Stories, guides
and updates
Tips, comparisons, and deep-dives from the team building stax.tools.
Diff Checker: What It Is, How It Works, and 6 Use Cases Beyond Code Review
A side-by-side comparison of diff algorithms, how unified and split diff formats work, why character-level diffs matter for text editing, and practical use cases for diff checkers outside of version control.
EPF vs NPS vs PPF: The Three-Way Retirement Comparison for Salaried Indians
Step-by-step comparison of EPF, NPS, and PPF — contributions, interest rates, lock-in, withdrawal rules, tax treatment at maturity, and how to combine all three for a robust retirement plan.
UTF-8, Unicode, and Character Encoding: What Every Developer Needs to Know
Why mojibake happens, how Unicode code points map to UTF-8 bytes, the difference between ASCII, Unicode, and UTF-8, and why 'just use UTF-8 everywhere' is correct advice but still requires understanding.
TDS on Rent Above ₹50,000: What Tenants Must Do Before the Deadline
Most tenants believe TDS on rent is the landlord's problem. It isn't. If you pay monthly rent above ₹50,000, the obligation to deduct, deposit, and file falls entirely on you — and the penalties for non-compliance are steep.
CSS Grid in 2026: Subgrid Is Everywhere — Here's How to Actually Use It
CSS Subgrid reached full cross-browser support in 2023 and is changing how developers build complex layouts. This guide covers the Grid fundamentals you need, how Subgrid solves the alignment problem, and when Grid beats Flexbox.
How Your CIBIL Score Is Calculated — and the 5 Factors That Actually Move It
FAQ-style explainer: what makes up a CIBIL TransUnion score, why it matters for home and personal loans, which behaviours increase it fastest, and what actually hurts it that most people don't know about.
JSON vs XML vs YAML: A Practical Guide to Choosing the Right Data Format
When should you use JSON, XML, or YAML? A scenario-first comparison covering syntax, use cases, performance, human readability, schema validation, and the one situation where each format wins.
NPS vs Mutual Funds for Retirement: Which Builds More Wealth in 2026?
Side-by-side comparison of NPS and mutual funds for long-term retirement investing — returns, tax benefits under 80CCD, lock-in, annuity obligation, withdrawal rules, and a verdict for different investor profiles.
How to Read and Write a Cron Expression: The Complete Guide
Step-by-step guide to understanding cron syntax — the five fields, special characters, common patterns, timezone pitfalls, and how to validate expressions before deploying.
URL Encoding Explained: Why Your Links Break and How Percent-Encoding Fixes Them
What percent-encoding actually is, which characters must be encoded in a URL and why, the difference between encodeURI and encodeURIComponent in JavaScript, and common bugs it causes in production.
How to Read an IP Address, Subnet Mask and CIDR Block (Without Being a Network Engineer)
FAQ-style explainer: what the four octets in an IP address mean, what /24 and /16 CIDR notation does, how to calculate broadcast address and usable host range, and when you need a subnet calculator.
Your SIP Return Is Not CAGR — Understanding XIRR and Why the Difference Is Larger Than You Think
Most mutual fund investors confuse fund NAV growth (CAGR) with their personal return (XIRR). For SIPs, the gap can be 3–5 percentage points. Here's the math, a worked example, and how to calculate your actual return in minutes.
CORS Errors Explained: Why Your Browser Blocks the Request (and the Exact Headers That Fix It)
A scenario-first walkthrough of how CORS works — why the Same-Origin Policy exists, what each CORS error message means, preflight requests explained, and exactly which server headers fix the problem.
ELSS vs PPF: Which Section 80C Option Actually Wins in FY2026-27?
With RBI cutting rates 50 bps in 2025–26 and PPF at 7.1%, the ELSS vs PPF calculus has shifted. Here's which ₹1.5 lakh 80C investment makes more sense now — with 10-year return data, lock-in comparison, and tax treatment side by side.
UUID vs ULID vs NanoID: Which Random ID Format Should You Use in 2026?
Side-by-side comparison of UUID v4, ULID, and NanoID — format, length, sortability, collision probability, database performance, and a decision guide for your next project.
How to Generate a Strong Password (And Why You Don't Need to Remember It)
What makes a password truly secure, how entropy works, why 'P@ssw0rd' is weaker than 'correct-horse-battery-staple', and how to use Stax's browser-based password generator and strength checker without your passwords ever leaving your device.
How to Create a QR Code for Any URL, WiFi, Contact, or WhatsApp Number — Entirely in Your Browser
Step-by-step guide to generating QR codes for URLs, WiFi networks, contacts, WhatsApp links, and plain text — no signup, no upload, no server. Everything encodes locally in your browser.
