Developers

CPF Generator & Validator Generate valid CPF numbers for software testing and validate any CPF instantly. CNPJ Generator & Validator Generate valid CNPJ numbers for software testing and validate any CNPJ instantly. JSON Formatter & Validator Format, minify and validate JSON with precise error messages — right in your browser. Strong Password Generator Create strong random passwords with full control over length and characters — generated locally, never transmitted. UUID v4 Generator Generate one or many random UUID v4 identifiers with cryptographic randomness. Test Credit Card Generator Generate Luhn-valid card numbers for payment testing — clearly fictitious, never usable for real purchases. Base64 Encoder & Decoder Encode text to Base64 and decode it back — UTF-8 safe, entirely in your browser. URL Encoder & Decoder Percent-encode and decode URLs or query parameters without breaking special characters. Number Base Converter Convert numbers between binary, octal, decimal and hexadecimal — all four fields update as you type. Image to Base64 Converter Convert an image to a Base64 Data URI with ready-to-paste HTML and CSS snippets — no upload involved. Duplicate Line Remover Delete duplicate lines from any list while keeping the original order — in your browser. Invisible Character Detector Detect, reveal and remove invisible Unicode characters — zero-width spaces, NBSP, bidi marks and more. Caesar Cipher Encoder & Decoder (ROT13) Encrypt and decrypt messages with the Caesar cipher or ROT13 — right in your browser. Tabs to Spaces Converter Convert indentation between tabs and spaces with configurable width — right in your browser. Lorem Ipsum Generator Generate classic Lorem Ipsum placeholder text by words, sentences or paragraphs — in your browser. Hash Generator Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text — right in your browser. HMAC Generator Compute HMAC-SHA-256 and HMAC-SHA-512 signatures with your secret key — right in your browser. API Token Generator Generate cryptographically secure random tokens in hex, Base64URL or alphanumeric format — in your browser. JWT Decoder Decode JWT header and payload, inspect claims and expiration — without the token leaving your browser. HTML Entities Encoder & Decoder Encode special characters into HTML entities and decode them back — in your browser. XML Formatter & Validator Format, minify and validate XML with clear error messages — right in your browser. Epoch Timestamp Converter Convert Unix timestamps to human-readable dates and back — local, UTC and ISO 8601, in your browser. Markdown Table Generator Build Markdown tables visually — editable grid, per-column alignment and CSV import, in your browser. CHMOD Calculator Convert Linux file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x) in your browser. CIDR Subnet Calculator Get network, broadcast, usable host range, netmask and wildcard from any IPv4 address and CIDR prefix — in your browser. CSS Unit Converter (px ↔ em, rem, pt, %) Convert px, em, rem, pt and % with a configurable base font size — full equivalence table in your browser. PPI / DPI Calculator Find the pixel density, dot pitch and sharpness class of any screen from its resolution and diagonal — in your browser. Bitrate Calculator Convert between duration, file size and bitrate for audio and video — in your browser. Username Generator Create pronounceable, memorable usernames with an optional base word, numbers and separators. HTTP Status Codes Reference Search every standard HTTP status code — 1xx to 5xx, color-coded, with plain-English explanations. ASCII Table The complete ASCII table — decimal, hex, octal, binary and HTML entities, with click-to-copy. RG Generator & Validator Generate well-formed RG numbers with the SSP-SP algorithm and validate any RG check digit in your browser. CNH Generator & Validator Generate valid Brazilian driver's license (CNH) numbers for software testing and validate any CNH instantly. PIS/PASEP Generator & Validator Generate valid PIS, PASEP and NIT numbers for software testing and validate any of them in your browser. Voter ID Generator & Validator Generate valid Brazilian voter registration numbers by state and validate any voter ID in your browser. RENAVAM Generator & Validator Generate valid RENAVAM numbers for software testing and validate any RENAVAM in your browser. CNJ Lawsuit Number Validator Validate and decode a Brazilian unified lawsuit number — court, segment, year and origin — in your browser. IBAN Validator Validate an international bank account number, check its length by country and format it in blocks — in your browser. Robots.txt Generator Build a valid robots.txt with presets, custom rules, AI-crawler blocking and your sitemap line. XML Sitemap Generator Turn a list of URLs into a valid sitemap.xml, generated and downloaded in your browser. Data Storage Converter (GB, GiB, MB, Mbps) Convert decimal and binary storage units plus bits and bytes — and finally see why a 1 TB drive shows up as 931 GB. Paper Size Reference (A4, letter, DPI pixels) Search any paper size and get its dimensions in mm, cm and inches plus pixels at 72, 150, 300 and 600 DPI. Wi-Fi QR Code Generator Create a QR code that connects any phone to your Wi-Fi network