Certify PDF
Stamp any PDF with a SHA-256 fingerprint and a scannable QR code — a tamper-evident certificate anyone can independently verify.
Upload a PDF to certify
We'll compute a SHA-256 fingerprint and stamp a QR-coded certificate page.
PDF Certify
Appends a tamper-evident certificate page containing a SHA-256 fingerprint and a scannable QR code — a self-serve way to prove a document hasn't been altered since it was fingerprinted.
About the Certify PDF Engine
Create a tamper-evident record for an important PDF without uploading it to a third party. iCreatePDF calculates a SHA-256 fingerprint and adds a QR-enabled certificate, making it easy to identify whether a later copy is the same file you certified.
Zero-Server Privacy Architecture
Unlike conventional web utilities that transmit your files to cloud processing clusters, iCreatePDF executes certify pdf completely client-side. WebAssembly modules and local JavaScript engines handle all parsing, layout calculation, rendering, and file encoding inside your browser sandboxed memory buffer. Your files never cross network boundaries.
How to Certify PDF Step-by-Step
- 1
Add the PDF
Choose the document you want to fingerprint. It stays in your browser.
- 2
Create the certificate
Generate a SHA-256 fingerprint and the accompanying QR-enabled proof.
- 3
Save the certified copy
Download the marked PDF and retain the fingerprint for future checks.
- 4
Verify a later copy
Compare a file against its fingerprint to check whether its contents have changed.
Technical Specifications & Engine Details
| Specification | Implementation Standard |
|---|---|
| Processing Environment | 100% Client-Side WebAssembly (WASM) & HTML5 Canvas |
| Network Security | Zero Server Uploads (0 Bytes Transmitted) |
| PDF Compliance | ISO 32000-1 / ISO 32000-2 Specification Standards |
| File Size & Page Limits | Unlimited (Bounded only by client RAM capacity) |
| Cross-Platform Support | Google Chrome, Apple Safari, Mozilla Firefox, Microsoft Edge (Desktop & Mobile) |
| Pricing & License | 100% Free Forever (No Paywall / No Registration) |
Practical Use Cases & Workflows
- Document a final contract before sharing it
- Create an integrity record for a report or certificate
- Check whether a received PDF matches an approved copy
- Keep a verifiable record without sending a file to a server
Frequently Asked Questions
Q: What does a SHA-256 PDF fingerprint do?
It creates a unique cryptographic digest for the exact file contents. If the file changes, its fingerprint changes too.
Q: Does certification make a legal notarization?
No. It provides a tamper-evident integrity record; it does not replace a legal notary or qualified digital signature.
Q: Is the PDF uploaded?
No. Fingerprinting and certificate creation run locally in your browser.
Editorial Quality & Fact-Checking Standard
Verified by Barath R · Lead Software Engineer & iCreatePDF Technical Team
This technical documentation and interactive utility guide is published in compliance with Google Publisher Quality Guidelines, E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) principles, and web accessibility standards. For policy questions, visit our AdSense Policy page or Privacy Policy.