Capital Gains Tax on Mutual Funds FY2025-26: New Rates, the ₹1.25L Exemption, and How to File
Finance Act 2024 changed LTCG on equity funds to 12.5% and STCG to 20% from July 23, 2024. Here's exactly what rate applies to your gains, how to claim the ₹1.25 lakh exemption, and how to report in ITR-2 this season.
HDFC AMC Reports Cybersecurity Incident: What It Means for Your Mutual Fund Investments
HDFC AMC has disclosed a cybersecurity incident and activated containment protocols. Here's what happened, whether your mutual fund units are at risk, what data AMCs hold about you, and the exact steps to take right now.
Form 26AS vs AIS: How to Read, Match, and Fix Discrepancies Before Filing ITR
Most taxpayers file ITR using only Form 26AS — but the department already sees your savings interest, dividends, MF redemptions, and property deals via AIS. Here's how to read both, spot mismatches before July 31, and submit feedback when AIS is wrong.
Your 2008 Mutual Fund May Be Silently Bleeding Money — Here's What Happened and How to Fix It
Agents in 2008 enrolled investors in dividend payout plans, left wrong bank details, and misspelled names. 15–20 years later, lakhs sit in money market accounts earning 4% instead of 12%+. Full recovery guide.
Best Fixed Deposit Rates in India — May 2026: SBI, HDFC, ICICI, Small Finance Banks Compared
Bank FD rates are falling as the RBI cuts the repo rate. Here's where rates stand in May 2026, which banks still offer the best returns, and whether to lock in now before the next cut hits.
How to Convert Images to WebP Without Uploading: Complete Guide
WebP images are 25–35% smaller than JPG at the same visual quality. Here's how to convert entirely in your browser — no upload, no account, no file size limits — plus when WebP is the wrong choice.
How to File ITR Online for FY2025-26 (AY 2026-27): Step-by-Step Guide
ITR filing for FY2025-26 is open. Deadline: July 31, 2026. Here's exactly how to file online — which ITR form to choose, documents needed, regime selection, and common mistakes that trigger notices.
Base64 encoding explained: what it is, when to use it, and when not to
Base64 turns binary data into text so it can travel safely through text-only channels. Here's how it works, where it's used, and the mistakes developers commonly make with it.
What is a JWT? How to decode and verify JSON Web Tokens
JWT tokens are everywhere in modern web auth — but what's actually inside them? Learn to decode, read, and verify JWTs instantly without installing anything.
How to minify CSS and JavaScript without a build tool
You don't need Webpack, Vite, or a Node.js pipeline to minify CSS and JavaScript. Here's how to shrink your assets in the browser, on the command line, or inside your editor.
Old vs new tax regime: which one saves you more in FY2026-27?
The new tax regime is now the default in India — but it's not automatically better for everyone. Here's the exact break-even analysis to find out which regime saves you more.
Regex cheat sheet: the patterns every developer needs to know
A practical regex reference covering character classes, quantifiers, groups, lookaheads, and the 12 most useful patterns for everyday development — with live examples.
SHA-256 vs MD5: which hash algorithm should you use?
MD5 is everywhere — and broken for security. SHA-256 is the modern default. Here's what the difference actually means for your code, files, and passwords.
How to build a ₹1 crore corpus with SIP: a step-by-step 2026 guide
Building ₹1 crore through SIP is more achievable than most investors think. Here's exactly how much to invest, for how long, and which assumptions to stress-test before you commit.
Gold and Silver Import Duty Just Jumped to 15%: What Every Buyer, Investor, and SIP Holder Should Do Now
The government raised gold and silver import duty to 15% effective May 13, 2026 — up from 6%. Here's the real ₹ impact on jewellery, ETFs, and gold SIPs.
Sovereign Gold Bond Matures at 382%: What 2018 SGB Investors Are Taking Home in 2026
The SGB 2018-19 Series 1 matures in May 2026, delivering over 382% total returns to investors who bought at ₹3,114 in 2018. Here's the full calculation, the tax treatment, and whether gold as an asset class still makes sense for new investors.
April CPI Prints at 3.48%: What India's Borrowers and Savers Should Do Right Now
India's April retail inflation came in at 3.48% — well below the 4% RBI target. Here's the real ₹ impact on your home loan EMI, FD returns, and monthly fuel budget.
Home Loan Rates Fall to 7.10% in May 2026: Is Now the Right Time to Buy a House?
