Text Case & Spelling Converter Tool

Text Case & Spelling Converter

Convert text between Sentence case, UPPERCASE, lowercase, Title Case, and standardize British & American English spelling across 400+ word differences.

Input
0 words 0 chars 0 lines
Output — Sentence case

How to Use the Text Case & Spelling Converter

  1. Type or paste your text — Enter any text in the input area. All conversions happen instantly.
  2. Choose a conversion mode — Select from Sentence case, UPPERCASE, lowercase, Title Case, UK → US, or US → UK.
  3. View the output — Your converted text appears in the output area below.
  4. Track changes — When using UK ↔ US conversion, the changes strip shows every word that was converted.
  5. Copy or download — Use the Copy button to copy the result or Download to save as .txt file.

Why Text Case & Spelling Conversion Matters

Proper text formatting is essential for professional writing, academic work, content creation, and SEO. Whether you need to convert blog posts to Title Case for headlines, standardize documents to UPPERCASE for emphasis, or ensure your content uses consistent English spelling (British vs American), this tool makes it effortless.

The spelling converter handles over 400 common British-American spelling differences, including -our/-or words (colour/color), -ise/-ize words (organise/organize), -re/-er words (centre/center), and many more. All conversions happen locally in your browser — no data is ever sent to any server.

Key Features

  • Six Conversion Modes — Sentence case, UPPERCASE, lowercase, Title Case, UK → US, and US → UK.
  • 400+ Spelling Differences — Comprehensive dictionary covering -our/-or, -ise/-ize, -re/-er, double consonants, and more.
  • Real-time Updates — Results update instantly as you type or paste.
  • Change Tracking — Shows exactly which words were converted and how many times.
  • Spelling Detection — Automatically detects UK and US spellings in your text.
  • Copy & Download — Copy results to clipboard or download as .txt file.
  • 100% Private — All conversions happen locally in your browser.

Frequently Asked Questions

UK (British) English is the default reference spelling. The converter transforms text between British and American English, with UK spelling used as the baseline dictionary.
Over 400 common spelling differences between British and American English, including -our/-or words, -ise/-ize words, -re/-er words, double consonants, and other common variations.
Sentence case capitalizes only the first letter of each sentence. Title Case capitalizes the first letter of every major word, commonly used for headlines. Lowercase converts everything to small letters, and UPPERCASE converts everything to capital letters.
No, the converter only changes words that match its dictionary of known spelling differences. For example, it changes colour to color in US mode but leaves color unchanged. The changes list shows exactly which words were converted.
This tool focuses on spelling differences only. Grammatical differences such as collective nouns or past tense forms like learned versus learnt are not automatically converted.
When using British to American or American to British conversion, the changes list shows every word that was converted, the replacement used, and how many times it appeared.

Free Text Case & Spelling Converter

Convert text instantly between Sentence case, UPPERCASE, lowercase, and Title Case, or standardize British and American English spelling across 400+ common word differences — colour/color, organise/organize, centre/center, travelling/traveling, and more. The changes list shows exactly what was converted, so nothing changes silently. Everything runs locally in your browser; your text is never sent to a server.

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All conversions are performed locally in your browser. No data is sent to any server.

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