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Subtitle SRT Draft Builder

Build fixed-duration subtitle cues from one caption per line.

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Three steps. That’s it.

A useful toolkit for text, data, images and calculations.

  1. 01

    Add your input

    Choose a tool, enter values or select a file.

  2. 02

    Make it yours

    Adjust the options and run the action.

  3. 03

    Take the result

    Copy the result or download its file.

Subtitle SRT Draft Generator online

Build fixed-duration subtitle cues from one caption per line. Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

How to use it

Paste the multi-line input in the format shown below. Set seconds per caption, starting seconds. Choose Run tool. Review the output, then copy or download it.

Options and example settings

OptionChoices / valueExample default
Seconds per captionEnter seconds per caption.3
Starting secondsEnter starting seconds.0

Worked examples

Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

Reproducible worked example

Settings: Seconds per caption: 3; Starting seconds: 0

Input:

First caption
Second caption

With the input and settings above, the tool produces:

Output:

1
00:00:00,000 --> 00:00:03,000
First caption

2
00:00:03,000 --> 00:00:06,000
Second caption

The example output has 7 lines. Compare its order, separators and whitespace with the input before copying the result.

Limitations and common mistakes

  • Creates evenly timed draft cues; synchronization and reading speed require manual review.
  • Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste the multi-line input in the format shown below. The worked example shows the supported structure and actual output.

How can I create fixed-duration subtitle cues from one caption per line online?

Paste the multi-line input in the format shown below. Set seconds per caption, starting seconds. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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