Playground Tools
(4)Interactive playgrounds and experiments to explore and learn — all running client-side in your browser.
Code Scratchpad VS Code-grade multi-file editor, on-device SQLite Playground Run SQL against an on-device SQLite database Online Notepad A fast notepad that autosaves to your browser Quick To-Do A quick to-do list that saves to your browser
Frequently asked questions
Are my inputs uploaded to a server?
No. Every Playground tool on PDFPowerHub runs in your browser — experimenting and learning interactively all happen on your device, so your inputs never leave it.
Do I need to install anything or create an account?
No install and no sign-up. Open the page and use any tool instantly — no limits and no watermarks.
Do these Playground tools work offline?
Yes. PDFPowerHub is a PWA, so once loaded the tools keep working with no internet connection.
Are these Playground tools free?
Yes — every tool in the Playground category is completely free, with no limits or watermarks.