AI Grammar & Spelling Fixer
Paste any text and get it corrected instantly — grammar, spelling, and punctuation — 100% private, running entirely in your browser.
Warten auf Engine-Aktivierung
Verarbeitung auf dem Gerät•100% PRIVAT
Corrected text will appear here...
Professional Grammar Correction, Fully Private
Complete Grammar & Spelling
Fixes subject-verb agreement, tense consistency, word choice, run-on sentences, fragments, and common spelling mistakes — all in a single pass.
100% Private & Offline
All processing happens inside your browser using WebGPU or WebAssembly. Your text — no matter how sensitive — never touches a server or cloud API.
Punctuation & Flow
Adds missing commas, corrects apostrophes, fixes run-on sentences, and improves overall readability while preserving your natural writing style.
Preserves Your Voice
The AI corrects errors without rewriting your ideas. Your original meaning, structure, and vocabulary are kept intact — it fixes only what's wrong.
Their are many resons
There are many reasons
she dont like it
She doesn't like it.
its very importent
It's very important
Wie es funktioniert
Einfach, schnell und sicher. Verarbeiten Sie Ihre Datei in 3 einfachen Schritten.
Paste Your Text
Drop any text into the input — emails, cover letters, essays, social posts, or rough notes. Any length works.
AI Scans Instantly
The local AI model reads every sentence and identifies grammar errors, misspellings, punctuation issues, and awkward phrasing.
Get a Clean Result
The corrected version streams into the output panel in real time. Copy it, export it as PDF, or paste it back into your document.
Warum PDFaiGen wählen?
Wir bauen die Zukunft der Dokumentenverarbeitung — fokussiert auf Privatsphäre, Geschwindigkeit und Design.
100% Privatsphäre Garantiert
Keine Cloud-Uploads. Ihre Dateien werden vollständig auf Ihrem Gerät mit WebAssembly-Technologie verarbeitet.
Blitzschnell
Null Upload-Zeit. Null Download-Zeit. Sofortige Verarbeitung durch Ihre eigene Hardware.
Einfach zu Bedienen
Einfache Drag-and-Drop-Schnittstellen für Effizienz. Keine Konten erforderlich.
Häufige Anwendungsfälle
Sehen Sie, wie andere dieses Tool nutzen, um Zeit zu sparen und Arbeitsabläufe zu verbessern.
Professional Emails
Make sure every email you send to clients, managers, and stakeholders is error-free, clear, and professionally worded — in seconds.
Academic Essays & Papers
Fix grammar and punctuation in essays, research papers, and dissertations without risking your work being processed by a third-party AI.
Cover Letters & CVs
Ensure your job application documents are polished and error-free. First impressions matter — a single grammar mistake can cost you the interview.
Non-Native English Writing
Perfect for ESL writers. Get native-quality grammar corrections that teach you the right patterns while fixing your text right now.
Social Media & Blog Posts
Clean up captions, tweets, LinkedIn posts, and blog drafts before publishing. Keep your audience focused on your message, not your mistakes.
Confidential Business Documents
Fix grammar in reports, legal drafts, proposals, and internal memos — with zero risk of sensitive information reaching a cloud service.
Complete Guide: How to Use the AI Grammar Fixer
PDFaiGen's AI Grammar Fixer runs a powerful language model directly in your browser — no uploads, no accounts, no cloud. Paste any text, click Fix Grammar, and get a fully corrected version streamed back in real time. Works for short messages, long reports, academic papers, and everything in between.
Set Up the AI Engine (First Time Only)
On your first visit, click the model selector and choose your preferred AI model. Click 'Setup Engine' to download it to your browser cache. Downloads range from 400MB to 2.2GB and happen once — the model is cached permanently for instant reuse offline.
Paste Your Text
Click inside the left input panel and paste your text — or click 'Try Example' to load a sample text with common grammar mistakes. You can edit the text before fixing. The word and character count updates live as you type.
Click Fix Grammar
Press the 'Fix Grammar' button. The AI starts processing immediately and streams the corrected version into the right output panel in real time — you can read the corrections as they appear.
Review the Corrections
The corrected text preserves your original meaning, structure, and vocabulary — only genuine errors are changed. The output panel shows the final word count so you can confirm the length is appropriate.
Copy or Export as PDF
Click 'copy' to send the corrected text to your clipboard, ready to paste anywhere. Click 'PDF' to download a formatted PDF. Then click 'Fix another text' to start fresh.
Pro Tips
- For best results, use Gemma 4B (High Accuracy) — it handles complex grammar like subject-verb agreement, tense shifts, and comma splices better than smaller models.
- The AI fixes grammar without changing your meaning or style. If you want rewrites or tone changes, try the AI Writer or Tone Shifter tools instead.
- You can stop generation mid-way using the Stop button — the partial corrections shown are usable and can be copied immediately.
- Non-native English writers: compare the input and output side by side to learn the patterns the AI corrected.
Common Issues
Output looks the same as input?
Your text may already be grammatically correct. Try the 'Try Example' button to load text with intentional errors and verify the tool is working.
Model is slow or not responding?
If WebGPU isn't available, the AI uses CPU mode which is slower. Switch to a smaller model like Qwen 2.5 (Lightweight) or Phi-3 for faster processing.
Some errors weren't fixed?
The AI may miss very domain-specific terminology or highly technical jargon. Running the corrected output through the tool a second time often catches remaining issues.
Ihre Privatsphäre ist unsere Priorität
Im Gegensatz zu anderen Online-Tools verarbeitet PDFaiGen Ihre Dateien direkt in Ihrem Browser. Keine Uploads, keine Datenlecks.
Null Uploads
Dateien verlassen niemals Ihr Gerät. Die gesamte Verarbeitung erfolgt lokal im Speicher Ihres Browsers.
End-to-End-Privatsphäre
Da keine Daten an einen Server gesendet werden, bleiben Ihre vertraulichen Dokumente vollständig privat.
Funktioniert Offline
Einmal geladen, funktionieren unsere Tools ohne Internet. Keine Datennutzung erforderlich.
Fix Your Grammar for Free
No account, no API key, no data leaving your browser. Paste your text and get it corrected instantly.
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