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Free, fast developer tools that run entirely in your browser. No sign-up, no uploads. Your data never leaves your device.

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Data

JSON Formatter & ValidatorFormat, validate and minify JSON
Base64 Encode / DecodeUTF-8 safe, URL-safe, files to data URIs
Unix Timestamp ConverterEpoch time to date and back
UUID GeneratorUUID v4, v7, ULID and NanoID
Hash GeneratorMD5, SHA-1, SHA-256, SHA-512 and HMAC

Code

JSON to TypeScriptGenerate interfaces and types from JSON
JSON to ZodZod schemas with inferred types
JSON to JSON SchemaJSON Schema (draft 2020-12) from a sample
JSON to GoGo structs with json tags
JSON to PythonPydantic models or dataclasses
JSON to RustRust structs with serde
JSON to C#C# classes for System.Text.Json
JSON to JavaJava records with Jackson
JSON to KotlinKotlin data classes
JSON to SwiftSwift Codable structs
JSON to DartDart classes for Flutter

Text

Regex TesterLive matches, groups and replace preview
Diff CheckerCompare two texts side by side
Case ConvertercamelCase, snake_case, kebab-case and slugs

Web

Cron Expression ExplainerCron schedules in plain English
JWT DecoderInspect header, payload and expiry
URL Encode / DecodePercent-encoding and URL parser

CSS

CSS Gradient GeneratorLinear and radial gradients, visually
Color ConverterHEX, RGB, HSL and OKLCH

No tools match your search.

Free developer tools that run entirely in your browser.

Data

JSON Formatter & Validator
Base64 Encode / Decode
Unix Timestamp Converter
UUID Generator
Hash Generator

Code

JSON to TypeScript
JSON to Zod
JSON to JSON Schema
JSON to Go
JSON to Python
JSON to Rust
JSON to C#
JSON to Java
JSON to Kotlin
JSON to Swift
JSON to Dart

Text

Regex Tester
Diff Checker
Case Converter

Web

Cron Expression Explainer
JWT Decoder
URL Encode / Decode

CSS

CSS Gradient Generator
Color Converter

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