About this case converter
A free online case converter tool for every letter case
A case converter changes capitalization without rewriting the words. You paste text, pick a mode, and copy the result. This site is a case converter online: a free case converter tool that runs in your browser, so drafts, customer names, and source code never leave the tab.
People look for an online case converter when Caps Lock wrecked a paragraph, when a headline needs Title Case, or when a CMS wants lowercase slugs. A letter case converter and a text case converter are the same job with different names. A universal case converter does several of those jobs on one paste — sentence case, title case, upper case, lower case, capitalized (proper) case, camelCase, and URL slugs. Use the editor above, or open a dedicated page when you already know the mode.
Convert uppercase to lowercase (capital to small letters)
The most common request is simple: convert uppercase to lowercase. If a document arrived in ALL CAPS, you want an uppercase to lowercase converter that changes every letter and keeps spaces, numbers, and line breaks. That is the lower case converter. For Word, Excel, and when the browser pass is faster, see how to convert uppercase to lowercase online.
Paste once to convert uppercase to lowercase online, change all uppercase to lowercase, or convert from uppercase to lowercase in one click. The same tool is a capital to small letters converter. Searches such as capital to small, capital to small letter, capital to small case, convert capital to small, capital to small converter, and capital to small online all describe this transform. From capital to small letters, matching uppercase to lowercase letters is a locale-aware lowercase pass — including Turkish dotted I — still fully offline.
How to change uppercase to lowercase in Word. In Microsoft Word, select the text, then use Home → Change Case → lowercase, or press Shift+F3 to cycle. That is fine for a sentence already in a .docx. It is slow for a whole export, and it does not help if the text lives in a browser, an email, or a CMS. Paste into this uppercase to lowercase online tool, copy, and put the result back into Word. Word change uppercase to lowercase and word uppercase to lowercase are the same command; this page is the faster path when you are not already inside a document.
Convert uppercase to lowercase in Excel. Excel uppercase to lowercase uses a formula: =LOWER(A1). Fill down the column, then paste values. That is the right move for a spreadsheet you will keep. For a one-off list, change from uppercase to lowercase here and paste the column back — no formula, no helper column. How to convert uppercase to lowercase is the same idea in both apps: pick lowercase, or paste into this converter when the text is not in a cell yet.
Title case, sentence case, and proper case
A title case converter capitalizes headlines the way a style book would. This one is also an AP title case converter, with APA, Chicago, and MLA small-word lists so “and” and “the” stay lowercase unless they start or end the title. Brands such as NASA and iPhone are restored after the style pass. Use it for blog titles, news headlines, and documentation H1s. Compare the four styles in AP vs APA vs Chicago vs MLA title case.
A sentence case converter capitalizes the first letter of each sentence and lowercases the rest — the default voice of email, UI copy, and most body text. Use it when Title Case feels too loud, or when someone sent you a block of mixed caps that should read like ordinary prose.
Capital case converter, cap case converter, and proper case converter usually mean Capitalized Case (Start Case): every word stands up, including short words such as “of” and “the”. That is the blunt cousin of Title Case, useful for names, form labels, and playlist titles. An upper case converter is different: it turns every letter into capitals (lower case to upper case). Use UPPER CASE for labels and legal clauses, not for publication headlines. For side-by-side examples, see title case vs sentence case vs capitalized case.
Alternating case and inverse case
Need playful emphasis instead of a style-guide headline? The alternating case converter builds aLtErNaTiNg caps letter by letter for memes and mock quotes. The inverse case converter flips whatever capitalization is already there (Hello → hELLO). Both stay in this tab — use them when Title Case and Sentence case are the wrong tone.
Camel case converter
A camel case converter turns phrases, snake_case, and kebab-case into camelCase identifiers. HTMLParser becomes htmlParser. Use it for JavaScript variables and object keys, then switch to PascalCase, snake_case, or kebab-case without pasting again. The homepage programming-case row exposes those modes on the same paste.
URL slug generator
A slug generator — also called a URL slug generator, online slug generator, online text to slug generator, or custom slug generator — lowercases, strips leftover punctuation, and joins words with hyphens. Café déjà-vu 2024! becomes cafe-deja-vu-2024. This bulk slug generator converts one title per line, so a sitemap of headlines becomes a list of handles in one pass.
It is an SEO-friendly slug generator for Arabic as well: Arabic letters stay in the slug instead of being deleted, which is what search engines actually index for Arabic URLs. Latin accents still fold to ASCII. German ß becomes ss. Pair it with Title Case when you are deriving a permalink from a headline.
Convert a PHP or JavaScript array to JSON
Need to convert array to JSON? The array to JSON converter accepts a PHP array to JSON paste — array('a' => 1) or the short ['a' => 1] form — so php convert array to json, convert php array to json, and array to json php all land on one page. A JavaScript array to JSON paste works too: js array to json and convert array to json javascript handle single quotes, unquoted keys, and trailing commas. Power Automate array to JSON is the same pipeline: paste the output of a Compose or Select action, or a createArray() expression. Pretty JSON comes back in this tab.
Guides
New explainers for writers and product teams: AP vs APA vs Chicago vs MLA title case, how to change case in Word, Excel, and Google Docs, and sentence case vs title case for UI copy. For SERP title casing, see title case for SEO and SERP titles. Browse the full list on the blog.
How to use this case converter tool
- Paste or type in the left-hand field, or drop a .txt file on the card.
- Pick sentence case, lower case, UPPER CASE, Capitalized Case, Title Case, alternating case, inverse case, or a programming case. Title Case lets you choose AP, APA, Chicago, or MLA.
- Copy with the button or Ctrl/Cmd+Enter. Download if you want a file back.
- Jump to any dedicated tool with Ctrl/Cmd+K. The current paste stays in this tab, so you can go from this homepage case converter to camelCase or the slug generator without copying again.
Every conversion is client-side JavaScript. There is no account, no database, and no server-side processing of your paste. That is the product bet: faster than a noisy ad page, more precise than a single unnamed “title case,” and honest about privacy. Browse the full directory when you need counters, cleanup, JSON, or Unicode fonts — still processed in your browser.
