How to Spell Check a PDF (4 Quick Methods)

PDFs are great for sharing, not for live editing. That’s why you don’t see the same built-in spell checker you get in Word or Google Docs. Still, you can catch and fix spelling mistakes in almost any PDF, including scanned and locked files, with the right workflow.

We’ll walk you through 4 easy methods to spell check PDF documents using Smallpdf. You’ll see when to use each method and how to keep your layout intact.

Start here: Use the AI tool below to upload your PDF and flag potential spelling mistakes.

PDFs don’t have their own spell checker, so you combine our features with external editors to catch errors efficiently.

Method 1: Spell Check PDF With Smallpdf AI PDF

AI PDF gives you a smart overview of possible spelling issues without changing your layout.

• Go to Smallpdf AI PDF.

• Upload your PDF from your device, Google Drive, Dropbox, or OneDrive.

• Ask something like “Highlight spelling mistakes in this PDF” or “List possible typos page by page.”

• Review the suggestions and decide which changes you actually want.

• Open Edit PDF or PDF to Word to fix the text based on those suggestions.

AI PDF helps you spot errors faster, especially in long reports or contracts, while you stay in control of every change.

Method 2: Convert the PDF to Editable Text

For full spell checking with your usual editor, converting is often the most thorough approach.

• Upload your file to PDF to Word on Smallpdf.

Start here: Use the converter below to upload your PDF and convert it to Word for a full spell check in your usual editor.

• Download and open the converted Word document or import it into Google Docs.

• Run the built-in spell checker in Word or Google Docs.

• Accept or reject each suggestion, including spelling, capitalization, and basic grammar.

• Save your corrected document as a PDF again.

• If needed, open it in Edit PDF for final layout tweaks.

This method works best when your PDF is text-based, and you care about catching every small typo.

Method 3: Use OCR To Spell Check a Scanned PDF

If your PDF is a scan, the “text” is actually an image. You need OCR before any spell checking.

OCR stands for Optical Character Recognition, which means turning images of text into real, selectable text.

• Upload your scanned file to Smallpdf PDF to Word.

• Let OCR process the pages and produce an editable document.

• Open the result in Word or Google Docs and run spell check.

• Correct errors, then export the document back to PDF.

• Use Edit PDF to adjust any spacing or line breaks that have shifted.

OCR is especially useful for scanned contracts, forms, or printed manuals that need a spelling cleanup.

Method 4: Fix Single Typos Directly in Edit PDF

If you only see a few obvious mistakes, you can fix them right inside the PDF without a full spell check.

• Open the file in Edit PDF.

Quick fix: Use the editor below to upload your PDF and correct the mistakes directly.

• Select the text tool and click on the typo.

• Correct the word directly in the text box.

• Repeat for any other visible errors.

• Click “Finish” and download the updated PDF.

This method is ideal for quick fixes when you already know where the mistakes are.

Sometimes your PDF is locked, scanned, or limited by form settings. You still have options.

• If the file is password-protected and you have permission, use Unlock PDF to open it for editing.

• For scanned files, run OCR so the text becomes editable.

• When layout is very rigid, you can cover a typo with a white rectangle in Edit PDF, then add a new text box on top with the correct spelling.

• For heavy editing, export to Word with PDF to Word, fix everything there, and convert back to PDF afterward.

These workarounds let you correct spelling even when the original text layer is locked down.

You can mix and match our features to handle almost any PDF scenario while keeping your layout close to the original.

Teams that handle contracts and reports often start with AI PDF to scan for issues, then use PDF to Word for deeper edits. That mix keeps reviews fast while protecting the original design as much as possible.