Hide text in a PDF — for real

Covering text with a shape or a highlight only hides it on screen. Armadillo Scan takes the words out of the file, so they can't be copied, searched or uncovered.

Free for 7 days, then $14.99 once — no subscription. After the trial you can still add one document a day for free.

How it works

  1. Open the PDF in the web app or the iPhone app.
  2. Choose Redact and drag over the text you want hidden.
  3. Save. The marked areas are painted over and the text underneath is deleted from the page.
  4. Try to select or search the hidden words — they are no longer in the document.

Why Armadillo Scan

Removed, not covered

A black box in most editors is a separate layer; delete it and the text is back. Here there is nothing underneath.

Can't be undone by someone else

“Remove redaction” tricks only work on covered text. Text that is gone can't be brought back.

Private

The document is processed on your device; the unhidden original is never uploaded.

Rest of the page intact

Pages you don't touch keep their selectable, searchable text.

Questions

What does redacting a PDF mean?

Redacting means permanently removing private information, such as names or account numbers, before you share a document. Proper redaction deletes the text; simply covering it does not.

Can someone remove a redaction from a PDF?

Yes, if the text was only covered by a box or highlight: they can delete the box or copy the text underneath. A page redacted with Armadillo Scan no longer contains the text, so there is nothing to recover.

Does it cost anything?

All features are free for 7 days, then $14.99 once — no subscription. After the trial you can still add one document a day for free.

More things it does

Sign a PDF · Redact a PDF · Merge PDFs · Word to PDF · Receipt scanner · No-subscription scanner · Scan on iPhone