Guides & How-To Articles
Practical, step-by-step guides for everyday tasks — compressing files, working out loan EMIs and SIP returns, writing for SEO and more. Every guide links to a free tool so you can do it right away, privately in your browser.
Utilities
bcrypt vs Argon2id vs scrypt: Which Password Hashing Algorithm Should You Use?
Compare Argon2id, scrypt, and bcrypt using OWASP rules. Learn memory hardness, the 72-byte limit, benchmarks, and safe migration.
Read guideUUID v4 vs UUID v7: Which Unique Identifier Should You Use for Database Keys?
Compare UUID v4 and v7 under RFC 9562. Learn bit layouts, time-ordering, B-tree index locality, and database primary key rules.
Read guideBcrypt Password Hashing Explained: Cost Factors, Salts & Architecture
Learn how bcrypt password hashing works: the 72-byte limit, 2^cost rounds, salt format and OWASP guidance. Test hashes with our free tool.
Read guidePassword Security: Generate and Store High-Entropy Cryptographic Keys Safely
Learn how to generate cryptographically secure passwords. Understand entropy rules, generator safety, and how to avoid server logging risks.
Read guideImages
Photo and Signature Size for Online Forms: Requirements and Compression Guide
Photo and signature size guide for SSC, UPSC, and IBPS online forms. Learn pixel limits, file size rules, and how to compress under 50 KB.
Read guideImage Optimization: Compress Images Without Degrading Visual Quality
Understand lossy vs lossless image compression. Learn how to optimize JPG, PNG, and WebP images locally for high speed and visual fidelity.
Read guideBase64 Encoding Explained: Structure, Encoding Process & Web Use Cases
Learn how Base64 encoding translates binary data to ASCII, and how developers embed images and assets inline in CSS and HTML.
Read guideImage Compression for the Web: Formats, Quality & Performance
Learn how image compression works. Understand lossy vs lossless methods and how to optimize JPG, PNG, and WebP files for web performance.
Read guidePDF Document Optimization: Compression Techniques & Security
Complete guide to PDF document compression. Learn how stream repacking, font subsetting, and object removal reduce PDF file size safely.
Read guideFinance
Credit Card Interest in India: How It Is Calculated and the Minimum Due Trap
How credit card interest is charged in India and why minimum due takes years. Learn RBI rules, APR math, and worked payoff examples.
Read guideFD vs RD: Which Earns More Interest and When Should You Choose Each?
Compare FD vs RD: see exact interest formulas, worked ₹1.2 Lakh example, compounding differences, and DICGC bank deposit insurance.
Read guideGST on Services in India: Current Slabs, SAC Codes & Invoicing Rules
Complete guide to GST on services in India. Learn SAC codes, hotel slabs, CGST/SGST rules, and invoicing with worked calculation examples.
Read guideHome Loan Prepayment: Should You Reduce EMI or Loan Tenure?
Prepaying your home loan? Compare reducing EMI vs reducing tenure. See worked ₹30 Lakh example, interest saved, and RBI rules.
Read guideHow to Calculate Loan EMI: Mathematical Formula & Worked Example
Learn how to calculate loan EMI using the mathematical formula. Includes worked ₹10 Lakh example, 3-month table, and Excel PMT formula.
Read guideHow to Calculate Net Worth: The Complete Step-by-Step Guide
Learn how to calculate net worth with a clear formula. Balance assets vs debt, check official age benchmarks, and track wealth in privacy.
Read guideHow to Use the Zynocode GST Calculator: step-by-step tool guide
Learn how to use the GST Calculator to compute tax-inclusive and tax-exclusive rates, CGST/SGST/IGST splits, and invoice breakdowns.
Read guideMutual Fund Strategy: SIP vs Lumpsum Compounding, Risk & Return Comparison
Compare SIP vs Lumpsum investing. Understand compounding, rupee cost averaging, risk profiles, and how to choose the right strategy.
Read guideIndia GST Guide: Slabs, Mathematical Formulas, CGST/SGST Splits & Input Tax Credit
Complete GST calculation guide for India. Learn differences between CGST, SGST, IGST, and the exact formulas for adding and removing tax.
Read guideDeveloper
JWT Structure Explained: Header, Payload, Signature & Security Rules
Understand JWT structure (RFC 7519): base64url, registered claims, HS256 vs RS256, signature pitfalls, and safe decoding rules.
Read guideMD5 vs SHA-256: Differences, Collision Vulnerabilities & Modern Security Rules
Compare MD5 and SHA-256: RFC 6151 collision flaws, digest sizes, preimage rules, and when non-security checksums remain acceptable.
Read guideJSON Best Practices: Formatting, Validation & Optimization
Learn standard JSON conventions, syntax rules, common errors, and best practices for configuring API payloads and configuration files.
Read guideRegular Expressions Guide: Syntax, Validation & Testing
Learn regular expressions (regex). Syntax, capture groups, lazy matching, flags, and common validation patterns for email, phone, and password.
Read guideWriting
Listen to Text: How to Proofread Writing and Study by Ear
Listen to text read aloud to catch subtle typos, fix flow, and study. Test local browser voices with rate and pitch controls on your device.
Read guideMeta Description Length Guide: Ideal Characters, Pixels & High-CTR Templates
Learn the ideal meta description length in characters and pixels to avoid Google truncation. Preview snippets with our free SERP Preview Tool.
Read guideMarkdown Cheat Sheet: Syntax, Tables, and Live Preview Guide
Markdown cheat sheet covering CommonMark and GFM rules. Copy syntax for tables, code blocks, and lists, and preview your notes in real time.
Read guidePassive Voice Examples: How to Spot and Convert Passive Sentences
Explore 20 passive voice examples with active rewrites. Learn how to spot passive sentences, when to use them, and audit text in privacy.
Read guideFlesch Reading Ease Explained: Formulas, Score Meaning & Charts
Learn Flesch Reading Ease formulas with worked examples. Check score bands, grade targets, and simple tips to polish text in privacy.
Read guideSEO Title Tag Length Guide: How to Craft Click-Worthy Google Titles
Learn the ideal title tag length in characters and pixels to prevent Google truncation. Optimize your headlines using our free SEO Title Checker.
Read guideUTM Parameters Guide: How to Track Campaigns in Google Analytics 4
Master UTM parameters for GA4. Explore naming rules, real channel examples, reporting tips, and build clean campaign links in privacy.
Read guideWhat Is Keyword Density? Complete Formula, Examples & SEO Guide
Learn what keyword density is, how to calculate it, why Google penalizes keyword stuffing, and how to check your text with a free tool.
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