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What is LanguageTool?
LanguageTool is an AI-based grammar, spelling and punctuation checker that runs in a web editor and also as add-ons and plugins for browsers, email clients and office suites. It supports many languages and offers extra style, punctuation and typography suggestions through its “Picky Mode.” You can paste or type text directly, and a free account adds saved texts, a personal dictionary and writing statistics.
Its main appeal is coverage across languages and across the places people actually write: web forms, email, documents. The browser add-on is aimed at checking text anywhere on the web, while integrations exist for Chrome, Edge, Firefox, Opera, Gmail, Outlook, Apple Mail, Thunderbird, Google Docs, Word, Apple Pages and LibreOffice. For teams, there is a business offering described as GDPR-conform, which matters if you handle sensitive communications and want consistent wording.
A practical starting point: test it on one real task you do often, such as a bilingual email or a long report, and compare the free editor with the browser add-on. If you write mostly in one language and one app, the relevant add-on is enough; if you need unlimited paraphrasing and the full set of suggestions, that is where the paid tier comes in. You can try the checker at LanguageTool.
How does LanguageTool's browser add-on work on websites like Gmail and Twitter?
LanguageTool's browser add-on checks what you type directly inside the text fields of websites such as Gmail and Twitter/X, so you don't have to copy text into a separate editor. The page states the add-on "works anywhere on the web" and gives tips while you type an email, blog post or tweet, and it lists Chrome, Edge, Firefox and Opera as supported browsers.
In practice, that means:
- As you compose, the add-on flags grammar, spelling and punctuation issues in the same box you're writing in.
- You can accept, ignore or review suggestions without leaving the page.
- It works across sites rather than being tied to one platform, which is why Gmail and social posts are typical uses.
Where it fits best
| Situation | Browser add-on | Web editor |
|---|---|---|
| Quick email or tweet | Strong fit — checks in place | Extra step of pasting text |
| Long document or essay | Workable but cramped | Better: distraction-free, saved texts, statistics |
| Consistent terminology | Limited to what the add-on shows | Personal Dictionary and stored texts help |
A practical example: if you draft a client email in Gmail, the add-on catches a missing comma or a wrong verb form before you hit send. For a longer report, move to the editor, where you get saved texts, statistics and the optional "Picky Mode" for advanced punctuation, style and typography suggestions.
As a next step, install the add-on for your browser, then test it on one real message. If you write mostly short messages, the add-on alone may be enough; if you write longer pieces regularly, pair it with the editor. Compare options at LanguageTool.
What extra features does LanguageTool Premium offer compared to the free version?
LanguageTool Premium mainly adds unlimited use, more advanced checks, and privacy/team options on top of the free checker. The free version already catches grammar, spelling and punctuation errors in many languages, but it has limits on text length and on how many advanced suggestions you get.
What Premium adds
- Higher or unlimited text limits. The free web editor caps how much you can check at once; Premium removes or raises that ceiling for long documents.
- Picky Mode. This unlocks extra suggestions for style, typography and advanced punctuation that the free version hides or limits.
- Unlimited paraphrasing. The paraphrasing tool is available to try, but Premium makes it unlimited.
- Personal Dictionary and saved texts. Free account holders can store texts and build a personal dictionary, but Premium makes these more useful for ongoing work.
- Business/GDPR options. LanguageTool for Business is aimed at organisations that need GDPR-conform checking and a consistent brand voice across teams.
Free vs Premium at a glance
| Area | Free | Premium |
|---|---|---|
| Basic grammar/spelling | Yes | Yes |
| Text length | Limited | Higher/unlimited |
| Picky Mode (style, typography) | Limited | Full |
| Paraphrasing | Limited | Unlimited |
| Saved texts / Personal Dictionary | Basic account features | Fuller use |
| Business/GDPR | No | Yes, via LT for Business |
Who should pay
If you write short emails or social posts, the free version is usually enough. If you write long reports, academic work or multilingual content, or you want style and typography suggestions, Premium is the more practical choice. Teams with compliance needs should look at the business option rather than individual Premium.
A useful next step: paste a typical piece of your own writing into the free editor and note how often you hit the text limit or see a locked suggestion. If that happens regularly, Premium is worth considering. You can compare plans at LanguageTool.
Is LanguageTool suitable for business use and does it comply with GDPR?
Yes. LanguageTool is positioned for business use, and its own page states that its business offering is a GDPR-conform solution for error-free communication and a consistent brand voice. It also lists a Proofreading API and organizations such as European Union, Spiegel Magazine, dpa, Heise, Max-Planck-Gesellschaft, Bertelsmann Stiftung and JetBrains among those trusting its writing tools.
H3 What business suitability looks like in practice
- Team writing consistency: Useful where many people write emails, documentation, reports or marketing copy and you want a shared standard for grammar, punctuation and tone.
