All Tools ( 69 )

.gitignore Generator

Build a project-specific .gitignore in seconds — local, downloadable.

.htaccess Generator

Build Apache .htaccess rules — HTTPS, redirects, caching, more.

B2 tools

Base64 Encode / Decode

Convert text to and from Base64 — Unicode-safe, no uploads.

bcrypt Hash Generator

Generate a bcrypt-format password hash — local, no uploads.

C9 tools

CSS Minifier & Beautifier

Compress or re-indent CSS — instantly, locally.

Cron Expression Parser

Explain a 5-field cron expression and compute its next 5 runs.

CSV ↔ JSON Converter

Convert CSV to JSON and back — RFC 4180 compliant, no uploads.

Code Formatter

Beautify or minify JSON, CSS, HTML, SQL and XML in one tool.

CSP Builder

Build a Content-Security-Policy header with a clean UI.

Credit Card Validator

Luhn checksum + card type detection — 100% private.

chmod Calculator

Convert between octal (755) and symbolic (rwxr-xr-x) permissions.

curl Command Builder

Build a curl command from a friendly UI — shell-safe quoting.

Code Playground

Write, edit, and preview HTML/CSS/JS code live in your browser.

D1 tools

Dockerfile Generator

Generate multi-stage Dockerfiles for Node, Python, Go, Rust.

E3 tools

Email Validator

RFC 5322 format check — no DNS lookup, fully client-side.

Embed Tester

Test and preview embed codes before adding them to your website.

Encrypt & Decrypt Text

AES-GCM 256 encryption with a passphrase — round-trip in your browser.

F2 tools

Fake Data Generator

Generate fake JSON, CSV or SQL records for testing — 18 fields.

File Checksum

Compute SHA-1, SHA-256 and SHA-512 for any file — locally, never uploaded.

H7 tools

Hash Generator

Compute SHA-1, SHA-256 and SHA-512 hashes — locally.

HTML Entities Encode / Decode

Escape & unescape HTML entities — live, no uploads.

HMAC Generator

Compute HMAC-SHA-256/384/512 signatures — locally.

HTTP Status Codes Reference

Searchable reference of 60+ HTTP status codes — click to copy.

HTML to Markdown Converter

Convert HTML to clean Markdown via DOMParser — no regex hacks.

HTTP Headers Decoder

Parse and annotate raw HTTP headers — 60+ known headers.

HTML Heading Validator

Check h1–h6 structure for SEO — skips, multiple h1s, empty headings.

I3 tools

IP Subnet Calculator

Compute network, broadcast, mask and host range for IPv4 / IPv6.

ISBN Validator

Validate ISBN-10 and ISBN-13 checksums — mod 11 / mod 10.

IBAN Validator

Mod-97 checksum for International Bank Account Numbers.

J10 tools

JSON Formatter

Beautify, minify and validate JSON — 100% in your browser.

JWT Decoder

Inspect JWT header and payload — no signature verification.

JSON to CSV

Convert an array of JSON objects into clean CSV — locally.

JSON ↔ YAML Converter

Convert JSON to YAML and YAML back to JSON — no libraries.

JS Minifier & Beautifier

A conservative JS formatter — strip // comments, dedent, beautify.

JSON to TypeScript

Infer a TypeScript interface from any JSON sample.

JSON Schema Generator

Infer a draft-07 JSON Schema from a sample JSON object.

JSONL Formatter

Beautify, minify and convert JSON Lines — log-friendly.

JSONPath Tester

Evaluate JSONPath expressions against JSON — pure JS.

JSON-LD Builder

Build Schema.org JSON-LD snippets for rich results.

K1 tools

Keyboard Shortcut Reference

Searchable reference of 70+ shortcuts across Windows, macOS, browser, VS Code.

L1 tools

llms.txt Generator

Generate an llms.txt file to guide LLMs to your docs.

M2 tools

Markdown Preview

Write Markdown and see the rendered HTML live — side by side.

My IP Address

See your public IPv4, IPv6 and WebRTC-discovered IP.

N2 tools

Number Base Converter

Convert between binary, octal, decimal & hex — BigInt-powered.

nginx Config Generator

Generate nginx server blocks — static, SPA, proxy, PHP-FPM, HTTPS.

P3 tools

Password Generator

Strong random passwords generated locally with crypto.getRandomValues.

Passphrase Generator

Memorable multi-word passphrases — easier to type, harder to crack.

Password Strength Checker

Estimate entropy and crack time for any password — fully offline.

R4 tools

Regex Tester

Test JavaScript regex with live match highlighting & groups.

README Generator

Generate a polished README.md from a few inputs — copy or download.

Random Number Generator

Cryptographically-secure random integers — unbiased, local.

Random PIN Generator

Generate numeric PINs of any length with optional unique digits.

S6 tools

SQL Formatter

Beautify SQL with uppercase keywords & sensible line breaks.

String Escape / Unescape

Escape strings for JS, HTML, CSS, JSON, regex, URL and shell.

SSH Key Generator

Generate an RSA keypair via Web Crypto — SPKI / PKCS#8 PEM.

Script Generator

Pre-built bash, PowerShell, Python, Node and git scripts.

Secure Notes

A local-only encrypted notepad — passphrase-locked with AES-GCM 256.

SSL Certificate Decoder

Decode a PEM certificate into subject, issuer, validity and serial — locally.

T3 tools

Text ↔ Binary Converter

Convert text to binary and back — UTF-8 safe.

Truth Table Generator

Generate a truth table for any boolean expression.

TOML ↔ JSON Converter

Convert TOML to JSON and back — pure JS, no deps.

U3 tools

URL Encode / Decode

Percent-encode or decode URLs and query strings — locally.

UUID Generator

Generate cryptographically-secure UUID v4s — bulk & instant.

Username Generator

Generate memorable usernames — adjective+noun, leetspeak, full names.

V1 tools

Viewport Inspector

Live viewport size, DPR, orientation and Tailwind breakpoints.

X2 tools

XML Formatter & Minifier

Beautify or minify XML — handles attributes, CDATA, comments.

X.509 Certificate Decoder

Decode a PEM X.509 certificate — subject, issuer, validity.

Y2 tools

YAML ↔ JSON Converter

Convert YAML to JSON and back — pure JS, no dependencies.

YAML Formatter

Beautify or minify YAML — pure JS, no dependencies.