Case Converter

How a word is split

The field is trimmed, then a lowercase letter sitting against an uppercase letter gains a space between them. marketingLaunchPlan therefore becomes three pieces before any other split. XMLHttpRequest only breaks at the pR pair, because the leading capitals are not a lowercase-then-uppercase pair, so the rebuilt words are xmlhttp and request. The camelCase panel then shows xmlhttpRequest, the snake panel shows xmlhttp_request, and Title Case shows Xmlhttp Request. The page does not keep an acronym in capitals.

After that camel split, the text is cut on runs of whitespace, underscores, and hyphens. Those runs collapse, so foo__bar and foo - bar both become foo and bar. Each piece is lowercased with the ordinary JavaScript lowercasing of that word. Digits stay in the word they were glued to. 10 SEO Tips becomes 10, seo, and tips. camelCase joins them as 10SeoTips. snake_case joins them as 10_seo_tips. Title Case prints 10 Seo Tips, because the first character of 10 is already a digit and uppercasing it changes nothing.

The five result panels

camelCase leaves the first word in lowercase and capitalizes the first character of every later word, then concatenates with nothing between. A single word is only the lowercase word. snake_case joins the words with underscores. kebab-case joins them with hyphens. CONSTANT_CASE is the snake line passed through toUpperCase, so it is not a separate dictionary of abbreviations. Title Case capitalizes the first character of every word, including the first, and joins with a single space. The labels on the panels are camelCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case.

Copy output does not copy the label of the panel you are looking at. It copies the five values in panel order, with a newline after each except that the join itself supplies the breaks. Marketing Launch Plan copies as marketingLaunchPlan, then marketing_launch_plan, then marketing-launch-plan, then MARKETING_LAUNCH_PLAN, then Marketing Launch Plan. An empty Source text still publishes four newlines, because five empty strings are joined. The panels look blank, and the clipboard is those newlines, not an error. There is no button that clears the field.

Jobs for a naming form

Use the snake line when a column or a file should be marketing_launch_plan. Use the kebab line when a path segment should be marketing-launch-plan. That kebab line is not a full slug: punctuation is not stripped here. If the next step is a URL segment that must drop commas and accents, paste the title into the slug generator instead of copying kebab-case and hoping the comma disappeared. The slug page also deletes underscores rather than turning them into hyphens.

A list of identifiers that should be ordered alphabetically belongs on the text sorter after you have copied one of these lines per row. A search that should swap one spelling for another belongs on Find & Replace. This converter does not search inside a document. It only rebuilds the whole field as five naming forms. Word Counter counts the source if you need a length check; it does not change case.

Punctuation, apostrophes, and blank words

Characters other than whitespace, underscore, and hyphen stay attached to the neighboring word. hello, world splits into hello, and world. camelCase becomes hello,World. snake_case becomes hello,_world. kebab-case becomes hello,-world. CONSTANT_CASE becomes HELLO,_WORLD. Title Case becomes Hello, World. The comma is not a separator and it is not deleted. An apostrophe is the same kind of leftover: don't stop stays two words, don't and stop, and camelCase is don'tStop.

A field of only separators, after trim, produces no words, and every panel is empty. Mixed tabs and spaces count as the same separator run. The page never offers PascalCase as its own panel, snake_case with a trailing underscore, or a lowercase-only line that still contains spaces. Title Case is the spaced form. If you needed the original capitals preserved, they are already gone once the words are lowercased, including inside XMLHttpRequest.

Rules and limitations

Words are trimmed, split on a lowercase-to-uppercase boundary, then split on whitespace, underscores, and hyphens. Each word is lowercased. The five joins are camelCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case.

Punctuation other than underscore and hyphen stays inside the word. Copy output is the five values separated by newlines, including the empty join. There is no download, no mode switch, and no per-panel copy.

Common problems

If a comma or apostrophe appears in the middle of snake_case, it was part of the word. Delete it in Source text. The converter will not strip it for you.

If an acronym came out as xmlhttpRequest, the split only saw the lowercase-to-uppercase pair. The page does not have an acronym list.

Frequently asked questions

About this tool

Maintained by Toolbench. For large or deeply nested files, split the input into smaller batches and verify representative results before using them in an import or application. Report reproducible problems through Contact.