Developer

Validate any CPF number instantly. Verify if a Brazilian individual taxpayer ID is real — instant verification, works on any device.

Generate valid CPF numbers for testing and development. Supports batch generation with formatted or raw output. Built for developers and QA teams.

Validate any CNPJ number online in seconds. Check if a Brazilian company registration is valid — instant results, works on mobile and desktop.

Generate valid CNPJ numbers for testing and development. Bulk generation, formatted or digits-only output. Built for developers and QA engineers.

Generate valid alphanumeric CNPJs in the new RFB format (IN 2.119/2022). The first free tool for the 2026 Brazilian company ID format — ready for your test suite.

Validate CNPJs in the new alphanumeric format (IN RFB 2.119/2022, effective Jul 2026). First free online validator for the new Brazilian company ID format.

Look up any Brazilian CEP (zip code) and get the full address instantly. Street, neighborhood, city and state. Free tool with ViaCEP integration.

Generate Lorem Ipsum text for design and development. Paragraphs, sentences, words or lists. Customizable from 1 to 100 units. Copy with one click.

Convert numbers between binary, octal, decimal and hexadecimal instantly. Supports large integers (BigInt). Simultaneous output in all 4 bases.

Generate barcodes in EAN-13, EAN-8, Code128, UPC-A, ITF-14 and more formats. Download as PNG or SVG. Free for commercial use and testing.

Validate the 44-digit access key of Brazilian NFe/NFCe with Modulo 11 check digit. Decodes state, date, CNPJ, model and series. Instant result.

Generate valid NFe access keys (44 digits) for software testing and fiscal integration. Correct Modulo 11 check digit. Free tool for developers.

Look up Brazilian company data by CNPJ: business name, CNAE, address, registration status and partners. Official Federal Revenue open data. Free lookup.

Validate multiple CPFs at once: paste a list and see which are valid or invalid. 100% free.

Validate multiple CNPJs (numeric and alphanumeric) at once. 100% free and browser-based.

Generate multiple valid CPFs at once for testing. Export as text, CSV or JSON. 100% free.

Generate multiple valid CNPJs (numeric and alphanumeric) for testing. 100% free.

Generate UUIDs/GUIDs v1, v4 and v7 online. Copy or batch export. 100% free and browser-based.

Format, minify and validate JSON online with syntax highlight. Detects errors. 100% free.

Encode and decode Base64 online. Supports UTF-8 text and files. 100% free and browser-based.

Convert JSON to CSV and CSV to JSON online. Table preview. Free download.

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text or file online. Compare hashes. 100% free.

Encode and decode URLs online. Supports encodeURI and encodeURIComponent. 100% free.

Convert Unix timestamp to human date and vice-versa. Supports seconds and milliseconds. 100% free.

Generate valid credit card numbers for testing (Visa, Mastercard, Amex). Luhn algorithm. 100% free.

Generate fictional bank account data for testing: branch, account, bank. Real Brazilian banks. 100% free.

Generate valid random Brazilian zip codes (CEP) by state or range. Perfect for populating test databases and QA environments.

Generate fictitious company data: CNPJ, State Registration, company name, full address. Ideal for testing.

Generate valid Brazilian RG (identity card) numbers by state. Ideal for system testing. 100% free.

Generate valid Brazilian driver license (CNH) numbers for system testing. Official algorithm. 100% free.

Search, copy and download free Lucide icons as SVG or PNG. Choose size, color and stroke. 1,500+ MIT icons.

Generate fictitious Brazilian certificate registration numbers per CNJ Provision 73/2018.

Pick any color and instantly convert between HEX, RGB and HSL formats. Visual color wheel, manual input, copy code with one click. Free for designers & developers.

Generate a professional typographic scale from a base size and ratio. Preview all heading levels and export as CSS variables.

Generate SEO-optimized HTML meta tags: title, description, Open Graph, Twitter Card. Copy code. Free.

Browse the full ASCII table with all 128 characters, decimal, hexadecimal and binary codes. Free.

Organize, validate and analyze .env files: sort alphabetically, group by prefix, detect duplicates and flag sensitive keys.

Generate Apache .htaccess rules visually: HTTPS redirect, www, cache control, CORS, IP blocking, directory protection and more.

Calculate CRC32 hash of text or files. Result in hexadecimal and decimal. 100% free.

Create .ico favicons from text, emoji or image upload. Generate multiple sizes (16, 32, 48px) with real browser tab preview.

Validate any IBAN (International Bank Account Number) instantly. Supports 77 countries. ISO 13616, MOD-97 algorithm. Free.

Calculate and maintain image aspect ratios. Resize images without distortion or find the simplified ratio of any dimensions. Free.

Test and debug regular expressions in real time. See matches highlighted, capture groups extracted, and flags applied. Supports JavaScript regex syntax. Free.

Build cron expressions visually with next run preview. Supports minute, hour, day-of-month, month, and day-of-week. Free.

Calculate Unix/Linux file permissions with visual checkboxes. Convert between numeric and symbolic modes. Free.

Create CSS gradients (linear, radial, conic) with real-time preview and copy-ready code. Free.

Edit Markdown with a full toolbar and real-time side-by-side preview. GFM support (tables, checklists). Free.

Format and beautify SQL queries with automatic indentation and syntax highlighting. Multi-dialect support. Free.

Create CSS box-shadow effects visually. Multiple layers, color picker, blur and spread controls, ready-made presets. Copy the code with one click.

Validate, format, and convert YAML to JSON with error detection and statistics. 100% free.

Convert pixels to REM and back with a reference table and Tailwind CSS support. Custom base font size. Free.