Blog
By Siavash Ghanbari · Founder of Emojar
🛒Is the Bigger Pack Cheaper? A Grocery Run in Unit Prices
Coffee in grams and ounces, olive oil in liters and fl oz, paper towels by the roll. Follow one shopping trip and see which pack wins on price per unit.
Tool GuideCalculatorsShoppingMoney🗓️ISO 8601 vs RFC 2822 vs Unix Time - Date Formats Compared
Which date format should you use in an API, a log file, an email header or a spreadsheet? A side-by-side comparison with examples and parsing pitfalls.
Tool GuideDate & TimeDevelopersTime🌍ISO Country Codes Explained, From Alpha-2 to Numeric
What the two-letter, three-letter and numeric country codes in ISO 3166-1 mean, how they relate to currency codes, domains and calling codes, and where they differ.
Tool GuideReferenceGeographyStandards📆ISO Week Numbers Explained: Why Some Years Have 53 Weeks
How ISO 8601 week numbers work, why 1 January can be in week 53, how 2026 ends up with 53 weeks, and why your US calendar may show a different number.
Tool GuideDate & TimeDatesCalendars🔀JSON to XML Output Looks Wrong? 7 Common Problems, Fixed
Missing root element, arrays without a wrapper, renamed keys, values that change type on the way back. Why JSON-to-XML conversion surprises people, with fixes.
Tool GuideDeveloperJSONXML⌨️Keyboard Keys Not Working? How to Test Them and Find the Cause
A key that types nothing, two letters at once, or a game that ignores your third key? Test every key, read its code and pin down the real cause.
Tool GuideDevice TestsDevicesKeyboards🏎️km/h, mph, Knots and Mach: Which Speed Unit Is Used Where
Road signs use km/h or mph, sailors and pilots use knots, scientists use m/s. Learn where each speed unit is used and how to convert between them quickly.
Tool GuideUnitsTravelConversion📜Lorem Ipsum Myths: When Placeholder Text Helps or Hurts
Is Lorem Ipsum random gibberish? Is it safe to leave in until launch? Five common myths about placeholder text, and how to use it without regret.
Tool GuideTextDesignWeb Development🔡Lowercase Your Data to Fix Duplicate Emails and Tags
A walkthrough of cleaning a messy signup list by lowercasing it first, plus when lowercasing is safe, when it isn't, and the Caps Lock fix.
Tool GuideTextData CleaningText Case📈Margin vs Markup: How the Two Percentages Really Work
Margin and markup use the same profit but divide by different numbers. See how each is calculated, how to convert between them and how discounts eat margin.
Tool GuideCalculatorsBusinessPricing👁️Markdown Cheat Sheet: Syntax You Can Test Live
The Markdown syntax you'll actually use, from headings and links to GitHub-style tables and task lists, with the line-break gotcha that trips up everyone.
Tool GuideTextMarkdownWriting📊Mean vs Median vs Mode: Which Average Should You Use?
The mean, median and mode can tell very different stories about the same numbers. Learn when to use each, plus range and standard deviation, with examples.
Tool GuideCalculatorsMathStatistics🏷️Meta Tag and Open Graph Checklist for Every New Page
A ten-point checklist for titles, descriptions, canonical links, robots, Open Graph and X cards, with sample HTML and the mistakes that break link previews.
Tool GuideDeveloperSEOOpen Graph⬆️Migrating HTML Pages to Markdown Docs Without the Mess
Moving CMS or wiki pages into a Markdown docs site or README? What converts cleanly, what gets lost (tables, scripts, styling), and how to prep the HTML first.
Tool GuideDeveloperMarkdownHTML🔣Named, Decimal or Hex HTML Entities: Which Should You Use?
Most pages only need five characters escaped. Here's when named, decimal or hex entities are worth it, with side-by-side output for the same text.
Tool GuideDeveloperHTMLEncoding📏Navy Body Fat Method: A Tape-Measure Checklist
A 2 cm slip on the waist tape moves a Navy body fat estimate by about 1.5 points. Use this checklist to measure consistently and read the result calmly.
Tool GuideCalculatorsHealthChecklist🟥New Monitor Checklist: How to Tell Dead Pixels From Stuck Ones
Just unboxed a monitor, laptop or TV? Check it for dead and stuck pixels before the return window closes, and learn what each color actually reveals.
Tool GuideDevice TestsDevicesDisplays🌸Ovulation Myths: Day 14, Safe Days and the Fertile Window
Ovulation isn't always on day 14, and the fertile window is about six days long. Five common myths, with worked calendar examples for 21, 28 and 32-day cycles.
Tool GuideCalculatorsHealthFertility✂️PDF Cropping Myths: What a Crop Box Hides, Keeps and Changes
Cropping a PDF doesn't delete anything or shrink the file. Six common myths about PDF cropping, the crop box behind them, and how to trim margins safely.
Tool GuidePDFCropMyths🔢PDF Page Numbering Explained – Covers, Start Numbers, Totals
How to skip a cover page, continue numbering from a previous file, and avoid a wrong "of 10" total when adding page numbers to a PDF.
Tool GuidePDFPage numbersGuide