How to Improve Your Writing with AI: Grammar, Clarity, Tone and Style

For improving text in Spanish or English, these are the best free options to start with today:

Tool	Best for	Price
Claude (claude.ai)	Rewriting, adjusting tone, explaining why something sounds off	Free (with limits)
ChatGPT (chatgpt.com)	Correction, style variations, creative writing	Free / $20/mo (Plus)
Grammarly (grammarly.com)	Automatic correction inside documents and the browser	Free / $12/mo (Pro annual)
LanguageTool (languagetool.org)	Free alternative to Grammarly with good Spanish support	Free

Recommended starting point: open claude.ai or chatgpt.com, both are free and you don’t need to install anything. If you want automatic correction while writing in Google Docs or Gmail, add Grammarly or LanguageTool later.

Confirm prices on the official page before paying (they may change).

The quality of the result depends on what you ask. Use these proven prompts:

To fix grammar and clarity:

Review this text and fix it: grammar errors, confusing sentences or unnecessary words. Keep my voice and don't change the meaning.

[paste your text here]

To make it more concise:

This text is too long. Shorten it by half without losing the main ideas.

[paste your text here]

To change the tone:

Rewrite this text in a more professional tone (or friendlier, or more direct). Don't change the content.

[paste your text here]

The golden rule: always tell it what you want to change AND what you want to keep. The more specific you are, the better the result.

AI can adapt the same text to different contexts. Try these instructions based on what you need:

• More formal: “Rewrite in formal tone for a corporate report.”
• More casual: “Make it more conversational, like writing to a colleague.”
• More direct: “Remove filler phrases and get to the point.”
• Less aggressive: “Soften the tone without losing the main message.”

If you have your own style you want to preserve, give it as a reference:

Here's an example of how I normally write:

[paste a paragraph of yours that you like]

Now rewrite this other text with the same tone and style:

[paste the text you want to improve]

Never copy and paste the AI’s response without reading it first. Use this quick checklist:

• Is the meaning the same as the original?
• Are there words I would never use?
• Is the tone what I asked for?
• Are there phrases that sound too polished or artificial?

Change whatever doesn’t feel right. The AI gives you an improved draft; you give it the final touch that makes it yours.

Tip: if you don’t like the result, write “Try again, but with fewer embellishments” or “The tone is too formal, make it more natural.” AIs take feedback very well.

If you write a lot in Google Docs, Gmail, Word or the browser, Grammarly is a very practical addition: it reviews automatically as you type, without needing to copy and paste.

1. Go to https://grammarly.com and create a free account.
2. Install the Chrome extension or the desktop app (Mac/Windows).
3. Open your document and Grammarly will underline errors and suggestions in real time.

The Pro plan (from $12/mo billed annually, confirm at grammarly.com/plans) adds tone suggestions, plagiarism detection and more advanced rewrites.

For texts in Spanish, LanguageTool (languagetool.org) is a very solid free alternative.

Try this right now to see the difference:

1. Open claude.ai or chatgpt.com and sign in (a free account is enough).
2. Paste this prompt and replace the text in brackets with a real email or paragraph of yours:

I have this text I want to improve. Make it clearer and more concise without changing the message or language:

[paste your text here]

3. Read the result, edit whatever doesn’t feel right, and copy it where you need it.

In less than 2 minutes you have more professional text. To go deeper, these tutorials will help:

• How to write professional emails with ChatGPT
• How to use ChatGPT for writing

Problem	Fix
The AI changed the meaning of the text	Say: “Don’t change the meaning, only improve grammar and clarity”
The result sounds too artificial or generic	Ask: “Make it more natural and conversational, less formal”
I lost my original style	Add an example of how you write and ask it to match that tone
It keeps responding in English	Specify: “Please respond in Spanish”
Grammarly suggestions appear in English	Change the document language in Grammarly’s settings