Proofread and grammar-check right where you type

How it works

1. Type in Gmail, Messenger, or any form.
2. Proofread Bot underlines grammar and spelling issues.
3. Accept the fix or ignore it in place.

Proofread everywhere

Browser extension

Check the focused field. Right-click or Alt+Shift+P. Orange underlines, Accept or Ignore.

Chrome Firefox Edge

Google Docs

Proofread inside Google Docs with the separate add-on. The Chrome extension does not run in Docs.

Get Docs add-on

Standalone editor

Paste or write at /app for a focused grammar, spelling, and proofreading workspace.

Web editor Android iOS

Writing tips

Practical guidance for clearer, more confident writing.

• How to Proofread Your Own Writing

  Catching your own mistakes is hard because your brain reads what you meant, not what is on the page. Five techniques that actually work.

• Proofreading vs. Editing: What's the Difference?

  People use proofread and edit as if they mean the same thing. They don't. Here is how to tell which stage your writing is at.

• How to Proofread in Microsoft Word

  A practical walkthrough of Word's built-in Editor, spelling and grammar checks, and Read Aloud — plus where they fall short.

• How to Proofread a Resume and Cover Letter

  A single typo can cost you an interview. A practical checklist before you hit submit.

• Common English Grammar Mistakes for Non-Native Speakers

  Articles, prepositions, and verb tenses trip up even advanced learners. Here is how to catch them.

• How to Proofread a Manuscript

  Proofreading 300 pages is a different job than proofreading a page 300 times. Here is how to approach it.

• Their, There, They're: 30 Real Mistakes and How to Fix Them

  Real sentences people sent to Proofread Bot, sorted by which of the three words they mixed up, with formal corrections and a quick test for each.

• To, Too, Two: 30 Real Mistakes and How to Fix Them

  Real sentences from Proofread Bot users that confuse to, too and two, grouped by the type of error, with formal corrections and a simple test for each.

• Then vs. Than: Real Mistakes and How to Fix Them

  Real sentences from Proofread Bot users that confuse then and than, with formal corrections and the comparison errors that tend to accompany them.

• Your or You're? 16 Real Mistakes and How to Fix Them

  Your shows possession; you're means "you are." Real examples from Proofread Bot users, with formal corrections and a one-step test.

• Its or It's? Real Mistakes and How to Fix Them

  Its is possessive; it's means "it is" or "it has." Real examples from Proofread Bot users, with formal corrections.

• Me or I? "My Friend and I" vs. "Me and My Friend" (18 Real Examples)

  When to use I, me, and myself, with real mistakes from Proofread Bot users and a simple test that works every time.

• "Me Asking" or "My Asking"? The Possessive Before a Gerund

  In formal and academic writing, a pronoun or noun before an -ing noun takes the possessive form. Real examples and when the rule applies.

• Who, Whom, Which, or That? Real Mistakes and How to Fix Them

  Who refers to people, that and which to things; whom is the object form. Real examples from Proofread Bot users with formal corrections.

• Though, Through, or Thought? 10 Real Mistakes and How to Fix Them

  Though means "although," through means "from one side to the other," and thought is the past of think. Real examples from Proofread Bot users.

• Commonly Confused Words: 18 Real Mistakes and How to Fix Them

  Affect or effect, weather or whether, a lot or alot, loan or borrow: real word mix-ups from Proofread Bot users, with formal corrections.

• Good or Well? Real Mistakes and How to Fix Them

  Good is an adjective; well is an adverb (and also means "healthy"). Real examples from Proofread Bot users, including the tricky "tastes good."

• Is or Are? 31 Real Subject–Verb Agreement Mistakes

  A singular subject takes a singular verb; a plural subject takes a plural verb. Real examples from Proofread Bot users, including the tricky cases.

• Childrens, Mouses, Fishes: 18 Real Plural Mistakes

  Irregular plurals, uncountable nouns, and apostrophes in plurals: real mistakes from Proofread Bot users with formal corrections.

• Goed, Eated, Runned: 20 Real Irregular Verb Mistakes

  The past tense of go, eat, run, see, teach and other irregular verbs, with real mistakes from Proofread Bot users and formal corrections.

• Verb Tense Mistakes: 23 Real Examples and How to Fix Them

  Mixing past and present, using the present perfect with "yesterday," and other real tense errors from Proofread Bot users, with formal corrections.

• "If I Would Have…": 16 Real Conditional Sentence Mistakes

  Do not put will or would in the if-clause. Real examples of first and second conditional mistakes from Proofread Bot users, with corrections.

• "Where the Hotel Is?": 20 Real Question Word Order Mistakes

  Questions in English need a helping verb before the subject. Real mistakes from Proofread Bot users, including indirect questions, with corrections.

• Much or Many? Less or Fewer? 17 Real Countable Noun Mistakes

  Informations, advices, luggages: real mistakes with uncountable nouns from Proofread Bot users, plus when to use much, many, less and fewer.

• A, An, or The? 16 Real Article Mistakes and How to Fix Them

  A before consonant sounds, an before vowel sounds, and when to use the: real article mistakes from Proofread Bot users, with corrections.

• "More Better" and "Most Biggest": 17 Real Comparison Mistakes

  Double comparatives, incomplete comparisons, and illogical comparisons: real mistakes from Proofread Bot users, with formal corrections.

• Can You Use Contractions in Academic Writing? 23 Real Examples

  Short answer: avoid them. Real examples of contractions and informal forms from Proofread Bot users, with the formal version of each.

• Apostrophe Mistakes: 20 Real Examples and How to Fix Them

  Possessives, plurals, and contractions: real apostrophe mistakes from Proofread Bot users, including plural possessives like "five years' experience."

• Comma Mistakes: 35 Real Examples and How to Fix Them

  Introductory phrases, lists, compound sentences, and commas that do not belong: real comma mistakes from Proofread Bot users, with corrections.

• Punctuation with Quotation Marks and Citations: 17 Real Examples

  Where commas, periods, question marks and semicolons go with quotation marks and parenthetical citations, with real examples and formal corrections.

• Capitalization Mistakes: 24 Real Examples and How to Fix Them

  Names, places, days, nationalities, the pronoun I, and words that should not be capitalized: real mistakes from Proofread Bot users.

• Redundant Words in Academic Writing: 23 Real Examples

  "Same exact," "where at," "the ability to be able," and repeated words: real redundancies from Proofread Bot users, with concise corrections.

• Parallel Structure Mistakes: 12 Real Examples and How to Fix Them

  Items in a list or pair should share the same grammatical form. Real faulty parallelism from Proofread Bot users, with formal corrections.

• Gerund or Infinitive? 16 Real Mistakes with "To" and "-ing"

  "Decided going," "suggested me to," "must to buy," "wants to sends": real verb pattern mistakes from Proofread Bot users, with corrections.

• Preposition Mistakes: 16 Real Examples and How to Fix Them

  In, on, at, to, and unnecessary prepositions: real preposition mistakes from Proofread Bot users, with formal corrections.

Free online proofreading tools

Check your text, a web page or your CV in seconds, no install needed.

• Proofread my text online
• Proofread a website
• Proofread my CV
• Free grammar checker
• AI proofreading

Grammar rules, explained

Short guides to the mistakes Proofread Bot flags most, with examples and fixes.

• Comma splices
• Run-on sentences
• Passive voice
• That vs. which
• Either is or either are?
• Ending a sentence with a preposition
• Hyphenating compound modifiers
• Double negatives
• All grammar rules →

Frequently asked questions

Open web editor See pricing