"Editing a PDF" means different things to different people: some want to change existing text, some to add notes on top, some to sign. Pick the right tool and it takes seconds. Here's a roadmap by need.
1) Change or delete existing text
If you want to actually remove text in a PDF and type new text, use the "Edit PDF" tool. Draw a box over the text to change, type the new text (leave empty to delete) and download.
Edit PDF — Truly delete and replace existing text — draw a box, type the new text, download.
2) Add text, notes or marks on top
To add text, highlights, boxes or drawings on top without touching existing text, the "Annotate PDF" tool is ideal. You can also use it to fill in blanks on forms.
3) Sign
To sign a document, use the "Sign PDF" tool to draw, type or upload your signature and place it anywhere on the page. Signing happens entirely on your device.
4) Fill forms
For forms with no fillable fields (flat), you can fill them by adding text directly on top — see our form-filling guide for detailed steps.
For confidential documents, annotating and signing run entirely on your device; your file doesn't go to a server. Real text deletion/editing is done on a secure server and the file isn't stored after processing.
Ask the right question first: what do you want to edit?
«Editing a PDF» is not one job; it is a shared name for several similar-looking jobs with different results. Picking the wrong tool makes the task look impossible or produces an unexpected outcome. Four questions separate what you need:
- Are you changing text in the document? — you need text editing.
- Are you adding your own notes? — markup is enough.
- Are you arranging pages (delete, reorder, merge)? — page tools.
- Are you removing information permanently? — redaction; markup or cropping will not do.
What to watch for in free tools
A tool offered free usually charges somewhere else, and it is worth seeing where before you start. The common patterns: a watermark on the output, a daily or hourly limit, your document uploaded to a server, a mandatory account before download, and reduced quality in the downloaded file. Checking those five points while trying a tool keeps you from getting stuck mid-task.
Before you start editing
The type of document largely decides what you can do. In a PDF with a text layer you can change the text; in a scan the page is an image and needs converting to text first. If the document is password-protected, no tool can read its content until the password is removed. Those two checks answer most of the «why is it not working?» questions upfront.
Common scenarios and the right order
- Changing a clause in a scanned contract: convert to text first, then edit.
- Turning several documents into one file: merge, then reorder, then add numbers last.
- Cleaning a document before sharing: delete unneeded pages, redact sensitive data, clear metadata.
- Filling and returning a form: fill, sign, lock, and compress if needed.
The limits of editing
Text in a PDF does not flow; replacing a word with a longer one does not reflow the line. For small corrections that is no problem, but if paragraphs will be rewritten, producing the document from its source or converting to Word is less work. The test is simple: a few words means edit directly, pages of rewriting means convert.