Lowercase Converter
Drop every capital in one paste. Useful for taming text that arrived in all caps, for normalising data before you compare it, and for the deliberately lowercase tone a lot of brands and captions use.
If the text you are fixing was a whole paragraph typed with caps lock on, lowercase alone leaves you with no sentence capitals. Sentence case is usually the better tool for that job, and it is one click away.
Want proper sentence capitals back? Use sentence case
Lowercase Examples
Lowercasing affects letters only. These rows cover the cases people ask about most.
| Input | Output | What it shows |
|---|---|---|
| HELLO WORLD | hello world | The basic conversion. |
| Mixed Case Input | mixed case input | Existing lowercase letters are unaffected. |
| ITEM 1: 50% OFF! | item 1: 50% off! | Digits and symbols pass through untouched. |
| CAFÉ RÉSUMÉ | café résumé | Accented capitals lower correctly and keep their accents. |
| NASA AND HTML | nasa and html | Acronyms are lowercased too — there is no way to detect them automatically. |
| LINE ONE LINE TWO | line one line two | Line structure is preserved. |
| İSTANBUL | i̇stanbul | The Turkish dotted capital I lowercases according to your browser locale. |
| A B C | a b c | Multiple spaces survive intact. |
What Lowercasing Does
A straightforward Unicode mapping, with two details worth knowing.
Every cased letter maps to its lowercase form
The mapping is defined by Unicode, not by a lookup table of English letters, so Greek, Cyrillic and accented Latin all lowercase correctly alongside A-Z.
Nothing else is touched
Digits, punctuation, whitespace and symbols pass through unchanged, so the shape of your document survives the conversion exactly.
It is a lossy operation
The original capitalisation is discarded and cannot be recovered. If you might need it back, keep a copy of the original before converting.
It is the standard normalisation step
Lowercasing both sides before comparing strings is how case-insensitive matching is usually implemented, which is why this conversion shows up so often in data cleaning.
Lowercase and Its Neighbours
If plain lowercase leaves your text looking unfinished, one of the rows below is probably what you meant.
Shared input: THE MEETING STARTS AT NOON. BRING NOTES.
| Transformation | Result | Reach for it when |
|---|---|---|
| lowercase | the meeting starts at noon. bring notes. | You want everything lowered, including sentence starts. |
| Sentence case | The meeting starts at noon. Bring notes. | You want normal prose capitalisation back. |
| Title Case | The Meeting Starts At Noon. Bring Notes. | The text is a heading rather than a sentence. |
| iNVERSE cASE | the meeting starts at noon. bring notes. | The capitalisation is exactly backwards. |
Where Lowercasing Loses Information
Four things that do not survive a lowercase pass, and what to do about each.
Acronyms become words
NASA becomes nasa and HTML becomes html. Nothing can distinguish an acronym from an emphasised word without a dictionary, so restore them by hand afterwards.
Proper nouns lose their capitals
Names, places and brands all lowercase. If your text is mostly names, title case is a better starting point than lowercase.
Sentence starts are lost
Lowercasing a paragraph leaves it with no sentence capitals at all. Sentence case does the same job while putting the capitals back where they belong.
Turkish and Azeri dotted i
Those languages distinguish dotted and dotless i, so the correct lowercase of "I" differs from English. The conversion follows your browser's default locale rules, which are correct for English.
Where Lowercasing Matters
Lowercase is the workhorse of text normalisation, and a stylistic choice in its own right.
Data cleaning
Email addresses, usernames and tags are usually compared case-insensitively. Lowercasing both sides first is the simplest way to guarantee that.
URLs and slugs
Paths are case-sensitive on most servers, so lowercase slugs avoid an entire class of broken link. Lowercase before you generate the slug, not after.
Brand and caption style
A deliberately lowercase voice reads as informal and modern. It is a real style choice, but be consistent — half-lowercase text reads as a mistake.
Search and tagging
Hashtags and search terms are matched case-insensitively on most platforms, so lowercasing them costs nothing and keeps a tag list tidy.
Reasons to Lowercase
Calming down pasted text
Content copied from a poster or a slide often arrives entirely capitalised. One paste makes it usable again.
Preparing a comparison
Lowercasing both strings before comparing removes a whole category of "why does this not match" bug.
Consistent tags and keywords
A tag list in mixed case creates duplicate tags that differ only by capitalisation. Lowercase the list first.
Deliberate lowercase styling
Captions and brand voice increasingly use all-lowercase text. Doing it in one pass keeps it consistent across a whole post.
Frequently Asked Questions
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