The Best Multilingual AI-Powered Writing and Editing Tools for Translators, Proofreaders and Language Professionals

What if the best editing tool you never knew about was in the palm of your hand?

If you've been thinking about tapping into artificial intelligence (AI) to help you write copy, polish emails, or edit translations, you're in luck. Today's tools are far more capable — and far more multilingual — than the first generation of AI writing assistants.

In this blog post — based on our techforword insiders webinar on AI writing assistants — we'll explore how to use these tools to:

·  Fix your spelling and grammar

·  Find synonyms, rephrase sentences, and improve your writing

·  Write, edit, and adapt texts in multiple languages

·  Choose between dedicated writing assistants and general-purpose AI tools

Ready to improve your writing? Read on!

Spelling and grammar checkers

As language experts, we frequently write in non-native languages — whether we're sending a quote to a client, penning a note to a colleague, or writing blog or social media posts.

Spelling and grammar errors can shoot us in the foot, damage our professional image, and even influence whether we land a job.

That's why having a solid spelling and grammar checker that covers your working languages is essential for language professionals.

Although spellcheckers are built into most word processors, we're big fans of multilingual tools that work across a range of software — including right inside your browser, email, and word processor.

The landscape has changed here. ProWritingAid is still English-only, but Grammarly now supports real-time writing suggestions in more than 20 languages. That makes Grammarly much more relevant for multilingual professionals than it used to be.

LanguageTool remains one of our favorite multilingual options. The freemium tool supports 30+ languages and dialects, automatically detects many languages, and works in browsers, desktop apps, email, and popular word processors. Depending on the language and plan, it can go beyond basic spelling and grammar to offer style suggestions, synonyms, and AI-assisted rewrites.

Check out our full review of LanguageTool!

If you regularly work in several languages, it's worth trying both Grammarly and LanguageTool to see which one gives you the strongest coverage for your particular language combination and workflow.

Use a multilingual grammar checker that works across browsers, email, and word processors.

A brief introduction to generative AI and large language models

The first version of this article talked about GPT-3. That model helped kick-start the current wave of generative AI, but the technology has moved on dramatically.

Today's large language models, or LLMs, can do much more than predict the next few words in a sentence. Give them clear instructions and they can draft, edit, summarize, translate, compare versions, change tone, explain grammar choices, and work with longer documents across many languages.

Tools such as ChatGPT, Gemini, and Claude have also blurred the line between a grammar checker, a paraphrasing tool, and an AI copywriter. One general-purpose assistant can now handle many of those tasks in a single conversation.

That doesn't make dedicated writing tools obsolete. Inline assistants such as LanguageTool and Grammarly are still extremely handy when you want continuous corrections while you write. General-purpose AI assistants come into their own when you want to give more detailed instructions about meaning, audience, terminology, register, or style.

Let's dive into some ways language professionals can use today's AI-supported writing tools!

Finish your sentences with Google’s Smart Compose 

Email can be the bane of our existence. What if we had a tool that would learn to complete our emails based on our style?

Enter Smart Compose. Built into Gmail, it predicts and completes text as you write. It currently supports English, Spanish, French, Italian, and Portuguese.

Smart Compose is useful for speeding up short, predictable messages, but it's much more limited than today's generative AI tools. Think of it as a lightweight autocomplete assistant rather than a full writing partner.

Speed up emails with Google Smart Compose, which predicts and completes your sentences.

To learn more about how to use write faster and smarter and take the overwhelm out of email, check out our Tame Your Email Monster challenge.

Rewrite and improve text with AI

Imagine your AI buddy reading your copy — and helping you rewrite it.

That idea is no longer limited to specialist paraphrasing tools. Today, both dedicated writing assistants and general-purpose AI tools can suggest alternatives for a sentence, paragraph, or entire document.

Start with a dedicated writing assistant

If your main goal is to improve text as you type, a tool such as LanguageTool or Grammarly is often the easiest option. They can flag errors inline and, in supported languages, suggest clearer or more natural alternatives without forcing you to leave the app you're working in.

This is especially useful for emails, website copy, social posts, and other everyday writing where you want quick feedback rather than a full AI conversation.

Tidy up text with the Neural Text Improving App

Interpreting technology researcher Claudio Fantinuoli - the mastermind behind InterpretBank - recently released an experimental “neural text improving app.” Available in English, French, German, Spanish, and Italian, it will correct grammar errors and rephrase sentences. Why not take it for a spin for free?

Fix grammar and rephrase sentences with a multilingual neural text improvement app.

Tune up your prose with Wordtune

Wordtune is still a useful option for rewriting and polishing English. Select a sentence or paragraph and it can offer alternative wording, shorten or expand text, adjust tone, and help improve fluency.

