The dev toolbox
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JSON to Zod Schema Generator

Paste sample JSON and get a ready-to-use Zod schema plus its inferred TypeScript type

SemVer Calculator & Range Checker

Test versions against npm ranges like ^1.2.3 or ~2.0, compare versions, and preview version bumps

X.509 / PEM Certificate Decoder

Paste a PEM certificate or chain to see subject, issuer, expiry, SANs, key details, and fingerprints

WebSocket Tester

Connect to any ws:// or wss:// endpoint, send messages, and watch a live, timestamped log

GitHub Actions Workflow Generator

Pick a stack and triggers, get a ready-to-commit .github/workflows YAML file

★ 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

NDJSON / JSON Lines Formatter & Validator

Validate and pretty-print newline-delimited JSON, or convert to/from a regular JSON array

Markdown Preview

Write and preview Markdown in real time

SQL Formatter

Format or minify SQL across 14 dialects, including SQL Server, Oracle, and Snowflake

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

Image EXIF Viewer & Remover

See exactly what metadata is embedded in a photo — camera info, timestamp, GPS location — and strip it before sharing

GraphQL Query Formatter

Format and minify GraphQL queries, mutations, and fragments

XML Formatter

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

List Sorter & Deduplicator

Sort, dedupe, shuffle, and clean up lists of text lines

JavaScript / TypeScript Formatter & Minifier

Beautify or minify JS and TS code instantly — powered by Prettier and Terser

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 MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes and HMACs

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

Base32 Encoder / Decoder

Encode or decode RFC 4648 Base32 strings — the format behind TOTP secrets and DNSSEC

Base62 Encoder / Decoder

Encode or decode Base62 strings — the alphanumeric-only alphabet behind short URL slugs

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

ULID Generator

Generate sortable, URL-safe ULIDs in bulk — a 48-bit timestamp plus 80 bits of randomness

JSON to TypeScript

Auto-generate TypeScript interfaces from JSON objects

JSON to Zod Schema Generator

Paste sample JSON and get a ready-to-use Zod schema plus its inferred TypeScript type

QR Code Generator

Generate QR codes from any URL or text

QR Code Scanner / Decoder

Upload a QR code image and decode exactly what it contains — including 2FA otpauth:// secrets

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

Markdown Table of Contents Generator

Generate an anchor-linked table of contents from markdown headings — GitHub-style slugs

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

XML Sitemap Generator

Paste your page URLs and get a ready-to-upload sitemap.xml

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

Open Source License Generator

Pick a license, fill in your name, get a ready-to-commit LICENSE file

GitHub Actions Workflow Generator

Pick a stack and triggers, get a ready-to-commit .github/workflows YAML file

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

Dockerfile Generator

Pick a stack and get a sensible, multi-stage-aware Dockerfile — plus a matching .dockerignore

CSV ↔ JSON Converter

Convert between CSV and JSON formats instantly, in either direction

XML ↔ JSON Converter

Convert between XML 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

SVG to JSX / React Component

Paste raw SVG markup and get a ready-to-use React component

Database Connection String Parser & Builder

Parse a Postgres, MySQL, MongoDB, or Redis connection URI into its parts — or build one visually

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

WebSocket Tester

Connect to any ws:// or wss:// endpoint, send messages, and watch a live, timestamped log

SemVer Calculator & Range Checker

Test versions against npm ranges like ^1.2.3 or ~2.0, compare versions, and preview version bumps

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

CSS Selector ↔ XPath Converter

Convert between CSS selectors and XPath expressions for the common patterns both languages share

JSON Diff Checker

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

JSON Patch (RFC 6902) Generator & Applier

Diff two JSON documents into an applyable patch, or apply an existing patch to a document

IBAN Validator & Generator

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

Credit Card Test Number Generator

Generate Luhn-valid fake card numbers for testing payment forms, or validate a Luhn checksum

Unified Diff / Patch Generator

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

UUID Parser

Decode any UUID or ULID into its version, variant, and embedded timestamp

TypeScript 7 Migration Checker

Paste a tsconfig.json and see exactly which compiler options TypeScript 7 removes

Node.js Type-Stripping Checker

Scan a TypeScript file for syntax Node's built-in type stripping can't run directly

HTTP Header Inspector

Paste raw response headers and get a plain-English explanation of every one

CORS Error Debugger

Walk through exactly why a cross-origin request would be blocked — or confirm it wouldn't be

JSONPath Tester

Test JSONPath expressions against JSON with live results and the exact path to each match

User-Agent String Parser

Break a User-Agent header into browser, engine, OS, and device — with bot detection

Design

CSS Animations

Copy-paste HTML+CSS animation combos with live previews

CSS Flexbox Generator

Build flex container and item properties visually, with a live preview and copy-ready CSS

CSS Grid Generator

Build a CSS grid layout visually — columns, rows, gaps, and per-cell spans

CSS clamp() / Fluid Typography Calculator

Build a fluid font-size that scales smoothly between a min and max viewport — no media queries

CSS Unit Converter

Convert between px, rem, em, pt, and % — with a configurable base font size

Aspect Ratio Calculator

Simplify a width/height into a ratio, or solve for a missing dimension given a ratio

SVG Path Visualizer

Paste a path d attribute and see it rendered live, with its bounding box and command breakdown

CSS Custom Properties Auditor

Paste CSS and find every --token, its usage count, duplicates, and unused or undefined variables

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

CSS Specificity Calculator

Calculate and compare the specificity of CSS selectors

Placeholder Image Generator

Generate placeholder images with custom size, color, and text

CSS Scrollbar Generator

Style scrollbars with scrollbar-color/width, plus a WebKit fallback

CSS Scroll Carousel Generator

Build a zero-JavaScript carousel with dot navigation using ::scroll-marker and scroll-snap

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

HOTP Generator

Generate RFC 4226 counter-based one-time passwords — TOTP's time-independent sibling

2FA Backup Codes Generator

Generate one-time recovery codes for account 2FA setup, plus their SHA-256 hashes for server-side storage

package.json Script Inspector

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

HTTP Security Headers Checker

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

JWK ↔ PEM Converter

Convert cryptographic keys between JWK and PEM formats

Secret / API Key Scanner

Paste code or a config file and find hardcoded API keys, tokens, and credentials before they reach git

Password Strength Checker

Check how strong a password actually is — entropy, common-password matches, and predictable patterns

JWK Thumbprint Calculator

Compute an RFC 7638 thumbprint for a JSON Web Key — the canonical fingerprint used as a stable kid

Passkey / WebAuthn Playground

Create a real passkey and run an authentication ceremony entirely in your browser — no server required

Bcrypt Hash Generator & Verifier

Hash a password with bcrypt, or verify a password against an existing hash — entirely in your browser