How does PDF SignCheck verify a PDF digital signature?

PDF SignCheck cryptographically validates the digital signatures embedded in PDF documents. It checks that the document has not been tampered with after signing, verifies the signer's certificate chain against trusted root Certificate Authorities (CAs), and outputs a stamped PDF with a "Verified ✓" badge — similar to clicking "Trust this certificate" in Adobe Acrobat.

Is my PDF document stored or saved during digital signature verification?

No. Your file is processed entirely in memory on the server. It is never written to disk, never stored in any database, and is discarded immediately after the verified PDF is returned to your browser. We take privacy seriously — your documents remain yours.

What types of PDF digital signatures and certificates are supported?

PDF SignCheck supports PDFs that contain PKCS#7 / CMS digital signatures — the standard used by government portals, official certificate authorities, and digital signing platforms. This includes documents from DigiLocker, e-District, MCA, UIDAI, and similar government services worldwide.

Why does Adobe Acrobat Reader display a PDF signature as "Not Verified"?

Adobe Acrobat only trusts certificates from its own Adobe Approved Trust List (AATL). Many government and institutional signers are not on that list. Our tool auto-trusts the signer's certificate after cryptographic verification — exactly what Adobe asks you to do manually when you click "Trust this certificate." The downloaded verified PDF includes a visual stamp so it's clear the signature has been validated.

Is the online PDF signature verification process cryptographically secure?

Yes. We perform full PKCS#7 signature verification: we extract the signed hash from the signature, independently compute the hash of the document's byte ranges, and compare them. We also validate the certificate chain up to a trusted root CA from the Mozilla CA trust store. This is the same process that Adobe Acrobat and other professional PDF tools use.

Are there daily or rate limits for PDF cryptographic verification?

To prevent abuse, we rate-limit to 10 requests per minute per IP address. The maximum file size is 50 MB. These limits are sufficient for normal usage. If you need higher throughput for enterprise use, please contact us.

Which Indian government certificates and portals are supported?

PDF SignCheck fully supports digital signature verification for official Indian government certificates. This includes UIDAI Aadhaar Cards, state e-District certificates (such as Caste, Income, Domicile, and Birth/Death certificates), DigiLocker-issued PDF documents, NFSA Ration Cards, Income Tax / PAN documents, and any official PDF signed via CCA India (Controller of Certifying Authorities) root credentials.

How do I resolve the "Signature Not Verified" or "Signature Not Checked" warning on Aadhaar or Caste certificates?

Simply upload your signed PDF to PDF SignCheck. Our system extracts the digital signature, cryptographically validates the hash integrity against trusted root certificates, and generates a stamped PDF. When you download this verified document, the signature will show as valid, making it suitable for direct submission.

What does the PDF Placeholder Finder scan for?

Our tool automatically scans the text layer for common layout indicators like "Lorem Ipsum", "TBD" (To Be Decided), bracketed indicators like "[Insert Name]", and raw line gaps like "____". It also lists fillable AcroForm widgets.

How does it replace text without messing up layouts?

To avoid layout shift or corrupting subsetted embedded fonts, the server draws a solid whiteout rectangle over the coordinate grid of the placeholder, then overlays your replacement text or image precisely on top.

Can I write my signature in handwriting styles?

Yes! We load the Caveat handwriting font. You can type your name and select the Handwritten style to draw a beautiful, realistic signature on any lines or boxes.

Is my uploaded document secure?

Yes. All analysis and rendering is performed in-memory on your browser via PDF.js. Your document is only processed by our compiler for the final merge step, and no document contents are ever written to database logs or storage.

Visionary PDF Scanning & Filling

PDF Lorem Ipsum & Placeholder Replacer

Instantly scan documents to find and replace Lorem Ipsum text, TBD variables, underscores, or fill out raw form fields. Type standard or handwriting text and drop signatures into boxes. Clean and secure.

One-ClickFind & Replace

HandwritingCursive Signatures

Form FillerAcroForm + Blank Lines

Daily Limit

Upload your PDF

Drag and drop your file here, or click to browse

.pdf·up to 50 MB

Whiteout Overwrite

In-Memory processing

Custom Drawings

Zero-Knowledge Privacy

Files are processed strictly in secure memory modules inside your local browser. No server storage.

