Developer tools and quick references

⏰

Cron Cheat Sheet

Syntax & 27 schedules

📋

JSON Cheat Sheet

Rules & error fixes

🔑

JWT Cheat Sheet

Claims & security

⏱

Unix Time Cheat Sheet

Timestamps & date formats

🔗

URL Encoding Cheat Sheet

Percent-encoding table

🆔

UUID Cheat Sheet

Versions v1 to v8

🔐

Base64 Cheat Sheet

Alphabet & padding

🔤

HTML Entities Cheat Sheet

Named & numeric codes

🔑

Hash Cheat Sheet

MD5 vs SHA-256

📐

YAML Cheat Sheet

Syntax & gotchas

📚

All references

Printable cheat sheets

🔐

Base64

Text & files, URL-safe

🔗

URL Encoder

Encode, decode, edit queries

🔤

HTML Entities

All 2,231 named entities

🖼

Base64 Image

Data URLs, <img>, CSS

📋

JSON Formatter

Validate, fix & tree view

🔀

JSON Diff

Compare two JSON files

📐

YAML Formatter

Validate with line numbers

📄

XML Formatter

Validate, tree, XML → JSON

📊

CSV Viewer

Sort, filter, export

✍

Markdown Preview

Live preview, TOC, save .html

⏱

Epoch Converter

Timestamp ↔ date, any zone

🎨

Color Converter

HEX · RGB · HSL · contrast

🔄

YAML to JSON

Convert formats

🔄

JSON to YAML

Convert formats

🔄

CSV to JSON

Tabular → JSON

⏰

Cron Parser

Explain & build schedules

⬛

QR Code

PNG/SVG, logo, vCard

📶

Wi-Fi QR Code

Guests join by scanning

🔒

Password Gen

Passwords & passphrases

🆔

UUID Generator

v4 & v7, bulk, decode

📄

Lorem Ipsum

Text or HTML

📝

Word Counter

Words, read time, limits

Aa

Case Converter

camel · snake · kebab

🔍

Text Diff

Side by side, word-level

🔑

JWT Decoder

Decode, verify, expiry

🔒

SHA-256

MD5/SHA, files, HMAC

🛡

Bcrypt

Hash & verify, cost timing