Air-Gapped Utility.
Zero Data Retention.
Execute cryptographic operations, generate secure credentials, and format data locally. Your browser is the execution environment. Nothing is transmitted. Nothing is stored.
Audit any website in seconds.
75+ checks across SEO, speed, Core Web Vitals, AI search visibility and security, graded A–F with a prioritised fix list and a PDF report. The depth of paid audit tools — free, with no sign-up.
- On-Page SEO
- Technical SEO
- Core Web Vitals
- Mobile & Accessibility
- AI Search (GEO)
- Links
- Social Previews
- Security
Core Utilities
Local Execution ActiveJSON Formatter
Format, validate, minify, and beautify JSON instantly. Client-side processing for maximum privacy.
HEIC Converter
Convert iPhone photos to PNG/JPG.
Image Compressor
Reduce file size without quality loss.
Why Use UtilLab?
Most online tools upload your files to remote servers, risking privacy and slowing down your workflow. UtilLab processes everything locally in your browser using modern Web APIs and WebAssembly. Your files never leave your device.
Zero Uploads
Your files and text are processed in your browser. They never leave your machine.
Instant Results
No queue, no waiting, no server limits.
Free Forever
Basic tools are 100% free, supported by minimal ads.
Developer Friendly
Clean APIs, open formats, no watermarks.