Why Grammar Check PDFs Specifically?

Most grammar tools (Grammarly, LanguageTool) work in text editors and browsers — not on PDFs. If your final document is a PDF — a report, an academic paper, a legal brief — you're stuck converting formats, checking, and converting back. Our tool checks the PDF directly.

What the AI Checks

• Grammar — subject-verb agreement, tense consistency, pronoun agreement, sentence fragments
• Spelling — typos, homophones (their/there/they're), commonly confused words
• Punctuation — missing commas, incorrect apostrophes, runon sentences
• Clarity — passive voice, nominalisation, overly complex sentence structure
• Conciseness — redundant phrases, filler words, verbose constructions
• Style consistency — inconsistent use of Oxford comma, capitalisation of proper nouns

Grammar Check vs a Human Editor

AI grammar checking excels at systematic errors — it catches every instance of "its vs it's" confusion, every passive construction, every sentence fragment. Human editors excel at high-level issues: argument flow, tone, audience appropriateness.

Use AI grammar check as a first pass to eliminate mechanical errors, then review the content for structure and argument if high-stakes accuracy is required (legal documents, journal submissions).

Technical and Academic Writing

The AI is calibrated for technical and formal writing. It understands that:

• Domain-specific terms (e.g., "hyperparameter", "jurisprudence", "myocardial infarction") are not typos
• Passive voice is acceptable in scientific writing (e.g., "the sample was incubated")
• Numbered citations like [1] or (Smith, 2024) are reference markers, not errors

Getting the Best Results

• Use on text-based PDFs. Scanned documents need OCR first
• Review each suggestion individually — AI suggestions improve your document, they don't override your voice
• For non-English documents, use our Translate PDF tool to translate first, check grammar in English, then translate back