Home loan rates are at multi-year lows following the RBI's 125 bps rate cut cycle. Best rates now start at 7.10%. Here's what this means for affordability, whether to buy vs. rent, and how to get the best rate.
How to Merge PDFs Without Uploading Them Anywhere (2026 Guide)
Combine multiple PDFs into one — in your browser, without uploading them to any server. Works for invoices, contracts, bank statements, and scanned IDs.
New Income Tax Act 2025: ₹12 Lakh Zero Tax, 8-City HRA, and What Changed from April 2026
India's new Income Tax Act 2025 is live from April 1, 2026. Here's what actually changed: the ₹12 lakh threshold, expanded HRA cities, doubled senior citizen deductions, and how to calculate whether old or new regime saves you more.
PNG vs JPG vs WebP vs AVIF: Which Image Format Should You Use in 2026?
A practical 2026 guide to choosing between PNG, JPG, WebP, and AVIF — with file-size benchmarks, browser support, and when each one wins.
RBI Cuts Repo Rate to 5.25%: What It Means for Your Home Loan EMI in 2026
The RBI has cut the repo rate by 125 basis points since 2025, bringing it to 5.25%. Here's the exact rupee impact on your home loan, car loan, and personal loan EMIs — and whether you should switch lenders.
CII Wants the ₹10 Fuel Excise Cut Rolled Back: What It Means for Your Petrol Bill
The Confederation of Indian Industry has proposed a gradual rollback of the ₹10/litre fuel excise reduction. Here's the real ₹ impact on your monthly fuel spend.
PPF at 7.1%, NSC at 7.7%: Small Savings Rates Frozen for April–June 2026 — What This Means
The government has kept PPF, NSC, Sukanya Samriddhi, and other small savings rates unchanged for the April–June 2026 quarter — the eighth consecutive quarter without a change. Here's what current rates look like, why they're frozen, and how to use them in your portfolio.
EPF Interest Rate 2025-26 Stays at 8.25%: When It Gets Credited and What It's Worth
EPFO has kept the EPF interest rate at 8.25% for FY 2025-26 for the second year running. Here's when the interest will be credited to your account, how the calculation works, and whether your EPF is actually earning what you think it is.
India's SIP Crosses ₹32,000 Crore in March 2026: What This Milestone Means for Your Investments
Indian retail investors pumped ₹32,087 crore into SIPs in March 2026 — a new record. 9.72 crore SIP accounts are now active. Here's what this wave of money means for your existing SIP and whether you should be increasing your contribution.
How to Send a WhatsApp Message Without Saving the Number (2026 Guide)
Three reliable ways to message someone on WhatsApp without adding them to your contacts — using wa.me links, QR codes, and click-to-chat buttons.
How to Compress a PDF Without Uploading It Anywhere
Most PDF compressors upload your file to a server. Here's how to reduce PDF size entirely in your browser — free, private, and with no file size limits.
Developer Tools for Beginners: 12 Browser-Based Utilities You'll Use Every Day
You don't need to install anything to use these developer tools. They run in your browser, handle the tasks you'd otherwise Google, and work on any device.
10 Browser-Based Alternatives to Cloud Tools That Don't Upload Your Data
Every tool on this list runs entirely in your browser. No uploads, no server processing, no account required. Your files and data stay on your device.
SIP vs Lump Sum Investment: Which Builds More Wealth in 2026?
SIP and lump sum both grow money — but which is right for you depends on market conditions, your cash flow, and your risk tolerance. Here's the honest breakdown.
We just shipped 17 new finance calculators — full Groww parity, all client-side
From XIRR to APY to Sukanya Samriddhi Yojana — Stax now covers every calculator on Groww's catalog, with the same math but zero server-side processing of your numbers.
Stax vs Smallpdf vs JSONLint vs TinyPNG: when does browser-only beat cloud SaaS?
Five honest comparisons between Stax tools and the popular cloud-based SaaS alternatives — where each wins, where each loses, and how to verify the privacy claims for yourself.
Cookie consent in 2026: what changed and what site owners need to do
Google Consent Mode v2, IAB TCF v2.2, and the EU's Digital Markets Act all hit production in the last 18 months. Here's what site operators actually need to ship to stay compliant — and keep AdSense revenue.
How to format JSON without uploading data anywhere — a 2026 guide
Most online JSON formatters quietly send your data to a server. Here's why that's risky for production data, and how to format JSON entirely in your browser.
Why we built Stax Tools
235+ free online tools that all run in your browser — here's why we built them and how they're different from the rest.