Subtitle Formatting & Technical Validation

Precision in Every Frame. Clarity in Every Word.

Professional subtitle formatting, synchronization and technical validation services for businesses, educational institutions and digital media teams.

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.SRT & .VTT deliverables Project-based quotations Confidential file handling
Who we are

A specialized partner for technical subtitle work

FLENTHURIAL LLC is a US-registered company providing business-to-business subtitle formatting, caption file structuring, timestamp synchronization and technical validation.

We work with the files and transcripts our clients supply and turn them into clean, consistent and technically correct subtitle deliverables. Each engagement is scoped, quoted and approved in writing before work begins, so you always know exactly what will be delivered.

About the company
B2B servicesFor organizations, institutions and media teams
Project-basedWritten quotation for every engagement
Two core formatsSubRip (.srt) and WebVTT (.vtt)
Electronic deliveryFiles delivered digitally on completion
Core services

Technical subtitle services, clearly scoped

Six focused services that can be ordered individually or combined into a single project.

Subtitle File Formatting

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

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SRT File Conversion

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

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WebVTT File Conversion

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

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Timestamp Synchronization

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

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Subtitle Structure Validation

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

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Transcript-to-Subtitle Processing

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

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Supported formats

Built for SRT and WebVTT

The two most widely used subtitle formats for video platforms, media players and web video.

SubRip

.SRT
1
00:00:01,200 --> 00:00:04,080
Welcome to the fourth session
of our data analysis course.
  • Comma millisecond separator
  • Sequential numeric cue counter
  • Broad compatibility with players, editors and platforms

Web Video Text Tracks

.VTT
WEBVTT

00:00:01.200 --> 00:00:04.080 line:85%
Welcome to the fourth session
of our data analysis course.
  • Required WEBVTT header and period separator
  • Optional cue settings for position and alignment
  • Native support in the HTML5 <track> element
Service workflow

A transparent six-step process

From first inquiry to final delivery, every stage is documented and nothing proceeds without your approval.

  1. Submit requirements

    Share your project details, file counts and required output through the quote form.

  2. Technical review

    We review supplied transcripts, files and technical specifications.

  3. Custom quotation

    You receive a written quotation with scope, price and delivery date.

  4. Approval

    You approve the scope and pricing before any work begins.

  5. Formatting & validation

    Files are processed and checked against the agreed specification.

  6. Electronic delivery

    Final files are delivered electronically, ready to publish.

See the full workflow

Quality assurance

Measured against your specification

Quality is defined up front. Your quotation states the format, formatting rules and timing requirements, and every file is checked against them before delivery.

  • Specification-first: every project is checked against the rules written into its quotation.
  • Syntax validation: timestamps, cue numbering, headers and separators are verified in every file.
  • Timing checks: overlaps, minimum gaps and cue durations are tested systematically.
  • Readability rules: line length, line count and reading speed are measured, not estimated.
  • Encoding checks: files are delivered in UTF-8 so special characters display correctly.
  • Final review: a closing review is performed before files are released for delivery.
Industries served

For teams that publish video

Education & e-learning

Lecture recordings, course videos and LMS-ready caption tracks.

Corporate communications

Training videos, internal announcements and marketing content.

Digital media & production

Post-production teams preparing subtitle deliverables.

Podcasts & webinars

Recorded sessions published with accessible captions.

Online publishers

Websites and platforms using HTML5 video players.

Agencies & studios

Creative and content agencies needing reliable file preparation.

FAQ

Frequently asked questions

Which file formats do you work with?

Our standard deliverables are SubRip (.srt) and WebVTT (.vtt) files. We can accept other timed-text or plain-text source material for conversion; please describe your source files in the quote request so we can confirm feasibility before quoting.

Do you transcribe or translate content?

No. FLENTHURIAL LLC focuses on technical formatting, conversion, synchronization and validation. Transcript-to-subtitle processing uses transcripts that you supply and have approved. Text content is not rewritten except for agreed formatting adjustments.

How is pricing determined?

Every project is quoted individually based on the number and length of files, the services required, the condition of the supplied files and the requested turnaround. You receive a written quotation and no work starts until you approve the scope and price.

How long does a project take?

Turnaround depends on volume and complexity. The estimated delivery date is stated in your quotation and confirmed when you approve the project.

How do I send my files?

After you submit a quote request we reply by email with instructions for transferring files. Small files may be sent as attachments; larger media is typically shared through a secure cloud-storage link that you control.

What happens if a delivered file has an error?

If a delivered file does not meet the specifications agreed in your quotation, report it within 14 days of delivery and we will correct it at no additional charge. See our Refund and Cancellation Policy for details.

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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