File Checksum Generator
Securely generate MD5, SHA-1, SHA-256, and SHA-512 checksums for any file directly in your browser to verify its integrity. No uploads required.
A checksum (or hash) is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage. It's like a unique digital fingerprint for a file. By comparing the checksum of a file you received with the one provided by the original source, you can be virtually certain that the file has not been altered or corrupted.
Even a tiny change in the file—a single bit—will result in a completely different checksum.
- Download the file you want to verify (e.g., a software installation package).
- Find the official checksum provided by the software vendor on their website. It's usually a long string of letters and numbers labeled as 'MD5' or 'SHA256'.
- Upload the downloaded file into this tool and click 'Generate Hashes'.
- Compare the generated hash with the one from the website. If they match exactly, your file is authentic and uncorrupted. If they don't match, do not open the file and try downloading it again.
Which algorithm should I use?
SHA-256 is the current industry standard for security and integrity checks. MD5 and SHA-1 are older and considered less secure against deliberate collisions, but are still widely used for non-security-critical file integrity checks because they are faster to compute.
Is my file uploaded to a server?
No, never. This tool is built for privacy. The entire process of reading the file and calculating its hashes happens locally in your web browser. Your data never leaves your computer.
Is there a file size limit?
Since the tool runs entirely in your browser, its performance depends on your computer's memory and CPU. It's designed for common file sizes up to a few hundred megabytes. Very large files (multiple gigabytes) may cause your browser to slow down or become unresponsive.