Most "free online tool" sites upload your files to a server and cover the page in ads. Toolars runs 100 tools (PDF, JSON, image, hash, text) entirely in your browser with WebAssembly — nothing you paste or drop leaves your device. We verified it: canary-string network audits found zero outbound requests, and measured limits for every tool are published at /benchmarks. No sign-up, no ads, works offline, 13 languages, plus a Chrome extension side panel. Free forever.