--- title: Free Online Tools description: Free Online Tools, such as HTML escaper, JSON prettifier and more. source_url: html: https://testingbot.com/free-online-tools md: https://testingbot.com/free-online-tools.md --- 100% Free Tools # Developer Tools Made Simple A curated collection of free online tools for developers, testers and designers. Format code, generate test data and convert between formats, all from within your browser. 30+ Free Tools Instant Results Private No Data Stored ## Code Formatter - ### [JSON Prettifier](https://testingbot.com/free-online-tools/json-prettify) Prettify JSON code online with this free tool. Try it free - ### [HTML Escaper](https://testingbot.com/free-online-tools/html-escape) Escape HTML code online with this free tool. Try it free - ### [XML Prettifier](https://testingbot.com/free-online-tools/xml-prettify) Prettify your XML code online with this free tool. Try it free - ### [Remove Whitespace](https://testingbot.com/free-online-tools/remove-all-whitespace) Remove whitespace (tabs, spaces and newlines) from any text. Try it free - ### [Text to One Line](https://testingbot.com/free-online-tools/text-to-one-line) Convert multi-line text or code into a single line without any breaks. Try it free - ### [CSS Prettifier](https://testingbot.com/free-online-tools/css-prettify) Prettify, format and beautify CSS code or minify it to reduce file size. Try it free ## Page Speed - ### [Critical CSS Generator](https://testingbot.com/free-online-tools/critical-css-generator) Speed up your website by preloading the critical CSS on your pages. Try it free ## Accessibility - ### [Color Contrast Checker](https://testingbot.com/free-online-tools/color-contrast-checker) Check WCAG color contrast compliance for text and backgrounds. Try it free ## Network Tools - ### [What's My IP Address](https://testingbot.com/free-online-tools/whats-my-ip-address) Find out your public IP address, location, ISP, and other network information instantly. Try it free - ### [My GPS Location](https://testingbot.com/free-online-tools/my-gps-location) Get your current GPS coordinates from your browser with address lookup and map view. Try it free - ### [CORS Tester](https://testingbot.com/free-online-tools/cors-tester) Test Cross-Origin Resource Sharing (CORS) configuration of any endpoint. Try it free - ### [IP Subnet Calculator](https://testingbot.com/free-online-tools/ip-subnet-calculator) Calculate network address, broadcast, host range, wildcard mask and CIDR notation. Try it free ## Time & Date Tools - ### [Unix Timestamp Converter](https://testingbot.com/free-online-tools/unix-timestamp-converter) Convert Unix timestamps to human-readable dates and get the current Unix timestamp. Try it free - ### [Cron Expression Generator](https://testingbot.com/free-online-tools/cron-expression-generator) Generate and test cron expressions with human-readable descriptions and next run times. Try it free ## Converters - ### [Puppeteer to Playwright](https://testingbot.com/free-online-tools/puppeteer-to-playwright-converter) Convert Puppeteer code into Playwright code. Try it free - ### [PX to REM Converter](https://testingbot.com/free-online-tools/px-to-rem-converter) Convert pixel values to REM units for responsive designs. Try it free ## Data Generators - ### [Avatar Generator](https://testingbot.com/free-online-tools/free-avatar-generator) Generate random avatars for your projects and prototypes. Try it free - ### [Placeholder Image Generator](https://testingbot.com/free-online-tools/placeholder-image-generator) Generate placeholder images with custom dimensions for your designs. Try it free - ### [Credit Card Generator](https://testingbot.com/free-online-tools/credit-card-number-generator) Generate fake credit card numbers online for testing. Try it free - ### [Random Number Generator](https://testingbot.com/free-online-tools/random-number-generator) Generate a random number between any two numbers. Try it free - ### [JWT Parser](https://testingbot.com/free-online-tools/jwt-parser) Decode and parse JWT tokens to inspect their contents. Try it free - ### [Address Generator](https://testingbot.com/free-online-tools/random-address-generator) Generate a random postal address for testing. Try it free - ### [Fake Person Generator](https://testingbot.com/free-online-tools/fake-person-generator) Generate details for a fake person for testing purposes. Try it free - ### [Hash Text](https://testingbot.com/free-online-tools/hash-text) Hash text using MD5, SHA1, SHA256, SHA512, and more. Try it free - ### [Lorem Ipsum Generator](https://testingbot.com/free-online-tools/lorem-ipsum-generator) Generate random placeholder text for your designs. Try it free - ### [Random IP Generator](https://testingbot.com/free-online-tools/random-ip-generator) Generate a random IPv4 address for testing. Try it free - ### [GUID Generator](https://testingbot.com/free-online-tools/random-guid-generator) Generate random and unique GUIDs. Try it free - ### [Character Count](https://testingbot.com/free-online-tools/character-count) Count the number of characters in any piece of text. Try it free - ### [ASCII to Binary](https://testingbot.com/free-online-tools/ascii-to-binary) Convert ASCII text to its binary notation. Try it free - ### [Random Color Generator](https://testingbot.com/free-online-tools/random-color-generator) Generate random colors in HEX notation. Try it free - ### [Open Graph Meta Generator](https://testingbot.com/free-online-tools/og-meta-generator) Generate OG and social media meta tags for your website. Try it free - ### [QR Code Generator](https://testingbot.com/free-online-tools/qr-code-generator) Generate and download QR codes with customizable options. Try it free - ### [Device Information](https://testingbot.com/free-online-tools/device-information) Get detailed info about your device, browser, and screen. Try it free - ### [User Agent Parser](https://testingbot.com/free-online-tools/user-agent-parser) Parse user agent strings to detect browser, OS, and device. Try it free - ### [Image Extractor](https://testingbot.com/free-online-tools/image-extractor) Extract all images from any public website. Try it free - ### [Test Plan Generator](https://testingbot.com/free-online-tools/test-plan-generator) Generate comprehensive test plans with scope, schedule and risks. Try it free ## Calculators - ### [Test Effort Estimator](https://testingbot.com/free-online-tools/test-effort-estimator) Estimate total testing hours based on project parameters, complexity, and automation coverage. Try it free - ### [Test Coverage Calculator](https://testingbot.com/free-online-tools/test-coverage-calculator) Calculate quality score, requirements coverage, pass rate and defect density. Try it free ## Testing - ### [XPath & CSS Selector Tester](https://testingbot.com/free-online-tools/xpath-css-selector-tester) Test selectors against HTML with snippets for Selenium, Cypress and Playwright. Try it free