Is the VTT to SCC converter free?

Yes, completely free with no sign-up, no watermarks, and no file size limits. All processing happens locally in your browser, ensuring complete privacy.

Can I convert VTT to SCC for FCC compliance?

Yes. The FCC requires closed captions on most US broadcast and online video content. Converting VTT subtitles to SCC format produces broadcast-ready CEA-608 captions that meet FCC closed captioning delivery requirements for television.

How does SCC handle the limited CEA-608 character set?

CEA-608 supports a limited character set optimized for English, with basic support for Spanish and French accented characters. Characters outside the CEA-608 set (like certain Unicode symbols or Asian scripts) cannot be represented in SCC and may be approximated or dropped.

What frame rate should I use for VTT to SCC?

North American broadcast uses 29.97fps NTSC with drop-frame timecode. The converter defaults to 29.97fps drop-frame, which is required by US broadcast networks. Do not change this unless you have a specific non-standard frame rate requirement.

Are VTT NOTE comments preserved in SCC?

No. VTT NOTE blocks are developer comments with no equivalent in CEA-608 encoding. They are stripped during conversion. Only caption text and timing are encoded in the SCC output.

Can SCC files be edited after conversion?

SCC files are plain text containing hexadecimal byte pairs (like 9152 91ae) that represent CEA-608 commands. While technically editable in a text editor, you need specialized caption tools like Mac Caption, CaptionMaker, or InqScribe to edit them meaningfully.

How does VTT-to-SCC differ from SRT-to-SCC?

VTT has more features than SRT (cue settings, voice tags, NOTE comments, WEBVTT header) that need to be handled during conversion. Both produce the same SCC output format, but the VTT path strips more web-specific syntax that SRT does not have.

What are SCC caption channels and which one is used?

CEA-608 defines four channels: CC1 (primary English), CC2 (secondary, often Spanish), CC3 (alternate), CC4 (alternate secondary). The converter defaults to CC1. For Spanish-language captions converted from VTT, you may want to target CC3.

Absolutely. All conversion happens client-side in your browser. No subtitle data, file contents, or metadata is ever transmitted to a server.

Does the converter support italic text from VTT?

Yes. VTT inline italic tags ( ) are converted to CEA-608 italic control codes in the SCC output. The SCC format supports a single italic attribute per caption block through the 0x91 0x91 control sequence.

Can I batch convert multiple VTT files to SCC?

This page processes one file at a time. For batch processing, use the Workspace pipeline to load multiple VTT files and convert them sequentially.

What file extension does SCC use?

SCC files use the .scc extension, recognized by US broadcast systems, NLE systems (Avid Media Composer, Adobe Premiere Pro), and caption authoring software.

Can I use SCC for streaming platforms?

SCC is primarily for broadcast television. Streaming platforms like Netflix, Hulu, and Amazon typically require IMSC (TTML) or WebVTT rather than SCC. Check your streaming platform's subtitle delivery specifications before delivering SCC files.

VTT to SCC Converter

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VTT

WEBVTT
 
00:00:01.000 --> 00:00:04.000
Hello, world!
 
00:00:04.500 --> 00:00:08.000
This is a subtitle file.
 
00:00:08.500 --> 00:00:12.000
Converted locally!

SCC

Scenarist_SCC V1.0
 
00:01:00	9420c8e5ececef2c20f7eff2ec64a180942f
00:04:00	942c
00:04:15	94205468e97320e973206120737562f4e9f4ece520e6e9ece5ae942f
00:08:00	942c
00:08:15	942043ef6e76e5f2f4e56420ecefe361ecec79a1942f
00:12:00	942c

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How It Works

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Free Online VTT to SCC Converter

Our VTT to SCC converter takes web-native WebVTT subtitles and encodes them into Scenarist Closed Captioning format for North American broadcast television and streaming service delivery. The converter strips the WEBVTT header, reads each VTT cue, encodes the text into CEA-608 hexadecimal byte pairs, converts VTT timestamps (HH:MM:SS.mmm) to SMPTE timecodes (HH:MM:SS:FF at 29.97fps), and outputs a valid .scc file with the Scenarist_SCC V1.0 header. This bridges web-created captions into professional broadcast workflows.

Input Format

VTT

VTT (WebVTT) is the W3C standard subtitle format for web video. A VTT file starts with the literal header WEBVTT on the first line, followed by cue blocks using HH:MM:SS.mmm --> HH:MM:SS.mmm timestamps (period before milliseconds). VTT supports optional cue settings (positioning, alignment, sizing), inline styling tags, NOTE comments, and CSS blocks. It is the native subtitle format for HTML5 video, YouTube, Vimeo, and JavaScript video players.

