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Privacy

4 ZeroUtil articles cover privacy, published between March 2026 and April 2026. Each one is written to explain the mechanism rather than list steps, and links to the free browser tools that do the job.

These articles sit alongside the security & privacy , pdf tools and image tools toolsets.

Article title card. A shield with its right half filled in amber, with the line: what leaves the machine, and when
Security & Privacy Guide

The Online Privacy Guide: Practical Threat Models for Browser-Based Work in 2026

Threat models worth naming, the thirty-second check that beats any privacy policy, and an honest list of which of our own tools upload your file.

Article title card. A clipboard holding three lines of text with an amber exclamation mark on its corner, with the line: paste is a transfer, not a view
Security & Privacy

Never Paste This Into a Random Online Tool

A working threat model for web tools at work: where a paste actually lands, which data is fine, and the thirty-second check that beats reading a privacy policy.

Article title card. A browser window holding an amber document with a padlock on it, with the line: the file never leaves the tab
PDF Tools

Why Your PDF Tool Should Run in the Browser, Not the Cloud

What an upload actually exposes, which PDF operations a browser can genuinely perform, and which ones cannot run locally at all. Including ours.

Article title card. A large grey square, an arrow, and a much smaller amber square, with the line: same picture, fewer bytes
Image Tools

Client-Side Image Compression: What's Actually Happening in the Browser

The real pipeline behind Canvas, OffscreenCanvas and WebCodecs, which formats a browser will and will not encode, and when you still need a server.

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