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ZeroServer.tools

About ZeroServer.tools

Last updated: 31 July 2026

ZeroServer.tools is a collection of 988 free developer utilities — formatters, validators, converters, encoders, hash generators, calculators and text tools — that all share one unusual property: there is no server. Every tool runs as JavaScript inside your own browser tab. The name is literal.

Why build it this way

Most online developer utilities work by uploading whatever you paste to a backend, processing it there, and sending the result back. For a lot of everyday work that is genuinely risky: the JSON you want to pretty-print is a production API response, the JWT you want to decode is a live session token, the certificate you want to inspect belongs to your employer. Pasting any of that into a text box that POSTs to someone else's server is a data-handling decision, and it is usually made without thinking about it.

Removing the backend removes the decision. There is no upload step to trust, no retention policy to read, and no breach that could expose your inputs, because your inputs were never anywhere else. You can verify this claim rather than take our word for it: open your browser's DevTools, switch to the Network tab, and use any tool on this site. You will see no request carrying your data. Better still, load a tool, go offline, and watch it keep working.

How the site is built

  • Statically exported. Every page is pre-rendered HTML served from a CDN. There is no application server, no database, and no runtime API.
  • Client-side by construction. Tool logic ships as JavaScript and executes locally. Heavier capabilities (image codecs, OCR, PDF parsing) load on demand so a page you visit does not pay for a feature you did not use.
  • Offline-capable. A service worker caches the shell, so previously-visited tools keep working without a connection.
  • No account, ever.There is nothing to sign up for. Preferences (theme, pinned and recent tools) live in your browser's localStorage and are never transmitted.

Editorial standards

Each tool page is written, not generated. Alongside the utility itself you will find what the tool is for, how it works, a worked example, its limitations, and answers to the questions people actually ask about that format. Where a tool implements a published specification — RFC 9309 for robots.txt, BIP-39 for mnemonic phrases, RFC 5280 for X.509 certificates, FIPS 202 for SHA-3 — the implementation is verified against that specification's own published test vectors rather than against itself.

Corrections are welcome and acted on. If a tool gives you a wrong answer, that is a bug worth reporting, and the changelog records what has been fixed.

How the site is funded

The tools are free and there is no paid tier. Running costs are covered by a combination of advertising, occasional affiliate links, direct sponsorships, and consulting work. All of it is disclosed:

  • Advertising is labelled Advertisement and is kept out of the way of the tools themselves. In regions that require it, ads load only after you consent, and declining is a single click that costs you nothing.
  • Affiliate links are marked rel="sponsored" and never change what you pay.
  • Sponsor placements are a static image and link served from our own CDN — no cookies, no third-party scripts, no tracking.

Full detail is in the Privacy Policy. Advertising never affects which tools exist, what they output, or what the editorial content says.

Who maintains it

ZeroServer.tools is built and maintained by Meet Shah, a software engineer. It began as a personal set of utilities and grew into a public catalogue. If you need something similar built — or want a private, self-hosted version of a tool here — see Hire me.

Get in touch

Bug reports, tool requests, corrections, sponsorship and press enquiries all go to the same place: the contact page.