Checksum Calculator

Calculate file checksums using MD5, SHA-1, SHA-256, SHA-384, and SHA-512. Verify file integrity instantly.

Uppercase hashes

Drag & drop any file here or

Choose File

Upload a file to calculate checksums

Multi-Algorithm File Hashing

Verify file integrity by calculating checksums using five different hash algorithms simultaneously. Compare against expected hashes to ensure your downloads are authentic and uncorrupted.

5 Hash Algorithms

Why Use Checksums?

Verify Downloads

Ensure downloaded files match the publisher's provided hash.

Detect Corruption

Identify corrupted files from failed transfers or storage issues.

Compare Files

Check if two files are identical without byte-by-byte comparison.

Client-Side Only

Files never leave your browser. 100% private processing.

How this Checksum Calculator works

This file integrity verification tool calculates checksums using five algorithms simultaneously: MD5, SHA-1, SHA-256, SHA-384, and SHA-512. The calculator reads uploaded files into memory, processes through each hash algorithm, and displays all results for comprehensive verification. MD5 uses SparkMD5 for fast computation while SHA variants leverage the Web Crypto API.

Drag-and-drop file upload accepts any file type—executables, archives, documents, media. Progress indicators track hashing stages for larger files. Results display each algorithm's output with bit sizes and copy buttons for individual hashes. Case toggle switches between uppercase and lowercase formats matching common checksum conventions.

The verification feature accepts pasted hashes, automatically detecting which algorithm produced a match. Green confirmation indicates file integrity while red warnings flag mismatches suggesting corruption or tampering. All processing executes locally—files never leave your browser. Applications include validating software downloads, detecting file corruption, comparing files without byte-by-byte analysis, and forensic file verification.

How to Use

Upload File

Drag & drop or select any file to calculate checksums.

View Hashes

Get MD5, SHA-1, SHA-256, SHA-384, and SHA-512 checksums instantly.

Verify

Paste an expected hash to verify your file matches.

Example Usage

Calculate multiple checksums simultaneously:

Input

Any file (image, document, executable)

Output

MD5: d41d8cd98f00b204e9800998ecf8427e

Frequently Asked Questions

What is a checksum?

A checksum is a small-sized block of data derived from a file using a hash algorithm. It's used to verify the integrity of data, ensuring the file hasn't been corrupted or tampered with.

Which algorithm should I use?

For security purposes, use SHA-256 or SHA-512. MD5 and SHA-1 are faster but considered cryptographically weak. They're still useful for quick file comparisons.

How do I verify a download?

Download the file, upload it here to get checksums, then compare with the hash provided by the website. If they match exactly, the file is intact.

Is my file uploaded anywhere?

No! All processing happens in your browser. Your files never leave your device or touch any server.

Can I hash large files?

Yes, but very large files may take longer. Progress is shown during hashing. For files over 500MB, consider using a desktop tool.

Related Tools

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for any text and optionally compare two hashes.

SHA2 Hash Generator

Generate SHA-2 family hashes (SHA-224, SHA-256, SHA-384, SHA-512) for any text input.

SHA256 Hash Generator

Generate SHA-256 cryptographic hashes for text. Used for checksums and security.

MD5 Hash Generator

Generate MD5 hash checksums for text. Common for file verification.

The Checksum Calculator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.