Nutter Tools
Nutter Tools

A free toolbox that runs in your browser. A tool for every job.

Your files never leave your device

Images

  • Convert images
  • Compress images
  • Resize images
  • Crop
  • Watermark

PDF & files

  • Merge PDFs
  • Split a PDF
  • Images to PDF
  • PDF to images
  • Remove photo location

Video & audio

  • Compress video
  • Convert video
  • Video to GIF
  • Convert audio
  • Trim audio

Everyday

  • QR codes
  • Passwords
  • Time zones
  • Unit converter
  • Word count
  • Webcam test

Developer

  • JSON formatter
  • Base64
  • Regex tester
  • Hashes
  • JWT decoder

Site

  • About
  • Contact
  • Settings
  • Privacy
  • Terms
  • Site map
  • llms.txt

Everyday

  • Images
  • Video
  • Audio
  • PDF & files
  • Text
  • QR codes
  • Units & math
  • Time & dates
  • Color
  • Passwords & IDs
  • Device tests
  • Sun & moon

For developers

  • JSON
  • Encoding
  • Regex & cron
  • Web & auth
  • Hashing & encryption
  • Config files
  • Network
  • Browser
  • AI
  • Fake data
© Nutter Toolsnutter.tools
  1. Home
  2. Web & auth
  3. Technology checker
Your files stay on your device

Website technology checker

Fingerprint a site's stack from pasted response headers and HTML source against a fixed signature list for CMS, frameworks, analytics, and CDN markers.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

Report a problem

Response headers

Optional, but the server, CDN, and X-Powered-By signatures only read this.

Page source

The head alone is enough for meta generator, script, and class signatures.

Paste headers, page source, or both and the scan runs as you type.

This checks a fixed signature list, not a live database: about fifty well-known markers across servers, CDNs, CMSs, commerce platforms, builders, generators, frameworks, libraries, CSS conventions, and analytics. Sites hide markers, reverse proxies strip headers, and one signature can be shared by two products, so treat every row as a strong hint rather than a verdict. Nothing is fetched and nothing is scanned beyond what you paste.

Pastes

Paste the response headers, the page source, or both. A browser cannot read a third party site's headers, so this tool never fetches: copy the headers from devtools or a curl run, and the source from view-source.

Caps: headers 65,536 characters, page source 524,288. Nothing leaves this tab.

More web & auth tools

  • HTTP header parser
  • Open graph preview
  • Certificate & CSR
All web & auth tools

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