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Subtitle Conversion Video Editing SRT VTT ASS

Ultimate Subtitle Format Conversion Guide: Supporting 50+ Formats (SRT, VTT, ASS, TTML, etc.)

Struggling with incompatible video subtitle formats? This guide covers 50+ subtitle formats and provides a powerful online tool for converting between them instantly.

T3 Tool3M Editorial Team Reviewed technical guide 3 min read Reviewed by Tool3M Maintainers Use This Tool

In the world of video production, film translation, and online streaming, the diversity of subtitle formats can be a real headache. Different players, editing software, and platforms have varying requirements. To solve this, we've developed a comprehensive Online Subtitle Format Converter.

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Try our professional subtitle converter tool now. Fast, free, and supports over 50 formats.

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Supported Subtitle Formats

Our tool supports an extensive list of formats, categorized by their primary use cases:

1. Universal Text Formats (Most Common)

  • SRT (SubRip): The global standard for video subtitles.
  • VTT (WebVTT): The HTML5 web standard for browsers.
  • ASS/SSA (Advanced Substation Alpha): Rich styling and precise positioning.
  • SUB (MicroDVD): Frame-based subtitles common in legacy media.
  • TXT: Simple plain text subtitle extraction.
  • SAMI (.smi): Microsoft's synchronized media format.
  • RT (RealText): RealPlayer legacy format.
  • SBV: YouTube's native timing format.
  • TTML/DFXP: Professional XML standards (Netflix/Amazon).
  • STL (Spruce): Industry-standard for DVD/Blu-ray authoring.
  • XML/JSON: Developer-friendly generic formats.

2. Streaming & Web Platforms

  • IMSC1: W3C standard for internet media subtitles.
  • SMPTE-TT: Broadcast-grade timed text standard.
  • YouTube XML: Native YouTube caption format.
  • Netflix/Amazon Timed Text: Specialized XML variants.

3. Professional Editing & Production

  • AQT (AQTitle): High-quality professional captions.
  • JSS (JACOsub): Feature-rich script format.
  • MPL/MPSUB: MPlayer-compatible formats.
  • QTtext: QuickTime native text track.
  • USF: Universal Subtitle Format.
  • SON (Spruce Script): Professional script-based subtitles.
  • EBU-TT: European Broadcasting Union timed text.
  • FCPXML: Final Cut Pro XML subtitle exchange.

4. Lyrics & Karaoke

  • LRC: Synchronized lyrics for music players.
  • KRC/QRC: Kugou and QQ Music specialized formats.
  • KSC/TRC: Karaoke-grade timing and transition formats.

5. Specialized & Rare Formats

  • SubViewer (.sub): Alternative text-based format.
  • RTF/CSV/YAML: Document-based and data-driven subtitles.
  • SBT, ZEG, OVR, CIN, PJS, PSB, TMP, S2K, DKS, ASC: Various legacy and niche player formats.

Important Note on Binary & Container Formats

While our tool handles nearly all text-based subtitle files, some formats are binary (image-based) or media containers:

  • Binary Formats: PGS (Blu-ray), SUP, SCC, EBU STL (Binary), CAP, PAC, VobSub. These require OCR (Optical Character Recognition) to extract text.
  • Containers: MKV, MP4, MOV, MXF. These are video files that contain subtitle tracks. You must first "demux" or extract the subtitle file from the container before converting.

Why Use Our Subtitle Converter?

  1. Platform Compatibility: Easily jump between YouTube's .srt, Netflix's .ttml, and WebVTT for your own site.
  2. Style Control: Convert simple SRTs into powerful ASS files to add colors and better positioning.
  3. No Installation: Everything runs in your browser—no software to download, and your files never leave your computer.
  4. Local Processing: We process everything locally for maximum privacy and speed.

How to Get Started

  1. Upload or Paste: Click "Upload File" or paste your subtitle content into the editor.
  2. Select Format: Choose your target format from the extensive dropdown menu.
  3. Preview & Export: Your converted subtitles appear instantly. Copy to clipboard or download the file with one click.

Experience the most versatile subtitle tool online. Open Subtitle Converter now!

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