Free Tools Blog — Guides, Tips & How-Tos

developer

How to Format and Validate JSON Online — Common Errors and Fixes

Learn how to format and validate JSON online, fix common syntax errors, and choose between beautified and minified JSON.

2026-07-04

text

Learn how Base64 encoding works, when to use it, how to decode it, and why Base64 is not encryption.

2026-07-04

developer

Learn how JWT tokens work, how to decode their header and payload, and why signature verification requires a key.

2026-07-04

developer

Learn what UUIDs are, when to use them, and how UUID v4 helps create unique identifiers for apps and databases.

2026-07-04

developer

Learn how to test regex patterns online, debug matches, understand escaping, and avoid common regular expression mistakes.

2026-07-04

developer

Learn how Unix timestamps work, how to convert epoch time to dates, and how to avoid seconds vs milliseconds and timezone mistakes.

2026-07-04

developer

Learn how hash generators work, when to use MD5, SHA-1, SHA-256 or SHA-512, and why hashing is different from encryption.

2026-07-04

pdf

Learn how to convert PDF pages into JPG images online for free, when to choose JPG or PNG, and how to keep page images clear.

2026-07-04

pdf

Learn how to convert PDF files into editable Word documents, what affects formatting accuracy, and when PDF to DOCX is the right choice.

2026-07-04

image

Learn how to crop images online, choose the right aspect ratio, remove distractions, and prepare pictures for social media or documents.

2026-07-04

image

Learn how to turn JPG, PNG and WebP images into a PDF document for sharing, printing, scans, forms and organized image collections.

2026-07-04

image

Learn how to convert images to WebP online for free, when to use WebP instead of JPG or PNG, and how to reduce image file size for faster websites.

2026-07-04