Punctuation Checker
Find and fix common punctuation and spacing mistakes in your writing instantly.
What this punctuation checker catches
- Double spaces and spaces before commas or full stops
- Missing spaces after commas, colons and full stops
- Sentences and lines that start with a lowercase letter
- The pronoun “i” written in lowercase
- Repeated words such as “the the”
- Repeated !!! or ??? and missing end punctuation
It runs entirely in your browser – your text is never uploaded.
Quick punctuation rules
Commas separate items in a list and join clauses with “and”, “but” or “so”. Semicolons join two complete sentences that are closely related. Apostrophes show possession (the dog’s bone) or missing letters (it’s = it is).
This is a rule-based checker for common mistakes. It does not understand grammar or meaning, so always read your text through.
Frequently asked questions
Is my text saved?
No. Everything runs in your browser.
Does it check grammar and spelling?
It focuses on punctuation and spacing. Use your word processor’s spell checker for spelling.
Last updated 15 November 2026. Results are estimates for general information and are not financial, tax, legal or medical advice.
