---
title: "Discussion on \"How to Verify That a File Really Stays in Your Browser\" | Hashnode"
description: "Discussion on \"How to Verify That a File Really Stays in Your Browser\". “Runs locally” is a useful privacy promise, but it should be something a user can verify—not just a line in a feature list.\nA browser-based tool can process a file on your device, send it to a server,"
url: "https://hashnode.com/posts/how-to-verify-that-a-file-really-stays-in-your-browser/6af73f438491300ccccd630a"
---

[Feed](https://hashnode.com/feed) /

Discussion

# [How to Verify That a File Really Stays in Your Browser](https://zancta-engineering.hashnode.dev/how-to-verify-that-a-file-really-stays-in-your-browser?utm_source=hashnode&utm_medium=feed)

“Runs locally” is a useful privacy promise, but it should be something a user can verify—not just a line in a feature list. A browser-based tool can process a file on your device, send it to a server,

4h ago · 3 min read · zancta-engineering.hashnode.dev  
Read the article

## Written by

[Lakhyajit Changmai](https://hashnode.com/@lakhyajit)

@lakhyajit · Guwahati, Assam, India

  
[View profile](https://hashnode.com/@lakhyajit)

Founder of ZANCTA - privacy-first PDF and image tools that run entirely in your browser. No uploads, no server-side processing.

Founder of ZANCTA (zancta.tech) - PDF and image tools that run entirely in the browser, with no uploads and no server-side processing. I write about what client-only processing actually costs: model size budgets against user patience, WebAssembly memory ceilings on input size, and why a privacy guarantee needs engineering behind it, not just a claim on a landing page. Full-stack: Next.js, TypeScript, Node.js, PostgreSQL.

## Responses

Markdown supported · ⌘↵ to post

No responses yet.