ToolAlto Guides

Helpful Guides for Everyday Online Tasks

Practical, beginner-friendly guides that explain common tasks and point you to the right free ToolAlto utility.

How to Compress Images Without Losing Quality

Learn practical ways to reduce image file size while keeping photos and graphics looking sharp, plus a free online compressor.

Understand the difference between JPG and PNG and learn which format is better for photos, screenshots, logos, transparency, and web images.

A simple guide to combining multiple PDF files into one document, with practical tips for ordering pages and checking the final file.

Learn when to count words, characters, and characters including spaces, with examples for essays, social posts, forms, and other text.

Learn how to turn compact or messy JSON into readable, indented JSON and how to spot common formatting problems.

Learn the most common JSON syntax errors and a quick workflow for checking whether JSON is valid before using it in an application.

Learn the basic percentage formulas for finding a percentage of a number, percentage change, discounts, and more.

Learn how age is calculated from a birth date, why the exact date matters, and how to calculate age quickly online.

Learn what QR codes are, how they work, and how to create a QR code for a website link, contact page, menu, or other destination.

Learn what UUIDs are, why developers use them as identifiers, and when generating a UUID can be useful.