Lower Case Converter

Lowercasing is the simplest conversion on the site, and the result appears without pressing any convert button.

1. Paste or type your text into the Input box. Use Paste to take text from the clipboard, or Clear to start again.
2. Look at the box labelled lowercase text. It updates on every keystroke, and line breaks and spacing stay exactly as they were.
3. Press Copy to copy the result, Download .txt to save it, or Use as input if you want to run it through another change.

Two quick examples: Hello WORLD becomes hello world, and the email address John.Smith@Example.COM becomes john.smith@example.com. The Words, Characters and Lines figures under the Input box tell you how much text you are converting. Everything is processed locally in your browser, so usernames, addresses and other sensitive strings are not sent anywhere.

The tool uses the standard Unicode case rules built into your browser, so it handles far more than the letters A to Z. Any letter that has a lowercase form is changed. Digits, punctuation, emoji and scripts without case, such as Chinese and Japanese, pass through untouched.

Greek is handled with the final-sigma rule, so the last letter of the word in the third row becomes the closing form ς. One oddity is worth knowing. The tool applies the general, language-neutral rules and not Turkish ones, so a capital dotted İ becomes a lowercase i followed by a separate combining dot, which can look strange and may not match a plain i in searches. If you work with Turkish text, check those words.

Many systems compare text character by character, which makes Admin and admin different values. Normalising to lowercase removes a whole class of mismatches.

• Email lists. Most mail providers treat addresses as case-insensitive, so John@Example.com and john@example.com reach the same inbox but count as two rows in a mailing list. Lowercase them before you merge lists.
• Usernames and tags. Many sites compare names case by case. Lowercase hashtags and handles also avoid duplicates.
• File names and paths. Linux servers treat Photo.JPG and photo.jpg as different files, so a link with the wrong capital can return a 404 error.
• Data matching. Lookups, joins and filters in spreadsheets and databases often fail when one side has stray capitals.

The opposite risk is just as real. Do not lowercase passwords, access tokens, Base64 strings or case-sensitive IDs, and be careful with whole URLs, because the path and query part may be case-sensitive even though the domain is not. For URL-friendly text built from a title, the URL slug generator lowercases and cleans the text in one go.

When a document is already open in an office application, its own tools are handy. Microsoft Word has the Change Case menu on the Home tab, Excel and Google Sheets have a LOWER function such as =LOWER(A1), and Google Docs has a Capitalization option in its Format menu. For text that lives outside those programs, such as a form field, an email or a code editor, paste it into this page instead.

Lowercase is often just the first step. The upper case converter does the reverse, and the sentence case converter lowercases text and then restores capitals at the start of each sentence. If you are cleaning a list of emails, the duplicate line remover can ignore case while it deletes repeats, so you may not need to lowercase first.

A typical clean-up of a mailing list runs like this: paste the column of addresses, lowercase it, press Use as input, then deal with spaces and repeats. Because every address stays on its own line, the result pastes straight back into a spreadsheet column. Hashtags are a special case. All-lowercase tags are tidy, but a tag written in camel case is easier to read and is pronounced word by word by screen readers, so for those the capitalized case converter is the better choice.