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.

Image Converter - ICO Favicon

Convert to ICO Favicon

Convert your image to the ICO favicon format with this free online ICO conversion tool. The output ICO file contains multiple resolutions (16x16, 32x32, 48x48, 64x64, 128x128, 256x256) for full browser and OS compatibility. Perfect for website favicons and Windows application icons. Processing happens 100% in your browser.

How to Use Report Bug

Target Format

Quality / Compression90%

Color Effect / Filter

Background Fill Color

Fills transparent pixels

Resize Width (px)

Resize Height (px)

Maintain Aspect Ratio

Drag & Drop Image Files Here

Supports PNG, JPG, WebP, GIF, SVG, BMP, TIFF, TGA, WBMP, EPS, HDR, ICO & HEIC files

Step-by-Step Guide

How to Use ICO Image Converter

01Step 1

Select or Drag Image Files

Drag and drop image files (PNG, JPG, WebP, GIF, BMP, TIFF, SVG, etc.) onto the dropzone or click Browse Files.

02Step 2

Configure ICO Settings

Adjust compression quality, color filters, custom width/height dimensions, and background color fill options.

03Step 3

Client-Side Processing

Browser JavaScript converts your image files 100% locally in client memory with zero server uploads.

04Step 4

Download ICO Output

Click Download on individual converted files or export all converted files together as a single ZIP package.

Key Features & Capabilities

Batch conversion to ICO format
Quality & compression slider controls
Dimension resize with aspect ratio lock
Color filter effects (Grayscale, Sepia, Invert, Monochrome)
Transparent pixel background color fill
100% private client-side processing

Privacy & Security Guarantee

100% Client-Side Privacy: All operations occur locally in your web browser memory using JavaScript and WebAssembly. Your files, text payloads, and images are never uploaded to external servers or stored in cloud databases.

Processing Mode: 100% Offline ClientZero Server Telemetry

Frequently Asked Questions

View All Platform FAQs

How does online ICO conversion work without server uploads?

Conversion executes locally using standard HTML5 Canvas and WebAssembly encoders inside your web browser. Your original images never leave your computer.

Can I batch convert multiple files to ICO at once?

Yes. You can upload multiple image files simultaneously, adjust global settings, and download all converted files individually or as a ZIP archive.

Is there any file size or conversion limit?

There are no artificial file size limits or daily conversion caps. Processing speed depends entirely on your local device CPU memory.

Website Favicons & Windows ICO Icon Standards

What is the ICO Format?

ICO is an icon container format created by Microsoft for Windows desktop shortcuts, taskbars, and browser favicons. Uniquely, a single `.ico` file packages multiple embedded raster images at different square pixel dimensions (e.g. 16x16, 32x32, 48x48, 64x64, 128x128, 256x256) within one unified binary file.

Why Convert Images to ICO?

Convert logos, brand symbols, or app graphics to ICO to generate a compliant `favicon.ico` for website root directories, or to style desktop application executables (`.exe`) across Windows 10, Windows 11, and desktop environments.

ICO Favicon FAQs

Which resolutions are included in the generated ICO file?

Our converter builds a multi-resolution ICO file containing 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256 pixel layers to cover browser tab bars, bookmarks, desktop shortcuts, and high-DPI taskbar icons.

Where should I place favicon.ico on my website server?

Place `favicon.ico` in your site's root directory (e.g., `https://example.com/favicon.ico`) and reference it in your HTML head with <link rel="icon" href="/favicon.ico" />.

Does the ICO converter support transparent backgrounds?

Yes. If your source PNG or WebP image contains transparency, all embedded ICO resolution layers preserve 32-bit RGBA alpha channel transparency.

Experiencing an issue with Convert to ICO Favicon?

Notice a bug, calculation error, or unexpected result? Let us know.

Report Bug

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