Guides and How-Tos
Practical explanations written by the Toolseza team. Each guide explains the idea behind a common task, shows a worked example and links to the free tool that does the job.
PDF · 4 min read
How to Compress a PDF Without Losing Quality
Why PDFs get large, what compression really changes, and how to shrink a file for email or upload while keeping it readable.
Maths · 5 min read
How to Calculate Percentages: Formulas and Everyday Examples
A clear guide to percentages: finding a percent of a number, percentage change, reverse percentages and the mistakes people make.
Images · 4 min read
JPG vs PNG vs WebP: Which Image Format Should You Use?
A practical comparison of the three most common web image formats, with simple rules for choosing the right one.
Security · 4 min read
How to Create Strong Passwords You Can Actually Manage
What makes a password strong, why length beats complexity, and how to manage many passwords safely.
Finance · 5 min read
How Loan Interest Works: A Plain-English Guide
How monthly payments are calculated, why early payments are mostly interest, and how term and rate change the total cost.
Career · 5 min read
How to Write a CV That Gets Read
What to include, how to order it, and how to describe your experience so a recruiter understands your value in seconds.
Mathematics · 5 min read
How to Calculate Percentage Increase, Decrease & Percentage Points
Master the exact formulas for percentage changes, reverse percentages, and avoid the critical mistake of confusing percentages with percentage points.
Images · 6 min read
Choosing the Right Image Format: WebP vs JPG vs PNG for Web Performance
A deep dive into compression algorithms, alpha transparency, visual fidelity, and how image format selection directly impacts Google Core Web Vitals.
Finance · 6 min read
Understanding Loan Amortization, Interest Rates & APR
Learn how monthly payments are divided between principal and interest, why loan terms affect total borrowing costs, and how to spot hidden lending fees.
Security · 5 min read
How to Properly Redact and Password-Protect Confidential PDFs
Avoid disastrous legal leaks by understanding true digital redaction versus superficial black boxes, and learn how AES encryption secures sensitive files.
Career · 6 min read
The Complete Guide to ATS-Friendly Resume Formatting
How modern Applicant Tracking Systems parse candidate resumes, why fancy multi-column graphics fail, and how to optimize for automated job screening.
Developer · 6 min read
Data Encoding vs Encryption vs Hashing: A Developer's Practical Guide
Understand the critical differences between Base64 encoding, symmetric encryption, and one-way cryptographic hashing to prevent security vulnerabilities.
Converters · 6 min read
Metric vs Imperial: History, Exact Conversion Factors, and Precision Standards
A comprehensive guide to understanding SI metric and Imperial measurement systems, international conversion constants, and rounding rules.
Finance · 7 min read
Compound Interest vs Inflation: The Real Purchasing Power Formula
Learn how compound interest grows wealth exponentially over time, and how inflation erodes real purchasing power without disciplined financial planning.
Business · 5 min read
QR Code Design & Printing Guide: Error Correction, Contrast, and Security
Master QR code generation for marketing and product packaging. Covers Reed-Solomon error correction levels, contrast requirements, and scan testing.
Business · 6 min read
Professional Invoicing for Freelancers: Legal Requirements and Payment Terms
How to write legally compliant, professional invoices that get paid on time. Covers payment terms, VAT/tax breakdowns, and sequential numbering.
Text · 5 min read
Writing for Readability: Flesch-Kincaid, Word Counts, and Web Engagement
Learn how to measure and improve digital text readability, understand average reading speeds, and optimize article structure for higher user engagement.
Developer · 6 min read
JSON Syntax Rules, Common Parsing Errors, and REST API Best Practices
Master JavaScript Object Notation (JSON). Learn how to diagnose syntax errors, format nested structures, and safely serialize data payloads.
Business · 5 min read
How to Convert Numbers into Words for Cheques, Invoices & Legal Contracts
Learn the strict grammatical and legal rules for spelling out numbers in words. Understand UCC cheque precedence, the forty spelling rule, and hyphenation standards.
Converters · 4 min read
How to Convert Ounces to Grams: Baking Precision, Avoirdupois & Troy Weights
The exact formula to convert ounces to grams (1 oz = 28.3495 g). Master culinary kitchen measurements and understand the difference between standard and troy ounces.
Converters · 4 min read
How to Convert Grams to Ounces: Formulas, Tables & Nutrition Calculations
Convert grams (g) to ounces (oz) accurately. Practical guide for food portions, postal parcels, European recipe translation, and dietary tracking.
Data & Storage · 5 min read
How to Convert Gigabytes to Terabytes (GB to TB): Decimal vs Binary Storage
Why 1 TB is 1,000 GB in storage drives but 1,024 GiB in operating systems. Master data storage conversions and calculate real usable drive capacity.
Finance · 6 min read
How to Calculate Mortgage Payments: Formulas, Amortisation & APR Breakdown
Understand the monthly mortgage repayment formula. Learn how interest rates, loan-to-value ratios, down payments, and amortization schedules impact your total cost.
Finance · 5 min read
How Foreign Currency Exchange Works: Mid-Market Rates, Bank Spreads & Fees
Learn how international currency markets function. Understand mid-market exchange rates, how banks hide markup fees, and how to avoid costly dynamic currency conversion.