1. Grammarly
Grammar, spelling and tone suggestions everywhere you write.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Grammar, spelling and tone suggestions everywhere you write.
Best Fillora PDF - Free AI Grammar Checker Alternatives in 2026
Fillora PDF - Free AI Grammar Checker is a strong option, but it is not the right fit for everyone. Below are 10 alternatives compared on rating, install base, pricing and the use case each one actually wins on.
About Fillora PDF - Free AI Grammar Checker
Fix grammar, spelling, punctuation, and improve writing style instantly with Fillora PDF AI Grammar Checker.
Free
Full reviewComparison at a glance
| Extension | Rating | Users | Pricing | Best for |
|---|---|---|---|---|
| Fillora PDF - Free AI Grammar Checker (original) | — | — | Free | Fix grammar, spelling, punctuation, and improve writing style instantly with Fillora PDF AI Grammar Checker. |
| Grammarly | 4.5 | 37M+ | Freemium | Professionals and students who write daily in the browser and want a safety net before hitting send. |
| LanguageTool | 4.7 | 2M+ | Freemium | Multilingual writers and privacy-conscious teams who want a self-hostable alternative to Grammarly. |
| Revision History: Writing Process Visibility for Google Docs & Slides | 3.7 | 200K+ | Freemium | Built for teachers: See how students write, not just what they wrote. View the writing process in Google Docs & Slides. |
| Justdone: GPT-4o AI Writing Assistant & Grammar Checker | — | — | Free | Elevate your writing with Justdone — your all-in-one tool for grammar checking, paraphrasing, AI writing, and more. |
| Ddict: AI Translation & Writing Assistant | — | — | Free | Translate text and enhance writing with AI for seamless language learning and communication in your browser. |
| Free Auto Text Expander for Google Chrome™ | 3.3 | 80K+ | Free | Create custom keyboard shortcuts to expand and replace text as you type! |
| Grammar Checker and AI tool - Correcto | — | — | Free | Improve your writing with the AI-powered online grammar and spelling checker in Spanish and our paraphrasing tool. |
| TLDR This - Free automatic text summary tool | 3.7 | 60K+ | Free | Automatically summarize any article, text, document, webpage or essay in a click. |
| autoTranslate - Translate web & PDF, Dictionary | 4.2 | 30K+ | Free | Automatic translate full webpage & PDF. Translate while u read & write in 248 languages. Highlight & replace text. Save phrases. TTS |
| Fix Grammar and Spelling | — | — | Free | Instantly fix grammar and improve your writing in any text field. Check typos, preview changes, and apply corrections with one click |
Fillora PDF - Free AI Grammar Checker alternatives in detail
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2. LanguageTool
Open-source grammar checker supporting 30+ languages.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Open-source grammar checker supporting 30+ languages.
3. Revision History: Writing Process Visibility for Google Docs & Slides
Built for teachers: See how students write, not just what they wrote. View the writing process in Google Docs & Slides.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Built for teachers: See how students write, not just what they wrote. View the writing process in Google Docs & Slides.
4. Justdone: GPT-4o AI Writing Assistant & Grammar Checker
Elevate your writing with Justdone — your all-in-one tool for grammar checking, paraphrasing, AI writing, and more.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Elevate your writing with Justdone — your all-in-one tool for grammar checking, paraphrasing, AI writing, and more.
5. Ddict: AI Translation & Writing Assistant
Translate text and enhance writing with AI for seamless language learning and communication in your browser.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Translate text and enhance writing with AI for seamless language learning and communication in your browser.
6. Free Auto Text Expander for Google Chrome™
Create custom keyboard shortcuts to expand and replace text as you type!
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Create custom keyboard shortcuts to expand and replace text as you type!
7. Grammar Checker and AI tool - Correcto
Improve your writing with the AI-powered online grammar and spelling checker in Spanish and our paraphrasing tool.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Improve your writing with the AI-powered online grammar and spelling checker in Spanish and our paraphrasing tool.
8. TLDR This - Free automatic text summary tool
Automatically summarize any article, text, document, webpage or essay in a click.
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Automatically summarize any article, text, document, webpage or essay in a click.
9. autoTranslate - Translate web & PDF, Dictionary
Automatic translate full webpage & PDF. Translate while u read & write in 248 languages. Highlight & replace text. Save phrases. TTS
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Automatic translate full webpage & PDF. Translate while u read & write in 248 languages. Highlight & replace text. Save phrases. TTS
10. Fix Grammar and Spelling
Instantly fix grammar and improve your writing in any text field. Check typos, preview changes, and apply corrections with one click
Why it replaces Fillora PDF - Free AI Grammar Checker: Covers similar ground in the Writing category: Instantly fix grammar and improve your writing in any text field. Check typos, preview changes, and apply corrections with one click
Compare Fillora PDF - Free AI Grammar Checker head-to-head
Direct comparisons with the extensions people weigh against it.
Grammarly vs LanguageToolThe market leader against the open-source challenger with self-hosting and stronger multilingual support.Grammarly vs WordtuneCorrectness-first editing versus rewriting and tone control for the same sentence.LanguageTool vs WordtuneBoth are writing extensions people shortlist together — see how ratings, install base, pricing and day-to-day use differ.All comparisonsThe full compare hub, grouped by category.
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Frequently asked questions
What is the best alternative to Fillora PDF - Free AI Grammar Checker?
Grammarly is the closest match. Covers similar ground in the Writing category: Grammar, spelling and tone suggestions everywhere you write.
Is there a free alternative to Fillora PDF - Free AI Grammar Checker?
Yes — Justdone: GPT-4o AI Writing Assistant & Grammar Checker, Ddict: AI Translation & Writing Assistant, Free Auto Text Expander for Google Chrome™ are free.