Developer Tools.

30+ free online tools for encoding, formatting, generating, converting, and more. No ads, no tracking, just tools.

Encoding & Decoding

B64

Base64 Encoder/Decoder

Encode and decode Base64 strings.
JWT

JWT Decoder

Decode and inspect JSON Web Tokens.
%

URL Encoder/Decoder

Encode and decode URL components.
&

HTML Entity Encoder/Decoder

Encode and decode HTML entities.

Generators

ID

UUID Generator

Generate UUID v4, UUID v7, and ULID identifiers.
🔐

Password Generator

Generate secure, random passwords with entropy info.
#

Hash Generator

Generate MD5, SHA-256, SHA-512, and other hashes.
Aa

Lorem Ipsum Generator

Generate placeholder text for your designs.
QR

QR Code Generator

Generate QR codes from text or URLs.
F()

Fake Data Generator

Generate realistic fake data for testing.

Formatters & Validators

{ }

JSON Formatter

Pretty print, minify, and validate JSON.
.*

Regex Tester

Test regular expressions with match highlighting.
+/-

Diff Checker

Compare two texts and see the differences.
SQL

SQL Formatter

Format and beautify SQL queries.
XML

XML Formatter

Format, minify, and validate XML.
MD

Markdown Preview

Render Markdown to HTML with live preview.

Converters

🎨

Color Converter

Convert between HEX, RGB, and HSL formats.
🕐

Timestamp Converter

Convert between Unix timestamps and dates.
🕐

Cron Parser

Parse cron expressions and preview next run times.
0x

Number Base Converter

Convert numbers between bases (2–36).
KB

Byte Converter

Convert between bytes, KB, MB, GB, TB, PB.
Y/J

YAML/JSON Converter

Convert between YAML and JSON formats.
CSV

CSV/JSON Converter

Convert between CSV and JSON formats.

Text Tools

Aa

Text Case Converter

Convert text between case formats.
W#

Word Counter

Count characters, words, sentences, and more.
\n

String Escape/Unescape

Escape and unescape strings for different formats.

Security

🔒

Bcrypt & Argon2 Hash Generator

Hash and verify passwords with bcrypt or Argon2.

Reference

HTTP

HTTP Status Codes

Reference for all HTTP status codes.
IP

IP Info

Information about your current IP address.
ASC

ASCII Table

Complete ASCII character reference (0–127).
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Free Online Developer Tools

emaeglin.dev provides a comprehensive collection of free developer tools designed for everyday programming tasks. Whether you need to format JSON, encode Base64, generate UUIDs, test regular expressions, or convert between data formats, all tools are available instantly in your browser with no signup required. Every tool is fast, private, and built for developers.

Available Tool Categories

  • ✓ Encoding & Decoding — 4 tools
  • ✓ Generators — 6 tools
  • ✓ Formatters & Validators — 6 tools
  • ✓ Converters — 7 tools
  • ✓ Text Tools — 3 tools
  • ✓ Security — 1 tools
  • ✓ Reference — 3 tools