Spellcheck PDF - Check PDF text with AI
Check the spelling in a PDF without converting it first.
Need to do more with your PDF?
Pick from 50 apps, all free to try: convert, edit, merge, compress, sign, or chat with a PDF using AI. Or open the workspace to run several on one file.
Proofread a finished document
Check a PDF in place instead of exporting it back to a word processor.
Set the document language
Spelling depends entirely on which language you are checking against, so the language is a setting rather than a guess.
No round trip
Checking the PDF directly avoids converting it to Word, fixing the text there, and exporting it back - a loop that usually damages the layout on the way.
Catches what a last read misses
Errors are hardest to see in your own document. A mechanical check finds the ones your eye has learned to skip over.
Check a PDF you cannot edit
By the time a document is a PDF the source file is often gone, or belongs to someone else. Checking the spelling normally means converting it back to an editable format first, which rearranges the layout and creates a second document to keep track of.
Checking the PDF as it is avoids all of that. It is the practical way to proofread something at the point where proofreading actually happens - when the document is finished.
Each marked word comes with one suggested correction
Set the language before you check
A spellchecker is only a comparison against a dictionary, so the language decides everything. Checking an English document against a German dictionary reports every word as wrong, and the reverse quietly misses real errors.
Choose the language the document is written in. A document that genuinely mixes languages will always produce some noise, so treat those results as a list to review rather than a verdict.
Each marked word comes with one suggested correction
Spellcheck a PDF in the browser
Nothing to install and no word processor needed. The check runs from a browser tab on Windows, macOS, Linux, Android and iOS.
Upload from your device, from a link or from cloud storage, up to 50 MB without an account.
Your text is not training data
AI features raise a fair question about what happens to what you send. The answer is short.
Never used to train models
The private files you upload are not used to train AI models. That is the policy, not a setting you have to find.
Encrypted, and read by nobody
Traffic runs over TLS with modern ciphers and personal data is stored encrypted. No person reads your document, and no backup of a user file is kept.
Yours throughout
The copyright and the ownership of what you upload and what comes back stay with you. Processing follows the GDPR.
How to spellcheck a PDF file?
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Upload your PDF.
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Select your target language.
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Start the AI spellcheck.
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Review the corrected text next to the original.
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Export the corrected version as a PDF if needed.
Frequently asked questions about spellchecking PDFs
Is it free to spellcheck a PDF?
Yes, within the free limits. Files up to 50 MB can be checked without an account, and a free account or a paid plan raises that limit.
Which language does it check against?
Whichever you select. Setting the right language is the whole game - the wrong one reports every word as an error or misses real ones.
Does it work on a scanned PDF?
Not directly. A scan is an image with no text in it, so add a text layer with the searchable-PDF tool first, and bear in mind that recognition errors will then show up as spelling errors.
Will it fix the mistakes for me?
It reports what it finds. Correcting the text means editing the document, which is what the PDF to Word conversion is for if you need to make changes.
Can it handle a document in two languages?
It checks against the language you choose, so a mixed document will produce noise from the other language. Treat the output as a list to review.
Is it safe to check a document online?
Yes. The private files you upload are never used to train AI models. The connection is encrypted, the processing is automated so no person reads your document, no backup of a user file is kept, and the copyright stays with you. The service runs under the GDPR.
Blog
Why can I not edit my PDF?
The reasons a PDF resists editing, and what to do instead.
Read articleHow to translate a PDF into another language
The article explains how to translate a PDF document.
Read articleKnowledge Base
What the format is, why it looks the same everywhere, and what it carries besides pages.
How a scanned page becomes selectable text instead of a picture of words.
Plain text with no formatting, the smallest and most portable way to keep words.
The structure that tells software the reading order of a page.
What the term means in this context, and what it does not.
The author, dates and software details a PDF carries alongside its pages.
