Learning Center
Plain-English guides behind every ManyUtils tool, what a QR code actually is, how JSON syntax works, PNG vs JPG, and more. Guides are being written and published gradually; each one links straight to the tool it's about.
What Is a QR Code? A Complete Beginner's Guide
What a QR code is, how it stores data, and how it differs from a regular barcode, explained in plain English.
6 min read QR CodesStatic vs Dynamic QR Codes: What's the Difference?
Static and dynamic QR codes look identical but behave very differently. Here's how to choose the right one.
5 min read QR CodesQR Code Best Practices: Size, Color & Placement
Practical rules for designing QR codes that scan reliably every time, contrast, sizing, error correction, and testing.
7 min read Data & File FormatsWhat Is JSON? A Practical Introduction
JSON syntax, data types, and why it became the standard format for APIs and configuration files, with real examples.
8 min read Data & File FormatsJSON Validation Guide: Common Errors & How to Fix Them
The most common JSON syntax errors, trailing commas, unquoted keys, smart quotes, and how to find and fix each one.
6 min read Data & File FormatsWhat Is Base64 Encoding? A Practical Guide
Why Base64 exists, how it turns binary data into text, and where you'll actually encounter it, from emails to data URLs.
6 min read Identifiers & SecurityUUID Explained: What It Is and When to Use One
What a UUID actually is, how v4 random generation works, and when to reach for a UUID instead of an auto-increment ID.
6 min read Identifiers & SecuritySHA-256 Explained: How Hashing Works and Why It Matters
What SHA-256 does, how it differs from encryption, and where it shows up in everyday software, from passwords to Git commits.
7 min read Identifiers & SecurityHow to Create a Strong Password (and Actually Remember It)
What makes a password hard to crack, why length beats complexity, and how a password manager changes the whole equation.
6 min read ImagesPNG vs JPG: Which Image Format Should You Use?
A practical comparison of PNG and JPG covering compression, transparency, quality loss, and which one to pick for the web.
7 min read ImagesSVG vs PNG: Choosing the Right Format for Icons & Graphics
Vector vs raster, file size, scalability, and browser support, how to decide between SVG and PNG for a given use case.
6 min read ImagesWhat Is WebP? The Modern Image Format Explained
Why Google created WebP, how it compares to PNG and JPG, and whether it's safe to use on your website today.
6 min read ImagesImage Compression Explained: Lossy vs Lossless
How image compression actually shrinks file size, the difference between lossy and lossless, and how to pick the right quality setting.
7 min read ImagesHow to Resize Images Without Losing Quality
The difference between upscaling and downscaling, why aspect ratio matters, and how to resize images for web without visible quality loss.
6 min read Design & ColorCSS Gradients Explained: Linear, Radial & Conic
How CSS gradients work under the hood, the difference between linear, radial, and conic gradients, and how to use them without hurting performance.
6 min read Design & ColorColor Theory Basics for Developers and Designers
A practical introduction to color theory, hue, saturation, complementary and analogous palettes, for people who build interfaces, not paint canvases.
7 min read Media & AudioHow to Convert Video to GIF Without Losing Quality
Why GIFs are still everywhere, how frame rate and resolution affect file size, and how to convert a video clip into a smooth, lightweight GIF.
5 min read Media & AudioAudio File Formats Explained: MP3, WAV & More
The difference between lossy and lossless audio, when to use MP3 vs WAV, and how to choose the right format for your use case.
6 min read Calculators & ConversionsUnderstanding Exchange Rates: How Currency Conversion Works
What determines an exchange rate, why the rate you see online differs from your bank's rate, and how to convert currencies accurately.
6 min read