Guides worth the numbers
Deep dives on loan maths, taxes, passwords, tokens and image files — written around the free tools on this site. Nothing to install, nothing gets uploaded.
JWT tokens explained for developers
Anyone can decode a JWT — reading it proves nothing about trust. Learn the three-part structure, Base64URL quirks, registered claims and how to debug expiry timestamps correctly.
How to calculate your home loan EMI correctly
EMI looks like one number, but banks build it from a formula you can verify in two minutes. Learn the reducing-balance method, the monthly-rate trap, and why early EMIs are mostly interest.
What makes a password strong (and what doesn't)
Length beats symbol soup. See why P@ssw0rd! fails, how entropy really works, what cracking wordlists already know about substitutions, and which habits genuinely protect accounts.
GST calculation mistakes small businesses make
Adding 18% and extracting 18% give different answers — and mixing them up misquotes every price you print. The GST calculation mistakes small Indian businesses make, with worked rupee examples.
The JSON mistakes that break APIs (and how to spot them fast)
Trailing commas, smart quotes and stringified numbers cause most JSON failures. Spot the eight mistakes that break parsers fast and fix them by line number instead of by feel.
How much does a ₹5,000 monthly SIP really grow to?
A ₹5,000 monthly SIP grows to about ₹4.12 lakh in 5 years and roughly ₹25.23 lakh in 15 years at 12% — the plain-language maths behind compounding, inflation, step-up SIPs and costs.
How to compress images without visibly losing quality
Shrink photos dramatically with no visible quality loss: pick the right format, hit the quality sweet spot, resize before compressing and keep everything on your own device.
Prepay your home loan or invest the difference?
Prepaying a 9% home loan is a guaranteed, tax-free 9% return. Whether it beats investing depends on rates, taxes and temperament — a practical framework with rupee-level comparisons.
Checksums explained: verifying downloads with SHA-256
A checksum is a one-way fingerprint of your download. Learn how SHA-256 verification works, why MD5 and SHA-1 fell from grace, and how to compare hashes without uploading files.
GST-inclusive vs GST-exclusive: price without losing your margin
Promise a customer ₹999 inclusive of GST at 18%, and your net is ₹847.46 — not ₹819. Where inclusive vs exclusive pricing diverges, and the habits that stop the slow margin leak.
How to resize your photo and signature for online exam forms (UPSC, SSC, IBPS, NEET)
Exam portals reject photos over strict pixel sizes and KB ranges. Get UPSC, SSC, IBPS and NEET specs right the first time with a repeatable five-minute resizing workflow.