Are DeckTools web utilities free and private?

Yes, 100%! All 60+ web utilities on DeckTools run locally inside your web browser using HTML5, JavaScript, and Web APIs. No data or file uploads ever leave your device.

Do I need to register or create an account to use DeckTools?

No sign-up or registration is required. You can access and use every calculator, converter, and developer tool instantly with zero latency.

Does DeckTools support Dark Mode and Light Mode?

Yes! DeckTools includes a dedicated theme switcher button in the top navigation bar, allowing you to toggle between Normal (Light) Mode and Dark Mode smoothly.

100% Client-Side · Dark & Light Mode · Zero Latency

DeckTools: 60+ Instant Client-Side Web Utilities

Calculators, converters, developer utilities, SEO helpers and document converters. Every tool executes directly in your browser — your data never leaves your device.

60+ Free Tools 0 Server Latency 100% Private Dark & Light Mode

🔥 Popular & Trending Tools

Finance

GST Calculator

Calculate Goods & Services Tax with separate CGST, SGST, and IGST breakdowns + currency toggles.

Open Tool → Developer

JSON Formatter & Validator

Format, beautify, validate and minify JSON strings with real-time error detection.

Open Tool → Finance

Mortgage / Home Loan EMI

Compute monthly loan EMI, total interest payable and amortization schedules.

Open Tool → Documents

Image Resizer & Compressor

Resize and compress images directly in your browser with local Canvas quality control.

Open Tool →

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Why Choose DeckTools?

⚡ ~0ms Instant Latency

Calculations and document conversions happen locally in your browser. No server queueing or network delay.

🔒 Complete Privacy

Your inputs, code, salary, health data, and files are processed strictly on your machine and never uploaded.

🌙 Dark & Light Themes

Switch seamlessly between Normal (Light) and Dark themes with full OS system preference auto-detection.

🛠️ 60+ Versatile Utilities

From GST and EMI calculators to JSON formatters, regex testers, image resizers, and PDF extractors.

Frequently Asked Questions

Yes! Every tool on DeckTools is 100% free to use without any hidden fees, subscriptions, or feature paywalls.

DeckTools is engineered purely as a static client-side web application. All calculations, parsing, and data transformations execute inside JavaScript running in your browser tab. We have no backend databases or tracking servers to store your data.

Simply click the theme toggle button located at the top right of the navigation header on any page. Your theme preference will automatically be saved for future visits.

General Website Disclaimer

DeckTools provides web utilities, calculators, and converters for educational, technical, and informational purposes. While we strive for maximum accuracy, tool outputs should be independently verified for official financial, tax, legal, or medical decisions.