Text case converter: switch text to uppercase, lowercase, Title Case, camelCase, or capitalize sentences instantly. Free, no signup, runs in your browser.
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Last verified July 2026
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Text case converter: switch text to uppercase, lowercase, Title Case, camelCase, or capitalize sentences instantly. Free, no signup, runs in your browser.
7 words in, 4 capitals out, checked against 16 small words.
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A worked example: one input, four outputs
Take the input: "the future of work and AI". Mode 0 (lowercase) returns: the future of work and ai. Mode 1 (UPPERCASE) returns: THE FUTURE OF WORK AND AI. Both are single-pass transforms over all 7 words, so every character changes case exactly once.
Mode 2 (Title Case) is where the arithmetic gets interesting. The converter splits on whitespace into 7 words and applies a set of 13 small words: a, an, and, as, at, but, by, for, in, of, on, or, the, to, via, with, vs. That is 16 entries. A word stays lowercase only if it is small AND sits at index 1 through 5 of 0-6, so not first and not last. Word 0 ("the") is small but is capitalized because index 0 is exempt. Word 6 ("ai") is not in the set at all. Word 3 ("and") is small and interior, so it stays lowercase.
Result: "The Future of work and Ai". Wait, check each word: the -> The, future -> Future, of -> of, work -> Work, and -> and, Ai -> Ai. So the true output is "The Future of work and Ai" only if "ai" were small; it is not, so it becomes "Ai". The full correct output is: The Future of work and Ai. Count the case changes: 4 words gained a capital, 2 stayed lowercase, 1 was capitalized only at position 0.
Limits you should know before pasting
The converter is whitespace-only. A 40-word string with a tab or a newline between two words is still split on /\s+/, so tabs and newlines are treated like single spaces and collapse cleanly. But a hyphenated compound like "mother-in-law" is one token: mode 2 returns "Mother-in-law", leaving the interior "in" capitalized inside the hyphenation even though a standalone "in" would be lowercase.
Punctuation is not stripped. "hello, world" in mode 2 becomes "Hello, World" because the comma rides along with "hello," and the first-letter rule only capitalizes character 0. Sentence case mode 3 only reacts to . ! ? followed by whitespace; a colon, semicolon, or quote does not reset the capitalizer, so "he said: "stop"" leaves the word after the quote lowercase.
Mode 2's small-word set is fixed at 16 entries and is not style-guide aware. APA and Chicago both lowercase "with" and "vs" but capitalize longer prepositions like "between" or "through"; this converter capitalizes every word not on its list, so a 5-word title with "between" gains a capital that AP style would not give it. Acronyms are also case-clobbered: "NASA" in mode 0 becomes "nasa", so re-run uppercase originals through modes 0 or 1 only when the acronym casing does not matter.
