10 free tools · 100% in-browser

Developer Tools

A growing collection of fast, practical, privacy-friendly utilities for developers. Everything runs locally in your browser — your data is never sent to a server.

100% in-browser

Every tool runs locally. Your data never leaves your device or touches a server.

Free, no sign-up

No accounts, no limits, no ads in the way of the tool. Just open and use.

Fast & keyboard-friendly

Instant results, copy/download, drag & drop, and handy keyboard shortcuts.

All tools

10 available

JSON

JSON Formatter & Validator

Format, beautify, validate, and minify JSON online. Runs entirely in your browser.

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C# / .NET

JSON to C# Converter

Convert JSON into C# classes, records, and models with namespaces and serialization attributes.

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Security / API

JWT Decoder & Inspector

Decode JWT headers and payloads, inspect claims, and check expiration — entirely in your browser.

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SQL / Database

SQL Formatter & Beautifier

Format and beautify SQL queries with customizable indentation, keyword casing, and dialect support.

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Encoding

Base64 Encoder & Decoder

Encode text and files to Base64 or decode Base64 back — with UTF-8, URL-safe Base64, and Data URIs. Runs entirely in your browser.

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Identifiers

UUID Generator & Validator

Generate random UUID v4 and time-ordered v7 identifiers, generate in bulk, validate UUIDs, and inspect versions — all in your browser.

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Scheduling / DevOps

Cron Expression Generator & Helper

Build, validate, and explain Linux/Unix cron expressions visually, and preview upcoming run times — all in your browser.

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DevOps / Web Server

Nginx Config Generator

Generate Nginx configs for reverse proxies, Next.js, ASP.NET Core, Node.js, Docker, WebSockets, SSL, and static sites — all in your browser.

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Database / Connectivity

Connection String Builder

Build, validate, and explain connection strings for SQL Server, PostgreSQL, MySQL, SQLite, Oracle, MongoDB, Redis, RabbitMQ, and Azure — all in your browser.

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C# / .NET

C# appsettings.json Generator

Visually build ASP.NET Core appsettings.json and generate environment variables, Docker, Kubernetes, and C# options classes — all in your browser.

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