- Integration into existing workflows: The page lists browser add-ons (Chrome, Edge, Firefox, Opera), email add-ons (Gmail, Outlook, Apple Mail, Thunderbird), office plugins (Google Docs, Word, Apple Pages, LibreOffice), desktop apps (macOS, Windows) and a Proofreading API.
- Language coverage: The site says it checks more than 30 languages, which matters for multilingual teams and customer-facing content.
- Administrative features: The editor mentions a personal dictionary, statistics, secure text storage, and a “Picky Mode” for advanced punctuation, style and typography suggestions.
H3 GDPR considerations
The website explicitly describes its business solutions as GDPR-conform. For a compliance decision, verify the current details directly with the vendor: data processing agreement, data location, retention, subprocessors, and whether texts are stored or used for model training. Those specifics are not fully established by the homepage alone.
H3 Practical decision criteria
| Need | LanguageTool fit |
|---|---|
| Multilingual team proofreading | Strong, given 30+ languages |
| Embedding checks in apps or workflows | Possible via the Proofreading API |
| Working inside browsers, email and office tools | Broad add-on and plugin coverage |
| Strict data-processing requirements | Ask for the DPA and data-handling terms before rollout |
A useful next step: run a pilot with a small team, test the editor and one integration (for example the browser add-on or Word plugin), and request the business documentation, including the GDPR-related terms, before deciding on a wider deployment.
How accurate is LanguageTool's AI grammar checker compared to other tools?
LanguageTool is generally accurate for catching everyday grammar, spelling, and punctuation errors, and its main practical advantage is breadth: it checks over 30 languages and works as a browser add-on, email add-on, and office plugin, so it can follow you across the web rather than living in one editor. Its "Picky Mode" adds style, typography, and advanced punctuation suggestions, which matters if you write formal or publication-style text. Accuracy is best understood by error type rather than as a single score: routine mistakes and common agreement or article issues are handled well, while nuanced tone, complex restructuring, and context-dependent word choice are where any AI checker, including this one, needs a human review.
How it compares in practice:
| Tool type | Typical strength | Typical trade-off |
|---|---|---|
| LanguageTool | Multilingual coverage, browser/email/office integrations, style and typography checks | Less aggressive at rewriting whole sentences than some AI-first editors |
| AI writing assistants (e.g., Grammarly) | Strong English fluency suggestions, tone and clarity rewrites | Primarily English-focused; heavier rewriting can change your voice |
| Built-in word processor checkers | Zero setup, integrated with your document | Fewer advanced style, punctuation, and multilingual checks |
A realistic scenario: a non-native English speaker drafting client emails in a browser would get the most value from the add-on, because it flags errors as they type without switching apps. A novelist polishing prose might find the style suggestions useful but still need a human editor for pacing and voice.
Whose observation is this?
The supplied page evidence is the product's own marketing description, not independent testing. Treat the listed capabilities as claims to verify in your own writing rather than measured accuracy results.
Next step: run the same 300–500 word sample of your real writing through LanguageTool and one alternative, then count which errors each catches and which suggestions you actually accept. That acceptance rate is the accuracy metric that matters for your work. For a second opinion on English, Grammarly is the common comparison point; for a fully open-source option, LanguageTool itself notes its community edition. If you write in multiple languages, prioritize multilingual coverage over English-only polish.
Can I use LanguageTool to check grammar in languages other than English?
Yes. LanguageTool checks grammar, punctuation, and spelling in more than 30 languages, so it is not limited to English. You can paste text into the web editor or type directly, and the same checking engine is available through browser add-ons, email add-ons, and office plugins listed on the site.
H3 How it fits different readers
- If you write mostly in one non-English language, the web editor is the simplest starting point: paste a draft and review the suggestions.
- If you switch between languages during the day, the browser add-on is more practical because it works while you type in web forms, email, and social posts.
- If you write in an office suite, the Google Docs, Word, Apple Pages, and LibreOffice plugins keep checking inside the document rather than requiring a copy-and-paste step.
H3 What to expect across languages Coverage and suggestion quality are not identical in every language. A widely used language with more training data will generally produce more reliable style and grammar suggestions than a smaller language, and some advanced checks may be tied to the Premium tier rather than the free checker. The site also notes that texts can be stored securely and that a personal dictionary and statistics are available in the editor, which helps if you regularly write in a language with names or technical terms that a general checker misreads.
H3 A practical next step Pick one real paragraph you have written in your other language, run it through the editor, and note which suggestions are genuinely useful versus noise. That tells you quickly whether the tool fits your language and writing style before you consider a paid plan. For a second opinion on a different language, you can compare results with Grammarly, though its language coverage is narrower than LanguageTool's.
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