Convert closed caption & subtitle files for broadcast
Support for all industry-standard closed caption file formats including SCC, TTML, SRT, STL, WebVTT, and more.
Trusted by broadcasters and streaming platforms worldwide
Automate your closed caption workflows
Closed Caption Converter is a suite of software tools to help convert and edit closed caption files.
Function Modules can be used to automate repetitive editing tasks such as timecode rippling, segmentation, frame rate conversion, and more.
See how it works
The ability to bulk convert and sync caption formats has saved us countless hours each week. Whether we’re preparing files for web, or broadcast television, Closed Caption Converter handles all the technical requirements seamlessly.
Blaise Buxton
Director of Engineering, YES TV
Everything you need to ship compliant captions
Eliminate manual caption work with automated conversion, custom QC validation, alignment, and simple API integration for any workflow.
Convert
Transform caption files seamlessly between 30+ different formats, including broadcast standards like SCC, MCC, EBU-STL, and streaming formats.
Conform
Ripple timecodes, convert frame rates, segment files, fix overlaps, and insert frame gaps to ensure perfect caption timing and formatting.
Automatic QC
Configure custom style guides to automatically detect reading rate errors, character limits, line counts, and content issues before broadcast.
Metadata
Read and modify file metadata including frame rates, author details, and technical specifications to match your workflow requirements precisely.
API & CLI
Automate caption workflows with our command-line interface for on-premise deployments and REST API for seamless cloud-based integrations.
Alignment & Sync
Automatically synchronize caption timing with video content through our API, ensuring perfect alignment for professional broadcast and streaming delivery.
Seamless workflow integration
Connect your entire caption workflow with built-in integrations for media asset management, cloud storage, AI services, and edit tools.
Our API connectors eliminate manual file transfers and streamline your entire caption pipeline, from transcription through to delivery.
One engine, three ways to use it
Start with our simple web application for fast conversions, scale with our cloud API for automated processing and third-party integrations, or deploy our CLI for on-premise and offline processing.
Web Application
Need to convert a few caption files quickly? Our web application runs entirely in your browser with no downloads or uploads required. Your files stay secure on your device while processing happens locally—just select, convert, and download.
API
The most advanced closed caption API available, with features beyond conversion. Add transcription, machine translation, forced alignment/sync, and direct delivery to cloud storage and managed platforms such as Iconik.
CLI
Built for secure, on-premise environments where internet access is restricted. Available for Mac, Windows, and Linux. This single file executable is easy to deploy and manage using custom presets.
Yes, Closed Caption Converter works on all major operating systems. Our web application runs in any modern browser, so it works on Mac, Windows, Linux, and even mobile devices. The CLI version is available as native binaries for Mac, Windows, and Linux. Our cloud API can be accessed from any platform that supports HTTP requests, making it completely platform-agnostic.
To access the Closed Caption Converter API, you need an active subscription to Closed Caption Converter. You can sign up for our monthly plan ($10.00/month + $0.10 per job) or contact us for enterprise pricing. Once you have an active subscription, you'll receive your API credentials and access to our developer resources. Complete API documentation is available here.
Absolutely. With our web application, your files never leave your device—all processing happens locally in your browser, so there's no uploading to external servers. For maximum security, our CLI runs entirely on-premise in offline environments. Our cloud API uses enterprise-grade encryption and secure file handling, with files automatically deleted after processing. Choose the deployment option that best meets your security requirements.
Closed Caption Converter supports over 30 different closed caption and subtitle formats, including broadcast standards like SCC, MCC, and EBU-STL, as well as streaming formats like WebVTT, SRT, and TTML. We also support specialty formats for major platforms including Netflix, iTunes, and DVD authoring tools. For a complete list of supported input and output formats, please visit our supported formats page.
To download the CLI, please contact our support team at support@closedcaptionconverter.com. Each CLI build contains a unique license tied to your account, so we provide personalized download links to ensure proper licensing and security. Our team will send you the appropriate version for your operating system (Mac, Windows, or Linux) along with installation instructions.
Contact our support team at support@closedcaptionconverter.com and we'll help troubleshoot the issue. To expedite resolution, please include the original file you're trying to convert, your target output format, and any error messages you received. We provide 24/7 technical support to ensure your critical workflows stay running smoothly.
Team accounts are not currently supported. Each subscription is designed for individual use with unique licensing. If you have multiple team members who need access to Closed Caption Converter, each person will need their own subscription. For organizations with larger team requirements, please contact our support team at support@closedcaptionconverter.com to discuss potential enterprise solutions.
You can manage your subscription by visiting our customer portal here, where you can upgrade, downgrade, or cancel your plan at any time with no commitment. If you need assistance or have questions about your subscription, you can also contact our support team at support@closedcaptionconverter.com and we'll be happy to help.
Ready to get started?
Sign up for a free 7-day trial of Closed Caption Converter and get 1:1 developer support and access to our video tutorials.
Start automating your closed caption workflows. Convert, conform, and deliver closed caption files in over 30 different formats.