Question 1

What is Zeugly?

Accepted Answer

Zeugly is a free, privacy-first web utility toolkit and developer sandbox. It offers over 95+ browser-based tools to format JSON, decode JWTs, resize images, generate OG preview cards, create secure passwords, convert timestamps, analyze cron expressions, minify SVGs, and inspect QR codes safely. Every action runs 100% client-side in your local browser.

Question 2

Do I need an account or subscription to use the tools?

Accepted Answer

No. All tools on Zeugly are 100% free with no sign-ups, no registration, no subscriptions, and no usage limits. You can open any tool, complete your work, and close the tab anytime.

Question 3

Are tools on Zeugly available offline?

Accepted Answer

Yes. Once the web application loads in your browser, all processing scripts and tool logics run locally. You can continue using tools like JSON Formatter, Base64 Encoder, Password Generator, and Image Resizer even if your internet connection drops.

Question 4

How do client-side utility tools keep my data safe?

Accepted Answer

Unlike traditional online converters that upload your code, confidential files, or text to remote cloud servers, Zeugly uses native browser APIs (such as Web Crypto API, Canvas API, and FileReader). Your inputs are parsed and processed in your local browser memory, ensuring your code, passwords, JWT tokens, and images never leave your machine.

Question 5

Does Zeugly collect or store any personal data or files?

Accepted Answer

No. We operate under a strict zero-data collection rule. We have zero backend user databases, zero file storage servers, and zero data tracking scripts. We never ask for or store names, mobile/phone numbers, or physical addresses.

Question 6

What is Zeugly's cookie policy regarding Google AdSense?

Accepted Answer

We use third-party advertising partners, including Google AdSense, to serve non-intrusive advertisements. Third-party vendors use cookies to serve ads based on prior web visits. Users can opt out of personalized advertising by visiting Google Ads Settings or www.aboutads.info.

Question 7

How does client-side JSON formatting and JWT decoding work?

Accepted Answer

When you paste JSON or JWT strings into our developer tools, JavaScript running inside your web browser parses the payload in memory. Syntax validation, formatting, and JWT claim extractions happen instantaneously without sending any tokens or data payloads across the network.

Question 8

Are generated passwords and UUIDs cryptographically secure?

Accepted Answer

Yes. Our password generator and UUID v4 creator use hardware-backed operating system entropy via window.crypto.getRandomValues(). Seeds are generated strictly in your local device CPU.

Question 9

Can I resize images, create OG cards, or add watermarks without uploading them to a server?

Accepted Answer

Yes! Our image resizer, watermarking tool, OG image generator, SVG optimizer, vectorizer, and converter tools render images onto HTML5 Canvas elements inside your browser. Calculations and compression are performed locally on your device, and processed files are downloaded directly from your browser memory.

Question 10

What dimensions are used by the Open Graph (OG) Image Generator?

Accepted Answer

Our OG Image Generator renders at the standard 1200 x 630 pixels (1.91:1 ratio), optimized for Facebook, Twitter Cards, LinkedIn, Slack, and Discord link previews.

Question 11

What is QR Code Phishing (Qishing) and how does Zeugly detect it?

Accepted Answer

Qishing is a social engineering attack where malicious actors replace legitimate QR codes with malicious stickers pointing to spoofed websites. Zeugly allows you to safely scan digital files or live camera streams, evaluating destination URLs for SSL encryption, phishing keywords, known link shorteners, and suspicious query parameters before you visit them.

Question 12

Why is client-side QR scanning safer than traditional online scanners?

Accepted Answer

Most web-based QR scanners stream camera feeds or parsed URLs to backend servers, creating logs of scanned locations and links. Zeugly decodes QR codes entirely in your browser using WebAssembly and jsQR/ZXing engines, keeping your camera stream and URLs private.

Zeugly

HMAC Signature Generator (WebCrypto)

How to Use HMAC Generator

Enter Secret Key

Enter Message Payload

Select Algorithm

Key Features & Capabilities

Frequently Asked Questions

Experiencing an issue with HMAC Generator?