How to Use Grammarly Generative AI for Rewriting and Tone Adjustment

Grammarly generative AI helps you rewrite sentences and adjust tone when inline underlines are not enough. You highlight a selection, choose a suggested prompt or type your own instruction, then insert a rewrite that should keep your meaning. Full sentence rewrites and tone adjustment appear as Pro capabilities on official plans pages, while Free includes a smaller monthly generative AI prompt allotment. Confirm live details at grammarly.com/plans and start with the product map at /explore/grammarly.

This guide shows a rewrite workflow you can reuse for email, chat, and documents. Pair it with inline habits at /blog/how-to-use-grammarly-for-inline-writing-assistance and with Paraphraser style work at /blog/how-to-use-the-grammarly-paraphraser-agent-for-writing-styles. Prompt limits listed on plans pages include about 100 generative AI prompts per month on Free, about 2,000 prompts per member per month on Pro, and unlimited prompts on Enterprise.

When to use generative rewrite

Use generative rewrite when a sentence is correct but wrong for the audience, when you need shorter text, or when tone must shift from casual to formal. Skip it for tiny spelling fixes that inline red underlines already solve. Also skip whole document rewrites in one highlight. Paragraph level selections keep meaning easier to verify.

Pro pricing is listed around $12 per member per month when billed annually, with a higher monthly price shown as $30 on plans pages. Features and prices can vary by region and time, so treat these figures as orientation only and verify at grammarly.com/plans.

How rewrite prompts work

Strong rewrite prompts name the change, the constraints, and the facts that must stay. Weak prompts say make this better and invite drift. After you insert a rewrite, run an inline review again so new grammar issues do not slip through. If you need natural sounding polish on AI assisted drafts inside Docs, continue with Humanizer later.

Step by step rewrite workflow

1. Select one paragraph or a short block

Highlight the muddy part only. Large selections hide which sentences changed. If the document is long, rewrite in passes from top to bottom and keep a protected string list open beside you.

Selection rule
Max scope: one paragraph or up to 80 words
If longer: split into two rewrites
Always keep: names, numbers, URLs, legal phrases
After insert: re-check protected strings

2. Write a constraint first prompt

Lead with the outcome, then list must keep lines. Ask for length when brevity matters. Ask for formality when audience matters. One clear instruction beats a long mood essay.

Rewrite prompt
Make this more formal and specific.
Keep every number and product name.
Keep the ask for approval by Friday.
Limit to 60 words.
Do not add new benefits or claims.

3. Insert, compare, then rephrase if needed

Compare the rewrite to your original side by side. If tone is close but not right, use a rephrase style follow up on the same selection instead of restarting from a vague prompt.

Compare checklist
[ ] Meaning matches original intent
[ ] Protected strings intact
[ ] Tone matches goal card
[ ] Length within limit
[ ] No new claims added
If fail: Rephrase with a tighter constraint

4. Adjust tone with explicit labels

Name the tone you want: formal, friendly, confident, apologetic, or plain. One label beats mixed instructions. If you use a saved voice feature when offered, still verify facts after insert.

Tone labels that work well
formal executive
friendly support
direct internal
apologetic customer recovery
plain language public help center

5. Spend prompts on high leverage lines

Free allotments are limited. Spend prompts on subject lines, asks, and openings. Use inline underlines for simple grammar. Track prompt use if your team shares a Pro seat budget across many writers.

Prompt budget note
Plan check: grammarly.com/plans
Free signal: 100 generative AI prompts per month
Pro signal: 2,000 prompts per member per month
Enterprise signal: unlimited prompts
Team rule: rewrite asks and openings first

Copyable rewrite prompts and samples

Paste the sample text, highlight it, then run the matching prompt. Keep the protect lines unchanged. These cover email, Slack, blog, sales, and help center jobs.

Shorten a rambling update

Original
I was just writing to kind of let you know that we are still waiting on the design files and that maybe we can meet tomorrow if you are free or the next day if that is better for you and the team.

Prompt
Shorten to 35 words. Keep the request to meet. Offer tomorrow or the next day. Formality: professional friendly.

Harden a soft ask

Original
Whenever you get a chance, it would be great if you could look at the budget when you can.

