Guides
Toolbantu Articles
Straightforward guides for getting the most out of Toolbantu's free online tools — creating QR codes, compressing and resizing images, merging and splitting PDFs, formatting JSON, counting words, and more. No fluff, just what you need to get the job done.
Developer guides
Data formats, encodings and identifiers explained with practical examples.
Developer
What Is JSON?
What is JSON? A simple explanation of JSON's structure, why developers use it, and how to format or validate it online for free.
Developer
How to Format JSON Online
Learn how to format JSON online for free — pretty-print, minify, and validate JSON instantly in your browser, with no signup required.
Developer
What Is Base64 Encoding and How Does It Work?
Base64 turns any data into plain text characters. Learn how the encoding works, why it makes data about 33% bigger, and where you will run into it.
Developer
What Is URL Encoding (Percent-Encoding)?
URL encoding replaces unsafe characters in links with % codes. Learn what gets encoded, how spaces work, and encodeURI vs encodeURIComponent.
Developer
What Is a UUID and When Should You Use One?
A UUID is a 128-bit identifier that is unique without a central authority. Learn the format, how v4 and v7 differ, and when a UUID is the right choice.
Developer
How to Validate JSON and Fix Common Errors
Paste your JSON, find the exact line that breaks it, and fix it. The ten most common JSON errors with before-and-after examples.
Developer
JSON vs XML: What's the Difference?
JSON and XML both store structured data as text. Compare syntax, data types, readability and use cases, with the same data shown in both formats.
Developer
Base64 vs Encryption: Why Base64 Is Not Secure
Base64 is an encoding, not encryption. Anyone can decode it without a key. See the difference with examples, including Basic auth headers and JWTs.
Developer
URL Structure Explained: The Parts of a Web Address
Break a URL into its parts: scheme, host, port, path, query string and fragment. Learn what each does, with one annotated example.
Image guides
Formats, compression and resizing: what actually changes in your files.
Image
How to Compress an Image to 20KB, 50KB, 100KB or 200KB
Compress an image to a target size such as 20KB, 50KB, 100KB, 200KB or 2MB, and learn what decides file size.
Image
How to Compress an Image Without Losing Quality
Learn how to compress an image without losing quality, using smart compression settings instead of guesswork. Free, browser-based, no uploads.
Image
JPG vs PNG: Which Image Format Should You Use?
JPG vs PNG explained simply: how each format compresses images, when to use one over the other, and how to compress either without losing quality.
Image
How to Resize an Image Online
Learn how to resize an image online to exact dimensions without stretching or distortion, using a free browser-based tool with no signup required.
Image
WebP vs JPG: Which Format Should You Use?
WebP usually gives smaller files than JPG at similar quality and supports transparency. See when each format is the better choice and where WebP can fall short.
Image
How Image Compression Works (Lossy vs Lossless)
Why JPG files shrink so much and PNG files do not. A plain-English look at lossy and lossless compression, the quality slider and why repeated saving hurts.
PDF guides
Merging, splitting, compressing and converting PDFs, and how to do it without uploading your files.
How to Merge PDF Files Online (Free, No Upload)
Learn how to merge PDF files into one document in your browser: add the files, set the order, merge and check the result. No signup and no uploads.
How to Split a PDF or Extract Pages (Free)
Split a PDF into separate files or extract just the pages you need. Learn page-range syntax like 1-3, 5, 8-10 and how to remove a page. No upload.
How to Compress a PDF and Reduce Its File Size
Why PDFs get big, what actually shrinks them, and the trade-offs of compressing a PDF online. Includes when compression will make a file larger.
How to Convert JPG to PDF (One Image or Many)
Turn one photo or a whole set of images into a single PDF. Covers page size, orientation, margins, quality and how to keep the file small. No upload.
How to Convert PDF to JPG: Pages to Images
Convert PDF pages to JPG images. Learn which DPI to choose (72, 150 or 300), how to pick pages, and what the converter can and cannot do. No upload.
Are Online PDF Tools Safe? Uploading vs Browser-Based
How online PDF tools handle your files, the difference between server upload and in-browser processing, and how to check what a tool does with your PDF.
Password and security guides
How passwords are generated and what makes them hold up.
Security
How to Create a Strong Password
Learn what makes a password strong: length, randomness and uniqueness. Includes a quick way to generate one and simple habits that protect your accounts.
Security
How Password Generators Work (and Why Randomness Matters)
What a password generator actually does: secure randomness, character sets, and entropy. Includes the math for how many bits a password really has.
QR code and link guides
Making codes and links that work reliably in the real world.
Utility
How to Add a QR Code to Word or Excel
Convert text to a QR code image and insert it into Word or Excel, and keep it scannable.
Utility
How to Create a QR Code Online
Learn how to create a QR code online in under a minute, no signup or app required. Turn any link or text into a scannable, downloadable QR code.
Utility
What Is a QR Code and How Does It Work?
A plain-English explanation of what a QR code is, how it stores information, and how phone cameras read it — plus how to create your own.
Utility
YouTube Thumbnail Sizes and Dimensions Explained
The recommended YouTube thumbnail size is 1280x720 pixels. See every resolution YouTube generates for a video and how to download the one you need.
Writing and typing guides
Counting, measuring and improving your text.
Writing
How to Count Words and Characters Online
Count words and characters online instantly with a free, live word counter. See sentences and paragraphs too, with no signup or word limit.
Writing
How to Type Faster: Practical Tips and What Counts as a Good WPM
Improve your typing speed with touch typing, accuracy-first practice and short daily sessions. Includes how WPM is calculated and what a good score looks like.
Colour and design guides
Colour formats and how they map to design work.