Redact PDF — Permanently Remove Content From a Page
Drag a box over anything that must not survive. The content underneath is destroyed rather than covered, and the document never leaves your browser.
Drag a box over anything that must not survive. The content underneath is destroyed rather than covered, and the document never leaves your browser.
How It Works in 4 Simple Steps
Execute your document workflow seamlessly in seconds with complete client-side data privacy.
Choose the document. Its pages are rendered locally so you can see what you are covering.
Draw a box across each name, figure or paragraph that must not survive.
Marked pages are rebuilt from pixels, so the covered text stops existing in the file.
Save the new document. Metadata is stripped on the way out.
100% Client-Side
Files never leave your browser RAM. Zero network transmission.
Zero Server Logs
No documents, filenames, or metadata are stored or tracked.
Lightning Fast
Instant processing with zero upload queues or download delays.
Why a Black Rectangle Is Not a Redaction
The most common way people redact a PDF is the one that does not work: draw a black rectangle over the sensitive line and save. The rectangle is a drawing instruction added on top of the page. The text underneath is untouched — still selectable, still copyable, still returned by any extraction tool, and still sitting in the file for anyone who opens it in something other than a viewer.
This is not a theoretical failure. It is the mechanism behind repeated public incidents in which court filings and government documents were published with "redacted" passages that could be recovered by selecting the text and pasting it elsewhere.
Removing content means the content has to stop existing. PDFCore does that by rebuilding every page you mark: the page is rendered to pixels, your boxes are painted onto those pixels, and only the resulting image is written into the new document. There is no text object left underneath, because there is no text layer left on that page at all.
| Dimension | Black box drawn over text | PDFCore redaction |
|---|---|---|
| Text under the box | Still there — selectable and copyable | Gone — the page is rebuilt without it |
| Survives copy and paste | Yes | Nothing to copy |
| Survives text extraction | Yes | No |
| Cost | None — and no protection either | Redacted pages become images |
Common Real-World Use Cases
Where removing content — not covering it — is the requirement.
Disclosure & Court Filings
Remove privileged passages from a document before it is filed or produced, where a recoverable rectangle would be a disclosure.
Records Shared With Third Parties
Take patient names, account numbers or addresses out of a record before it goes to an insurer, auditor or contractor.
Documents Being Published
Publish a contract or report with commercial terms genuinely removed rather than visually covered.
Anything Too Sensitive to Upload
The document that needs redacting is the one you least want on someone else's server. This one never leaves your machine.
Technical Specifications & Architecture
Detailed performance parameters, supported specifications, and privacy engineering guarantees.
| Technical Engine Parameters | |
|---|---|
| What Is Destroyed | All text, vectors and images under a marked box, plus annotations and form fields on that page |
| Execution | 100% Local In-Memory Scrubbing |
Important Note & Best Practices: Scrubbing metadata removes document properties; visible text content is unaltered.
What This Removes, and What It Costs You
The trade is honest and worth stating before you rely on it. A page you redact becomes an image. Its remaining text is no longer selectable, searchable or reachable by a screen reader, and the file grows. Pages you do not mark are copied through untouched and keep their real text, which is why marking only what you need matters.
Document metadata — author, title, producer — is cleared on the way out, because a redacted document that still names the person who wrote it has only moved the leak. Annotations and form fields on redacted pages do not survive the rebuild either, which is usually what you want in a document being disclosed.
Two things this cannot do for you. It does not find sensitive content — you decide what to cover, and anything you miss stays in the file. And it produces a new document: the original on your disk is unchanged, so a redacted copy is only safe to send if you send the copy.
| Field or location | After sanitising |
|---|---|
| Title, Author, Subject, Keywords, Creator | Empty — verified by reading the document back. |
XMP metadata stream (catalog /Metadata) |
Deleted. |
| Original author string in raw file bytes | Absent. |
| Producer | Rewritten by the PDF library on save, so it names the library. It cannot be left blank. |
| Not covered | Annotation authorship, embedded file attachments, and EXIF inside embedded images. |
Frequently Asked Questions
Everything you need to know about redacting a PDF with PDFCore Studio.
Does this actually remove the text, or just cover it?
It removes it. Any page you mark is rendered to pixels, your boxes are painted onto those pixels, and only that image is written into the new PDF. There is no text object left underneath — nothing to select, copy or extract. Drawing a rectangle in a PDF viewer does the opposite: it leaves every character in the file.
What is the catch?
Redacted pages become images. The remaining text on those pages is no longer selectable, searchable or readable by a screen reader, and the file gets larger. Pages you do not mark are copied through untouched and keep their real text, so mark only what you need.
Will the redacted PDF still contain my name in its metadata?
No. Author, title, subject and keywords are cleared when the redacted file is written, because a document that still names its author has only moved the leak rather than closing it.
Does it find sensitive information for me?
No, and it does not pretend to. You decide what to cover. Anything you do not mark stays in the document, so read the whole file before you rely on the result.
Is my document uploaded to be redacted?
No. Rendering, painting and rebuilding all happen in your browser memory. This matters more here than anywhere else on the site: the document you need to redact is by definition the one you least want sitting on someone else’s server.
Does it change my original file?
No. It produces a new document and leaves the original on your disk untouched. Send the redacted copy, not the original — and check the copy before you send it.
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