AI Text Rewriter

Paste your text

An email, a product description, a paragraph from a report, a social post. Up to 2,500 characters on this page, any length inside Krater.

Choose mode and tone

Paraphrase, simplify, make formal or casual, shorten, expand or fix grammar. Then pick the tone the reader should feel.

Copy the rewrite

The meaning stays, the wording improves. Copy it, or continue inside Krater to rewrite with a different model or in another language.

Simplify a customer notice

Quick update: your order is running a little late. We are sorry about that and will ship it as soon as we can.

Original: Simplify, friendly: We are writing to inform you that due to unforeseen circumstances your order has been delayed and will be shipped at the earliest possible convenience.

Make a chat message formal

Hello, could you please resend the invoice? The first version listed an incorrect address. Thank you for your help.

Original: Make formal, professional: hey, can u send the invoice again? the first one had the wrong address on it, thx

Shorten a product description

Stainless steel bottle that keeps drinks cold for 24 hours and hot for 12. Fits any cup holder or backpack pocket.

Original: Shorten, confident: Our brand new water bottle is made from high quality stainless steel that keeps your drinks cold for up to 24 hours and hot for up to 12 hours, and it fits in most car cup holders and backpack pockets.

Expand a bullet point

We reduced onboarding time by 40% by replacing the manual setup checklist with guided in-app steps and templates. New customers now reach their first result on day one instead of the end of the first week, which has lifted activation and cut support tickets during the first month.

Original: Expand, professional: Reduced onboarding time by 40%.

Fix grammar

They are going to review the proposal tomorrow, so we should send the final version tonight and make sure it does not have any errors.

Original: Fix grammar, neutral: Their going to review the proposal tomorrow, so we should sent the final version tonight and make sure it dont have any error.

Paraphrase a headline

Stop juggling AI subscriptions: run every model from one workspace and get your hours back.

Original: Paraphrase, persuasive: Save time by managing all your AI tools in one place.

Paraphrase

Same meaning, new wording and sentence structure. Use it to avoid repetition, freshen a headline or reword borrowed text in your own voice.

Simplify

Shorter sentences, plain words, no jargon. Use it for customer facing text, instructions and anything read on a phone.

Formal and casual

Shift the register without changing the content. Formal for clients, legal and official mail; casual for social, community and internal chat.

Shorten, expand, fix grammar

Shorten cuts filler while keeping every fact. Expand adds context and examples to a thin draft. Fix grammar corrects spelling, punctuation and agreement and touches nothing else.

Customer emails and replies

Turn quick internal notes into polite, clear messages customers are happy to receive.

Product descriptions

Shorten, sharpen and reword listings so each product reads differently and converts.

Website and landing copy

Paraphrase headlines and sections for tests, or simplify pages that read like a manual.

Reports and proposals

Make dense paragraphs readable and formalise drafts before they reach a client.

Social posts and ads

Generate variations of the same message in different tones for every channel.

Non native writing

Fix grammar and idiom so text written in a second language reads naturally.

Small businesses

Send professional emails, notices and descriptions without a copywriter on staff.

Ecommerce and marketing teams

Rewrite listings, ads and campaign copy in every tone and keep the brand voice consistent.

Sales and support

Turn rough notes into clear, confident replies in seconds.

Agencies and freelancers

Adapt one piece of copy to each client's register without starting over.

Founders and managers

Make updates, proposals and announcements read as well as they think.

Students and non native writers

Fix grammar and simplify complex text while learning how it should read.

Every writing model

GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral and more. Rewrite the same text with two models and keep the better one.

Whole documents

Upload a document, rewrite sections or the entire file, and export it, with no character limit.

Your text stays yours

Your text is used only to produce your rewrite. Inside Krater everything you write is stored in your own workspace.

Rewrite, translate, humanize

Continue in the same chat: translate the rewrite, humanize AI sounding text, summarise it or turn it into an email.

What is an AI text rewriter?

A tool that takes text you already have and rewrites it while keeping the meaning: paraphrased, simplified, more formal or casual, shorter, longer, or with grammar fixed. It replaces manual rewording and proofreading for everyday business text.

How do I rewrite text with AI for free?

Paste your text at the top of this page, pick a rewrite mode and a tone, and click Rewrite text. The rewrite appears in seconds with a copy button. One run is free with no account.

Will the rewrite keep my meaning?

Yes. The model is instructed to preserve facts, names, numbers and intent and to change only the wording, structure and tone you asked for. Fix grammar mode changes nothing but the errors.

What is the difference between paraphrase and simplify?

Paraphrase rewords the text at the same level of complexity, useful for variation and originality. Simplify rewrites it in shorter sentences and plainer words so it is easier to read.

Can it rewrite text in other languages?

Yes. Paste text in any major language and the rewrite comes back in the same language. Inside Krater you can also translate while rewriting.

How long can the text be?

Up to 2,500 characters on this free page, which is roughly a long email or a few paragraphs. Inside Krater there is no character limit and you can work on whole documents.

Which AI model does the rewriting?

The free run uses Gemini Flash. Inside Krater you can rewrite with GPT-5, Claude, Gemini Pro, Grok, DeepSeek, Mistral and more, and compare results side by side.

Is rewritten text detectable as AI written?

A rewrite of your own text keeps your ideas and structure, so it reads like you. If you need text to sound more human, Krater also includes an AI humanizer you can run on the result.

Do I need an account?

No. The free run is verified automatically with no sign-up. Get Started on Krater when you want unlimited rewrites, every model and documents.

What happens to my text?

Your text is used only to produce your rewrite and is not used to train models. Inside Krater everything you write is stored in your own workspace under your control.