FROM CODE TO PRACTICE
Computing · Useful tools.
31 Computing tools. Compare options and choose a generator, converter or calculator for your task.
Computing
Create passwords and QR codes and prepare code for publishing. Use the minifier to reduce files and generators to support testing; review the output before integrating it into your project.
Online code minifier: JavaScript, CSS, HTML and JSON
Minify JavaScript, CSS, HTML and JSON online for free. Copy or download smaller code, processed locally in your browser with no registration.
Open toolPassword generator
Generate random passwords locally with configurable length and character groups. Exclude similar characters and copy each password without uploading data.
Open toolQR code generator
Create QR codes for text, URLs, Wi-Fi or vCard contacts. Customize colors, size and logo and download PNG or SVG, processed in your browser.
Open toolPlaceholder image generator
Create PNG images for layout tests. Set width, height, background color and text, then download a browser-generated placeholder.
Open toolColor picker
Pick a color and get its HEX, RGB and HSL values. Convert your selection for CSS, prototypes and interfaces.
Open toolMeta tag generator
Generate title, description, Open Graph and Twitter Card tags for a page. Enter the details and copy the HTML for your website.
Open toolMy browser
See information exposed by your browser: user agent, languages, cookies and connection state, with identification limitations.
Open toolMy operating system
Check the platform and user agent reported by your browser to help diagnose operating system compatibility.
Open toolMy IP address
Find the IP address seen by the server for your visit. No external lookup service is used; the result may reflect a proxy or VPN.
Open toolAPI key generator
Generate random hexadecimal or URL-safe Base64 keys with configurable length and prefix, directly in your browser.
Open toolUUID v4 generator
Generate version 4 UUID identifiers for tests, databases and applications using local cryptographic randomness.
Open toolMAC address generator
Generate MAC addresses for labs with unicast/multicast, local administration and output format controls.
Open toolIP address generator
Generate documentation IPv4 and IPv6 addresses and private IPv4 ranges for testing without checking your connection.
Open toolUTM link builder
Build campaign URLs with utm_source, utm_medium and utm_campaign while preserving other parameters and the URL fragment.
Open toolCSS gradient generator
Create linear and radial CSS gradients with two colors, angle and transition stops, ready to copy into your stylesheet.
Open toolCSS box shadow generator
Configure box-shadow offset, blur, spread, color, opacity and inset mode, producing CSS ready to copy.
Open toolColor palette generator
Create harmonious palettes from a base color using analogous, complementary, triadic and monochromatic combinations.
Open toolUnix timestamp converter
Convert Unix timestamps in seconds or milliseconds to UTC dates and convert ISO dates to timestamps locally.
Open toolURL slug generator
Turn titles and phrases into URL slugs with lowercase letters, accent removal and a configurable separator.
Open toolWhatsApp link generator
Create a wa.me link with an international phone number and a prefilled message, encoding accents and symbols correctly.
Open toolTelegram link generator
Build a t.me link from a Telegram username or generate a share link for a URL with optional text.
Open toolFictional email generator
Generate synthetic email addresses for tests using example.com or a supplied domain without creating mailboxes.
Open toolTest phone number generator
Generate Brazilian phone numbers with area code, mobile or landline options and national or international formatting for tests.
Open toolSHA and MD5 hash generator
Calculate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of UTF-8 text in your browser without uploading the content.
Open toolGitignore file generator
Build a .gitignore for Node.js, Python, Laravel or combined projects with rules for editors and operating systems.
Open toolMock JSON data generator
Generate JSON data for API mocks with user, product, order, address or custom field templates, without registration.
Open toolSQL INSERT generator
Convert an array of JSON objects into SQL INSERT statements for PostgreSQL, MySQL or SQLite with escaped names and values.
Open toolTest User Agent generator
Generate User Agent examples for desktop and mobile browsers, selecting a family and quantity for parser tests.
Open toolBarcode generator
Generate CODE128, EAN13, EAN8, UPC, ITF14, CODE39, MSI and Pharmacode barcodes with size options and SVG or PNG download.
Open toolJWT generator, decoder and signature verifier
Create, decode and verify JWT signatures with HMAC or RSA locally. Set claims, expiration, issuer and audience without uploading keys.
Open toolRegular expression builder and tester
Build regular expressions from presets or literal text and test matches, positions and groups in your browser without uploading content.
Open toolA toolbox for people who build.
Explore people and document generators, validators, text converters, calculators and development utilities. Each page explains how to use its tool and interpret the result. Generators create synthetic test data; validators check mathematical rules rather than replacing official record lookups.