Frequently Asked Questions

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.