Solution Use Case
Automate your closed captioning and subtitle workflows
Convert & conform closed captioning files
using our API, and CLI tools.
Trusted by global teams
How do I convert closed caption files between formats like SRT, SCC, and VTT automatically?
Closed Caption Converter is an API and CLI service that converts closed caption and subtitle files between more than 30 formats, including SRT, SCC, VTT, PAC, and TTML. A single request can also segment files and re-time captions, with pricing starting at $0.10 per job.
Designed for today's media companies to help deliver accessible video at scale
The largest broadcasters in the world choose Closed Caption Converter's API to help automate their closed caption workflows. Convert, segment, and re-time closed caption files all in a single request.
Closed Caption Converter is our suite of automation tools designed to help process closed captioning and subtitle files at scale.
Closed Caption Converter does not require a subscription to Closed Caption Creator and can be utilized as a standalone service.
- Convert between 30+ formats including SRT, SCC, VTT, PAC, and TTML.
- Offset timecodes and convert between framerates for playout and OTT delivery.
- Segment files to accommodate slates and commercial blacks.
- Automatically QC caption content and technical file metadata.
- Verify sync against a proxy video with automatic alignment checks.
- Pay per job — starting at $0.10 with no subscription required.
STEP 1
Upload
Submit a caption file through the API, CLI, or web UI playground — 30+ formats accepted.
STEP 2
Convert
Convert between formats, offset timecodes, change framerates, and segment for slates and commercial blacks — all in a single request.
STEP 3
Validate
Automatic content and technical QC, plus alignment checks against your proxy video, flag files that need attention.
STEP 4
Download
Collect conformed, QC-passed files ready for playout or OTT delivery — starting at $0.10 per job.
- 30+Formats supported, including SRT, SCC, VTT, PAC, and TTML
- $0.10Pay-per-job starting price — no subscription required
- 1 requestConvert, segment, and re-time captions at once
Convert & Conform
Deliver closed captioning in more than 30 different formats
Convert Files
Convert closed caption and subtitle files to more than 30 different supported formats. Custom presets and profiles are also available.
Correct Caption Drift
Automatically offset timecodes to match the video or manually set an offset of your choice. Stretch and shrink the timecode of closed caption events to match the video.
Segmentation & Conform
Segment closed caption files to match edits made to the video. Insert blank frames to ensure a minimum frame-gap between caption events for platforms such as Netflix and Amazon Prime.
Automatic QC & Alignment Checks
Automatically identify files with errors
Content QC
Custom style guides ensure closed caption files meet the standards set by you. Verify that captions have the correct reading rate, maximum line length, and more. Automatic Format and Timing options help ensure that the closed caption file content is within spec.
Technical QC
Check a caption file's technical metadata to ensure it conforms to your set standards. For example, ensure the timecode information is in the correct format or that the SOM is set correctly. QC options vary based on the file format.
Automatic Alignment Check
Provide both the caption file and proxy video to determine a sync value based on the timecodes in the file. Trigger a workflow based on the sync value being below a certain threshold.
3rd Party Integrations
Directly connects to your existing systems
Simple and Secure API
Our API is easy to understand and even easier to implement. All systems are configured for single tenancy, ensuring logging and file processing are isolated to a single customer.
Web UI Playground
Configure and test API jobs in our web UI. Each successful job generates a job configuration and API Collection that can be easily imported into Postman for further testing and code generation.
Dedicated Support
Speak to an expert who specializes in broadcast captioning and can help integrate our API. Receive real answers and examples that assist in your development process.
Web UI Playground
Test real jobs before you write a line of code
Configure and run conversion jobs in the browser, then hand the exact configuration to your developers.
The web UI playground lets you configure and test API jobs without code. Each successful job generates a job configuration and an API Collection that can be imported straight into Postman for further testing and code generation.
- Configure and test jobs in the browser — no code required
- Export job configurations and API Collections for Postman
- Single-tenant systems keep logging and file processing isolated to you
Integrate Closed Caption Converter with your existing SDVI Rally system
Closed Caption Converter is now available as a Rally Application Service. Set up supply chain presets using Closed Caption Converter, and start delivering accessible content even faster.
Learn More
Ready to get started?
Sign up for a free 7-day trial of Closed Caption Creator and receive access to our video tutorials and courses.
Create closed captioning, subtitles, transcripts, and audio descriptions all in one application. Closed Caption Creator is made for broadcast and captioning teams who are committed to delivering high-quality, accessible video. Sign up now, or contact us for a live demo.
Caption conversion API questions
Common questions about converting, conforming, and QC-checking caption files with the Closed Caption Converter API and CLI.
Closed Caption Converter supports conversion between more than 30 closed caption and subtitle file formats, including SRT, SCC, VTT, PAC, and TTML. Custom presets and conversion profiles are also available for teams with specific delivery requirements for playout or OTT platforms.
Yes. Timecodes can be offset automatically to match the video or set manually to a chosen value. The API can also stretch and shrink the timecode of caption events to match the video, and convert between framerates for playout and OTT delivery.
Yes. Content QC uses custom style guides to verify reading rate, maximum line length, and other format and timing requirements. Technical QC checks file metadata, such as whether timecode information is in the correct format or the SOM is set correctly. QC options vary based on the file format.
Yes. The automatic alignment check accepts both the caption file and a proxy video, then determines a sync value based on the timecodes in the file. Workflows can be triggered when the sync value falls below a set threshold, flagging files that need attention.
Pricing starts at $0.10 per job. Closed Caption Converter is a standalone service, so it does not require a subscription to Closed Caption Creator. A web UI playground is included for configuring and testing jobs before committing to an integration.
A web UI playground allows jobs to be configured and tested without code. Each successful job generates a job configuration and an API Collection that can be imported into Postman for further testing and code generation. All systems use single tenancy, so logging and file processing stay isolated to a single customer.