Free QA & Testing Tools Online
Validate API specs, inspect HAR captures and SOAP messages, test selectors, tidy Gherkin features, generate stable E2E locators and design compact pairwise test suites. Everything runs in your browser.
OpenAPI Validator & Viewer – Swagger Spec Checker
Validate OpenAPI 3.x and Swagger 2.0 specs in YAML or JSON, find broken $refs and missing fields, and browse endpoints, parameters and schemas.
QA & Testing ToolsHAR File Viewer & Analyzer
Open HAR files from browser DevTools to inspect every request, response, header and timing, find slow or failed calls and export them as cURL.
QA & Testing ToolsSOAP Message Viewer & Request Builder
Format and inspect SOAP 1.1 and 1.2 envelopes, read headers, body and faults, and build SOAP requests with the matching cURL command.
QA & Testing ToolsXPath & CSS Selector Tester
Test XPath expressions and CSS selectors against your HTML or XML and see every matching element highlighted, for scraping and test automation.
QA & Testing ToolsGherkin Formatter & Validator
Format and validate Gherkin feature files for Cucumber, SpecFlow and Behave. Align tables, fix indentation and catch syntax errors in scenarios.
QA & Testing ToolsE2E Locator Generator – Playwright, Cypress & Selenium
Paste an HTML snippet and get robust locators for Playwright, Cypress and Selenium, ranked by resilience: role, label, test id, text and CSS.
QA & Testing ToolsPairwise Test Case Generator – All-Pairs Testing
Generate a minimal set of test cases that covers every pair of parameter values. Cut combinatorial test suites down while keeping coverage.
QA & Testing Tools