Zero-Knowledge Security & Privacy Tools (Watermark, Password & Hashes)
Protect confidential documents, generate cryptographically secure passwords, verify HMAC webhooks, and remove photo geolocation metadata.
Kernel Entropy (Web Crypto)
Passwords and cryptographic salts generated using hardware-level system entropy.
True Zero-Knowledge Execution
No server logs, no database storage, and no network transmission of secret tokens or files.
GDPR Article 25 Compliant
Engineered from the ground up under Privacy by Design and Privacy by Default principles.
Overview & Client-Side Technical Architecture
In an era of recurring cloud data breaches and corporate tracking, true privacy means zero data transmission. DocSwift security utilities operate entirely within your browser local memory sandbox, ensuring that your secret keys, passwords, and sensitive documents never traverse the public internet.
Cryptographically Secure Random Number Generation
Many online password generators use insecure Math.random() functions that produce predictable pseudo-random sequences. DocSwift utilizes the browser Web Crypto API (crypto.getRandomValues), tapping into your operating system kernel entropy pool.
Generate high-entropy 32+ character passwords with customizable uppercase, numbers, and special symbols that resist brute-force and dictionary attacks.
Watermarking Confidential Intellectual Property
When sharing preliminary business plans, legal briefs, or confidential client proofs, stamping a traceable watermark (e.g., "CONFIDENTIAL - PROPERTY OF CLIENT") deters unauthorized leaks.
DocSwift applies vector-level watermark stamps directly into your PDF page streams in local memory, ensuring the underlying document never leaves your machine.
Available Client-Side Privacy & Security Suite (3 Tools)
Select any tool below to launch it instantly in your browser with zero configuration.
Protect PDF
Secure sensitive PDF contracts, financial statements, and ID documents with strong client-side encryption. Zero server storage.
Watermark PDF
Stamp watermarks on PDF files directly in your web browser. Customize opacity, angle, colors, and repeated tiles with 100% client-side privacy.
Webhook HMAC
Calculate and verify HMAC SHA-256, SHA-512, and SHA-1 webhook signatures for Stripe, GitHub, Shopify, and Slack using browser WebCrypto API.
Recommended Step-by-Step Guides
How to Combine Multiple PDFs Securely (Zero Server Uploads)
Protect confidential NDAs, invoices, and legal agreements when merging documents online.
How to Watermark a PDF Online with Custom Text and Stamps
Mark sensitive business plans, draft agreements, and exam papers with custom diagonal or repeated stamps.
How to Strip EXIF Metadata & GPS Coordinates from Photos Online
Prevent location leaks, camera serial reveals, and stalking risks by stripping embedded Exchangeable Image File format metadata directly in your browser.
The Math of Password Entropy: How to Generate Cryptographically Secure Passwords
Learn how bit-entropy protects against GPU brute-force attacks and why Math.random() is dangerous for password creation.
Client-Side Privacy & Security Suite FAQ
Can DocSwift recover my password if I lose it?
No. Because all generation is client-side and zero data is saved on our servers, we have no record of generated passwords or keys.
Which cryptographic hash algorithms are supported?
SHA-1, SHA-256, SHA-384, SHA-512, and MD5, computed using browser native crypto APIs.