Utility guides

Practical guides for PDFs, images, text, code, and work tools

Short tutorials that explain when to use each tool, what to check before downloading or copying results, and how to avoid common mistakes.

Latest guides

PDF How to Merge PDF Files Online A simple guide to combining PDF files in the browser without installing a desktop PDF editor. Developer How to Format JSON for API Debugging Learn how formatted JSON helps you read API responses, config files, mock data, and logs. Image How to Compress Images Before Uploading Reduce image file size for websites, email, forms, and marketplaces while keeping the image usable. PDF PDF Split vs Extract Pages: What Is the Difference? Understand when to split every PDF page and when to extract only selected pages into a new file. Developer Best Free Browser Tools for Developers A practical set of lightweight developer utilities for formatting, encoding, timestamps, UUIDs, hashes, regex, and tokens. Text How to Check Keyword Density Without Over-Optimizing Use keyword density as a simple review signal while keeping content readable and useful. Style What to Wear to a Job Interview A practical interview outfit guide for corporate, tech, creative, service, and education roles. Style Business Casual Examples for Work Understand business casual outfits for interviews, first days, client meetings, and regular office work. Style Best Colors for a LinkedIn Profile Photo Choose outfit colors that work for LinkedIn, resume, company bio, and professional profile photos.