Browser support
What is required and what happens when something is missing.
DevToolery targets current versions of Chrome, Edge, Firefox and Safari, on desktop and mobile.
Secure context required
Some tools use Web Crypto, which browsers only expose over HTTPS or on localhost. The hashing tools detect this and say so rather than failing silently.
When a feature is unavailable
- Blocked storage — preferences and favourites do not persist, and the privacy centre says so. Every tool still works.
- No IndexedDB — the workspace reports that it cannot open, and nothing else is affected.
- No Web Workers — the regex tool reports that evaluation was skipped rather than running unprotected on the main thread.
- Clipboard blocked — the copy button falls back to an older method, and reports Blocked if that also fails.
Private browsing
Tools work normally. Storage is either unavailable or cleared when the window closes, so favourites and snippets will not survive. That is the browser's behaviour, not ours.