File Hash Checker

About File Hash Checker

This tool calculates cryptographic hash values (checksums) for files. Upload any file and get MD5, SHA-1, SHA-256, and SHA-512 hashes instantly. Use these hashes to verify file integrity and authenticity. All processing happens in your browser for complete privacy.

What is a file hash?

A file hash (or checksum) is a unique fingerprint of a file. It's a fixed-length string generated from the file's contents using a cryptographic algorithm. Even a tiny change to the file will result in a completely different hash.

What hash algorithms are supported?

This tool calculates MD5, SHA-1, SHA-256, and SHA-512 hashes. SHA-256 and SHA-512 are more secure and recommended for modern use. MD5 and SHA-1 are still useful for non-security purposes like file verification.

Why would I need to calculate a file hash?

File hashes are used to verify file integrity and authenticity. Common uses include: verifying downloads haven't been corrupted, checking if two files are identical, detecting file tampering, and confirming software authenticity against official checksums.

Which hash algorithm should I use?

For security-critical applications, use SHA-256 or SHA-512. For simple file verification and comparison, MD5 or SHA-1 are sufficient. Many software providers publish SHA-256 checksums for download verification.

How long does hash calculation take?

Hash calculation speed depends on file size and your device's performance. Small files (under 10MB) calculate almost instantly. Larger files may take a few seconds. The tool processes files in chunks to remain responsive.

Is there a file size limit?

There's no strict file size limit, but very large files (over 1GB) may be slow to process depending on your device. The tool works entirely in your browser, so performance depends on available memory and processing power.

Is my file safe?

Absolutely! All hash calculation happens directly in your browser using JavaScript. Your file is never uploaded to any server. The file stays completely private on your device.

Can I verify a hash against a known value?

Currently, this tool only calculates hashes. To verify, simply compare the calculated hash with your known value - they should match exactly. Future versions may include automatic verification.