GotoKit Online Hash Generator

Free online hash generator powered by the browser’s native Web Crypto API and pure JavaScript MD5 implementation. All computation happens locally; no data is ever uploaded. Supports both text input and file upload modes, generating MD5, SHA1, SHA256, SHA384, and SHA512 hashes.

Key Features

• Five algorithms : MD5, SHA1, SHA256, SHA384, SHA512 — SHA family uses the browser’s native crypto interface; MD5 uses a pure JavaScript implementation
• Dual input modes : Type text directly or drag & drop any file (up to 100MB, chunked reading for smooth performance)
• Live update toggle : When enabled, hashes are computed as you type; when disabled, click the button or press Ctrl+Enter
• Case toggle : Switch each hash between uppercase and lowercase independently
• HMAC mode : Enter a secret key to generate keyed HMAC hashes for API signing and message authentication
• One-click copy : Individual copy buttons per algorithm plus a “Copy All Hashes” button at the bottom
• File progress bar : Shows reading progress when processing large files
• 100% private : All computation happens in your browser; files never leave your device

How to Use

1. Choose Text or File mode
2. Enter text or drop a file
3. Optional: enter an HMAC key for HMAC mode
4. Optional: enable “Live update” for real-time computation
5. Click “Generate Hash” or press Ctrl+Enter
6. View all five hash results and copy or toggle case

Use Cases

• Verify file download integrity (MD5/SHA256 comparison)
• Generate API request signatures (HMAC-SHA256)
• Password hashing (SHA256/SHA512)
• File deduplication
• Blockchain/digital signature development and debugging

Notes

• MD5 and SHA1 are no longer suitable for security use; use them for checksums and backward compatibility only
• File hashing is computed entirely in the browser; large files may take a few seconds
• All algorithms participate in HMAC mode when a key is provided
• Built purely on Web Crypto API + JavaScript