PDF and Document ToolsFeatured Client-Side & Private

Sign PDF

Create and stamp electronic signatures on contracts, agreements, and PDF documents.

Click to upload file(s) or drag & drop here

Supports standard PDF documents (.pdf)

🔒 100% Client-side. Your files never touch external servers.

Draw Electronic Signature

Draw signature above. It will be stamped onto the bottom-right corner of the final page.

How to Use the Sign PDF

Enter your parameters: Type, paste, or select your input values above.
View instant results: Calculations update in real time as you change values.
Copy or export: Click copy, download, or print to use your results immediately.

About this Tool

Draw your signature with touch/mouse, type your initials, or upload a signature image and position it precisely on any PDF page.

Client-Side PDF Document Pipeline

In-Browser WebAssembly (Wasm) & pdf-lib Binary Stream Manipulation

PDFs are processed directly inside your browser memory sandbox using modern Web APIs. Document cross-reference tables are modified and written without transmitting binary streams to remote servers.

Worked Example: Local Document Processing Example

Input:

Two PDF contracts (1.8 MB and 2.4 MB) selected from local disk

Output:

Single merged 4.2 MB PDF document generated in under 1 second

All page tree references, fonts, and embedded image dictionaries are re-indexed locally on your machine.

Frequently Asked Questions

Does compressing a PDF reduce text sharpness or print quality?

No. Vector fonts, typography paths, and lines remain mathematically crisp. Compression primarily optimizes high-DPI raster scans and strips unreferenced metadata.

Are my confidential documents uploaded to any remote server?

No. Processing occurs entirely in your browser sandbox via WebAssembly and HTML5 File APIs. Your files never touch our servers.

What is the maximum PDF file size I can process?

Because processing runs in browser memory, files up to 200 MB are typically handled smoothly on modern desktops and laptops.

Calculation Standards

Compliant with ISO 32000-1 (PDF 1.7) and ISO 32000-2 (PDF 2.0) international document specifications. For tax, legal, or medical advice, consult certified professionals.

Related Practical Guide

How to Permanently Redact a PDF for Free (And Why Black Boxes Leak Data)↗

Drawing a black rectangle over sensitive text in standard PDF viewers leaves the text copyable beneath the box. Learn how true byte-level PDF redaction works, why major legal filings leak data, and how to permanently sanitize files in your browser.

Read tutorial →

How to Electronically Sign a PDF for Free (Without Printing or Paid Subscriptions)↗

Printing a contract just to sign it with ink and scan it back creates blurry documents and wasted time. Learn how electronic signatures are legally binding under US and EU law, and how to sign PDFs for free directly in your browser.

Read tutorial →