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Formatters Converters Decoders Blog

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Formatters
Live Markdown Previewer

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

Bulk Email Extractor Online
Remove Duplicates
IP Address Extractor from Logs

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
LLM API Payload Builder
RAG Text Chunking Simulator
Local Entity Extractor (NLP)
AI Prompt to API JSON Converter

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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