Editing a PDF is not, in itself, against the law. The file format is not the question; the document is. Correcting documents you wrote and still control is ordinary: your invoice, your CV, your letter, a contract you are still drafting. Changing a document someone else issued, so that it says something they did not say and others rely on it, is forgery or fraud in many legal systems. And a contract both parties signed, changed afterwards by one of them, is not the contract they signed. This page sets out where those lines usually fall. It is general information, not legal advice: the law differs between countries, and when something real depends on a document, ask a lawyer where you live.
Can I edit my own PDF?
Yes. A document you wrote and still control is yours to correct, whatever tool you use: a wrong date on your own invoice before you send it, a typo in your CV, a misspelled name in your letter, a clause in your draft contract. That is the use PDF Textfix is made for, and its Mac App Store listing describes it in those terms: it “corrects the text of your own PDFs with the fonts inside the document”.
Once you have sent a document, others may have relied on the version they received. Fixing your copy is fine; quietly replacing the one they have is not. Send the corrected file and say what changed. For an invoice already sent, ask your accountant how a correction must be made where you work before you send a new file. Fixing an invoice PDF you issued covers the practical side.
Can I edit a PDF someone else sent me?
For your own use, mostly yes: highlighting, notes, filling in a form you were asked to fill. Changing what the document says and then presenting it as the sender’s document is different. Many legal systems treat that as forgery. In England and Wales, the Forgery and Counterfeiting Act 1981 says: “A person is guilty of forgery if he makes a false instrument, with the intention that he or another shall use it to induce somebody to accept it as genuine, and by reason of so accepting it to do or not to do some act to his own or any other person’s prejudice.” In the United States, Cornell’s Legal Information Institute summarizes the common-law rule: “Under common law, forgery is a crime committed when a person creates or alters a legal instrument with the intent to defraud.”
The pattern is the same in both: an altered document, used to make someone accept it as genuine and act on it. The software is irrelevant. A pen does the same.
What about signed and certified PDFs?
A contract that both parties signed is the version they signed. If one party changes the text afterwards, the result is not the contract, whatever it looks like. Digital signatures make this visible: the PDF standard says that when a viewer recomputes a signature’s digest, “Differences in the digest values indicate that modifications have been made since the document was signed.” A certified PDF goes further: the standard lets its author permit no changes at all, or only some, such as filling in forms and signing, and any other change invalidates the certification.
The right way to change a signed contract is an amendment or a new version that every party signs again. A typo can be fixed the same way. For the other side of the question, what a recipient can check in a PDF they were sent, see can you tell if a PDF has been edited? PDF Textfix asks before the first edit of a signed or certified document and says that saving will make its signatures stop verifying. How to edit a signed PDF explains what that means in practice, and correcting a contract PDF covers the drafting stage, where editing is routine.
What about documents issued to me?
Certificates, transcripts, official letters, statements from an employer or an institution: these documents speak for the issuer. Even when one contains a real mistake about you, the fix is to ask the issuer for a corrected copy. A version you corrected yourself is a document the issuer never issued, and the person who receives it is entitled to assume they did. Ask, keep the issuer’s reply, and use their corrected file.
What does the PDF Textfix licence say?
The terms of PDF Textfix have a list headed “What you may not do”. Its first item is that you may not “use PDF Textfix to change a document you have no right to change, or to make a document say something false in a way that deceives others or breaks the law, such as forging a signed agreement, an official record, a certificate or an invoice.”
The full text is in the terms. The app is built for correcting your own documents, and the listing and the website describe it that way.
When should I talk to a lawyer?
When anything real depends on the document: money, a contract, an application, a dispute. Also when you are unsure whether you have the right to change a document, for example one written by a former employer, a co-author or a client. The answer depends on your country, on any agreement between you, and sometimes on copyright, and a short consultation costs less than the problem.
Questions people ask about editing PDFs and the law
Is it illegal to edit a PDF?
No. Editing your own documents is ordinary. What can be illegal is altering a document someone else issued, or one both sides signed, and using it to deceive.
Can I fix a typo in a contract we both signed?
Not on your own. Agree on the correction with the other party and record it the way your contract allows, such as an amendment that both sign.
Is it legal to edit a PDF I bought or downloaded?
For your own use, usually. Publishing or selling an edited copy of someone else’s work can need the author’s permission. Check the licence that came with it.