Free Case Converter
Change text case to UPPERCASE, lowercase, Title Case, or Sentence case online for free.
Drag & drop your files here, or browse
Supports plain text files: .txt, .md, .csv, .json, .html
Converted Result
Your converted output will appear here.
About the Free Case Converter Tool
This tool allows you to change the casing of your text or documents with ease. This tool is completely private, and your files and data never leave your device. It is 100% free to use, requires no signup or login, and offers unlimited use.
How to Use the Case Converter in 4 Easy Steps
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Type or paste your text under "Type Text", or switch to "Upload File" to select text documents.
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Choose your desired casing style (such as UPPERCASE, lowercase, Title Case, or Sentence case).
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Preview your converted text or document changes in real time.
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Click Copy Output to copy formatted text to your clipboard, or download your processed files with a single click.
Features & How It Works
How the Case Converter Works
This tool is completely private, and your text and files never leave your device. When you paste text or select files, your content is formatted instantly on your computer or phone without ever being sent across the internet.
Simple & Fast Operation
- Convert typed text: Keep the "Type Text" tab active, paste your text, click any case conversion button, and copy your output directly.
- Convert text documents: Select the "Upload File" tab, drop files, choose the target case format, click convert, and download each file.
Supported Case Types
Our formatting engine supports standard configurations:
- UPPERCASE: Capitalizes every alphabetical letter.
- lowercase: Sets all letters to small case.
- Title Case: Capitalizes the first letter of each word.
- Sentence Case: Capitalizes initial sentence words.
Instant File Downloads
Save your converted documents individually or in batches with a single tap. Download your converted files directly to your device with original layout and structure preserved.
Total Privacy & Data Protection
Your sensitive files and text remain strictly confidential. This tool is completely private, and your files and data never leave your device, ensuring maximum security for personal or business documents.
Everyday & Professional Use
Perfect for content editors correcting accidental Caps Lock entries, web designers standardizing headings, students formatting essays, and copywriters formatting article titles to professional Title Case.
Frequently Asked Questions
Is my uploaded document secure?
Yes, absolutely. This tool is completely private, and your files and data never leave your device. Your documents are never uploaded to remote servers or stored in any database.
What file formats are supported?
We support text-based file formats including .txt, .md, .csv, .json, .xml, .html, .css, and .js. Complex binary layouts (like PDFs or Word .docx) are not supported in this plain text converter and will display a binary warning.
Why does it throw an error for certain documents?
Our tool checks files for binary code characters. If you select an image, zip file, or compiled binary document, the app blocks processing to prevent displaying corrupted characters, showing a friendly warning banner instead.
Is there a limit on the number or size of files I can select?
No, there are no artificial limits on the number of files or total size you can upload. However, because processing is handled directly on your device, selecting extremely large documents (e.g., over 50MB) or hundreds of files at once may temporarily take a few extra moments.
Can I copy the formatted text output instantly?
Yes, in the "Type Text" tab, once your text is converted, a "Copy to Clipboard" button will appear. Clicking it copies the formatted text instantly, and a temporary badge confirms the action.
What naming convention does it use for converted files?
To keep your files organized, the converter automatically appends a suffix representing the target case type to your original filename. For example, converting document.txt to UPPERCASE yields a downloadable file named document_UPPER.txt.
Are there character limits for pasted text?
There is no hardcoded limitation on the size of the text you can paste into the box. However, pasting text blocks containing millions of characters may exceed browser memory limitations or slow down the responsiveness of the input text area. For massive texts, we recommend saving them as a .txt or .md file and using our file upload conversion instead.