Developer tools. Fast and private.
Computes MD5, SHA-1, SHA-2, SHA-3 and BLAKE for any text or file, with integrity verification.
Generates strong random passwords, with fine composition control and an entropy meter.
Analyzes your password's strength and, only on request, checks it against known leaks.
Decodes the cost parameters of a Bcrypt or Argon2 hash and explains what each one means.
Share passwords and secrets through a self-destructing link — unreadable even to the server.
Ask someone to send you a password or sensitive data — unreadable even to the server.
Ask a question and get anonymous replies from anyone — unreadable even to the server.
Decodes a JSON Web Token's header and payload, presenting every claim in readable form.
Generates and signs a JSON Web Token with the claims, algorithm and key you define.
Generates an RSA key pair (public and private) in PEM, entirely in your browser.
Generates SSH keys (Ed25519 or RSA) ready for GitHub, GitLab and authorized_keys.
Decode an X.509 certificate or CSR (PEM) and inspect subject, validity, keys and extensions.
Encrypts and decrypts text or files in your browser using a passphrase you choose.
Hide a text inside an image, invisible to the naked eye, and reveal it back.
Generates the current TOTP/HOTP code from a Base32 secret, with a live countdown to the next one.
Detects invisible text hidden in a PDF, telling legitimate OCR layers from suspicious content.
Reveals a photo's EXIF metadata: camera, GPS, capture date and the original embedded thumbnail.
Decodes a boleto's digitable line or PDF and checks its verification digits.
Checks a PDF's PAdES/ICP-Brasil signature — who signed, when, and whether the chain is trustworthy.
Proves a PDF is the original, unaltered file, with a Nexinon HMAC signature.
Decodes a Brazilian NF-e access key and checks its check digit.
Read a .pfx/.p12 certificate's data — validity, CPF/CNPJ, issuer — without leaving your browser.
Encodes and decodes Base64 in real time — accepts text and images, both directions.
Encodes and decodes text to Binary, Octal or Hexadecimal — byte by byte, in UTF-8.
Encodes and decodes values for use in URLs — query parameters and path segments.
Encodes and decodes HTML's reserved characters (& < > " ') to display text safely.
Encrypt and decrypt text with ten historical ciphers — Caesar, Vigenère and more.
Generates v4 and v7 UUIDs (RFC 9562), one at a time or in batches, ready to copy.
Generates Lorem Ipsum text in words, sentences or paragraphs, ready to copy.
Build your own schema and generate reproducible fake data as JSON, JSONL, CSV or SQL.
Generates and validates CPF/CNPJ, Brazil's tax ID documents, including the new alphanumeric CNPJ.
Fill in the details, draw the signature, and download the receipt as a PDF.
Generate course or event certificates as a PDF, with a drawn signature — solo or in batch.
Fill in grantor, grantee and powers, draw the signature and download the power of attorney as PDF.
Add the line items, set a validity period, and download the quote as a PDF.
Write what you need to declare, fill in your details, draw the signature and download it as PDF.
Generate typed QR codes for links, Wi-Fi, Pix, contacts and more — all in your browser.
Paste a code snippet and download a PNG image ready for LinkedIn, Slack or a README.
Builds commit messages that follow the Conventional Commits specification.
Pick languages, frameworks and IDEs, then generate a merged .gitignore ready to download.
Look up a domain's DNS records — A, AAAA, CNAME, MX, NS, TXT, SOA and CAA.
Look up a domain's registration data — registrar, dates, nameservers and status — via RDAP.
Inspect a domain's TLS certificate — validity, issuer, subject/SANs and protocol version.
Fetches a URL and evaluates the response's security headers — CSP, HSTS, X-Frame-Options and more.
Checks if a URL is up from our server — is it down for everyone or just you?
Paste a link and see where it leads, hop by hop — without clicking it.
Combines DNS, WHOIS, SSL, security headers and IP of a domain into one report with warnings.
Paste the JSON an API should return and get a real URL to test your frontend against.
Extracts and decodes URL parameters — paste the whole URL or just the query string.
Builds and encodes a query string from editable key/value pairs.
Look up registration, routing, cloud, reverse DNS and approximate location data for an IP.
Calculates network, mask and hosts for an IPv4/IPv6 block, plus VLSM and route aggregation.
Formats, validates and minifies JSON in real time, with clear syntax-error diagnostics.
Formats, validates and minifies XML in real time, with clear syntax-error diagnostics.
Formats and minifies SQL queries across 20 dialects, with configurable indentation and keyword case.
Converts JSON to YAML and YAML to JSON, validating both sides with line and column errors.
Converts CSV to JSON and JSON to CSV, with flexible delimiters and nested data.
Generates TypeScript interfaces, Pydantic models or Go structs from pasted JSON.
Converts JSON to XML and XML to JSON, in both directions, with error diagnostics.
Converts a curl command into ready-to-use fetch, requests, PHP or Go code.
Converts numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36.
Converts a color between HEX, RGB, HSL and HSV at once, with live preview and a screen eyedropper.
Converts a value between length, mass, temperature, volume, area, speed and digital storage.
Shrink an image file with no perceptible quality loss, entirely in your browser.
Calculates voltage, current, resistance or power from any two known quantities.
Calculates Vin, R1, R2 or Vout of a resistive divider from three known quantities.
Calculates or decodes value, tolerance and color bands of a resistor (4, 5 or 6 bands).
Look up pin functions, peripherals, and safety warnings for Arduino Uno, Nano, and ESP32.
Paint or animate a WS2812/NeoPixel LED pattern and generate ready-to-use Arduino code.
Build an Arduino/ESP32 sketch skeleton from the peripherals your project needs.
Generate an example secrets.h for Arduino/ESP32 and the .gitignore line that protects it.
Calculates the electricity cost of a device list from power, daily use and tariff.
Converts between Unix timestamps (epoch) and readable date/time, both ways, in real time.
Calculates date differences or adds/subtracts time — business days, ISO week and more.
Explains a cron expression in plain English and calculates the next run times.
Converts identifiers between camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.
Share code, logs, or configs via an expiring link, with optional encryption (server can't read it).
Detects and masks email, CPF/CNPJ, card, phone, CEP, IP and password in text, with 3 strategies.
Removes duplicate lines from a pasted list and shows how many it found.
Looks up Brazil's national holidays and optional non-working days, with legal basis and a public API.
Look up the address for a Brazilian CEP (postal code), or find CEPs for an address.
Look up the Central Bank's official PTAX rate and convert values between Real and foreign currency.
Look up a company's public data from its CNPJ: legal name, status and partners.
Explains any HTTP status code — originating RFC, common causes, and related codes.
Explains any HTTP header — category, originating specification, and related headers.
Look up a port by number or service — protocol, category, and IANA registration status.
Look up a Brazilian financial institution by COMPE code, ISPB, or name — full or popular.
Look up a MIME type by name or extension — extension, category, and IANA registration status.
Regex syntax explained symbol by symbol, with real examples and ready-to-copy patterns.