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Developer Tools

Every tool here is free, requires no sign-up, and runs entirely in your browser — paste tokens, secrets, and snippets without anything leaving your machine. Format JSON, test regular expressions, decode JWTs and Base64, generate UUIDs, compare text, convert timestamps, and more.

Data

JSON Formatter

Format, validate, and explore JSON with a live tree view.

SQL Formatter

Beautify SQL queries with syntax-aware indenting.

Unix Timestamp Converter

Convert between Unix timestamps, ISO 8601, UTC, and local time.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal.

Text

Regex Tester

Test regular expressions with animated match highlighting.

Markdown Editor

Write Markdown with a live split preview.

Base64 Encoder / Decoder

Instantly encode or decode Base64 strings and files.

URL Encoder / Decoder

Safely encode and decode URL components.

Text Compare / Diff Checker

Compare two blocks of text or code side-by-side with line and word diff.

Case Converter

Convert text between camelCase, snake_case, kebab-case, and more.

Web

Cron Expression Generator

Build, decode, and preview cron schedules with the next run times.

HTTP Status Codes

Searchable reference for every HTTP status code with plain-English explanations.

Security

JWT Decoder

Dissect and verify JSON Web Tokens payload-by-payload.

Password Generator

Generate strong, random passwords with tunable character classes.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly.

Generators

UUID Generator

Generate v1/v4 UUIDs in bulk, copy-ready.

Visual

CSS Gradient Generator

Design CSS gradients visually with live code output.

Color Converter

Convert between HEX, RGB, HSL, and OKLCH with a live preview.

Fun

ASCII Art Generator

Turn images and text into shareable ASCII art.

Free online developer tools

These tools are designed for learners. Each tool page includes the live utility, a beginner-friendly explanation of what the tool does, step-by-step instructions, a quick-reference cheat sheet, real examples to try, common mistakes to avoid, and an FAQ. The page itself is the lesson — you can use the tool and learn the concept behind it at the same time.

How can these tools help you learn to code?

  • They turn abstract formats into something you can see — JSON trees, regex matches, Base64 output, JWT payloads, Unix time conversions, color spaces, and more.
  • They give you safe sample inputs so you can practice without bringing your own data first, then swap in real values once the idea clicks.
  • They connect everyday utility work to programming vocabulary: payloads, claims, encodings, hashes, status codes, character classes, dialects, and time zones.

What makes Coddy tools different

  • Plain-English explanations next to every tool — not just an empty text box, but a short lesson on what each tool actually does.
  • Quick-reference cheat sheets and step-by-step instructions, so you can use the tool today and remember the concept tomorrow.
  • Everything runs locally in your browser — paste tokens, passwords, and snippets without worrying about uploads, accounts, or trackers.

Learn to code with Coddy

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