Its multilingual input options have expanded, but its core rewriting experience is still centered on English output. That makes it useful if you draft in another language and want help producing polished English, but less versatile for multilingual rewriting than some newer tools.

Because features and plan limits change frequently, we'd avoid choosing a tool based on a fixed price or rewrite quota. Test the free tier and make sure the languages and integrations you need are actually covered.

Use Wordtune to instantly rewrite and improve your sentences with AI-powered suggestions.

Rewrite longer content with Writesonic

Writesonic still supports multilingual writing and rewriting, but it has grown into a much broader content and marketing platform.

Instead of thinking of it simply as a paragraph rewriter, think of it as a specialist content-production tool. It can help with longer-form marketing content, articles, SEO-oriented workflows, and other structured copywriting tasks.

For translators and interpreters, that may be useful if marketing is a big part of your business. For occasional rewriting, however, a general-purpose AI assistant may be simpler.

Rephrase full paragraphs in many languages with Writesonic's AI content generator.

Generate texts with AI assistants

From articles to blog posts and emails to sales copy, AI copywriters can dish up copy in a vast array of genres and styles.

Simply pick the type of writing, language and tone and let the machine do the rest!

Popular multilingual options include Writesonic (24 languages, $15+/month), Jasper (26 languages, $29+/month), Copy.ai (25+ languages, $35/month), and Rytr (34 languages, 5K characters free, then $9/month).

Our favorite, Rytr, takes the cake for its low price point, generous free tier, and impressive output. Pick your output type (from blog ideas to email and profile bios to longer-form copy) and tone (with 20+ options like “earnest,” “casual,” “convincing,” “enthusiastic” and “formal”), give the machine a few bullet points to get started, and get ready to be amazed.

From articles and blog posts to emails, sales copy, social media captions, and professional bios, generative AI can produce a vast array of text types and styles.

The big change is that you no longer need a separate 'AI copywriter' for every task. General-purpose assistants such as ChatGPT, Gemini, and Claude can draft and edit in many languages, follow detailed instructions, work from examples you provide, and refine the result through conversation.

For example, instead of simply selecting a preset tone, you can ask an AI assistant to:

·  Rewrite an email so it sounds warmer but not more informal

·  Give you five alternatives for a difficult sentence, from neutral to persuasive

·  Adapt a US English text for a UK audience

·  Polish a translation while preserving approved terminology

·  Draft a LinkedIn post based on a set of bullet points and match your usual voice

·  Compare two versions and explain which changes affect meaning

Specialist tools such as Writesonic, Jasper, Copy.ai, and Rytr still exist and can be useful if you want marketing templates, campaign workflows, or highly structured content-generation features. But for many language professionals, a general-purpose assistant is now the most flexible place to start.

Rytr, for example, remains a low-cost AI writing option, but its multilingual access and plan limits have changed over time. As with all SaaS tools, check the current language coverage and plan details before committing.

Create blog posts, emails, and more with Rytr's AI-powered copywriting in any tone or style.

How translators and interpreters can use AI writing assistants to write faster and better

As multilingual language professionals, we write — a lot.

Emails. Social media copy. Our websites and professional profiles. Speeches. And, of course, our translations!

Our words matter. And we're judged on them — even when we're writing in a non-native language.

But coming up with the perfect turn of phrase, an email pitch to a prospective client, or a relevant blog post isn't always easy.

AI writing assistants can save time, help you get past the blank page, and suggest alternatives you might not have considered. The best results come when you treat them as assistants rather than automatic replacements for your own language expertise.

As with any technology, always use AI with caution.

First, check meaning as well as style. A beautifully rewritten sentence can still introduce a subtle change in meaning, terminology, register, or factual content.

Second, think about confidentiality. Before pasting client material into an AI service, check your client agreements, NDAs, company policies, and the tool's current data-use and retention terms. For sensitive work, use only tools and account settings that are appropriate for the material.

Third, remember that generative AI can hallucinate. If you ask it to generate facts, examples, quotations, or sources, verify them independently.

And finally, you're still in charge. For professional translation, proofreading, and editing work, the human language professional remains responsible for the final text.

So what are you waiting for? Instead of staring at a blank screen or fretting about your grammar in one of your working languages, try one of these AI writing assistants and combine its suggestions with the judgment, context, and creativity that only you can bring.

This article is based on our techforword insiders webinar AI writing assistants: Hype or help?. For a deep dive and hands-on practice to test out these techniques, check out the replay. Not an insiders member yet?

Join now to access 50+ hours of training to boost your translation or interpreting in the premier community for innovative language professionals!

First published in June 2024. Revised in August 2026.