Free Tool · Runs in your browser
JSON Formatter & Validator
Paste JSON to format it with clean indentation, minify it for production, or find the exact line and column of a syntax error.
Everything runs in your browser. Your data is never sent anywhere.
Large documents are fine; everything stays in your browser.
More free tools
Free 1-Day Performance Audit
Overall score, Core Web Vitals, SSL and security checks, and the fixes to make first. One free run per day.
SSL & Security Headers Check
Confirms HTTPS, the redirect from HTTP, and the security headers that protect visitors from common attacks.
Website Speed Test
Three timed requests to measure server response time, download time and the redirect chain.
Link Preview Checker
See how a page looks when shared on WhatsApp, LinkedIn or Facebook, and which Open Graph tags are missing.
Image Compressor
Shrink JPG, PNG and WebP images for the web, right in your browser. Files never leave your device.
Colour Contrast Checker
Check text and background colours against WCAG accessibility ratios before they go into a design.