33 free developer tools
JSON formatter, JWT decoder, Unix timestamp converter, hash and UUID generators, regex tester and 28 more — all on one page. No install, no account, and every conversion runs inside your browser, so what you paste never leaves your machine.
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.
JSON Formatter
Pretty-print JSON and get the exact line and column where it breaks.
Timestamp Converter
Turn epoch time into a readable date and back again.
Hash Generator
Compute MD5, SHA and CRC32 for text or a file, and check them against a checksum.
UUID Generator
Generate random v4 and time-sortable v7 UUIDs in bulk.
URL Encoder
Convert percent-encoding both ways and edit query parameters as a table.
Base Converter
Convert between bases 2–36 with bitwise operations and integer type checks.
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.
CSV ↔ JSON
Move spreadsheet exports and API payloads between CSV and JSON.
Lorem Ipsum
Generate filler copy for mockups in Latin or Korean.
Image Converter
Convert to PNG, JPG or WebP and resize to cut file size.
Date Calculator
Count days and business days between dates, or add periods to a date.
PDF to Image
Turn PDF pages into images without uploading the file anywhere.
Image to PDF
Merge several images into one PDF in the order you choose.
PDF to Text
Pull copyable text out of a PDF document.