03 / interactive
Tools
Useful tools for everyday use. Everything runs in your browser — no data leaves your machine.
- Runs in your browser
- Tested
- Open source
Finance
5Net Salary Calculator 2026
Brazilian CLT net salary with INSS, income tax (new exemption up to R$ 5k), dependents, transport voucher and the full annual package.
Brazilian PJ Tax Calculator 2026
Compare MEI, Simples Nacional (Annex III with Fator R and Annex V) and Lucro Presumido and see how much you keep.
Compound Interest Calculator
Simulate monthly contributions with Brazilian regressive income tax and inflation, compared with savings and CDI — what matters is the real value, in today's money.
Vacation Planner
Find the dates that give you the most rest by bridging Brazilian holidays and weekends, following CLT rules.
Invoice Generator
Create English invoices for international clients, in USD, EUR and other currencies, and save them as PDF.
Games
1Documents & PDF
4CPF Generator & Validator
Generate valid Brazilian CPF numbers for testing (by state) and validate or format existing ones.
CNPJ Generator & Validator
Generate and validate Brazilian company IDs (CNPJ), including the new alphanumeric format (from July 2026).
PDF Studio
Merge multiple PDFs, split or reorder pages, rotate, add page numbers, stamp watermarks, edit metadata, and export pages as images.
Images to PDF
Convert photos and images (PNG, JPG, WebP, GIF, BMP, SVG) into a single PDF document with page size, orientation, and margin controls.
Development
11Table Converter
Convert tables between Excel, CSV, JSON, SQL, Markdown, HTML, YAML and 15 more formats, including code (Python, TypeScript, Go). Sort, pick columns, remove duplicates and transpose before exporting.
Text Compare (Diff)
Compare two texts side by side: different lines and characters, colour-coded changes, JSON with sorted keys and a .diff patch.
Password Generator
Strong passwords using crypto.getRandomValues, with length and character controls.
UUID Generator
UUID v4 (random) and v7 (time-ordered), plus an inspector for existing UUIDs.
Hash Generator
SHA-1, SHA-256, SHA-384 and SHA-512 of any text, computed with the Web Crypto API.
Base64 & URL Encode
Encode and decode text as Base64, Base64URL or URL (percent-encoding), with full Unicode support.
JWT Decoder
Inspect a JWT's header, payload and dates (iat, exp, nbf) without sending it to any server.
Unix Timestamp Converter
Convert timestamps (s, ms, µs, ns) to dates and dates to timestamps, in local time and UTC.
Regex Tester & Replacer
Test regular expressions in real time with match highlighting, ready-made validation patterns, named capture groups, and live replacement.
Dev Reference Explorer
Look up HTTP status codes (RFC 9110), well-known TCP/UDP ports, MIME types, and the 7-bit ASCII table (decimal, hex, binary) with instant search.
CSS Playground
Flexbox, grid and CSS features few people remember exist: container queries, :has(), popover, anchor positioning, @property and more. Move the controls or edit the CSS and see it live.
AI
1Every tool also works from the terminal
The cli.js script runs the same logic as the site with Deno, Node.js or Bun and returns JSON (the invoice returns a PDF). Parameters are the same as each tool's URL: the share link becomes the command. Each page has a “Use from the terminal” section with a ready command and the parameter list.
deno run -q "https://thecodecodex.com/cli.js?tool=net-salary&bruto=8000" curl -s https://thecodecodex.com/cli.js | node --input-type=module - cpf q=3 deno run -q "https://thecodecodex.com/cli.js" # lists tools and parameters