Checksum Verifier
📦 Checksum Verifier Source Code $4.99
Get the complete, ready‑to‑deploy HTML file with all styling and logic. This is the exact code powering the demo above — no dependencies, fully offline, and 100% client‑side. Perfect for your portfolio, client projects, or resale. One-time purchase, lifetime access.
What is a Checksum Verifier?
A checksum verifier computes a cryptographic hash of text or a file and compares it to a known checksum to confirm data integrity. It supports MD5, SHA‑1, SHA‑256, and SHA‑512. By comparing the computed hash with an expected value, you can verify that a downloaded file hasn't been corrupted or tampered with. The tool runs entirely in your browser, so your data stays private and secure.
How to Use
- Provide input by typing text directly or uploading a file. You can use either method—the text area takes precedence if both are present.
- Select the hash algorithm (MD5, SHA‑1, SHA‑256, SHA‑512) and optionally paste an expected checksum to verify.
- Click "Generate Hash" to compute the hash. The result appears on the right. If an expected hash was provided, the tool will indicate whether they match.
Frequently Asked Questions
Is my data safe? Does anything get uploaded?
Absolutely. All hashing is performed locally inside your browser. No data, text, or files are ever transmitted, stored, or logged. You can safely verify sensitive documents or proprietary files.
Does this tool work offline?
Yes, completely. There are no external libraries or server calls. Save the HTML file and you'll have a working checksum verifier available anytime, even without an internet connection.
Why are there separate options for text and file input?
The text area is convenient for small strings, while the file upload handles binary files. If you provide both, the text input takes priority. For very large files, processing is limited to the first 50MB to keep the tool responsive.
Disclaimer: This tool performs all operations locally in your browser. No data is stored, transmitted, or logged.