Case Converter

What a case converter does

A case converter, sometimes called a letter case converter or a capitalization converter, changes how your text is capitalized without making you retype it. You paste a word, a sentence, or a whole document, and the tool rewrites it in the case you choose. It is the fastest fix for text that landed in the wrong style: a paragraph typed with Caps Lock on, a headline that needs Title Case, or a variable name that has to match a coding convention. Because every change is pure text capitalization, nothing about your wording, spelling, or punctuation changes, only the upper and lower case of each letter.

Uppercase to lowercase converter

Changing uppercase to lowercase is the single most common reason people reach for a case converter. If you accidentally typed a block of text with Caps Lock on, or pasted a heading that arrived in all caps, the uppercase to lowercase mode drops every capital letter down to lower case in one step. This lowercase converter handles a single word or thousands of lines at once and keeps your line breaks intact, so you can clean up an entire email, code comment, or spreadsheet column without retyping anything.

All caps to lowercase in one click

All caps text is hard to read and often reads as shouting, so converting all caps to lowercase is a quick way to make a message look calm and professional again. Paste the shouting text, pick the lowercase mode, and copy the result. Many people then run the output through Sentence case so the first letter of each sentence is capitalized properly. That two-step flow, all caps to lowercase followed by Sentence case, turns an angry-looking block of text into clean, normal prose in seconds.

Lowercase to uppercase converter

Going the other direction, the lowercase to uppercase mode raises every letter to a capital. This is useful for headings on posters and slides, for product codes and SKUs, for legal section headers, and for emphasis in short labels. Changing lowercase to uppercase is also handy when a spreadsheet or database expects values in a consistent capital format. As with every mode here, the conversion is instant and reversible: switch back to lowercase any time without losing your original text.

UPPERCASE

Every letter is capitalised. Used for acronyms (NASA, HTML), legal contract headings, road signs, and emphasis in informal writing. Avoid for long body text because all caps reduces readability by 13 to 19 percent according to typography research. Sentence case headings outperform all caps on web pages for comprehension.

lowercase

Every letter is in lower case. Common in branding for a minimalist feel (think airbnb, ebay). Also used in URLs, email addresses, and as the default for semantic HTML class names. Lowercase text feels approachable and modern, which is why many tech startups use it for logotypes.

Title Case (simple)

The first letter of every word is capitalised. Easy to apply but technically incorrect for most style guides because it capitalises short prepositions and articles that should stay lowercase. Good for quick formatting where strict adherence to AP or Chicago does not matter.

Title Case (AP Style)

Associated Press style title case. Capitalises words four letters or longer plus principal words (verbs, nouns, pronouns). Articles (the, a, an), short conjunctions (and, but, or), and short prepositions (to, of, in) stay lowercase unless they start or end the title. Used by most newspapers and magazines.

Title Case (Chicago Style)

Chicago Manual of Style title case. Stricter than AP. Capitalises all major words and lowercases articles, conjunctions, and prepositions of any length unless they begin or end the title. Used in book publishing, academic journals, and long-form magazine writing.

Sentence case

Only the first word and proper nouns are capitalised. The standard for modern UI copy (Google, Apple, Microsoft all use sentence case for buttons, menu items, and labels). Easier to read than title case and feels more conversational. Recommended for body copy, blog post titles in modern publications, and most product writing.

camelCase

First word lowercase, every subsequent word starts with a capital letter, no spaces. The convention for JavaScript variables (myVariable), function names (calculateTotal), and Java method names. Also used in Objective-C, Swift method names, and many JSON API field names.

PascalCase

Like camelCase but the first letter is also capitalised. Used for class names in most object-oriented languages (MyClass), React component names (MyComponent), C# methods, and type names in TypeScript. Visually distinguishes types from variables in mixed code.

snake_case

All lowercase with words separated by underscores. The convention in Python (my_variable, calculate_total), Ruby method names, most SQL column names (and database identifiers in general), and the names of many configuration files in Linux. Easier to read than camelCase in long identifiers.

kebab-case

All lowercase with words separated by hyphens. Required in URLs (gizmoop.com/ case-converter), CSS class names following BEM conventions, HTML attribute names (data-user-id), and command-line flags (--max-depth). Cannot be used as a JavaScript variable name because the hyphen is a minus operator.

CONSTANT_CASE

All uppercase with underscore separators. Used for constants in most languages (MAX_RETRIES = 5, API_KEY, DEFAULT_TIMEOUT). Signals to readers that the value does not change at runtime. Also used for environment variables (DATABASE_URL) and for SQL keywords by convention.

dot.case

All lowercase with dots between words. Used in configuration file paths (server.host, database.port), namespaced HTML class names in some older frameworks, and feature flag names (feature.new.checkout.enabled). Common in Java property files and Spring configuration.

aLtErNaTiNg cAsE and InVeRsE CaSe

Mostly used for ironic emphasis on social media to mock a previous statement. Inverse case swaps the case of every letter, which is useful for inverting a paragraph that was accidentally typed with Caps Lock on. Neither has serious production use, but both are included for completeness.

