MMegaConvert

Convert SRT to SUB

Free online SRT to SUB converter. No signup required.

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Max file size: 100 MB

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How to Convert SRT to SUB

Follow these simple steps to convert your file in seconds.

  1. 1

    Upload your .srt file

    Drag and drop your .srt file into the upload area, or click "Browse" to select it from your device. Your file is uploaded securely and processed on our servers.

  2. 2

    Click "Convert to SUB"

    Once your file is uploaded, press the convert button to start the SRT to SUB conversion process.

  3. 3

    Wait for the conversion to complete

    The conversion usually takes just a few seconds. You can see the progress in real time while your file is being processed.

  4. 4

    Download your converted .sub file

    When the conversion is finished, click the download button to save your new .sub file. The file is ready to use immediately.

Understanding SRT and SUB Formats

Learn about the source and target file formats to understand what happens during conversion.

Source Format

SubRip Subtitle

application/x-subrip

SRT (SubRip Subtitle) is the most widely used text-based subtitle format, storing numbered subtitle entries with timestamps and plain text content. Each entry contains a sequence number, start and end timestamps in HH:MM:SS,mmm format, and one or more lines of text. SRT is supported by virtually every media player and video platform due to its simplicity and ubiquity.

Advantages

  • Universally supported by virtually all media players and video platforms
  • Extremely simple plain-text format that is easy to create and edit manually
  • Supported for upload on YouTube, Vimeo, and most streaming platforms

Limitations

  • No support for text styling, positioning, or color formatting
  • No support for karaoke-style word-by-word timing
  • Cannot specify screen position or region for subtitle display

Common Uses

  • Movie and TV show subtitle files for media players
  • YouTube and streaming platform subtitle uploads
  • Fan-created subtitles and translation projects

Target Format

MicroDVD Subtitle

text/x-sub

SUB (MicroDVD Subtitle) is a frame-based subtitle format that uses frame numbers rather than timestamps for timing synchronization. Each line contains start and end frame numbers enclosed in curly braces followed by the subtitle text, with pipe characters separating multiple display lines. SUB requires knowing the video frame rate to correctly synchronize subtitle display timing.

Advantages

  • Frame-accurate timing that precisely matches video frame boundaries
  • Simple format that is easy to parse and generate programmatically
  • Supported by many popular media players including VLC

Limitations

  • Frame-based timing requires knowledge of video frame rate for correct display
  • Changing the video frame rate misaligns all subtitle timing
  • Less intuitive than timestamp-based formats for manual editing

Common Uses

  • Legacy subtitle files for video content
  • Frame-accurate subtitle synchronization for specific video encodes
  • Subtitle conversion source for timestamp-based format output

Frequently Asked Questions

Common questions about converting SRT to SUB.

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