Turn Capitals Into Readable Text
The common version of this problem is straightforward: a block of text arrived in capitals — a pasted headline, a form field that forced uppercase, a colleague who left the caps lock on — and you need it to read normally again. Paste it above, pick lowercase, and every letter drops in one pass. Nothing is retyped. This is the operation people variously call converting capital to small letters, uncapitalizing text, or simply removing all caps from text; they all mean the same transform, and the lowercase mode is it.
There is a second, messier version, and it is the reason this page exists separately from
the main Text Case Converter. When caps lock is on and you also
reach for the shift key, every letter comes out backwards: you get
hELLO wORLD instead of Hello World. Lowercasing that gives you
hello world — technically clean, but it has thrown away the capitals you
actually meant. The Fix Caps Lock mode recognizes this pattern and flips
each letter back instead, recovering the sentence you intended.
What the three modes do
| Mode | Input | Result |
|---|---|---|
| lowercase | SEND THE PDF TO NASA | send the pdf to nasa |
| Fix Caps Lock | SEND THE PDF TO NASA | Send the PDF to NASA |
| Fix Caps Lock | hELLO wORLD | Hello World |
| UPPERCASE | send the pdf | SEND THE PDF |
A short note appears under the buttons whenever the text you paste looks like one of the two caps-lock patterns, so you do not have to inspect it yourself to know which mode to reach for.
How does it tell a stuck caps lock from ordinary capitals?
Two signals, checked in order. First it looks for the inverted pattern — words whose first
letter is lowercase and whose remaining letters are uppercase, like wORLD. If
at least half the words in the text look like that, the whole thing is treated as inverted
and flipped back. Otherwise it measures what share of the letters are uppercase; once that
passes eighty percent across at least eight letters, the text is treated as shouted and
rewritten into sentence case.
The eight-letter floor matters more than it sounds. Without it, a line that is legitimately
short and capitalized — OK, FBI, a single acronym on its own line
— would be misread as a caps-lock accident and quietly rewritten. Below that threshold the
text is left alone.
Why does my caps lock keep turning itself on?
If you are landing here repeatedly, the underlying cause is usually not the text but the keyboard. The three common ones: Sticky Keys or Toggle Keys is enabled, so a single tap latches; the caps lock key has been remapped, which some keyboard utilities and gaming layouts do by default; or on macOS the key has a deliberate short press-and-hold delay, which makes quick taps feel like they were ignored and get pressed twice. Windows also ships a Toggle Keys setting that plays a tone whenever caps lock changes state, which is the quickest way to confirm whether the key is firing when you did not mean it to.
None of that changes what to do with the text you already typed — paste it above and use Fix Caps Lock — but it is worth checking if this keeps happening, because no converter fixes the cause.
Will acronyms like NASA and PDF stay uppercase?
Yes, in Fix Caps Lock mode. Once the text has been normalized, it is checked against a
built-in list of a few hundred proper nouns and abbreviations — NASA, PDF, HTML, USA,
iPhone, JavaScript, PostgreSQL, place names, and so on — and any match is restored to its
conventional capitalization. That is why SEND THE PDF TO NASA comes back as
Send the PDF to NASA rather than Send the pdf to nasa.
The list cannot cover a company name or internal term it has never seen. For those, open Settings and add the term on its own line under your custom terms; it will keep exactly the capitalization you typed there, and custom entries are applied last, so they override the built-in list when the two disagree. Custom terms work in lowercase mode too, which is the way to lowercase a paragraph while holding a handful of acronyms intact.
Why does lowercase mode not capitalize anything at all?
Because that is the job it is for. Lowercase is the uniform transform — every letter goes down, no exceptions, which is what you want for slugs, CSS class names, database normalization, or comparing two strings that differ only in case. Fix Caps Lock is the selective one: it capitalizes sentence openings and known proper nouns, so the result reads like ordinary prose. If you specifically want sentence openings capitalized on text that is not caps-lock damaged, the Sentence Case Converter is the more direct tool.
Is my text uploaded anywhere?
No. Every mode on this page runs in your own browser using local JavaScript — nothing is sent to a server, stored, or logged, and the page keeps working if you go offline after it loads. That applies to the custom terms list as well, which lives only in the open page and is gone once you close the tab.
Related tools
- Text Case Converter — all seven case styles side by side, including alternating and inverse case.
- Sentence Case Converter — capitalize sentence openings without the caps-lock detection.
- Title Case Converter — headline capitalization with minor-word rules.
- Remove Text Formatting — strip bold, italics, and pasted styling from text.
- Whitespace Remover — clean up stray spaces and tabs after a paste.
Last reviewed: August 2026