US ↔ UK English Converter
Convert written text between American and British English seamlessly. Automatically adjusts spellings (-or/-our, -ize/-ise, -er/-re), double 'l' variations, and vocabulary differences while preserving casing.
Check banners, presentations, contracts, and PDFs
Upload graphics or office docs to highlight spelling mistakes right over the visual layout.
Key Differences Between American & British English
American and British spelling divergence was largely popularized by lexicographer Noah Webster in 1828 to simplify English spelling phonetically.
Color ↔ Colour
American English drops the 'u' from Latinate words ending in -our.
UK: honour, labour, harbour
Organize ↔ Organise
US English uses -ize exclusively, whereas British English traditionally favors -ise for verbs derived from Greek.
UK: realise, prioritise, analyse
Center ↔ Centre
Words borrowed from French ending in -re were phoneticized in US English to end in -er.
UK: theatre, metre, fibre
Defense ↔ Defence
US English spells noun forms with an 's' (defense, offense), while British English preserves the 'c'.
UK: licence, pretence
Traveled ↔ Travelled
When adding suffixes to verbs ending in a single 'l', British English doubles the 'l' regardless of stress, whereas American English keeps a single 'l' unless stressed.
UK: cancelling, signalling
Apartment ↔ Flat
Entirely different words are used for common objects, transport, food, and clothing between American and British dialects.
UK: lift, biscuit, boot, pavement