Verify PDF Signatures
Extract cryptographic certificate metadata and check file integrity post-signature.
Upload a signed PDF
Verify digital cryptographic certificates locally.
Verification
Verify the cryptographic identity and document integrity of signed PDFs client-side. Ensures the document hasn't been altered post-signature.
Private, Browser-Based Document Processing
Learn how we securely compile and edit your files directly inside your browser sandbox.
🔒Zero Server Uploads (100% Private)
Your privacy is our highest priority. Unlike conventional online PDF converters that upload your sensitive documents to remote cloud storage servers, iCreatePDF operates entirely inside your web browser's local sandbox. Your files are never transmitted across the network, ensuring absolute confidentiality for personal, legal, and financial documents.
âš¡Powered by Local WebAssembly
We leverage cutting-edge browser technologies, including WebAssembly (Wasm) compiles of professional document engines and HTML5 canvas APIs, to perform heavy-duty file operations directly on your device's CPU. This local execution model provides instant processing speeds while bypassing slow internet upload and download queues.
✨No Limits, No Watermarks, No Sign-Up
Enjoy fully unrestricted access to our entire PDF utility suite. We do not enforce file size caps, daily usage limits, page count restrictions, or registration prompts. All documents are output in pristine quality without added branding or watermarks, making it ideal for both personal and professional workflows.
🔌Full Offline Capabilities
Since all document rendering and processing logic runs client-side within your browser sandbox, the tools do not require an active internet connection to function. Once the tool page is loaded, you can safely disconnect your device and continue converting, merging, compressing, or editing files offline.
About the Verify PDF Signature Tool
A digitally signed PDF is only trustworthy if the signature and the document haven’t been tampered with since signing. iCreatePDF validates cryptographic signatures on a PDF locally, inspecting signer identity details and checking byte-range integrity without uploading the file to a validation service.
How to Verify PDF Signature
- 1
Upload the signed PDF
Add the document containing a digital signature to check.
- 2
Inspect the certificate
View signer identity details embedded in the signature.
- 3
Check document integrity
Verify the byte-range hash matches to confirm no tampering occurred.
- 4
Review the validation result
See a clear pass/fail result for the signature check.
Common Use Cases
- Confirm a received contract’s digital signature hasn’t been altered
- Verify the signer identity on a digitally signed legal document
- Check the integrity of a signed invoice before processing payment
- Validate a government or certificate-authority-issued signed PDF
Frequently Asked Questions
What does verifying a signature actually check?
It checks the cryptographic certificate details and confirms the document’s byte-range hash matches, which reveals whether the file was altered after signing.
Can I see who signed the document?
Yes, the signer’s certificate identity details are extracted and displayed as part of the verification.
Is the PDF uploaded to a server for validation?
No, signature and integrity checks are performed entirely inside your browser.
What happens if the document was tampered with?
The integrity check will fail, indicating the file has changed since it was signed.