Free US → UK English tool
American to British English Converter
Paste American English below and see common British English spelling, vocabulary and date-format changes instantly.
Convert US English to UK English
Type or paste on the left. The converted version appears on the right.
Note: this tool handles common general-language differences. Context-sensitive, legal, technical and brand-specific wording may still need human review.
Common US → UK changes
The converter focuses on everyday spelling, vocabulary and date differences rather than rewriting your meaning.
Spelling
color → colour
organize → organise
defense → defence
Vocabulary
apartment → flat
elevator → lift
zip code → postcode
Dates
December 31, 2025
→ 31 December 2025
Toggle date conversion on or off.
Quotation style
Optional conversion of straight double quotation marks to single quotation marks.
Human review
Need a British English editor?
Use the converter for a quick first pass. For client-facing, academic, legal, technical or brand-sensitive material, a human review can check the choices the tool should not guess.
- Tone and natural UK wording
- Terminology and context
- House-style consistency
- Dates, punctuation and formatting
American to British English converter FAQ
What does the converter change?
It changes a reviewed set of common US spellings and vocabulary to UK equivalents and can convert written US date formats. It does not attempt to rewrite every contextual term.
Does it replace a British English editor?
No. Automated conversion is useful for routine differences. Human review is more appropriate when tone, specialist terminology, consistency or intended audience matters.
Does it always change -ize to -ise?
The built-in converter changes common reviewed examples such as organize → organise. British English can use different house styles, so important publishing work should follow the style required by your organisation.
Can I use it for legal or technical documents?
You can use it as a first pass for ordinary spelling differences, but jurisdiction-specific legal wording and specialist technical terminology should be reviewed in context rather than converted automatically.