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.

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

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.

Are tools on Zeugly available offline?

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.

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

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.

Does Zeugly collect or store any personal data or files?

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.

What is Zeugly's cookie policy regarding Google AdSense?

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.

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

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.

Are generated passwords and UUIDs cryptographically secure?

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.

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

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.

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

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.

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

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.

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

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.

Browser-based Utilities

Privacy-First Developer & Utility Tools

A suite of essential tools that run 100% client-side. Your data never leaves your computer — no server tracking, no logs, complete security.

Zeugly

Privacy-First Developer & Utility Tools

QR Code Inspector

QR Code Generator

Bulk QR Generator

Barcode Generator

App Screenshot Studio

Open Graph Image Generator

Image Resizer Studio

Image Cropper & Rotator

Image Format Converter

Convert to WebP

Convert to PNG

Convert to JPG

Convert to GIF

Convert to BMP

Convert to ICO Favicon

Convert to TIFF

Convert to TGA

Convert to SVG

Convert to EPS

Convert to HDR/EXR

Convert to WBMP

Image Watermark Tool

Image Color Picker

SVG Vectorizer

SVG Optimizer

SVG to PNG / JPG Converter

Image File Size Compressor

Image Rotator & Mirror Flipper

EXIF & Location Metadata Cleaner

Image Color Filters & Photo Effects

Blur Image

Pixelate Image

Image to Base64

Accessible Color Checker

Online Text Editor

Text Diff Viewer

Text Case Converter

Secure Password Generator

Lorem Ipsum Generator

Markdown Previewer

CSV Viewer

CSV Merger

CSV Sorter

CSV Splitter

CSV Deduplicator

Word Counter

Character Counter

Line Counter

Reading Time Estimator

Sort Lines

Reverse Text

Shuffle Lines

Remove Duplicate Lines

Remove Empty Lines

Slug Generator

PDF Tools & Converter

PDF Splitter & Extractor

PDF Compress

PDF Rotate

PDF Organize

PDF Crop

PDF to Grayscale

PDF Metadata Viewer

PDF Metadata Editor

PDF Metadata Remover

PDF Page Counter

PDF Thumbnail Viewer

PDF Watermark

PDF OCR Text Extractor

JSON Formatter & Inspector

JWT Decoder & Inspector

Base64 Encoder / Decoder

URL Encoder / Decoder

CSV ↔ JSON Converter

XML ↔ JSON Converter

UUID / GUID Generator

Hash & Checksum Generator

Cron Schedule Descriptor