How to edit the text in a PDF (without buying Acrobat)

2026-08-18

There are two completely different things people mean by editing a PDF, and confusing them is why so many free tools feel broken.

The first is annotation: drawing on top of the page. Highlighting, adding a comment, dropping a signature image. The original content is untouched - you are adding a layer above it.

The second is real text editing: changing the words that are stored in the file. That is what people usually want when they say they need to fix a typo in a contract, and it is what most free tools quietly do not do.

The white-box trick, and why it bites

A lot of editors fake it. They draw a white rectangle over the old text and put a text box on top. On screen it looks correct. The problems show up later:

• Select the text and you still get the original wording underneath.
• Search the document and it finds the old text, not the new.
• Print it on anything other than white paper and the box is visible.
• Anyone who opens it in a real PDF editor can move your box aside.

For a contract, an invoice or anything you are sending to someone else, that last point matters. The text you thought you replaced is still in the file.

How real text editing works

A PDF stores text as positioned runs of characters with a font reference. Editing properly means finding the run you want, replacing its contents, and re-laying-out the line so the spacing still looks right.

That is why a proper editor lets you click directly onto a line of text and type. If a tool makes you draw a box before you can type, it is annotating, not editing.

When it genuinely cannot be done

If your PDF is a scan - a photo of a page, saved as a PDF - there is no text in the file at all. It is one big image. Nothing can edit text that is not there.

You can still highlight, redact, sign and reorder pages in a scanned document. To change the words you would need OCR to convert the image into real text first, and OCR on a poor-quality scan introduces its own errors.

A quick test: open the PDF and try to select a sentence with your cursor. If it highlights word by word, there is real text. If you get a rectangle over the whole page, it is a scan.

Redaction is not the same as covering something up

This one has caused real leaks. Drawing a black rectangle over a name does not remove the name - it draws a black rectangle. The text stays in the file and can be copied straight out of it.

Proper redaction deletes the underlying content and then covers the area. If you are removing something sensitive before sharing a document, make sure you are using a redaction tool and not the shape tool.