Case Converter
Instantly convert UPPERCASE, lowercase, Sentence case, Title Case, and reverse text or word order. Pro Mode adds camelCase, snake_case, kebab-case, upside-down text, Base64/URL tools and bulk file processing.
To reverse or convert case in Google Docs or Word without breaking line spacing: convert your text here first, then paste using Ctrl+Shift+V (Windows) or Cmd+Shift+V (Mac) to paste as plain text, this preserves your paragraph breaks exactly instead of carrying over formatting from the source.
Drop a .txt or .csv file here, or click to browse
Each line is processed independently, nothing is uploaded anywhere.
How to Use the Case Converter
From messy capitalization to the exact case you need. No signup, nothing ever leaves your browser.
Everything above runs entirely in your browser. Your text is never uploaded to a server, so it stays completely private from start to finish.
Case Converter, Free and Online
A case converter instantly changes text between UPPERCASE, lowercase, Sentence case, Title Case, camelCase and more, without retyping anything. This one runs entirely in your browser, converts as you click, and never uploads your text to a server.
Almost everyone has typed a paragraph with Caps Lock accidentally on, or pasted a heading that needs Title Case for a report, or needed a variable name converted from spaced words into camelCase for code. This case converter online tool handles all of it with one click: UPPERCASE, lowercase, Sentence case and Title Case are free, along with text and word-order reversal and a one-click Caps Lock fix. Pro Mode adds the programming cases developers actually use, camelCase, PascalCase, snake_case and kebab-case, plus upside-down text, Base64 and URL encoding tools, and bulk processing across multiple files.
1Simple vs Pro, What Each Mode Includes
| Feature | Simple Mode | Pro Mode (Free) |
|---|---|---|
| UPPERCASE, lowercase, Sentence case, Title Case | Included | Included |
| Reverse text entirely or reverse word order | Included | Included |
| Fix Reverse Caps Lock, invert letters inside words | Included | Included |
| Upload TXT, DOCX, PDF, MD or RTF files | Included | Included |
| camelCase, PascalCase, snake_case, kebab-case | Not included | Included |
| Alternating case, mixed case, upside-down and mirror text | Not included | Included |
| Base64 and URL encode/decode tools | Not included | Included |
| Google Docs / Word plain-text paste guide | Not included | Included |
| Bulk case conversion across multiple file rows | Not included | Included |
2Common Reasons People Convert Text Case
Developers are a large share of the audience here, since consistent naming conventions matter across a codebase, and manually retyping a phrase into camelCase or snake_case for every variable gets tedious fast. Writers and students lean more on Title Case and Sentence case, particularly when formatting headings for essays, reports or presentation slides where a style guide expects consistent capitalization throughout the document. Content teams managing large numbers of product titles or blog headlines also reach for bulk case conversion, since fixing capitalization one entry at a time across a spreadsheet export quickly becomes impractical.
The Fix Reverse Caps Lock option solves a smaller but surprisingly common problem. Anyone who has typed a paragraph without noticing Caps Lock was on ends up with every letter inverted, capitals where lowercase should be and vice versa. Retyping the whole thing is the obvious fix, but swapping the case of every character instantly restores the intended text without losing a single word, which is exactly what this option does.
3Title Case Rules Actually Vary by Style Guide
Title Case looks simple until you notice that different publications capitalize slightly differently. The core rule most guides agree on: capitalize the first and last word, and every major word in between, while lowercasing minor words like articles, coordinating conjunctions, and short prepositions. Where guides disagree is on exactly which prepositions count as short enough to lowercase, and how they treat hyphenated words. The APA Style guide on title case lays out one widely used version of these rules, useful context if your Title Case result looks slightly different from what another tool produces.
| Case Style | Example | Typical Use |
|---|---|---|
| Title Case | Hello World | Headings, book titles, report sections |
| Sentence case | Hello world | Emails, paragraphs, standard prose |
| camelCase | helloWorld | JavaScript and Java variable names |
| snake_case | hello_world | Python variables, database columns |
| kebab-case | hello-world | URL slugs, CSS class names |
Every conversion, including Pro Mode's programming case formats, Base64/URL tools and bulk file processing, runs entirely in your browser using JavaScript. Nothing you paste is ever sent to a server.
4Frequently Asked Questions
Grounded in an established style guide, not guesswork. The Title Case capitalization rules follow APA Style's own guidance on title case. For related tools on the rest of this site, see the AI Writing Analyzer and the full SmallStudyTools.com tool library.
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