File Hash Checker

Compute file checksums (MD5, SHA1, SHA256, SHA512, CRC32) and verify file integrity in your browser.

  1. Home
  2. Hash & Security
  3. File Hash Checker

What is a File Hash?

A file hash (or checksum) is a fixed-length string computed from the file's contents using a cryptographic hash function. Even a small change in the file produces a completely different hash, making it useful for verifying file integrity.

Common use cases include verifying downloaded files, checking for data corruption, and ensuring files haven't been tampered with.

Hash Algorithm Guide

MD5

128-bit hash. Fast but cryptographically broken. Suitable for non-security checksums and duplicate detection.

SHA-1

160-bit hash. Considered weak against collision attacks. Still widely used for Git commits and file integrity.

SHA-256 / SHA-384 / SHA-512

Part of the SHA-2 family. SHA-256 is the current standard for file integrity verification and digital signatures. SHA-512 offers stronger security with larger output.

CRC32

32-bit checksum. Not cryptographic — designed for error detection in network/file transmission. Very fast but not collision-resistant.

Frequently Asked Questions

Is my file uploaded to a server?

No. All hash computation is performed entirely in your browser using the FileReader API and Web Crypto API. Your file never leaves your device.

Is there a file size limit?

The tool uses streaming computation (SHA via Web Crypto in chunks) to handle large files. However, browser memory may limit very large files (>2GB). Most practical files work without issues.

How do I verify a downloaded file?

Select the file, choose SHA-256 from the dropdown, paste the expected hash from the download page, and click "Compute Hashes". The tool will show a match or mismatch.

Related Hash & Security Tools

Bcrypt Generator

Generate bcrypt password hashes

Try it

MD5 Hash Generator

Generate MD5 hash from text

Try it

SHA-256 Generator

Generate SHA-256 hashes

Try it

Hash Type Identifier

Identify hash algorithm from a string

Try it

Password Strength Checker

Test password strength and entropy

Try it
Last updated: 17 Aug 2026

Related Tools

Try These Tools Too

Security Headers Checker

Try it

HMAC Generator

Try it

JWT Token Generator

Try it

Bitcoin Address Validator

Try it

RSA Key Generator

Try it

HTML Email Template Generator

Try it

Blog

Latest from Our Blog

Best Free Online Developer Tools to Use in 2026

A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.

Aug 08, 2026

How to Choose a Hash Algorithm for Data Security

A practical decision guide to choosing the right hash algorithm: MD5, SHA-1, SHA-2, SHA-3, bcrypt, argon2, PBKDF2, and SRI, with comparisons and clear recommendations.

Aug 08, 2026

CSS vs Tailwind CSS: Which One Should You Use?

A thorough, practical comparison of hand-written CSS and Tailwind CSS: learning curve, maintainability, performance, team workflows, and when each approach wins.

Aug 08, 2026

How to Optimize Core Web Vitals for Your Website

Learn practical, step-by-step techniques to improve LCP, INP, and CLS on your website. A developer-focused guide with real measurements and fixes.

Aug 08, 2026

How to Use Base64 Encoding in Real Projects

Learn practical, production-ready ways to use Base64 encoding: data URLs for images, JWT payloads, API tokens, and email attachments, with real code examples.

Aug 08, 2026

AES Encryption Explained: How It Works and Why It Matters

Learn how AES encryption works, the differences between AES-128, AES-192, and AES-256, and how to encrypt and decrypt data online.

Jun 23, 2026
View All Articles →