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File Name Case Converter Fast & Private
Convert file names to lowercase, UPPERCASE, Title Case, camelCase or kebab-case. 100% client-side — your files never leave your device.
Start Converting →File Name Case Converter Tool
Upload files, pick a case style, preview the renamed files and download them as a ZIP
Click or drag files here
Supports any file type (max 100MB per file)
About the File Name Case Converter
Our File Name Case Converter is a professional-grade utility that lets you convert the names of multiple files into a consistent case format instantly. Whether you need all lowercase for web assets, UPPERCASE for documentation standards, camelCase for JavaScript projects, or kebab-case for URLs — this tool handles it in a single click.
Unlike other online tools that require uploading to a server, our converter processes everything inside your browser. Your files are never transmitted anywhere, ensuring total privacy and blazing-fast performance regardless of your internet connection.
Supported Case Conversions
The tool supports five popular naming conventions used across different industries and platforms. lowercase replaces spaces and special characters with underscores and forces all letters to lower case. UPPERCASE does the same in all capitals. Title Case capitalises the first letter of every word. camelCase joins words together with the first word lowercase and subsequent words capitalised — the standard in JavaScript and many programming languages. kebab-case separates words with hyphens and is widely used for file names destined for the web.
Why Consistent File Naming Matters
Consistent file naming improves searchability, reduces errors in automated workflows, and makes collaboration easier. Teams that adopt a single naming convention spend significantly less time hunting for misplaced files. Developers, designers, content creators, and office professionals all benefit from standardised names.
100% Client-Side Processing
No File Upload Required
5 Case Styles Supported
Completely Free Forever
Last Updated: April 13, 2026 | Author: File Rename Online Team
How to Convert File Names in 3 Simple Steps
1
Upload Files
Select or drag multiple files into the upload area. All file types are supported — images, documents, videos, audio and more.
2
Choose Case Style
Pick from lowercase, UPPERCASE, Title Case, camelCase or kebab-case. The live preview instantly shows the converted names.
3
Download ZIP
Click the button and your renamed files are packaged into a ZIP archive and downloaded instantly. No server round-trip needed.
Who Needs a File Name Case Converter?
💻 Web Developers
Enforce kebab-case or camelCase conventions across image assets, stylesheets, and scripts before deployment. Prevent case-sensitivity bugs on Linux servers.
📸 Photographers
Standardise thousands of camera files from mixed-case originals like "DSC_1234.JPG" into clean lowercase names for portfolio sites and client galleries.
📄 Office Professionals
Apply Title Case to contracts, invoices and reports for a polished, consistent look across shared drives and email attachments.
🎓 Students & Researchers
Quickly rename research papers, datasets and notes into a uniform format for citation management tools and project submissions.
Why Choose Our Case Converter
Instant Processing
Files are processed in your browser with zero upload time. Even hundreds of files are converted in under a second.
100% Private
Your files never leave your device. No servers, no tracking, no cookies — total privacy guaranteed.
Works Everywhere
Fully responsive design works on desktops, tablets and smartphones. No app installation required.
5 Case Styles
lowercase, UPPERCASE, Title Case, camelCase and kebab-case cover every major naming convention.
Completely Free
No hidden costs, no signup, no limits. Rename as many files as you need, whenever you need.
Smart Extensions
File extensions are always preserved correctly. Convert names without worrying about breaking file types.
Frequently Asked Questions
What is file name case conversion?
File name case conversion changes the capitalisation pattern of file names. For example, "My Document.pdf" can become "my_document.pdf" (lowercase), "MY_DOCUMENT.PDF" (uppercase), "my-document.pdf" (kebab-case), or "myDocument.pdf" (camelCase).
Does it change the file content?
No. Only the file name is modified. The file content, quality, metadata and internal structure remain completely untouched. Images stay sharp, documents stay formatted, videos stay playable.
What happens to file extensions?
Extensions are preserved and handled separately. In lowercase mode, "Photo.JPG" becomes "photo.jpg". In UPPERCASE mode, it becomes "PHOTO.JPG". The extension always matches the selected case so your OS recognises the file correctly.
Is there a file size or count limit?
Individual files can be up to 100MB each to keep your browser running smoothly. There is no limit on the number of files you can process at once — upload as many as you need.
Are my files uploaded to a server?
Absolutely not. Everything runs inside your browser using JavaScript. Files are read, renamed and zipped on your own device. We have no server-side processing and no ability to see your files.
What about special characters and spaces?
Spaces are replaced with underscores (or hyphens for kebab-case). Special characters like @, #, & and others are stripped to produce clean, filesystem-safe names.
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