Protect a PDF from Editing: What PDFcraft Can and Cannot Do
If your goal is to prevent edits after sharing, distinguish who may open a file from what they can do once it is open. PDFcraft provides password protection and visible text watermarks. Neither makes a document read-only or tamper-proof.
An opening password controls access
Protect PDF applies password-based AES-256 encryption. Its current configuration allows printing and extraction and uses the same supplied password for user and owner access. There is no permissions-only or disable-editing control. An authorized recipient may modify a document or produce an unprotected copy.
A watermark is a label, not proof of integrity
Watermark PDF adds text across every page. You can change the text and opacity; placement, angle, and size follow fixed implementation behavior. The tool does not authenticate the author, prove whether someone edited the file, or ensure a watermark cannot be removed.
Rasterization is not edit prevention
Turning a page into an image changes how its contents are represented. Images can still be modified, and the conversion can discard searchable text, links, forms, and other semantics. PDFcraft’s grayscale conversion is raster-based; it is not a security transformation or secure redaction tool.
Choose the control that matches your goal
For access control, use a password and share it thoughtfully. For a visible label, use a watermark. For a workflow that requires signing, approval history, or change verification, evaluate a dedicated system and its documented behavior. PDFcraft has no e-signature tool. Keep an original copy for comparison.
Available PDFcraft options
Local processing has its own limits
PDFcraft processes document contents locally in your browser without a PDF-processing upload backend. That does not mean the page makes no network requests: website resources load over the internet, and some tools download processing components. Advertising resources load after acceptance in the consent banner. Practical limits depend on browser support, device memory, and document complexity. Protect and Unlock download the qpdf WebAssembly runtime from jsDelivr. File contents and the supplied password are processed locally by the application. A blocked runtime download can prevent the operation from starting; loading this resource is separate from uploading a document.
Frequently asked questions
Does Protect PDF disable editing?
No. It adds password-based encryption, not a read-only or tamper-proof mechanism.
Can a watermark prove that nobody changed a document?
No. A visible text label is not cryptographic integrity verification.
Does deleting a sensitive page securely purge its content?
No. Delete Pages removes visible pages from the document structure; it is not secure redaction or sanitization.