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Subtitles tool

Subtitle Case Converter

Uppercase, lowercase or title-case an entire caption file.

Runs on-deviceNo sign-upFree
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Subtitle Case Converter workspace

Workspace

Subtitle Case Converter

Runs locally

Supports SRT and WebVTT. Cue times are parsed to the millisecond and rebuilt without touching your video.

Captions

The guide

By the utils.sbs team · Reviewed November 2026 · How we build and review tools

Quick answer

Subtitle Case Converter is a free browser-based subtitles tool. Uppercase, lowercase or title-case an entire caption file. It runs with JavaScript text parsing locally, requires no account and does not upload your files. Open the page, add your input, adjust any options and download the result.

What is Subtitle Case Converter?

Subtitle Case Converter is a free browser-based subtitles tool from utils.sbs. Uppercase, lowercase or title-case an entire caption file. It is built for quick, focused jobs: open the page, add your input, adjust the options and take the result with you. No account, install or server upload is required.

At a glance

CategorySubtitles
InputSRT, VTT or plain subtitle text
OutputAn adjusted SRT, VTT or plain-text subtitle file
EngineJavaScript text parsing
ProcessingIn your browser
PriceFree
AccountNot required

How Subtitle Case Converter works

Subtitle files are parsed as text, adjusted with the selected timing or format options, and written back out as a downloadable file.

How to use Subtitle Case Converter

  1. 1Open Subtitle Case Converter and add your input.
  2. 2Adjust the options: case.
  3. 3Run the tool, check the preview or result, and download the output.

When to use Subtitle Case Converter

  • Convert subtitle files between SRT, VTT and plain text.
  • Shift or retime captions after editing a video.
  • Clean duplicate cues and line breaks before uploading captions.

Inputs and options

Case
Choose one of 3 options.

Limitations

Overlapping cues or unusual text encodings may require manual cleanup after conversion.

Privacy and accuracy

Subtitle Case Converter processes its input in the browser whenever the platform API allows it. Files and values are not uploaded to a server for processing, and the tool does not require an account. For calculations, use the result as a reference and verify important decisions against the source formula or a qualified professional. Read our methodology.

FAQ

Subtitle Case Converter questions

  • What can I do with Subtitle Case Converter?

    Uppercase, lowercase or title-case an entire caption file. Subtitle Case Converter is part of the Subtitles shelf on utils.sbs and is designed for quick, one-off tasks.

  • Is Subtitle Case Converter free to use?

    Yes. Subtitle Case Converter is free, requires no account, and has no per-file or per-use charge.

  • Are my files uploaded when I use Subtitle Case Converter?

    No. Subtitle Case Converter is designed to process your input locally in the browser. Files are not uploaded to a server for processing.

  • What formats does Subtitle Case Converter support?

    It reads common subtitle formats such as SRT and VTT and writes the converted or adjusted file back out.

  • Can I use Subtitle Case Converter on my phone?

    Yes. Subtitle Case Converter is responsive and works in modern mobile browsers. Very large files may be limited by the device's available memory.

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