The ToolBlur Blog
Guides, tips and tutorials to help you get more done with free online tools.
Cron Expressions Explained: Fields, Timezones and Safe Scheduling
Learn how five-field cron schedules work, why timezone and daylight-saving rules matter, and how to verify the next runs before deployment.
Read article
Markdown to HTML: A Safe Conversion and Publishing Guide
Convert Markdown accurately, understand the generated HTML, and avoid XSS and styling mistakes when publishing untrusted content.
Read article
How to Convert WebP to JPG Without Unexpected Quality Loss
Understand JPEG quality, WebP transparency, repeated compression and the checks that produce a compatible image without avoidable damage.
Read article
YAML vs JSON: How to Convert Configuration Without Breaking It
A practical guide to YAML and JSON conversion, including data types, comments, anchors, validation and production-safe review steps.
Read article
What Is BMR and How to Calculate It
Your BMR is the calories your body burns at rest. Learn how to calculate it, what affects it, and how it guides your diet.
Read article
How to Split a PDF File (Free, No Software)
Learn how to split a PDF into separate pages or a smaller range, safely and free, without uploading your file anywhere.
Read article
How to Convert PNG to JPG (and When You Should)
Learn how to convert PNG to JPG, when each format is the right choice, and how to shrink your images without losing quality.
Read article
What Is a JWT Token? Structure and How It Works
A JWT token carries login information between apps. Learn its three parts, how authentication works, and how to decode one.
Read article
What Is Base64 Encoding? A Simple Guide
Base64 encoding turns any data into safe text. Learn how it works, where it is used, and why it is not encryption.
Read article
How to Create a robots.txt File (Step by Step)
A robots.txt file tells search engines which pages to crawl. Learn the syntax, see an example, and avoid common mistakes.
Read article
How Many Words Is a 5-Minute Speech? (With a Handy Chart)
How many words is a 5-minute speech? Around 600 to 750 words. Here is how to hit the perfect length.
Read article
How Much Loan Can I Afford? A Simple Way to Find Out
Wondering how much loan you can afford? Use the 28/36 rule and a quick payment check before you borrow.
Read article
How to Calculate Compound Interest (Formula + Examples)
Learn how to calculate compound interest with the exact formula, a worked example, and the Rule of 72 shortcut.
Read article
How to Merge PDF Files for Free (No Software)
Need to combine several PDFs into one document? Do it in seconds, right in your browser, without installing anything or uploading your files.
Read article
Color Formats Explained: HEX vs RGB vs HSL
HEX, RGB and HSL all describe the same colors in different ways. Here is what each one means and when to use it in your designs.
Read article
JSON Formatting: A Beginner's Guide for Developers
JSON is the language of modern APIs. Learn what it is, why formatting matters, and how to validate and beautify it in seconds.
Read article
How to Compress Images to Speed Up Your Website
Large images are the top reason web pages load slowly. Learn how compressing them boosts speed, SEO and user experience — for free.
Read article
What Is BMI and How to Read Your Result
BMI is a quick way to check whether your weight is in a healthy range for your height. Here is what the number means — and its limits.
Read article
8 Free Online Tools Every Student Needs in 2026
From counting words in an essay to summarizing long readings, these free browser tools save students hours every week — no downloads required.
Read article
How to Create a Strong Password (and Why It Matters)
Weak passwords are the number-one cause of hacked accounts. Here is exactly what makes a password strong — and how to generate and test one for free.
Read article