Output Format

SCC

SCC (Scenarist Closed Captioning) is the industry-standard format for delivering closed captions to North American broadcast television and major streaming services. SCC files encode CEA-608 (Line 21) caption data as hexadecimal byte pairs, paired with SMPTE timecodes in HH:MM:SS:FF format (hours:minutes:seconds:frames at 29.97 fps). The file starts with a header line (Scenarist_SCC V1.0) followed by timecode-tab-data triplets. Because caption text is hex-encoded, SCC files are not human-readable without a decoder.

Features

Encodes VTT cue text into CEA-608 hexadecimal byte pairs

Converts VTT timestamps to SMPTE timecodes at 29.97fps

Strips VTT header, NOTE comments, and cue settings before encoding

Inserts pop-on caption control codes for proper display timing

Adds the Scenarist_SCC V1.0 header required by broadcast systems

Maps VTT inline styling tags to CEA-608 mid-row attributes where possible

Why Convert?

Closed captions produced for streaming platforms must be converted to SCC for over-the-air and cable broadcast delivery.

CEA-608 caption data embedded in SCC is the legally required format for FCC-compliant US television, whereas VTT is web-only.

SCC files drive professional caption encoders and broadcast servers that cannot parse VTT cue blocks.

Post-production caption insertion hardware expects SMPTE-timed SCC data, not web-sourced VTT.

Netflix and Amazon deliverable specs list SCC as a required caption format alongside TTML, never VTT.

SCC preserves 29.97fps drop-frame timing that matches NTSC broadcast, which VTT's free-running millisecond clock cannot guarantee.

Converting VTT to SCC bridges web captioning tools and traditional broadcast caption workflows.

Format Differences

VTT stores text as readable UTF-8; SCC encodes text as hexadecimal byte pairs.

VTT uses HH:MM:SS.mmm timestamps; SCC uses HH:MM:SS:FF SMPTE timecodes at 29.97fps.

VTT starts with WEBVTT header; SCC starts with Scenarist_SCC V1.0 header.

VTT supports CSS styling and inline tags; SCC uses CEA-608 mid-row attribute codes.

VTT supports NOTE comments and metadata; SCC has no comment or metadata mechanism.

VTT supports cue positioning (line, position, align); SCC positioning is fixed to the caption area.

Common Use Cases

Web-to-Broadcast Pipeline

Convert captions created for web video into SCC format for television broadcast delivery, bridging web production and broadcast workflows.

Streaming Platform Delivery

Generate SCC files from VTT subtitles to meet Netflix, Amazon Prime, or Hulu caption delivery specifications.

Caption Repurposing

Reuse web video captions for television programming by converting VTT to the broadcast-standard SCC format.

Broadcast Compliance

Ensure captions meet FCC requirements by delivering CEA-608 compliant SCC files encoded from web subtitle sources.

Multi-Platform Distribution

Produce both VTT (for web) and SCC (for broadcast) from the same subtitle source for multi-platform content delivery.

Professional Captioning

Feed web-created subtitle content into professional captioning workflows that require SCC as the input format.

Related Formats

VTT (WebVTT)

The input format: web video subtitle standard for HTML5 video, YouTube, and JavaScript players.

SRT (SubRip)

The universal alternative: if you also need a player-compatible format, keep the VTT or convert to SRT alongside SCC.

TTML (Timed Text Markup Language)

The XML-based alternative: some streaming platforms prefer TTML/IMSC for caption delivery instead of SCC.

Frequently Asked Questions

Why convert VTT to SCC for broadcast?

SCC (Scenarist Closed Captions) is the standard delivery format for North American broadcast closed captions (CEA-608). If your subtitles are authored as WebVTT for web distribution, converting to SCC is necessary before delivering to US broadcast networks like NBC, CBS, or Fox.

What happens to VTT cue positioning in SCC?

VTT cue settings like position, align, and line are simplified to SCC's limited positioning model. SCC uses CEA-608 row indent and caption mode (pop-on, roll-up) for positioning. Advanced VTT positioning may be approximated to the nearest SCC-compatible layout.

Does the converter handle VTT voice tags?

VTT voice tags (<v Speaker>) label dialogue by speaker. SCC has no native speaker identification system, so speaker labels are either stripped or optionally prefixed as plain text before the caption content, depending on your caption style requirements.

How does the converter strip VTT web-specific syntax?

The converter removes the WEBVTT header, NOTE comment blocks, cue identifiers, and inline cue settings (align, position, line). These web-specific features have no equivalent in SCC's CEA-608 encoding and are discarded during conversion.

How are VTT timestamps converted to SCC timecodes?

VTT timestamps (00:01:30.500) are converted to SCC timecodes in HH:MM:SS;FF format with semicolons for NTSC drop-frame. At 29.97fps, 500ms maps to approximately frame 15. The converter generates valid SMPTE drop-frame timecodes.

What caption mode does the converter use by default?

The converter defaults to Pop-On mode, which displays complete caption blocks (closest to how VTT cues appear). You can also select Roll-Up mode for scrolling captions or Paint-On for character-by-character display, depending on your broadcast requirements.

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Related Resources

What is VTT?What is SCC?