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ToolsFire

Free Online Case Converter

Convert text to sentence case, lowercase, uppercase, title case and seven developer-friendly formats. Everything runs in your browser.

Change capitalization and text formats in a few clicks. Paste or type text, choose a case style, then copy or download the result. Your text is processed locally in your browser.

Transform text into the format you need. Your text is processed in this browser and is not sent to ToolsFire.

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Up to 250,000 UTF-16 code units. Text stays on this device.

Letter casing follows Unicode-aware browser rules. Title Case uses common English small-word conventions; linguistic capitalization differs between languages. Alternating case starts with a lowercase letter and changes only on letters, so punctuation, spaces, digits and emoji do not change its rhythm.

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How to use the Case Converter

  1. Paste or type text in the Your text box.
  2. Choose one of the case buttons to create a result from your original input.
  3. Copy the result or download it as a UTF-8 text file. Choose another mode at any time; conversions do not build on the previous result.

Case conversion modes

Examples

For the input “ToolsFire makes text tasks simple.”, uppercase produces “TOOLSFIRE MAKES TEXT TASKS SIMPLE.”; snake_case produces “toolsfire_makes_text_tasks_simple”; and kebab-case produces “toolsfire-makes-text-tasks-simple”.

Useful details and limitations

Counts use Unicode-aware browser segmentation where available. Character counts represent Unicode code points; byte count represents UTF-8 bytes. Case mapping can expand or vary by language, and English Title Case rules are not a universal grammar. Identifier formats remove punctuation and normalize word separators, so review the result before using it in code or URLs. Very long text is limited to 250,000 UTF-16 code units by the editor.

The converter does not upload or store the text and makes no external API requests. Clipboard access depends on browser permissions and a secure connection; if copying is blocked, select the result and copy it manually.

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Browse the ToolsFire tool collection to find other handy browser-based utilities.

Frequently asked questions

Is my text uploaded when I use this Case Converter?
No. Conversion runs in your browser. The tool does not send your text to an external API or store it on the server.
Can I switch between case formats without losing my original text?
Yes. Each mode converts from the text in the input box, not from the previous result. Edit the input whenever you want a new source.
What does Title Case do?
Title Case capitalizes the first and last words and most other words. Common short English words such as “and,” “of” and “the” stay lowercase in the middle of a title.
How does alternating case work?
It begins with a lowercase letter and alternates the case of letters only. Spaces, punctuation, digits and emoji are preserved and do not change the alternation.
How are camelCase and snake_case made?
The converter identifies words, splits common lower-to-upper and acronym boundaries, removes separators, and joins the words in the selected format. Review output for project-specific naming rules.
Does the converter support multiple languages and emoji?
It uses Unicode-aware browser features when available. Emoji and punctuation are preserved in ordinary case modes. Capitalization rules can differ across languages, and identifier modes intentionally remove punctuation.
Can I copy or save the converted text?
Use Copy result to copy the output, or Download .txt to save a UTF-8 text file. Clipboard permission depends on your browser and connection.
What are the text limits?
The input is limited to 250,000 UTF-16 code units to keep the page responsive. Counts are calculated locally, including UTF-8 byte length.