Captions Format Converter

Free tool that converts SRT or SBV to various captions formats

The captions format converter lets you convert from SRT (SubRip subtitle) or from SBV (YouTube) to Flash DFXP, SMI or SAMI (Windows Media), SCC, CPT.XML (Flash Captionate XML), QT (Quicktime), and STL (Spruce Subtitle File).

Did you know you can use our caption encoding service to create a self-contained video with encoded closed captions that works with an iPhone and most other devices? You can also export a video with open captions burned in.


Paste your SRT or SBV file and select which closed caption output format you need. Your captions file will be emailed to you as an attachment that preserves the integrity of the formatting.

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Captions Formats Explained

SRT – This is the most common subtitle/caption file format. It is a text format that originated in the DVD-ripping software SubRip and stands for “SubRip Subtitle” file.

SBV – This is a YouTube caption file format that stands for “SubViewer.” It’s what you get when you download captions from YouTube. It’s a text format that is very similar to SRT.

DFXP – This is a common format used for captioning Flash video. It’s a timed-text format that was developed by W3C and stands for “Distribution Format Exchange Profile”.

SCC –Popular standard used for encoding closed captions for web media, DVD, and iTunes, iPods, iPads, and iPhones. It was originally developed by Sonic and stands for “Scenarist Closed Caption.”

SMI or SAMI – Used for Windows Media video or audio. It was developed by Microsoft and stands for “Synchronized Accessible Media Interchange.”

CPT.XML – XML format used for encoding captions into Flash video. It originated in the caption-embedding software Captionate.

QT – Caption format used for QuickTime video or audio. It was developed by Apple.

RT – RealText captions for RealMedia video or audio.

STL – Used for DVD Studio Pro. It was developed by Spruce Technologies and known as “Spruce Subtitle File.”