Edit, annotate or redact a PDF?

Choose editing for a wording correction

Editing changes existing content. This site can replace supported text runs in their original streams, but it does not reflow whole paragraphs or handle every font. An editor that simply covers old words may leave the originals extractable. Check both appearance and copied text after a correction, and retain an untouched original.

A quick way to choose

Ask what you want to happen to the original words. If you want them changed, you are editing. If you want to leave them alone and add something beside or over them, you are annotating. If you want them gone for good, you are redacting. People use the three words interchangeably, which is how sensitive text ends up still inside a file that looks clean.

• Correct a typo or a number: edit.
• Highlight a clause, add a question or circle a figure for a colleague: annotate.
• Remove a name, account number or address before sharing: redact.
• Hide something “just for the screenshot”: still redact, because the file may be shared later.

What annotating does in this toolset

The Annotate PDF tool draws highlights, shapes, drawings and text onto the page and saves a new PDF with the markup as part of the page. That makes it visible in every viewer and in print. It also means the marks are not a comment thread: there is no author name, no reply and no resolve button, and the recipient cannot remove them one at a time. For discussion with several reviewers, use the comment features of your usual PDF reader, and use this tool for a final marked-up copy.

Pick one color per kind of comment, such as yellow for questions and red for corrections, and put text beside the thing it refers to rather than over it.

Choose annotation for review and added content

Annotations, highlights, drawings and added text are useful for comments and explanations. They are not necessarily replacements for the underlying words. Some annotation systems keep markups as removable objects, while other exports paint them into page content. Read the tool’s output description rather than assuming every annotation behaves the same way in every viewer.

Choose redaction for sensitive information

Redaction requires removing or irreversibly replacing sensitive content, not merely drawing a black rectangle. This site uses a visual raster workflow for selected regions, trading away text and interactive features on affected pages. Review all pages and inspect extracted content, metadata and attachments as appropriate. Neither ordinary editing nor a dark highlight is a complete sensitive-data removal process.

How to prove a redaction worked

Never judge a redaction by how it looks. Test the saved file.

• Try to select text under the black box with the mouse. Nothing should highlight.
• Use the viewer’s search for a word you covered. It should find nothing.
• Select all and paste into a text editor; the covered words must not appear.
• Check the document properties and the filename for the same names and numbers.
• Look for other places the information repeats: headers, footers, page numbers, form fields, attachments and bookmarks.

Redaction without losing the whole document’s text

The Redact PDF tool flattens the selected pages so the covered area is only pixels, which is why the covered text cannot be recovered. The price is that those pages lose selectable text, links and forms. If the rest of the document needs to stay searchable, split out only the pages that need redaction, redact them, and merge them back in the right place with Merge PDF. Then run the checks above on the final merged file, not only on the redacted pages.

Keep the unredacted original somewhere safe and clearly named, and never in the folder you are about to share.

Real-world mistakes that leak information

• Covering text with a rectangle or a highlight and sending the file. The text is still there underneath.
• Changing text with a normal editor and leaving the old text in the file’s history or in an attachment.
• Redacting the body but not the headers, footers or repeated reference numbers.
• Forgetting metadata: author names, titles and comments live in document properties, not on the page.
• Sending a redacted copy whose filename contains the person’s name.
• Trusting that “I’ll just flatten it” protects secrets. Flattening a form hides nothing; redaction removes content.

A worked example: sharing a contract with a client

Imagine you must send a contract to a client and a reviewer, with your bank details removed and a question flagged for the client. Doing this safely uses all three techniques in the right order, and the order matters.

First, fix any factual error in the text with the Edit PDF Text tool, and check the result. Second, redact the bank details by marking every place they occur, including the footer and the payment schedule, then run the verification checks on the saved file. Third, annotate the redacted copy with a highlight and a short note for the client’s question. Finally, give the file a clear name, such as contract_client_review.pdf, and keep the unredacted original in a separate, private location.

If you annotate first and redact later, the redaction step flattens the pages and the notes become part of the picture. Plan the order so each step is applied once.

Questions people ask

Can I use a black highlighter to hide text? A highlighter or rectangle changes only appearance. Anyone can still select, copy or search the text underneath unless the page has been rasterized.

Is flattening the same as redacting? No. Flattening a form turns field values into page content. Redaction removes content. A flattened form still contains every answer.

Can I redact one word everywhere automatically? Redaction here is manual: you mark each region. After marking, search for the words in the result to catch anything you missed.

Will someone be able to tell what was redacted? They can see that something was covered and roughly how large it was. If length itself is sensitive, use a box larger than the text.

Keeping originals and naming versions

Whichever of the three actions you choose, protect yourself with a simple naming habit. Keep the untouched original as contract_original.pdf, never overwrite it, and write the action into the new filename: contract_edited.pdf, contract_annotated.pdf, contract_redacted.pdf. When you send a file, send the one named for what it is. This avoids the common mistake of attaching the unredacted file because both look alike in a crowded downloads folder.

For anything that matters, also keep a short note of what you changed and why: “changed delivery date from 12 March to 19 March at client request; redacted bank details on pages 2 and 7”. If someone later asks what was different about the version they received, the answer takes seconds instead of a comparison exercise, and the Compare PDF tool can confirm it if needed.