The dev toolbox
you've been looking for.

Base58 Encoder / Decoder

Encode or decode Base58 strings — the Bitcoin-style alphabet that skips ambiguous characters

Unified Diff / Patch Generator

Generate a real, downloadable .patch file from two texts — usable with git apply or patch

HTTP Security Headers Checker

Paste raw response headers and check them against HSTS, CSP, X-Frame-Options, and more

JSON to Markdown Table

Convert a JSON array of objects into a ready-to-paste Markdown table

CSS Box Shadow Generator

Build single or multi-layer CSS box shadows visually, with live preview

★ Featured

JSON Formatter

Format, validate and minify JSON instantly

JWT Generator

Create and sign JWTs with custom claims in-browser

Regex Tester

Test and debug regular expressions with live highlighting

Diff Checker

Compare two texts and highlight differences

Color Palette Generator

Generate harmonious color palettes from any base color

AES / RSA Encryption

Encrypt and decrypt text using AES-GCM and RSA-OAEP

Format

JSON Formatter

Format, validate and minify JSON instantly

Markdown Preview

Write and preview Markdown in real time

SQL Formatter

Format and beautify SQL queries with dialect support

HTML Formatter

Prettify and minify HTML markup instantly

Word Counter

Count words, characters, sentences, and estimate reading time

SVG Optimizer

Strip editor cruft and shrink SVG file size — entirely in your browser

Image Compressor

Compress and resize JPEG, PNG, and WebP images entirely in your browser

GraphQL Query Formatter

Format and minify GraphQL queries, mutations, and fragments

XML Formatter

Prettify, minify, and validate XML with CDATA-safe formatting

Encode

Base64 Encoder/Decoder

Encode or decode Base64 strings instantly

URL Encoder/Decoder

Encode and decode URLs and query parameters

JWT Decoder

Decode and inspect JWT tokens instantly

Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes

HTML Entity Encoder

Encode and decode HTML entities and special characters

Image to Base64

Convert images to Base64 data URIs for embedding

Base58 Encoder / Decoder

Encode or decode Base58 strings — the Bitcoin-style alphabet that skips ambiguous characters

Generate

Lorem Ipsum Generator

Generate placeholder text for your designs

Password Generator

Generate strong, random passwords with custom rules

UUID Generator

Generate RFC 4122 v4 UUIDs in bulk

JSON to TypeScript

Auto-generate TypeScript interfaces from JSON objects

QR Code Generator

Generate QR codes from any URL or text

JWT Generator

Create and sign JWTs with custom claims in-browser

Git Command Generator

Find and copy git commands fast — search, filter by category, with warnings

Markdown Table Generator

Build Markdown tables visually — edit cells, align columns, export as HTML

Meta Tags Generator

Generate Open Graph, Twitter Card, and SEO meta tags with live previews

Favicon Generator

Upload one image and get every favicon size your site needs

Fake Data Generator

Define a schema and generate realistic mock JSON or CSV data

.gitignore Generator

Pick your stack and get a ready-to-use .gitignore instantly

JSON Schema Generator

Infer a JSON Schema (draft-07) from a sample JSON object

Slug Generator

Turn titles into clean, URL-safe slugs — batch supported

robots.txt Generator

Build a robots.txt with per-bot rules, AI crawler blocking, and sitemap links

Barcode Generator

Generate Code 128, EAN-13, and UPC-A barcodes — download as PNG

README Badge Generator

Build shields.io badges for your README — custom text badges or live repo stats

Convert

Color Converter

Convert between HEX, RGB, and HSL color formats

Timestamp Converter

Convert Unix timestamps to human-readable dates

Number Base Converter

Convert numbers between binary, octal, decimal, and hex

String Case Converter

Convert text between camelCase, snake_case, kebab-case and more

JSON ↔ YAML Converter

Convert between JSON and YAML formats instantly

IP / CIDR Calculator

Calculate subnet masks, IP ranges, and host counts from CIDR notation

Docker Run to Compose

Convert docker run commands to docker-compose.yml and back

CSV ↔ JSON Converter

Convert between CSV and JSON formats instantly, in either direction

Env File Tool

Parse, convert, and generate .env.example files from your .env

cURL to Code

Paste a curl command, get working code in JavaScript, Python, PHP, or Go

URL Parser & Query String Builder

Break down a URL into its parts and build query strings visually

.htaccess to Nginx Converter

Convert Apache .htaccess rules to nginx server block syntax

Meeting Planner

Compare working hours across time zones and find a meeting time that works for everyone

JSON to Markdown Table

Convert a JSON array of objects into a ready-to-paste Markdown table

Test

Regex Tester

Test and debug regular expressions with live highlighting

Diff Checker

Compare two texts and highlight differences

CRON Expression Tester

Parse cron expressions and preview upcoming run times

HTTP Request Builder

Build and send HTTP requests like a lightweight Postman

YAML / TOML / JSON Validator

Validate and convert between YAML, TOML, and JSON formats

Text Diff

Inline character-level diff between two short texts

XPath Tester

Test XPath expressions against XML and HTML with live results

JSON Diff Checker

Compare two JSON objects and see exactly what changed, path by path

IBAN Validator & Generator

Validate an IBAN's MOD-97 checksum, or generate a test IBAN for any supported country

Unified Diff / Patch Generator

Generate a real, downloadable .patch file from two texts — usable with git apply or patch

Design

CSS Animations

Copy-paste HTML+CSS animation combos with live previews

CSS Gradient Generator

Build linear, radial, and conic CSS gradients visually

Color Palette Generator

Generate harmonious color palettes from any base color

Mermaid Diagram Editor

Write flowcharts, sequence diagrams, and more as text — rendered live

Image Color Palette Extractor

Upload an image and extract its dominant colors as a usable palette

CSS Box Shadow Generator

Build single or multi-layer CSS box shadows visually, with live preview

Security

AES / RSA Encryption

Encrypt and decrypt text using AES-GCM and RSA-OAEP

CSP Header Builder & Analyzer

Build a Content-Security-Policy header visually, or paste one to check for unsafe directives

JWT Key Pair Generator

Generate RSA and ECDSA key pairs for signing JWTs — PEM and JWK formats

SSH Key Generator

Generate Ed25519 and RSA SSH key pairs in OpenSSH format, entirely in your browser

TOTP / 2FA Code Generator

Generate live TOTP authentication codes from a secret key — test 2FA integrations in your browser

package.json Script Inspector

See exactly which scripts run automatically on install, and which dependencies aren't pinned