Blog
By Siavash Ghanbari · Founder of Emojar
🎲7 Practical Ways to Use a Random Color Generator
From breaking a design rut to placeholder avatars and chart test data, here are seven useful jobs for random colors, plus which mode to pick for each.
Tool GuideGeneratorsColorDesign🎲7 Practical Ways to Use a Random Number Generator
Raffle winners, lottery picks, survey samples, presentation order and more. Exact settings for each, plus what makes a random draw genuinely fair.
Tool GuideGeneratorsRandomGiveaways🪙Coin Flip Myths: Streaks, Luck and the Gambler's Fallacy
After five heads, is tails due? Is 50 out of 100 the normal result? Five coin-flip myths tested with real probabilities, plus how to make a flip actually fair.
Tool GuideGeneratorsRandomProbability🎲Dice Notation Explained: 2d6, d20, 3d8+2 and 4d6kh3
What NdS±M means, how keep-highest rolls like 4d6kh3 and advantage work, and the averages and odds behind the most common tabletop dice rolls.
Tool GuideGeneratorsGamesRandom✉️Email Signature Broken in Gmail or Outlook? Common Fixes
Missing photo, lost formatting, a dead phone link or a vanished email address? Here is why email signatures break and how to fix each problem quickly.
Tool GuideGeneratorsEmailSignatures🛡️How Password Strength Checkers Estimate Crack Time
See how a strength checker turns a password into bits and crack times, why P@ssw0rd! scores as very weak, and how a breach check works without sending it.
Tool GuideGeneratorsSecurityPasswords🪪How to Choose a Good Username: A 9-Point Checklist
A practical checklist for picking a username, gamer tag or professional handle that is easy to say, safe to reuse and short enough to fit everywhere.
Tool GuideGeneratorsUsernamesPrivacy🔣How to Generate Secure Tokens, API Keys and Coupon Codes
A practical checklist for random strings - picking the right alphabet and length, avoiding confusing characters, and keeping codes unique and unguessable.
Tool GuideGeneratorsSecurityDevelopers👥How to Split a Group Into Fair Random Teams (With Captains)
A practical walkthrough for coaches, teachers and game-night hosts on splitting people into even random teams, using captains and avoiding common mix-ups.
Tool GuideGeneratorsTeamsClassroom#️⃣How to Verify a Downloaded File with a SHA-256 Checksum
A step-by-step walkthrough for checking that an installer or ISO is exactly what the publisher released, plus what a mismatch means and what it can't prove.
Tool GuideGeneratorsSecurityChecksums🧪Safe Fake Test Data: Reserved Emails, 555 Numbers and Seeds
Why good mock data uses example.com emails, 555-01xx phone numbers and documentation IPs, and how a seed gives you the exact same rows on every run.
Tool GuideGeneratorsDeveloperTesting#️⃣SHA-512 Myths: Hashing vs Encryption, Speed and Security
SHA-512 can't be decrypted, isn't a safe password store on its own and is often faster than SHA-256. Six common myths about hashing, corrected.
Tool GuideGeneratorsSecurityHashing🧾What to Include on an Invoice: A Practical Checklist
A field-by-field invoice checklist with a worked tax and discount example, plus the number-format mistakes that quietly turn a line item into zero.
Tool GuideGeneratorsBusinessInvoices▥Which Barcode Format Should You Use? Code 128, EAN-13, UPC
Code 128 for internal labels, EAN-13 or UPC-A for retail, ITF-14 for cartons. A plain-English guide to choosing a barcode type, with check digit examples.
Tool GuideGeneratorsBarcodesRetail📷Why Won't My QR Code Scan? Common Causes and Fixes
Blurry photos, low contrast, glare, a blocked camera or a code that isn't a QR code at all. How to fix a QR code that won't read, and scan it safely.
Tool GuideGeneratorsQR CodesTroubleshooting🗝️Passphrase vs Password - Which Should You Use, and When?
Random-word passphrases and random-character passwords can be equally strong. Here's how to choose between them and how many words you really need.
Tool GuideGeneratorsSecurityPasswords🎡7 Practical Ways to Use a Random Name Picker Wheel
Classroom cold-calls, giveaways, chore rotas, weighted choices and more. How to set up a spinner wheel for each, and when to remove winners between spins.
Tool GuideGeneratorsRandomClassroom🔳How to Make a Wi-Fi QR Code Guests Can Scan to Connect
Let visitors join your Wi-Fi by pointing a phone camera at a sign. How the Wi-Fi QR format works, how to print it so it scans, and what to keep in mind.
Tool GuideGeneratorsQR CodesWi-Fi🔑How Strong Is a Random Password? Entropy, Explained
Why a 16-character random password has about 104 bits of entropy, what that means in guessing time, and how a secure generator picks every character.
Tool GuideGeneratorsSecurityPasswords