Calculate file hash
Calculate your file’s hash values using common algorithms. Your file stays on your device and is never uploaded anywhere.
- MD5, SHA-1, SHA-256, SHA-384 and SHA-512
- Free
- All file types supported
- Local, with no upload
Drop your file here
or select it directly from your device.
Calculations run on your device, with no upload or storage.
File hashes directly in your browser
Calculate your file’s checksums and compare them with a published reference.
100% local in your browser
All calculations run on your device. Your file is never sent to Blazelock or any other server.
Common hash algorithms
Get MD5, SHA-1, SHA-256, SHA-384 and SHA-512 at once. Calculation starts automatically when you select a file.
Works with every file type
Calculate hashes for documents, images, archives, programs and any other file format.
Copy hashes directly
Copy hashes with one click to compare them with checksums from a trusted source.
How to calculate your file’s hashes
Select a file, let the tool calculate its hashes and copy the result you need to compare with a checksum from a trusted source.
Select a file: Drag your file into the drop zone or click “Select file”.
Wait for calculation: Calculation starts automatically. Wait for all five hashes.
Use the hash: Copy the hash you need and paste it wherever you want to use it.
Frequently asked questions
No. Calculation takes place entirely in your browser. Neither your file nor the calculated hashes are sent to Blazelock or any other server, and the tool does not store them permanently.
A file hash is a checksum calculated from your file’s contents. Identical file contents always produce the same hash when the same algorithm is used. You can use it to compare your file with a published checksum.
The tool supports MD5, SHA-1, SHA-256, SHA-384 and SHA-512. All five hashes are calculated automatically when you select a file. MD5 and SHA-1 are cryptographically outdated.
A hash is not an encrypted copy of your file and cannot simply be reversed. However, known files can be identified by comparing their hashes.
No. A matching hash is an indication that your file matches the reference you used. However, the reference file may also contain malware. A hash comparison is therefore no substitute for a virus scan.
Protect your applications from malicious files
Use Blazelock to integrate malware scanning into your applications and existing workflows. We run the scanner infrastructure.
