How to edit a PDF
How do I edit a PDF?
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Short answer
Work out which job you actually have. Correcting a date, filling in a form, reordering pages and rewriting three paragraphs are four different operations with four different tools, and picking the wrong one is why editing a PDF has a reputation for being harder than it is.
Which of these is it?
Find your job in this list. Most of the difficulty in editing PDFs is people reaching for a full editor when they needed one of the easy ones.
| What you want | What you need |
|---|---|
| Fix a typo, a date, a number | PDF editor — genuinely good at this |
| Fill in a form | Fill PDF form, then flatten |
| Reorder, delete or rotate pages | Organize pages — lossless and instant |
| Sign it | Sign PDF |
| Rewrite whole sections | Edit the original document, or convert to Word and accept some tidying |
Small corrections
This is what a PDF editor is for, and it works better than its reputation suggests — as long as the change is small.
The catch is that replacement text is rarely the same width as what it replaced. Change "March" to "September" and the new word is longer, so it collides with whatever followed it. An editor handles this by nudging things, and nudging things has a limit.
A rule that holds up: if the replacement is about the same length, you will not be able to tell. If it is much longer, expect to spend a minute tidying — and if you find yourself tidying for ten minutes, you are doing the next job, not this one.
Actual rewriting
Go back to the source. Edit the document it was made from and export a fresh PDF — that is one step, and it is exact.
When the source is gone, PDF to Word gives you an editable approximation. It is a reconstruction rather than a conversion, because the structure that made the document editable was discarded when the PDF was written:
Fixed positions against reflowing content
- A PDF: every element at an absolute position on a page of a stated size. Nothing moves, ever.
- A word processor file: content with rules, laid out afresh each time it is opened.
- Converting from the left to the right means inferring the rules that were discarded — which is why the result needs tidying.
Expect to fix the layout. What a converter can and cannot recover sets expectations properly before you start.
One thing to check first: if the PDF is a scan there is no text in it at all, and no editor or converter can change that until OCR has run. Is this PDF scanned or is it text? takes two seconds to settle.
Three things that go wrong
Covering something with a white box does not delete it. The text is still in the file and still selectable. If the point is that nobody should read it, see proper redaction.
Editing breaks a signature, correctly. A signature covers the document as it was signed; change a comma and it no longer verifies. Sign last.
Fonts. If the document uses a font your editor does not have, edited text may be set in something else — noticeable in the middle of a line. Why PDFs look different on other computers covers why.
Tools this article covers
Sources
Primary documentation for the claims above.