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HTML Formatter

Free, fast, browser-based developer tools. No signup. No data collection. Ever.

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Formatters

Offline JSON Formatter & Beautifier (No Server Logs)
JSON Diff Tool
Text Diff Checker
Live Markdown Previewer
Offline SQL Formatter (No Server Logs)
HTML Formatter

Converters

CSV to JSON Converter
YAML ↔ JSON Converter
JSON to One Line Converter

Data Tools

Extract Emails
Remove Duplicates
Extract IPs

Security

Offline JWT Decoder (No Server Logs)
Check JWT Expiration Online
Inspect JWT Header & Algorithm
JWT to JSON Converter

AI Engineering

LLM Prompt Sanitizer (PII Remover)
LLM Token Counter & Budget Estimator
JSON Schema Validator
Prompt Template Builder

Tools

Free Online URL Decoder & Encoder
Free Online Base64 Encoder & Decoder
Online Regex Tester & Debugger
Advanced UUID Generator (v4 & v7)
Cron Schedule Generator

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