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Resources & guides

Guides, Explainers & Free Tools for India

36 original guides on finance, tax, business documents, developer basics, and image/PDF formats — plus a directory of all 119+ TekPulse tools, free and without signup.

Finance & Tax Guides 10 guides
Finance · 7 min How to Calculate EMI for Home, Car & Personal Loan Learn the EMI formula, understand amortization, and discover tips to reduce your loan interest. Tax · 8 min Old vs New Tax Regime: Which is Better for You in FY 2026-27? A complete comparison of old and new income tax regimes with examples to help you choose the right one. Updated for FY 2026-27. Investment · 7 min SIP vs Lump Sum Investment: Which Gives Better Returns? Understand the power of SIP and when lump sum makes more sense for your mutual fund investments. Tax · 8 min GST Guide for Small Businesses in India Everything a small business owner needs to know about GST registration, filing, and compliance. Tax · 7 min HRA Exemption Calculation: How to Save Maximum Tax on Rent Step-by-step guide to calculating HRA exemption under Section 10(13A) with examples for metro and non-metro cities. Finance · 7 min Compound Interest Explained: The Secret to Growing Wealth in India Understand compound interest with real examples — how PPF, FD, and SIP use compounding to grow your money. Finance · 7 min How to Calculate Your Electricity Bill in India (State-wise Slabs) Understand electricity tariff slabs, fixed charges, and how to calculate your monthly BESCOM, MSEB, or TNEB bill. Finance · 7 min FD vs RD — Which Should You Choose? Fixed Deposit or Recurring Deposit? Compare how each works, how they're taxed, and which one actually fits your situation. Finance · 6 min How Gratuity Is Calculated in India The Payment of Gratuity Act formula explained — eligibility, rounding rules, and how much of your gratuity is actually tax-free. Tax · 6 min GST Inclusive vs Exclusive Price — What's the Difference? How GST-inclusive and GST-exclusive pricing work, the math to convert between them, and when businesses use each — updated for the GST 2.0 5/18/40 slabs.
Developer Guides 10 guides
Security · 7 min How to Create Strong Passwords: A Cyber Security Guide for Indians Learn what makes a password secure, how hackers crack weak passwords, and best practices for 2024. Developer · 6 min Online Code Compiler: Run Python, Java, C++ and 40+ Languages Free How to run code online without installing anything — useful for students, interviews, and quick testing. Developer · 6 min JSON Formatter and Validator: A Complete Guide for Developers Learn what JSON is, common JSON errors, how to format and validate JSON data, and useful tools for developers. Developer · 6 min .gitignore Mistakes That Leak API Keys (and How to Avoid Them) A missing .gitignore rule is one of the most common ways API keys and passwords end up exposed on GitHub. Here's how it happens and how to prevent it. Developer · 8 min How JWT (JSON Web Tokens) Actually Work A clear breakdown of JWT structure, how signatures are verified, and the biggest misconception developers have about JWTs — that they're encrypted. They're not. Developer · 8 min JWT vs Session-Based Authentication — Which Should You Use? A balanced comparison of stateful sessions and stateless JWTs — scalability, revocation, storage, and the security tradeoffs that actually matter. Developer · 9 min Regex Basics: A Practical Introduction The core regex building blocks explained with real examples — matching emails, extracting phone numbers, and validating Indian PIN codes — instead of toy patterns. Developer · 7 min How Base64 Encoding Actually Works Base64 is encoding, not encryption — a mix-up that causes real security mistakes. Here's the 3-bytes-to-4-characters mechanism, why padding appears, and where Base64 is actually used. Developer · 7 min URL Encoding (Percent-Encoding) Explained Why URLs can't contain spaces and special characters directly, how percent-encoding works, and when to use encodeURIComponent vs encodeURI in JavaScript. Developer · 7 min UUID Explained: What It Is and When to Use One What a UUID actually is, the difference between v1, v4, and v5, the 8-4-4-4-12 format, and when a UUID beats an auto-increment integer ID.

Tool directory

TekPulse provides 119+ free online calculators and tools designed for India — covering finance, tax, health, developer utilities, and more.

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Media Converters 3 tools
Video Converter Audio Converter Video to GIF
Office Tools 2 tools
Word Editor Spreadsheet Editor
Text Tools 6 tools
Word Counter Case Converter Text Reverser Duplicate Remover Text Sorter Text Encryption
Unit Converters 2 tools
Unit Converter Currency Converter