1. Home
  2. Blog

ABCTools Blog

Practical guides and in-depth articles to help you work faster and safer with files, images and everyday calculations.

How to Write Amounts in Words on Checks and Invoices

A guide to writing money amounts in words on checks, invoices and contracts — in English and Arabic — with cents and sub-units, the “only” format and worked examples.

How to Compress Images Without Losing Quality: A Practical Guide

A practical guide to shrinking images by up to 90% without visible quality loss: choosing the right format, dimensions and compression level, plus tips for website owners.

The Complete Guide to PDF Files: Merge, Split, Compress and Convert for Free

Everything you need to know about PDFs: how to merge, split, delete pages, compress and convert images to PDF — free, and without uploading your files.

How to Create Strong Passwords and Protect Your Accounts in 2026

A practical guide to creating unbreakable passwords, using a password manager and two-factor authentication, and avoiding the common mistakes that get accounts hacked.

How to Calculate Zakat: A Simple Step-by-Step Guide with Examples

A simple explanation of Zakat on wealth: when it becomes due, the gold and silver nisab, Zakat on savings, gold, shares and trade goods, with worked examples and common mistakes.

Why Do Prayer Times Differ Between Apps? Calculation Methods Explained

Why do Fajr and Isha times differ between apps? A simple explanation of prayer time calculation methods, sun angles, Umm al-Qura, the Muslim World League, and Standard vs Hanafi Asr.

BMI, Calories and Healthy Weight: A Practical Guide

How do you know if your weight is healthy? BMI and its limits, how to calculate your calorie and water needs, and a safe, realistic approach to weight loss.

10 Smart Ways to Use QR Codes in Your Small Business

How to use QR codes to boost your shop or restaurant: digital menus, guest Wi-Fi, WhatsApp orders, Google reviews and business cards — plus design and printing tips.

How to Study with Deep Focus: The Pomodoro Technique Step by Step

A practical student guide to the Pomodoro Technique: how to start, handle distractions and plan exam week, plus a suggested study schedule and evidence-based study tips.