Developer tools that stay on your device

Format JSON, decode tokens, hash files and convert data. Paste anything below and the right tool opens.

Everything stays in your browser.

Developer tools

Free, private, and nothing you paste leaves your browser.

JSON formatter

Format, validate, tree

YAML ↔ JSON

Both directions

XML formatter

Indent, validate, minify

SQL formatter

Readable queries

HTML formatter

Beautify or minify

CSS formatter

Beautify or minify

JavaScript formatter

Beautify or minify

Markdown preview

Live preview, HTML out

Base64

Text and files

URL encode

Percent-encoding

HTML entities

Escape and unescape

JWT decoder

Header, payload, expiry

Unicode escape

\u, code points, JSON

Text to hex and binary

Hex, binary, bytes

UUID generator

v4, v7, ULID

Password generator

Strong and random

Hash generator

SHA-256, MD5, HMAC

Lorem ipsum

Placeholder text

Fake data

JSON, CSV or SQL

Timestamp converter

Epoch ↔ date

Number base converter

Binary, hex, decimal

Color converter

HEX, RGB, HSL, OKLCH

Case converter

camelCase, snake_case

CSV ↔ JSON

CSV, JSON, Excel

JSON to TypeScript

Interfaces from samples

cURL converter

fetch, axios, Python

Diff checker

Compare two texts

Regex tester

Matches, groups, replace

Line tools

Sort, dedupe, count

Slug generator

Clean URL slugs

Cron explainer

Plain English, next runs

Chmod calculator

755 ↔ rwxr-xr-x

URL parser

Parts and query

HTTP status codes

What each code means

Browse all 34 tools

Popular tasks

Ready-made settings for everyday jobs.

JSON validatorFind the error fast CSV to JSONSpreadsheets to JSON Epoch to dateRead Unix times Minify JSONSmallest valid JSON YAML to JSONConfigs to JSON JSON to YAMLReadable configs Base64 decodeBase64 back to text URL decodeReadable URLs SHA-256 hashChecksums and signatures MD5 hashLegacy checksums UUID v4Random IDs All 16 use cases

Your files never leave your device

Everything runs in your browser.

Runs on your device
Works offline
No sign-up
No watermark