Title case converter: which style to choose

A title case converter capitalizes the important words in a heading while leaving small words lowercase. The hard part is that "important" depends on the style guide you follow. This tool gives you three options. Simple Title Case capitalizes the first letter of every word, which is quick but not technically correct. AP Style follows the Associated Press rules used by most newspapers and blogs. Chicago Style follows the Chicago Manual of Style rules used by book publishers and academic journals. If you are not sure, AP Style is the safe default for web content and most online writing.

How to capitalize each word in a list or headline

To capitalize each word in a phrase, paste it into the box and read the Title Case card. Every line is treated separately, so you can capitalize each word across a whole list of headlines, menu items, or product names at once. If you want strict capitalization that keeps articles and short prepositions lowercase, use the AP or Chicago card instead of simple Title Case. The output is ready to copy straight into a CMS, a slide deck, or a spreadsheet.

Text capitalization for SEO titles and meta descriptions

Consistent text capitalization makes a site look polished and helps search engines and readers scan your pages. Many SEO teams write title tags in Title Case and meta descriptions in Sentence case, then run every new draft through a capitalization converter so nothing slips through in the wrong style. Because this tool shows all 14 cases side by side, you can compare a Title Case headline against the Sentence case version and pick whichever reads better before you publish.

Convert a whole column or list at once

This lowercase converter and capitalization tool is not limited to single phrases. Paste a multi-line list, a CSV column, or an exported spreadsheet column, and every line is converted in place with its line breaks preserved. You can lowercase an entire column of email addresses, switch a list of headings to Title Case, or push product codes to uppercase, then copy the block back into your sheet. For very large inputs, work in batches of a few thousand lines to keep your browser responsive.

Why use an online case converter instead of retyping

Retyping text just to fix its capitalization wastes time and introduces typos. An online case converter changes uppercase to lowercase, lowercase to uppercase, or any other case instantly, with no risk of altering your words. It is faster than reformatting in a word processor, works on any device with a browser, and runs entirely on your machine so your text stays private. Whether you need a quick all caps to lowercase fix or a precise AP Style title, the result is one click away.

How to change capital letters to lowercase

To change capital letters to lowercase, paste your text into the box and read the lowercase card. Every capital letter to lowercase conversion happens as you type, so a single capitalized word, a shouting headline, or a full paragraph is fixed without a convert button. This is the standard way to change capital letters to lowercase when you have pasted content from a PDF, a slide deck, or a system that stores everything in caps. Because the tool only adjusts case, your spelling, spacing, and punctuation stay exactly as they were.

All caps converter for headings and labels

An all caps converter pushes every letter to a capital, and it works the opposite way too: paste shouting text and the lowercase card gives you a clean all caps to lowercase result. Designers use the all caps mode for short button labels, navigation items, and poster headlines, while editors use the lowercase side to calm down copy that arrived in full caps. Keep all caps short. For anything longer than a heading, Sentence case or Title Case reads far better and is easier to scan.

Capitalization converter for consistent writing

A capitalization converter keeps a document, a website, or a content library consistent. Inconsistent capitalization, where some headings are in Title Case and others in Sentence case, makes a page look unfinished. Paste each new draft into this capitalization converter, pick the case your style guide expects, and copy the corrected version back. Teams that publish at volume often standardize on Sentence case for body copy and one title case style for headings, then run everything through the converter so nothing slips through in the wrong format.

Lowercase converter online with no install

This is a lowercase converter online, which means there is nothing to download and no account to create. Open the page, paste your text, and the lowercase card updates instantly. A browser-based lowercase converter works the same on Windows, macOS, Linux, Android, and iOS, so you can switch capital letters to lowercase on a phone just as easily as on a laptop. Everything runs locally, so even a long document never leaves your device.

Letter case converter vs. word processor formatting

Word processors hide case changes inside a menu and often apply them as display formatting rather than real character changes, which can revert when you copy the text elsewhere. A dedicated letter case converter rewrites the actual letters, so the uppercase to lowercase or Title Case result is permanent and travels cleanly into a CMS, an email, code, or a spreadsheet. It also shows every case at once, so you can compare options side by side instead of clicking through a submenu.

Common case conversion mistakes to avoid

The most common mistake is using simple Title Case when a style guide expects AP or Chicago rules, which leaves short words like "of" and "the" wrongly capitalized. Another is converting all caps to lowercase and forgetting to restore Sentence case, which leaves the first letter of every sentence lowercase. In code, mixing camelCase and snake_case in one file is a frequent slip. Pick the case that matches your context first, then convert, and re-read the output once before you publish or commit it.