Online tools for developers, network, JSON, text and more.

IPv4, CIDR, VLSM and network division.

See your public IP, browser, headers and timezone.

Geolocation for IPv4 and IPv6 addresses.

Curated TCP/UDP port catalog by service, range, security and RFC.

Vendor identification from MAC address (OUI).

Worked time, lunch breaks and overtime balance.

Build and explain cron expressions.

Find paths inside JSON structures.

Preview and export Markdown.

Build, test and explain regular expressions.

Filler text for mockups.

Convert JSON to TOON to save tokens.

Case, spacing and accent transforms.

Characters, words, paragraphs and reading time.

Compare two blocks of text.

Customizable, exportable QR Codes.

Nicknames with Unicode, symbols and categories.

Length, weight, temperature, data and more.

Compound interest with contributions and chart.

Generate mathematically valid CPF numbers for tests without querying or creating real registrations.

Generate check-digit-valid CNPJ numbers for testing and staging environments.

Validate Brazilian CPF and CNPJ check digits with local formatting.

Look up Brazilian postal code address, city, state and approximate geolocation via BrasilAPI.

Look up public CNPJ registry data through BrasilAPI/Minha Receita.

Find the state and cities served by a Brazilian DDD area code.

List Brazilian national holidays by year, including movable holidays.

Look up Brazilian banks by code or list institutions with ISPB.

Look up official Brazilian rates and indexes available through BrasilAPI.

Look up selected currency exchange rates against BRL by date.

Search Mercosur NCM product codes by code or description.

Look up book metadata by ISBN through BrasilAPI-supported providers.

Check status, hosts and suggestions for .br domains.

Look up FIPE price, reference tables, brands and vehicle models via BrasilAPI.

Look up Brazilian states, estimated population and municipalities by UF.

List PIX participants from Central Bank data exposed by BrasilAPI.

Look up CVM-registered brokers as a list or by CNPJ.

Look up CVM investment funds by page or CNPJ.

Look up CPTEC capitals, cities, airports, weather forecast and wave data.

List B3 stock and fund tickers available through BrasilAPI.

Search Brazilian supplementary health TUSS terms and codes.

Color palettes and harmonies with 8 algorithms.

HEX, RGB, HSL, HSV, CMYK, LAB and XYZ.

Linear, radial and conic gradients.

Pick colors and extract from images.

Generate strong, secure passwords using the browser crypto API.

MD5, SHA-1, SHA-256 and more for text and files.

Caesar, Vigenère, Atbash and other classical ciphers.

Decode JWTs and verify HMAC locally without sending tokens or secrets.

Calculate adult BMI with classification and explicit limitations.

Estimate basal metabolic rate using the Mifflin-St Jeor equation.

Estimate daily energy expenditure from BMR and activity.

Calculate BMI-for-age percentile using CDC references for people ages 2–19.

Split calories into protein, carbohydrates and fat using AMDR ranges.

Estimate total daily water intake by age, sex, pregnancy, lactation and context.

Compare historical adult reference-weight formulas.

Calculate moderate and vigorous training zones by age, with Karvonen option.

Estimate body fat percentage from circumferences with explicit limitations.