Guides
Walkthroughs for the file problems that actually come up — getting a photograph under a 50KB exam-portal limit, shrinking a scanned PDF for an upload cap, or converting a document without wrecking its layout. Each guide explains why the constraint exists and the order of operations that solves it, then points you at the tool.
How to compress an image to 50KB
Get any photo under 50KB for exam and government form uploads, without the image becoming unreadable. Free, runs in your browser.
How to compress an image to 100KB
Reduce any photo to under 100KB for KYC, bank, and visa uploads while keeping it clearly legible. Free and fully private.
How to compress an image or signature to 20KB
Get a scanned signature or small photo under 20KB for form uploads without it becoming illegible. Free browser tool, no signup.
How to compress a PDF to 100KB
Reduce a PDF under 100KB for portal uploads while keeping it readable. Runs in your browser, so documents are never uploaded.
How to reduce image size without losing quality
The order of operations that shrinks a photo dramatically while keeping it sharp: crop, resize, then compress. Free and private.
How to convert a PDF to Word for free
Turn a PDF into an editable Word document in your browser. Learn what converts cleanly, what does not, and why scans need OCR.
How to do voice typing in Hindi (and other Indian languages)
Type Hindi, Tamil, Bengali and more by speaking, straight in your browser. No keyboard layout, no app install, no signup.
How to convert WebP to JPG (and when not to)
Turn WebP images into JPG or PNG so older software and upload forms accept them. Free, instant, and nothing is uploaded.
How to calculate percentage increase and decrease
Learn how to calculate percentage increase and decrease with the exact mathematical formula, step-by-step examples, and common pitfalls.
How loan EMI is calculated: formula and interest impact
Understand the mathematical formula behind loan EMI calculation, how interest amortization works over time, and how prepayments save money.
SIP vs lump sum investment: returns and compounding
Compare Systematic Investment Plans (SIP) with lump sum investments. Understand rupee-cost averaging, compounding formulas, and market volatility.
How to calculate GST: inclusive vs exclusive formulas
The formulas to add or remove GST from an invoice price at the 5%, 18% and 40% slabs (and older 12% and 28% invoices), with worked examples.
PNG vs SVG vs WebP: which image format to choose
Compare PNG, SVG, and WebP image formats for web performance, file size, scalability, and transparency. Choose the best format for every graphic.
How to convert PDF to Word without losing formatting
Step-by-step guide to converting PDF documents to editable Microsoft Word (.docx) files while preserving paragraphs, headings, and layouts.
Complete guide to JSON formatting and validation
Master JSON syntax rules, fix common errors like trailing commas and single quotes, and format nested API payloads cleanly in your browser.
Understanding aspect ratios: 16:9, 4:3, 9:16 explained
A complete guide to display and video aspect ratios: formulas for calculating dimensions, resizing for social media, and preventing letterboxing.
How to view and remove photo EXIF metadata for privacy
Discover what hidden EXIF metadata lives inside your photos, including GPS coordinates, camera serials, and timestamps, and how to safely strip it.
How to calculate compound interest with practical examples
Learn the compound interest formula A = P(1 + r/n)^(nt), see worked financial examples with annual and monthly compounding, and compare with simple interest.
Regular expressions for beginners: a practical guide
Learn regex from scratch with practical character classes, quantifiers, lookaheads, and common validation patterns for emails, URLs, and phones.
Metric to imperial unit conversion formulas and reference
A comprehensive reference guide for converting length, mass, volume, and temperature between metric and imperial systems with exact mathematical ratios.
HTTP status codes explained: what 200, 301, 404 and 500 mean
Understand HTTP status codes in minutes: the five classes, the codes you meet most, what causes each error and how to fix 4xx and 5xx responses.
How to convert a curl command to JavaScript fetch
Turn a curl command into working fetch code: copy it from DevTools, convert headers, JSON bodies and auth, and avoid the CORS and cookie traps.
How to convert a curl command to Python requests
Translate a curl command to Python: headers, JSON and form bodies, file uploads, auth, timeouts and redirects, with requests, httpx or urllib.
CORS errors explained, and how to fix them
Why browsers block cross-origin requests, how preflights work, and the exact headers that fix 'No Access-Control-Allow-Origin' errors, step by step.
What internet speed do you need? Mbps explained
How many Mbps you need for streaming, video calls, gaming and a busy household, what ping and jitter mean, and how to test your speed properly.
Dice probability: the odds for 2d6, 3d6 and d20 rolls
Exact odds for rolling two or three dice, advantage and disadvantage on a d20, and why 7 is the most common roll. With tables you can trust.