Guides
These guides explain the decisions behind everyday file tasks, such as which image format fits a job, how to shrink a photo without ruining it, and what settings actually matter. Each one is written in plain language, gives a direct answer first, and links to the free tools on this site that let you try the advice straight away. Everything runs in your browser, so your files stay on your device while you follow along.
Images
- YouTube Thumbnail Size Guide: Best Dimensions & Aspect Ratio Learn the best YouTube thumbnail size, dimensions, and aspect ratio. Discover image formats, file size limits, resizing tips, and design best practices.
- Compress Images Without Losing Quality Shrink image files for email, uploads and websites while keeping them sharp. Learn what makes files large and the settings and order of steps that help.
- JPG vs PNG vs WebP: Which Format to Use JPG, PNG and WebP compress images differently. Learn how each one works, where each fits best, and how to convert between them in your browser.
Developer
- How to Format and Validate JSON Online Learn to format, minify and validate JSON, fix common syntax errors, and convert it to CSV, YAML or XML using browser-based developer tools.
- Markdown Syntax Guide for Beginners Learn Markdown syntax with clear examples of headings, lists, links, code blocks and tables. Use the cheat sheet and preview your writing in a browser.
- JSON vs XML vs YAML: Differences and When to Use Each Compare JSON, XML and YAML with the same data in all three formats, a comparison table, common pitfalls and tips for converting between them.
- What Is Base64 Encoding? How It Works and When to Use It Base64 turns binary data into plain text so it can travel through text-only systems. See how it works step by step, its limits and common mistakes.