Tools
Useful tools for everyday use. Everything runs in your browser — no data leaves your machine.
Finance
9Net 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.
CLT Severance Calculator 2026
Calculate full Brazilian CLT severance for dismissal without cause, resignation, mutual agreement (Art. 484-A) or dismissal with cause: salary balance, proportional notice, 13th salary, vacation + 1/3 and FGTS fine.
13th Salary Calculator 2026
Calculate the 1st installment (advance by November), 2nd installment (with 2026 INSS and income tax by December) and total net 13th salary.
Vacation Planner
Find the dates that give you the most rest by bridging Brazilian holidays and weekends, following CLT rules.
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.
Fixed Income Comparator: CDB vs LCI/LCA vs Treasury
Compare net returns across CDB, tax-exempt LCI/LCA, Tesouro Selic, Tesouro IPCA+ and Savings, and find the tax-equivalent rate for any holding period.
Price vs SAC Loan Simulator
Compare monthly payments, total interest and balance evolution between Price (fixed payment) and SAC (constant amortization), including extra monthly principal payments.
Invoice Generator
Create English invoices for international clients, in USD, EUR and other currencies, and save them as PDF.
PDF & Files
6PDF 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.
PDF to Image
Convert PDF pages into high-resolution PNG, JPEG, or WebP images (1× to 3× DPI) directly in your browser.
Image Studio
Convert between WebP, JPEG, and PNG, compress, resize proportionally, and strip EXIF metadata locally.
QR Code & PIX Generator
Generate crisp SVG/PNG QR Codes for Brazilian PIX Copy-and-Paste (BRCode EMVCo with CRC16), URLs, and Wi-Fi networks.
Table 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.
Brazil Documents
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).
NF-e Key & Boleto Inspector
Inspect, validate, and generate 44-digit Brazilian NF-e/CT-e access keys and decode 47-digit FEBRABAN bank slip lines.
PIS, CNH, Voter ID & RENAVAM
Generate and validate Brazilian PIS/PASEP, Driver License (CNH), Voter ID (by state), and vehicle RENAVAM numbers for QA testing.
Games
3Sim Racing FOV Calculator
Find the correct field of view (FOV) for your rig — monitor, distance and screens — and the exact value for each racing game.
Sim Racing Fuel & Strategy
Calculate minimum, recommended, and safe fuel loads, max stint laps, and pit stops for iRacing, ACC, Le Mans Ultimate, and AMS2.
Mouse Sensitivity & eDPI Converter
Convert your mouse sensitivity across CS2, Valorant, Overwatch 2, Rainbow Six, Fortnite, and Battlefield while keeping the exact same cm/360°.
Development
10Text 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
2AI Skills
A catalog of skills in the Agent Skills format for Claude Code, Codex, Cursor and other agents: read them, download the .md files or install them from the command line.
LLM Token & API Cost Calculator
Estimate prompt BPE tokens, context window usage, and per-request / monthly API cost (USD & BRL) across Gemini, Claude, OpenAI, and DeepSeek.
Every 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://tools.thecodecodex.com/cli.js?tool=net-salary&bruto=8000" curl -s https://tools.thecodecodex.com/cli.js | node --input-type=module - cpf q=3 deno run -q "https://tools.thecodecodex.com/cli.js" # lists tools and parameters