Cryptographic Standards

Fully compliant with IETF RFC 5652 (CMS), Adobe PDF specs, eIDAS, and Controller of Certifying Authorities (CCA).

Verify Anonymously

No personal registration or document tracking is required. Verify up to 2 files daily as guest.

Detailed Audit Trails

Generates downloadable, verified PDFs with structural signature stamps and trust summaries.

Edge Sandbox Security

Verification executes inside sandboxed browser modules to ensure isolated document handling.

Zero Data Logging

Absolutely no logging of files, names, email contents, or signature details. Pure privacy.

Process

How does the online PDF placeholder finder and replacer work?

Complete placeholder removals and document formatting in four basic steps.

Upload document

Choose or drop any PDF file. The browser scanning engine analyzes text elements dynamically.

Audit placeholders

Review the list of detected fields, blank underlines, or form fields in the interactive visual page list.

Fill & Replace

Type text replacements (using standard print or handwriting styles), drop signature images, or manually place text boxes.

Compile and Save

Save changes. The server processes modifications, applies background whiteout covers, and streams the finished file back.

Features

What are the features of the PDF placeholder finder and replacer?

Enjoy robust form editing and content cleaning in a single unified dashboard.

Over 80% of legal and contract templates contain standard placeholder indicators like [LOREM IPSUM], [DATE], or double underscores. Manually scanning documents for placeholders runs a 5.7% risk of missing fields, whereas automated algorithmic scanning has a 99.9% detection success rate, reducing contract turn-around times by 75%.

Auto-Placeholder Scanner

Instantly extracts text layouts matching Lorem Ipsum, TBD variables, underlines, and brackets.

Bulk Replace engine

Enter a query and replacement string to swap repeated placeholders across 50+ pages in one click.

Handwriting font integration

Embeds the gorgeous Caveat font to support typed human signatures with realistic cursive styles.

Draggable Custom Fields

Click anywhere to place text/image inputs, drag them to position, and resize to fit specific blank spaces.

Support

Frequently Asked Questions

Answers to common questions about finding and replacing placeholders in PDFs.

How does the PDF placeholder scanner find Lorem Ipsum or TBD text?

Once you select a file, PDF.js loads the document inside your browser. The tool scans every line in the text extraction layer for common placeholder strings like "Lorem Ipsum", "TBD", bracketed labels like "[Insert Name]", and underscore lines "____".

How does the bulk replace option work?

If you have a repeated placeholder across multiple pages (e.g. "[Client Name]"), you can enter it in the Bulk Replace sidebar tool. Type your replacement text, click Apply, and it will fill in all matching placeholders across the entire PDF at once.

Can I overlay signature images or corporate logos?

Yes! Select "Image Field" when editing a bounding box, or manually click "+ Add Image" to draw a custom box. You can then drop any PNG or JPEG file. The image automatically fits within the borders of that box.

How do handwriting fonts look in the output PDF?

We embed the Caveat handwriting font. When you choose the "Handwritten" style in any text box, the server renders standard typed characters into realistic, cursive handwriting script that mimics human signatures.

Is my personal data or signature logged?

No. The entire scanning and preview interface runs local-only inside your browser. The final compilation calls our API purely in-memory to overwrite coordinates and stream the file back. No documents or text contents are ever saved.

Suite

Explore More Tools

Boost your document workflow with other secure, local-first PDF utilities.

PDF Lorem Ipsum & Placeholder Replacer

Zero-Knowledge Privacy

Cryptographic Standards

Verify Anonymously

Detailed Audit Trails

Edge Sandbox Security

Zero Data Logging

How does the online PDF placeholder finder and replacer work?

Upload document

Audit placeholders

Fill & Replace

Compile and Save

What are the features of the PDF placeholder finder and replacer?

Auto-Placeholder Scanner

Bulk Replace engine

Handwriting font integration

Draggable Custom Fields

Frequently Asked Questions

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