Hash Generator

The Hash Generator computes MD5, SHA-1, SHA-256, SHA-384, and SHA-512 digests of any text or file, entirely in your browser. The SHA family is calculated with the browser's native Web Crypto API and MD5 with a small embedded implementation — your data is never uploaded anywhere, which makes this tool safe even for private documents.

What is a hash and why is it useful?

A cryptographic hash is a fixed-length "fingerprint" of data: the same input always produces the same hash, while even a one-byte change produces a completely different one. Developers use hashes to verify file downloads, deduplicate content, generate cache keys, sign API requests, and compare files without reading them byte by byte. Checking that a downloaded file's SHA-256 matches the value published by its author is the standard way to confirm the file wasn't corrupted or tampered with.

Key Features

• Five Algorithms at Once: MD5, SHA-1, SHA-256, SHA-384, and SHA-512 are computed in parallel for every input.
• Text and File Modes: Hash typed text (UTF-8) or any local file via drag & drop.
• Native Speed: SHA digests use the browser's hardware-accelerated Web Crypto API, so even large files hash quickly.
• Uppercase Toggle: Switch between lowercase and uppercase hex output to match whatever format you're comparing against.
• One-Click Copy: Copy a single hash or all five (labeled) with one button.
• 100% Client-Side Privacy: Files are read locally with the File API; no network requests are made.

How to Use the Hash Generator

1. Choose Text or File mode.
2. Type/paste your text, or drag & drop a file (any type, any size your device's memory allows).
3. All five hashes appear automatically.
4. Click Copy next to the hash you need, or Copy All for a labeled list.

Why Choose This Tool?

Uploading a confidential file to a website just to get its checksum defeats the purpose of verifying integrity. This tool reads files locally, computes digests with the same primitives your operating system uses, and works offline after the page loads. No limits, no queues, no data collection.

Frequently Asked Questions (FAQ)

Is my file uploaded to a server?

No. The file is read directly in your browser with the File API and hashed in memory. You can verify this by loading the page and then disconnecting from the internet — hashing still works.

Which algorithm should I use?

For integrity verification, use SHA-256 — it's the modern standard. MD5 and SHA-1 are provided because many older systems and download pages still publish them, but they are cryptographically broken and shouldn't secure anything new.

Why does my hash not match the published one?

The most common causes: hashing the text with a trailing newline or different encoding, comparing against a different algorithm, or a genuinely different (corrupted/modified) file. Also check whether the published value is uppercase — use the uppercase toggle to compare visually.

Can hashes be reversed to reveal my data?

No. Hash functions are one-way; the original input cannot be reconstructed from the digest. However, short common inputs (like simple passwords) can be found via lookup tables, which is why passwords should be salted and never stored as plain hashes.