in one scan — built in your browser. QR Code Reader Read any QR code with your camera or from an image file — decoded in your browser. Barcode Generator Create EAN-13, EAN-8, UPC, ITF-14, CODE128 and CODE39 barcodes and download the PNG — all in your browser. Markdown Preview & HTML Converter See your Markdown rendered side by side and copy the HTML — the preview runs sandboxed in your browser. YAML to JSON Converter Convert YAML to JSON and JSON to YAML, with the exact line and column of any syntax error. SQL Formatter Turn one-line, unreadable SQL into a properly indented query — 18 dialects, all in your browser. Leaked Password Checker Check whether a password appears in known data breaches — the password itself never leaves your browser. Brazilian Test Data Generator Generate fictitious people with name, CPF, e-mail, phone and address — ready to paste into a test database or a mock API. Fictitious Person Generator Generate a single fictitious person with name, CPF, RG, date of birth, phone, e-mail and address — for software testing. Fictitious Company Generator Generate a fictitious Brazilian company with trade name, CNPJ, state registration and address — for software testing. .gitignore Generator Pick your stacks and generate a .gitignore file with the right rules — Node, Python, Java, Go, React, Laravel and 15 more. Fictitious Vehicle Generator Generate a fictitious Brazilian vehicle with make, model, Mercosul plate, RENAVAM and chassis — for software testing. Passphrase Generator (Diceware) Generate a strong, memorable passphrase by combining random Portuguese words — the Diceware method with a local word list. Test Bank Account Generator Generate fictional bank accounts with valid check digits for the main Brazilian banks — for software testing only. What Is My IP See your public IP address and approximate location — city, state, country — detected from the connection, with nothing to install. My HTTP Headers See every HTTP header your browser sends with each request — user agent, accepted languages, encoding, cookies and more. DNS Lookup Look up all DNS records for a domain — A, AAAA, MX, CNAME, TXT, NS and SOA — from the server. WHOIS Lookup Query the WHOIS registration data for any domain — registrar, creation date, expiry, nameservers and contact information. SSL Certificate Checker Check the SSL/TLS certificate of any domain — issuer, validity dates, days until expiry and subject alternative names. Email MX Checker Check whether a domain can receive email by looking up its MX records — the mail servers it points to. HTTP Response Headers Fetch the HTTP response headers of any URL — status code, content type, caching, security headers and more. Online Ping Ping a host or IP address from the server — see round-trip time, packet loss and whether the host is reachable. Reverse DNS Lookup Find the hostname associated with an IP address — the reverse of a DNS lookup. Regex Tester Test regular expressions live with match highlighting, capture groups and flags — right in your browser. CSV ↔ JSON Converter Convert CSV to JSON or JSON to CSV — choose the delimiter, paste the data, and copy the result. Text Diff Compare two texts side by side and see exactly what was added, removed or changed — line by line. Cron Expression Explainer Paste a cron expression and see what it means in plain language, plus the next five scheduled runs. CSS Gradient Generator Design linear and radial CSS gradients visually, adjust colors and angle, and copy the CSS. CSS Box Shadow Generator Design box shadows visually — adjust offset, blur, spread, color and opacity, and copy the CSS. Meta Tags Generator Generate the HTML meta tags your page needs — title, description, Open Graph and Twitter Card — with a live code preview. EXIF & Metadata Remover Strip all metadata from an image — EXIF, GPS location, camera info — by re-exporting through the browser canvas. Favicon Generator Create favicons from text, emoji or an uploaded image in all standard sizes — 16×16 to 512×512. XML to JSON Converter Convert XML to JSON or JSON to XML — bidirectional, with attributes and nested elements handled correctly. My Screen Resolution See your current viewport and screen resolution — updates live as you resize the window. Password Strength Checker Type a password and see its strength — based on length, character types and entropy. YouTube Embed Code Generator Generate the HTML embed code for a YouTube video with custom width, height, autoplay and other options. State Registration Generator Generate valid IE numbers for software testing. Certificate Number Generator Generate fictitious birth/marriage/death certificate numbers for testing. License Plate Generator Generate vehicle plates in old and Mercosul formats for testing. htaccess Generator Build Apache htaccess rules for redirects, SSL and caching. Cron Expression Builder Build cron expressions visually instead of memorising the syntax. TOTP Generator Generate a TOTP secret, see the QR code, and verify tokens. JSON to TypeScript Convert a JSON sample into a TypeScript interface definition. JSON Diff Viewer Compare two JSON documents and see the differences highlighted. Base64 to Image Decoder Decode a Base64 string and display or download it as an image file.