Security / Sign PDF
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Sign PDF

Embed digital signatures or hand-drawn signature stamps.

Drop your document here

or or

Files up to 50 MB on Free and 500 MB with Pro · batches up to 100 files
Encrypted in transit and at rest - Automatically deleted within 24 hours
Security · privacy-first workflow

Sign a PDF for approval or integrity

Place a visible signature or apply a cryptographic document seal when a PDF needs an approval mark and verifiable integrity.

01

Upload the document to Sign PDF

Upload the document to Sign PDF

02

Choose visual stamp or digital signing

Choose visual stamp or digital signing

03

Verify the signature and download

Verify the signature and download

Zero-Upload Client Privacy Mode

For sign a pdf for approval or integrity, supported browser workflows can run locally with pdf-lib and WebAssembly so the source file never touches a server.

Built for practical PDF work

The sign a pdf for approval or integrity workflow keeps the relevant controls close to the upload queue so you can finish one document job without a heavyweight suite.

Transparent safety controls

Before you download sign a pdf for approval or integrity results, Paperplane validates the output and applies isolated storage, path containment, and lifecycle cleanup.

Why use Paperplane for sign a pdf for approval or integrity?

CapabilityPaperplaneTraditional desktop suites
Browser zero-upload processingSupportedUsually unavailable
Dedicated Security URLOne focused pageOne application shell
Installation requiredNo for web workflowsOften required

Frequently asked questions

What is the difference between a visual and digital PDF signature?

A visual signature is an appearance placed on the page. A digital signature uses certificate-backed cryptographic validation to detect changes after signing.

Does Paperplane provide a certificate authority?

No. Cryptographic signing requires an authorized certificate and key material. The application can create or verify supported signature structures but does not replace your trust provider.

Can I verify a signed PDF after downloading it?

Yes. Use the verification workflow to inspect signature status, byte ranges, and integrity information supported by the document.