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
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  1. Home
  2. Web & auth
  3. Permissions policy checker
Your files stay on your device

Permissions policy checker

Paste a Permissions-Policy header and get every directive checked for unknown features, bad allowlists, duplicates and legacy Feature-Policy syntax.

This tool is in beta

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

Report a problem

Permissions-Policy

Paste a policy to grade it.

This tool is paste-only. Browsers cannot read another site's response headers, and this page never fetches anything, so the header has to come from you: your server config, curl -sI, or a DevTools network pane. Unknown names are advisory, not proof of a mistake, because the registry cannot cover features a browser shipped after it was frozen.

Inputs

More settings▾

When this block carries the policies, the policy box above can stay empty.

The feature registry is frozen at 2026-11 and the report says so on every unknown name.

More web & auth tools

  • CSP evaluator & builder
  • HTTP header parser
  • Cookie analyzer
All web & auth tools

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