Prompt
Make the ask clear and polite. Request a review by Thursday 3pm. Keep the word budget. Under 40 words.

Customer apology without over promising

Original
We are so incredibly sorry for this huge mess and we will do whatever it takes to make it right immediately.

Prompt
Rewrite as a calm apology. Admit the delay. Offer a concrete next update in 24 hours. Do not promise refunds or credits. Keep under 55 words.

Executive status tone

Original
Things are moving along and we feel pretty good about launch even though a few items are still open.

Prompt
Rewrite for an executive reader. State status, top risk, and one decision needed. Keep launch as the milestone word. Max 50 words.

Friendly Slack without slang drift

Original
lol this bug is wild, customers are gonna hate it, we should maybe hotfix today???

Prompt
Rewrite as a clear Slack message for #eng. State the bug impact, propose a hotfix today, ask for an owner. No slang. Under 45 words.

Blog paragraph clarity

Original
There are a number of different ways that someone could potentially go about improving their writing process with assistance from software tools that provide suggestions.

Prompt
Make this plain and concrete. Mention Grammarly inline suggestions as one example. Keep under 40 words. Do not invent statistics.

Subject line rewrite set

Original subject
Touching base about stuff from earlier

Prompt
Write 5 subject lines. Each under 8 words. Include the topic budget approval. Tone: direct. No clickbait.

Fact protection rewrite

Original
Our Pro plan is cheap and gives tons of AI prompts every month for teams.

Prompt
Rewrite accurately. Keep these facts only if present in source notes:
Pro about $12 per member per month billed annually
About 2,000 generative AI prompts per member per month
Point readers to grammarly.com/plans for current figures
Do not invent other quotas.

Formal to plain language

Original
Kindly be advised that utilization of the conference room necessitates prior reservation via the internal portal.

Prompt
Rewrite in plain language for all staff. Keep the rule that reservations go through the internal portal. Under 30 words.

Before and after instruction pair

Before text
We might be able to deliver the report next week or so depending on review.

After goal
Commit to Wednesday delivery unless legal blocks it. Say who owns the blocker.

Prompt
Rewrite to match the after goal. Keep Wednesday. Name Legal as the only allowed blocker. Under 45 words.

Sales follow up tone

Original
Just checking in to see if you had any thoughts or wanted to move forward or not whenever.

Prompt
Rewrite as a concise sales follow up. Reference the trial end date 3 September. Offer a 20 minute call. No pressure language. Under 55 words.

Internal critique that stays kind

Original
This draft is confusing and kind of a mess and I do not think stakeholders will get it.

Prompt
Rewrite as constructive feedback. Name two concrete issues: missing decision and unclear owner. Keep a respectful tone. Under 50 words.

Help center step intro

Original
In order to proceed with resetting your password you will want to commence by clicking the link.

Prompt
Rewrite for a help center. Imperative voice. One sentence. Keep the action click the link. Plain language.

Tips and verification

After every insert, scan for new claims. Generative rewrite can smooth language while inventing certainty. If you need style variety with meaning preserved inside Docs, see the Paraphraser guide. If AI drafted text sounds stiff, see Humanizer. Keep prompt spend intentional on Free and Pro allotments listed at grammarly.com/plans.

• Rewrite paragraph by paragraph, not whole documents in one highlight
• Name tone and length in the prompt
• Re run inline review after inserts
• Verify prices and limits at grammarly.com/plans before publishing plan claims
• Escalate stiff AI drafts to Humanizer when you work in Docs

Common mistakes

• Highlighting an entire document and hoping meaning survives
• Using make this better with no tone, length, or fact constraints
• Inserting rewrites without checking protected names and numbers
• Spending Free prompts on tiny spelling issues inline tools already catch
• Publishing plan prices without pointing to grammarly.com/plans
• Treating generative rewrite as a fact checker
• Skipping a second inline pass after a tone shift

Related articles: /blog/how-to-use-grammarly-for-inline-writing-assistance, /blog/how-to-use-the-grammarly-paraphraser-agent-for-writing-styles, and /blog/how-to-use-grammarly-humanizer-for-natural-sounding-ai-drafts. Overview: /explore/grammarly.