Every dev tool you need,
in one fast place.
No signup, no uploads, no waiting. All 20 tools run entirely inside your browser, so whatever you paste never leaves your machine.
- Free tools
- 20
- Data uploaded
- None
- Price
- $0
Developer tools
Engineering utilities for code, APIs and data formats
SQL to TypeScript
Paste a CREATE TABLE statement and get interfaces, JSON Schema, Pydantic or Zod.
Cron Generator
Build cron expressions and see the plain-English meaning plus next run times.
JWT Decoder
Decode header and payload, check expiry and verify HS256 signatures locally.
Regex Tester
See matches, capture groups and replacements update as you type.
cURL Converter
Turn any cURL command into fetch, Axios, Python requests or Go.
Base64 & URL Encoder
Encode text, files and images to Base64 — plus URL encoding in one place.
YAML · JSON · TOML
Switch config formats freely and catch syntax errors as you type.
Flexbox & Grid Generator
Tweak properties visually, then copy CSS, HTML or Tailwind classes.
Color & Contrast
Convert HEX, RGB, HSL and OKLCH and check accessibility contrast.
Markdown Previewer
Render markdown as you type and export to HTML or PDF.
Text & document tools
Office utilities to finish writing, data and image chores fast
Invoice Generator
Enter line items and download a clean, professional invoice PDF.
Case Converter
One input, twelve naming conventions rendered side by side.
Text Diff Checker
Highlight what was added and removed between two texts.
Mock Data & Anonymizer
Create realistic fake datasets or strip personal data out of a real CSV.
Password Generator
Cryptographically random passwords with instant strength analysis.
Timezone Converter
Convert one moment into local time across as many cities as you need.
Word Counter
Live counts for characters, words, paragraphs and reading time.
QR Code Generator
Create URL, Wi-Fi and contact QR codes with your own colors and size.
Open Graph Previewer
See how your link will look on X, Facebook, LinkedIn, Slack and Google.
Dedupe & Sort
Strip duplicates from a list and reorder it however you need.
Why DevTools Hub
Your data never leaves the tab
Every conversion runs in client-side JavaScript. Paste internal SQL schemas, production JWTs or customer CSVs — no network request is made with your input.
No install, no account
No CLI, no extension, no signup. Open the link and it works, and most tools keep working after you go offline.
Output built for real work
Copy, download and reset controls on every tool, with results formatted so you can paste them straight into your codebase or documents.