Grammar checker for British and American English

Catch spelling, grammar, punctuation and word-choice mistakes, with each fix highlighted in your text and explained in one sentence. Accept fixes one by one or all at once.

Try the Grammar Checker freeSee plans

Free plan available. No card required.

Why use the TextLumi Grammar Checker

Fixed in place

Each issue is underlined exactly where it appears; accept or dismiss it with one click.

UK or US conventions

Switch between British (colour, organise) and American (color, organize) English.

Explains every change

Learn why something is wrong, not just what to change.

Tone and readability

See your overall tone, a writing score and readability statistics.

How to use it

  1. 01

    Paste or upload your writing.

  2. 02

    Choose British or American English.

  3. 03

    Accept the fixes you want and copy the corrected text.

Grammar Checker FAQs

Does it support British English?

Yes. British English is the default, and you can switch to American English at any time.

Will it rewrite my style?

No. It's tuned to flag genuine errors and leave correct writing alone, even when it's not how the tool would phrase it.

Is the grammar checker free?

The free plan includes a monthly allowance with no card required.

Can it check long documents?

Yes, up to about 30,000 characters at a time, and you can upload .docx, .pdf or .txt files.

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