35 free developer tools that run entirely in your browser — no signup, no uploads

New browser-based developer and document tools prioritize privacy by processing data locally via JavaScript. Hysenlabs offers a collection of 35 free developer tools, including a JSON Formatter, that require no signups or server uploads. Similarly, ToolsMonk PDF Editor allows users to edit, merge, compress, and sign PDFs directly on their devices. These utilities ensure that sensitive information, such as access tokens or private contracts, never leaves the user's machine, eliminating risks associated with server-side data storage.