# Build a Browser-Based File Integrity Checker with JavaScript

DevFeed: [Build a Browser-Based File Integrity Checker with JavaScript](<https://devfeed.tech/articles/the-e-signature-pricing-models-that-bite-you-in-the-production-55360.md>)

Original publisher: [Read original article](<https://www.sitepoint.com/the-e-signature-pricing-models-that-bite-you-in-the-production/>)

Author: Jhon-Harry

Published: 2026-09-16T06:39:54Z

Content type: tutorial

Language: en

Sources: [SitePoint](<https://devfeed.tech/sources/sitepoint.md>)

Topics: [browser](<https://devfeed.tech/topics/browser.md>), [sha256](<https://devfeed.tech/topics/sha256.md>), [Tutorial](<https://devfeed.tech/topics/tutorial.md>), [hashing](<https://devfeed.tech/topics/hashing.md>), [Security](<https://devfeed.tech/topics/security.md>), [JavaScript](<https://devfeed.tech/topics/javascript.md>), [Web](<https://devfeed.tech/topics/web.md>), [API](<https://devfeed.tech/topics/api.md>), [Software](<https://devfeed.tech/topics/software.md>)

Tags: [agile-development](<https://devfeed.tech/tags/agile-development.md>), [api](<https://devfeed.tech/tags/api.md>), [apis](<https://devfeed.tech/tags/apis.md>), [app-development](<https://devfeed.tech/tags/app-development.md>), [browser](<https://devfeed.tech/tags/browser.md>), [file](<https://devfeed.tech/tags/file.md>), [hashing](<https://devfeed.tech/tags/hashing.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [integrity](<https://devfeed.tech/tags/integrity.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [security](<https://devfeed.tech/tags/security.md>), [sha-256](<https://devfeed.tech/tags/sha-256.md>)

## AI overview

A tutorial on building a browser-based file integrity checker with JavaScript and the Web Crypto API. It calculates a local SHA-256 hash, compares it with a trusted hash, and lets users copy the result without uploading the file.

## Source excerpt

null Continue reading The E-Signature Pricing Models That Bite You in the Production on SitePoint.