Case Converter Online — 16 Formats Free
Case converter online — switch between camelCase, snake_case, kebab-case, Title Case, and 12 more in one click. Free, browser-based, no signup.
Pick a case format
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PDFFlare's case converter online switches text between every common case format — lowercase, UPPERCASE, Title Case, Sentence case, camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, Train-Case, dot.case, path/case, Header-Case, Alternating, Inverse, and URL Slug. Sixteen formats in one tool, with smart word-splitting that handles tricky inputs like XMLHttpRequest, file2name, and accented characters correctly the first time.
Working on text? Pair this with Word Counter to verify length budgets, Text Diff to compare two versions, or Lorem Ipsum Generator when you need filler copy to test downstream layouts.
Every conversion runs locally in your browser. Pure JavaScript functions transform the input — nothing uploads, nothing logs. Live stats (characters, words, lines, paragraphs, sentences, reading and speaking time, average word length, longest word) update on every keystroke so you can keep an eye on length budgets while you convert.
How to Convert Text Case
Paste your text
Drop any text into the input area — code identifiers, sentences, paragraphs, headlines. The tool reads what you have and prepares to convert it.
Pick a case format
Choose from 16 formats: lowercase, UPPERCASE, Title Case, camelCase, snake_case, kebab-case, CONSTANT_CASE, URL Slug, and 8 more. The result updates live as you switch formats.
Copy or swap and reuse
Click 'Copy result' to grab the converted text, or 'Swap ↔' to push the result back as input for chained conversions (e.g., camelCase → snake_case → kebab-case).
When Do You Need a Case Converter Online?
Code refactoring (camel ↔ snake): You're wiring a JavaScript front-end (camelCase) to a Python or Ruby back-end (snake_case). Field names need to round-trip without bugs. Paste a list, switch case, paste back — no manual find-and-replace, no missed transforms.
CMS and API field naming: GraphQL prefers camelCase, REST APIs are often snake_case, database columns are usually CONSTANT_CASE, and HTTP headers are Train-Case. One tool produces every variant from a single source of truth so your schema stays consistent.
URL slug generation: Editorial copy becomes a URL slug. “The 10 Best Café Résumés of 2026” → “the-10-best-cafe-resumes-of-2026.” Accented characters get folded, punctuation becomes hyphens, capitalization disappears — exactly what your CMS or static-site generator expects.
Editorial copywriting: Marketing decks alternate between sentence case headlines and Title Case CTAs depending on the platform. Convert in one click, keep the live stats panel open to track headline length budgets alongside the conversion.
Why Choose PDFFlare's Case Converter Online?
16 Case Formats
Every common variant — programming, editorial, URL, and obscure — in a single tool. Pick once, switch any time, no installs.
Smart Word-Splitting
Handles XMLHttpRequest, IOError, and file2name correctly. Recognizes case transitions, acronym boundaries, and letter-to-digit splits.
Live Stats Panel
Characters, words, lines, paragraphs, sentences, reading and speaking time — all updating live as you convert. Catch length budget issues before they ship.
100% Browser-Based
Every transform runs in your browser as a pure JavaScript function. Nothing uploads, nothing logs. Safe for code under NDA, customer copy, and internal identifiers.
Frequently Asked Questions About Case Converter
Both squeeze multiple words together and capitalize each subsequent word — the only difference is the first letter. camelCase keeps the first word lowercase (helloWorld); PascalCase capitalizes it too (HelloWorld). JavaScript and Java conventionally use camelCase for variables and methods, PascalCase for classes and types. PDFFlare's case converter outputs both correctly with smart word splitting.
It runs Unicode NFKD normalization on the input, strips combining diacritical marks, lowercases everything, then replaces any non-alphanumeric character with a hyphen and trims leading/trailing hyphens. So “Café Résumé” becomes “cafe-resume” — perfectly safe for URLs and file paths.
Yes. PDFFlare's tokenizer recognizes acronym boundaries: it splits XMLHttpRequest as XML / Http / Request rather than mangling it as XMLHTTP / Request. The same logic handles APIv2Endpoint → API / v2 / Endpoint and IOError → IO / Error. Convert to snake_case and you get xml_http_request.
Yes — letter-to-digit and digit-to-letter boundaries become token splits. file2name tokenizes as [file, 2, name], so snake_case yields file_2_name and camelCase yields file2Name. Numbers are never dropped. If you want them stuck to the previous word, the lowercase, UPPERCASE, and Inverse Case formats preserve the input verbatim.
No. PDFFlare's case converter runs entirely in your browser — every transform is a pure JavaScript function on your machine. Nothing uploads, nothing logs. Safe for production identifiers, internal API field names, customer copy under NDA, and anything else you wouldn't want pasted into a third-party tool.
They produce identical output (Hello-World) but the names come from different communities. “Train-Case” is the Lisp/Lodash convention; “Header-Case” is what HTTP-header authors call it (Content-Type, X-Forwarded-For). PDFFlare exposes both labels so you can pick whichever your team uses without translating.
It splits on sentence-ending punctuation (period, exclamation, question mark) followed by whitespace, then capitalizes the first letter after each split plus the very first character of the input. The rest is lowercased. It doesn't do natural-language parsing, so abbreviations like “e.g.” will create extra capitalization — for those edge cases, prefer Title Case or do a manual fix-up.
Editorial workflows almost always need both. You're not just converting case — you're also checking whether a headline fits a character budget or a meta description fits Google's 160-character cap. PDFFlare's case converter shows characters, words, lines, paragraphs, sentences, reading time, speaking time, average word length, and longest word — all live as you type or convert.