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Lowercase Converter

Text ToolsCase and Formatting
Language rules
Lowercase text —
Characters
—
Letters changed
—
Words
—
All-caps words kept
—

Paste your text and every capital letter is replaced by its small form while digits, punctuation and line breaks stay exactly where they were. HELLO World becomes hello world, with 6 of 11 characters changed. A checkbox keeps all-caps acronyms such as NASA, and a Turkish option lowers I to dotless ı.

About this tool

Text typed with Caps Lock on, headings pasted from a slide deck and spreadsheet columns of shouted product names all need the same fix: lower every capital without retyping. This converter does it while you type and reports how many characters it altered, which is a quick check that nothing else moved. It follows the Unicode case tables, so accented Latin, Cyrillic and Greek letters convert properly, including the Greek final sigma. Turkish and Azerbaijani writers can switch to their own rules for the dotted and dotless I. One limit: lowercasing is one-way, so proper nouns lose their capitals and need fixing by hand or the acronym option.

How to use it

  1. Add the text

    Paste into the box, type, or open a .txt, .md or .csv file from your device.

  2. Pick language rules

    Leave Standard Unicode on for most languages; choose Turkish / Azerbaijani for text in those languages.

  3. Protect acronyms if needed

    Tick the checkbox to leave words written fully in capitals, such as USB or UNESCO, unchanged.

  4. Copy the result

    Use Copy result and check the Letters changed count against what you expected.

Examples

A shouted greeting

Text to convert
HELLO World
Language rules
Standard Unicode
Keep all-caps words such as NASA or USB
No

Result Lowercase text: hello world
Characters: 11
Letters changed: 6
Words: 2
All-caps words kept: 0

  1. Each capital letter is replaced by its Unicode lowercase form (I → i, Ä → ä, Σ → σ or ς at a word end).
  2. 6 of 11 characters changed; digits, punctuation and spacing are left as they were.

Five capitals in HELLO and the W in World are lowered; the space is untouched, so 6 of 11 characters change.

Turkish dotless I

Text to convert
DIŞ KAPI
Language rules
Turkish / Azerbaijani
Keep all-caps words such as NASA or USB
No

Result Lowercase text: dış kapı
Characters: 8
Letters changed: 7
Words: 2
All-caps words kept: 0

  1. Each capital letter is replaced by its Unicode lowercase form using Turkish rules (I → ı, İ → i).
  2. 7 of 8 characters changed; digits, punctuation and spacing are left as they were.

Under Turkish rules the plain capital I lowers to dotless ı, giving dış kapı (outer door) instead of the wrong dis kapi.

Keeping an acronym

Text to convert
NASA Sent A Probe
Language rules
Standard Unicode
Keep all-caps words such as NASA or USB
Yes

Result Lowercase text: NASA sent a probe
Characters: 17
Letters changed: 3
Words: 4
All-caps words kept: 1

  1. Each capital letter is replaced by its Unicode lowercase form (I → i, Ä → ä, Σ → σ or ς at a word end).
  2. 3 of 17 characters changed; digits, punctuation and spacing are left as they were.
  3. 1 all-caps word kept as written.

NASA has two or more capitals and no lowercase, so it stays; the single letter A is treated as an ordinary word.

How it is calculated

output = each character mapped through the Unicode lowercase table (plus SpecialCasing context rules)

Unicode lowercase table
the one-to-one Lowercase_Mapping property, e.g. A to a, Ж to ж
SpecialCasing
context rules such as final sigma and the Turkish I mappings

Each letter is looked up in the Unicode case data that browsers implement. Characters with no lowercase form, such as digits, emoji and Arabic or Chinese script, pass through unchanged. With the acronym option, any word of two or more letters that is already entirely uppercase is skipped. Letters changed compares input and output character by character.

When not to use it

  • Text full of names and places will lose their capitals, so sentence case is a better fit there.
  • Passwords and case-sensitive codes change meaning when lowered.

Common mistakes

  • Lowercasing Turkish text with standard rules, which turns DIŞ into diş instead of dış.
  • Forgetting that brand names like iPhone or eBay come out as iphone and ebay.

Frequently asked questions

Why does the Turkish option exist?

Turkish has two separate letters: dotted i/İ and dotless ı/I. Standard rules lower I to i, which changes words in Turkish; the Turkish rules lower I to ı and İ to i, as Unicode SpecialCasing specifies.

What happens to the Greek capital sigma?

Σ becomes σ inside a word and ς at the end of a word, so ΟΔΟΣ converts to οδος. This follows the Final_Sigma rule in the Unicode standard.

Which words count as acronyms?

Any word with at least two letters that are all capitals, such as NASA, USB or PDF. A lone capital like A or I is treated as an ordinary word and is lowered.

Does it change numbers, emoji or punctuation?

No. Only letters with a lowercase form change. Digits, emoji, symbols, spaces and line breaks are copied through, and scripts without case such as Arabic stay as written.

Is my text sent anywhere?

No. Conversion runs in your browser using its built-in Unicode case functions, and the text is not saved after you leave the page.

Cite this tool

Using this tool in an assignment, article or report? Copy a citation, or a link for your website.

APA

Tools Directory Editorial Team. (2026, October 26). Lowercase Converter. Tools Directory. Retrieved October 26, 2026, from https://tools.milunir.com/text-tools/case-and-formatting/lowercase-converter/

MLA

Tools Directory Editorial Team. “Lowercase Converter.” Tools Directory, 26 Oct. 2026, https://tools.milunir.com/text-tools/case-and-formatting/lowercase-converter/. Accessed 26 Oct. 2026.

Chicago

Tools Directory Editorial Team. “Lowercase Converter.” Tools Directory. Last modified October 26, 2026. Accessed October 26, 2026. https://tools.milunir.com/text-tools/case-and-formatting/lowercase-converter/.

Link<a href="https://tools.milunir.com/text-tools/case-and-formatting/lowercase-converter/">Lowercase Converter – Tools Directory</a>