Online Caption Converter

Converts caption and subtitle data between formats to ensure platform compatibility and localization efficiency for editors, producers, and QA teams.

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About This Tool

This tool converts caption and subtitle data between formats to ensure cross‑platform compatibility and streamlined localization. It handles common formats such as SRT, WebVTT, TTML, SBV, and SCC, preserving text and line breaks while updating timing syntax as required. The conversion process is format‑aware, parsing each cue, normalizing timestamps, and reserializing content to the target format with proper delimiter conventions. It supports optional time offsets to align captions with new video timelines and preserves UTF‑8 encoding for all characters. The system is designed for editors, localization teams, and QA professionals who publish captions across platforms or locales. By validating cues and reporting issues, it reduces manual reformatting, speeds up review cycles, and helps maintain consistency across videos and languages. Unique value lies in robust format support, per‑cue integrity checks, and configurable timing adjustments, enabling reliable batch workflows and API integrations for content pipelines.

How to Use

  1. Provide inputs: select input_format, output_format, and paste or upload caption content.
  2. Configure options: set optional time_offset (in seconds) and encoding (default UTF-
  3. .
  4. Run conversion: trigger Convert to generate the target format content.
  5. Review results: inspect converted_content and diagnostics for any issues.
  6. Export or copy: copy the result or export as a file for delivery into publishing systems.
How to use online caption and subtitle converter

Frequently Asked Questions

Find Quick Answers

Which formats does the tool support?
The converter supports SRT, WebVTT, TTML, SBV, and SCC, with reliable timestamp translation and cue text preservation. Some platform-specific nuances may require minor adjustments after conversion, which are reported in diagnostics.
Can I shift timing during conversion?
Yes. A time_offset value can be applied to all cues during conversion, allowing alignment with a new master video timeline. Offsets are validated to stay within a safe range to prevent negative times.
Does it preserve punctuation and line breaks?
Text content and line breaks within cues are preserved during format conversion. Some format limits may affect multi-line cue lengths, which will be reported in diagnostics if detected.
Is translation or styling included?
No translation or styling is performed. The tool focuses on format conversion and timing integrity. Styling metadata for TTML/WebVTT is preserved where supported, but not rendered as styled video captions.

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