.

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Scope

  • Syntax checks: timestamps, separators, cue numbering and headers
  • Detection of overlapping, zero-length or out-of-order cues
  • Encoding and byte-order-mark (BOM) checks
  • Line-length, line-count and reading-speed reports against your limits
  • Optional correction of all detected issues

Deliverables

  • Validation report listing each issue with its cue reference
  • Corrected files (when correction is included in the scope)

Client provides

  • Subtitle files to validate
  • Validation rules or platform specification to test against

Transcript-to-Subtitle Processing

Segmentation of client-supplied, approved transcripts into properly timed and formatted subtitle cues.

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Scope

  • Segmentation of transcript text into readable subtitle cues
  • Timing of cues against the supplied media file
  • Application of line-length, line-break and reading-speed rules
  • Speaker labels or dashes for dialogue, as specified
  • Export to .srt, .vtt or both

Deliverables

  • Timed, formatted subtitle files in the requested format(s)
  • Quality-control checklist confirmation

Client provides

  • Final, approved transcript text (we do not create or translate the transcript)
  • The corresponding media file
  • Formatting preferences or style guide
Scope boundaries

What is not included

To keep our offering transparent, the following are outside our standard services unless expressly stated in a written quotation:

Transcription & translation

We do not create transcripts or translate content. Source text must be supplied and approved by the client.

Video editing & burn-in

We deliver subtitle files only. We do not edit video or permanently render (burn) subtitles into media.

Content review

We do not verify the factual, legal or linguistic accuracy of client-supplied text beyond agreed formatting rules.

Have a subtitle project ready?

Send us your requirements and supplied files. We review every request and reply with a written, project-specific quotation.

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