A guided walkthrough of the writing studio, from engine loading to a reviewed draft.
01
Paste or type your draft
Drop a draft into the writing studio. The routine grammar check runs in your browser after the Harper engine has downloaded and initialized. The status beside the editor distinguishes engine loading, checking, a completed clean result, issues, and a failed check.
You can paste an email, a paragraph, an essay, or a report. Browser memory and device performance vary, so for long documents work section by section and review each suggestion in context before moving to the next paragraph.
02
Review each suggestion individually
Each issue shows the flagged word or phrase, the suggested correction, and a single-line reason in plain English. Read the reason before accepting the change. Grammar suggestions are not always right for your specific sentence — the checker does not know your audience, your company style guide, or the exact register you are writing in.
Use Apply to accept a correction. The editor then discards every suggestion that belonged to the older draft and checks the new revision again, so another old range cannot change the wrong text. Use Dismiss if the original wording fits your context better. Dismissing a suggestion removes that flag from the current revision.
A practical workflow is to inspect the surrounding sentence even for an apparently mechanical correction, then give extra scrutiny to sentence structure, passive voice, and word choice. A name, quotation, technical term, or deliberate style choice may look unusual without being wrong.
03
Apply or dismiss each flag
Use Apply when the suggestion preserves your meaning. Use Dismiss when a name, quotation, technical term, or deliberate style choice should remain unchanged. The checker never changes the entire draft automatically.
Context still belongs to the writer. A grammar engine can recognize common patterns, but it cannot know every audience, house style, legal meaning, or specialized term. Review the sentence around each flag before accepting it.
04
Copy the reviewed draft
After reviewing the issues, use Copy to move the checked draft back into your email, document, or publishing tool. Use Clear when you are ready to start a different draft.
For long documents, repeat the process section by section. Smaller sections keep each suggestion close to its context and make final review easier.
What it catches
Built for the errors that matter.
Spelling, grammar, punctuation, and style — each explained in a single line so you understand the fix, not just apply it.
Spelling
Typos, doubled letters, and high-frequency misspellings like "recieve" or "definately" caught before they reach your reader.
Grammar
Harper rules can flag some agreement, tense, pronoun, and sentence-boundary patterns and show a plain-English reason for each displayed issue.
Punctuation
Missing commas, wrong apostrophes, stray spaces before punctuation, and unbalanced quotation marks.
Style
Wordy phrases, redundancy, and passive constructions where active reads better — so your writing is tighter, not just correct.
By document type
The checker works differently for each writing context.
Same tool, different priorities — here is how to get the most from it depending on what you are writing.
Professional emails
Run the grammar check before sending any email to a client, manager, or new contact. Pay particular attention to subject-verb agreement flags, apostrophe corrections, repeated words, and commonly confused terms. Read the full sentence again after each applied fix to confirm the tone and meaning still fit.
Academic essays and papers
Grammar check the full essay after drafting, not during. Checking mid-draft interrupts the writing flow and surfaces issues that may disappear during revision. After drafting, run the check, apply the clear mechanical corrections, and then review the sentence-level suggestions individually — academic writing has specific conventions around passive voice and formal vocabulary that differ from what a general grammar check expects. Use the grammar guides linked from suggestions to understand the underlying rule, not just accept the correction.
Reports and proposals
Work section by section in long documents. Paste each section separately, resolve the flags, then copy the corrected text back into your document. This produces a more useful review than pasting a full 3,000-word report at once because each correction stays close to its local context.
Social content and web copy
Short-form content has less tolerance for mechanical errors because each sentence carries more weight. Run the check on headlines and opening lines first, then review punctuation and commonly confused words before publishing. Treat style flags as prompts to reread, not automatic commands.
Understanding suggestions
Not every flag is a definitive correction.
Grammar is context-dependent. Here is how to read what the checker is telling you.
Spelling and repeated words
Spelling and repeated-word flags are often mechanical, but still inspect names, quotations, technical terms, and deliberate repetition before applying a change.
Subject-verb agreement
Usually correct, but read the sentence before accepting. Some agreement flags involve collective nouns or complex sentence structures where the rule depends on whether you are treating a group as singular or plural. The linked grammar guide explains how to decide. If the sentence is unambiguously wrong, accept the correction. If it involves a deliberate stylistic choice, dismiss the flag.
Confused word pairs
Flags for confused pairs like affect/effect, its/it's, or their/there/they're are worth checking individually. The checker identifies these based on the word form present, but context determines which form is correct. Open the linked guide, read the decision rule, and verify that your intended meaning matches the suggested correction before applying it.
Style suggestions
Passive voice flags, wordiness suggestions, and sentence structure notes are the most context-dependent category. Passive voice is correct in scientific writing, formal legal text, and anywhere the actor is less important than the action. Dismiss style flags when the original wording was intentional and fits the audience. Accept them when the sentence is genuinely harder to read than it needs to be.
Grammar guides
When to read the guide instead of just applying the fix.
The checker fixes the sentence. The guide explains the rule so the same mistake does not appear in the next draft.
Recurring errors
If the same type of flag appears more than twice in a draft — multiple comma suggestions, several apostrophe corrections, repeated confused-word flags — read the corresponding grammar guide rather than applying the corrections one by one. Understanding the rule is faster than fixing the same mistake in ten places. The Learn section is organized by topic and each guide includes the decision rule, the most common mistake, and the exceptions.
Suggestions you disagree with
When a suggestion looks wrong for your sentence, the guide explains why the checker flagged it. If the guide confirms the checker is right and you are looking at an exception, you will understand the exception clearly enough to dismiss the flag with confidence. If the guide confirms your instinct, dismiss the flag and keep your original wording.
Rules you want to learn
The most efficient way to improve grammar over time is to read one guide per week on a rule you apply regularly but are not completely confident about. Good starting points: comma rules, subject-verb agreement, its vs. it's, affect vs. effect, and active vs. passive voice. Each takes about five minutes to read and applies to writing in nearly every context.
Before important submissions
Before a job application, client proposal, or academic submission, use the checker as one review pass and separately inspect the rules you know you apply inconsistently. High-stakes text still needs an appropriately qualified reviewer.