ToolJolt Blog
Clear, original guides on images, documents, finance, health, design and developer topics — each linked to the free tools that do the job.
JPG vs PNG vs WebP: Which Image Format Should You Use?
A practical guide to choosing between JPG, PNG and WebP — how each compresses, when to use it, and how to convert between them for the web.
Jun 7, 2026ImagesHow to Compress Images Without Losing Quality
Why image size matters, how lossy and lossless compression work, and a step-by-step way to shrink images to a target size while keeping them sharp.
Jun 6, 2026DocumentsHow to Convert a PDF to JPG, PNG or Text (and Shrink It)
When to turn a PDF into images vs extracting its text, how each method works, and how to compress a large PDF — all privately in your browser.
Jun 5, 2026DevelopersBase64 Encoding Explained (What, Why and When to Use It)
A plain-English guide to Base64 — what it does, why it is not encryption, where it is genuinely useful, and how to encode or decode text, files and images.
Jun 4, 2026SecurityHow to Create Strong, Secure Passwords (2026 Guide)
What actually makes a password strong, why length beats complexity, how to handle dozens of accounts, and how to generate random passwords safely.
Jun 3, 2026HealthUnderstanding BMI: How to Calculate It and What It Really Means
How Body Mass Index is calculated, what the categories mean, where BMI is useful, and its important limitations as a health measure.
Jun 2, 2026HealthHow to Calculate Your Daily Calories and Macros
Understand BMR, TDEE and macronutrients, how to set a calorie target for your goal, and how to split it into protein, carbs and fat.
Jun 1, 2026FinanceHow to Calculate Loan EMI (Formula, Examples and Tips)
Understand what an EMI is, the formula behind it, how interest and principal split over time, and how to compare loans the smart way.
May 30, 2026FinanceCompound Interest Explained (Step by Step, with Examples)
What compound interest is, how it differs from simple interest, the formula, the power of compounding frequency, and how time makes the biggest difference.
May 28, 2026MathMastering Percentages: Increase, Decrease and Percentage Change
A clear guide to percentage calculations — finding a percentage of a number, percentage change, reverse percentages, and the mistakes to avoid.
May 26, 2026MathHow to Calculate Discounts and the Final Price
Work out sale prices, stacked discounts, and whether a deal is actually good — with simple formulas and worked examples.
May 24, 2026DesignHex, RGB and HSL Color Codes Explained
What each color format means, how to read and convert them, when to use HSL for design, and how alpha/transparency fits in.
May 22, 2026MarketingWhat Is a QR Code and How Do You Create One?
How QR codes work, what they can store, tips for making codes that scan reliably, and how to generate one for free.
May 20, 2026WritingWord Count, Character Count and Reading Time Explained
Why these metrics matter for writing, SEO and social media, the character limits worth knowing, and how reading time is estimated.
May 18, 2026EverydayHow to Calculate Your Exact Age (Years, Months and Days)
The logic behind age calculation, why leap years and month lengths complicate it, and how to get an exact age between any two dates.
May 16, 2026EverydayUnit Conversion Guide: Length, Weight and Temperature
The conversion factors you actually use, the difference between metric and imperial, the temperature formulas, and how to avoid costly mistakes.
May 14, 2026MarketingUTM Parameters: The Complete Guide for Marketers
What UTM tags are, what each of the five parameters means, naming conventions that keep your analytics clean, and how to build links correctly.
May 12, 2026WritingMarkdown Cheat Sheet: Format Text the Easy Way
A quick reference to Markdown syntax — headings, emphasis, lists, links, images, code and tables — plus where it is used and how to convert it to HTML.
May 10, 2026DevelopersJSON vs YAML vs CSV: When to Use Each
A practical comparison of three everyday data formats — their strengths, weaknesses, and the right job for each, with conversion tips.
May 8, 2026DevelopersCron Expressions Explained: Scheduling Made Simple
How cron syntax works field by field, common patterns you can copy, the special characters that trip people up, and how to read any expression.
May 6, 2026DesignAspect Ratios for Images and Video (A Practical Guide)
What aspect ratio means, the common ratios for web, social and video, how to resize without distortion, and how to calculate missing dimensions.
May 4, 2026EverydayTime Zone Conversion: How to Avoid Meeting Mistakes
How time zones and UTC work, why daylight saving causes chaos, tips for scheduling across regions, and how to convert times reliably.
May 2, 2026DevelopersHow to Format and Validate JSON (and Fix Common Errors)
Why valid JSON matters, the rules the format enforces, the errors that bite developers most, and how to format and check JSON quickly.
Apr 30, 2026DesignAccessible Color Contrast: A Practical WCAG Guide
Why contrast matters for readability, what the WCAG AA and AAA thresholds are, how contrast ratio is measured, and how to fix failing colors.
Apr 28, 2026ImagesWebP and AVIF: The Next-Generation Image Formats
How WebP and AVIF compare to JPG and PNG, their compression and browser support, when to use each, and how to convert your images.
Apr 26, 2026