Practical guide
Base64 Encoding and Decoding: A Practical Guide
Learn what Base64 is, when to use it, and how to safely encode or decode Unicode text.
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CodeKitBox Practical Guides
Learn common online tools, data formats, and security practices with concise practical guides.
Practical guide
How to Decode and Inspect a JWT Safely
Understand JWT structure, inspect claims, and avoid confusing decoding with signature verification.
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How to Format, Validate, and Fix JSON
Learn how to beautify JSON, find common syntax errors, and prepare compact JSON for APIs.
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How to Create a QR Code That Scans Reliably
Create QR codes for URLs and text while avoiding common scanning and printing problems.
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How to Create and Manage Strong Passwords
Create unique strong passwords, understand password length, and avoid dangerous reuse.
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AI Writing Checklist: Check Word Count, Character Count, and Title Length
Use a simple checklist to review AI-generated drafts before publishing, including word count, character count, title length, and meta descriptions.
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How to Format JSON from AI Output Before Using It
AI tools often return JSON snippets. Learn how to validate, format, and clean JSON before using it in apps, prompts, automations, or configuration files.
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How to Compress Images Before Uploading to AI Tools, Forms, or Websites
Large images can fail to upload or slow down workflows. Learn how to compress and resize images before using them with AI tools, forms, websites, and email.
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Turn AI-Generated Links, Event Text, or Instructions into QR Codes
AI can draft event copy, instructions, and landing page links. Learn how to turn the final text or URL into a QR code that people can scan.
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JSON Formatter for ChatGPT Output
Clean, validate, and format JSON copied from ChatGPT before using it in prompts, APIs, automations, or configuration files.
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Decode JWT Locally Without Uploading Tokens
Inspect JWT headers, payload claims, and expiration timestamps in your browser while understanding what local decoding can and cannot prove.
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Compress an Image Under 1MB in Your Browser
Reduce photo and screenshot file sizes for forms, AI uploads, email attachments, and websites without sending the image to a server.
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JWT exp Timestamp Converter: Check Token Expiration Time
Convert JWT exp, iat, and nbf claims from Unix timestamps into readable local and UTC dates.
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JWE vs JWT: Why Some Tokens Have Five Parts
Understand the difference between JWT, JWS, and JWE, and learn why encrypted JWE compact tokens usually contain five dot-separated sections.
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Base64 Decode UTF-8 Text Without Garbled Characters
Decode Base64 values that contain Unicode, Chinese, Japanese, emoji, or API text while avoiding common character encoding problems.
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URL Encode Chinese Characters for Query Parameters
Encode Chinese, Japanese, spaces, symbols, and other non-ASCII text for safe use in URL query parameters.
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Meta Description Length Checker for SEO Snippets
Check meta description character count, rewrite long snippets, and keep page summaries clear for search results.
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Robots.txt and Sitemap Basics for New Websites
Learn what robots.txt and sitemap.xml do, where to place them, and how they help search engines discover a new website.
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How I Used Codex to Build a Small Tool Website from Idea to Launch
A practical case study about using Codex to turn a simple tool-site idea into pages, multilingual content, deployment files, SEO basics, and launch tasks.
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