The free online File Hash Checker tool helps calculate and check SHA-1, SHA-256 hashes of files for free, quickly and accurately. Verify file integrity by comparing the hash with the original source to ensure the file has not been altered, corrupted, or infected with malware. Processed entirely in the browser using Web Crypto API - files are not uploaded to the server, ensuring absolute security. Supports file drag and drop, copy hash with one click, automatic hash comparison. Essential tool for developers, IT professionals, and users concerned about security when downloading software, ISO files, or receiving important files.
Outstanding features
Calculate the SHA-1 and SHA-256 hashes of any file
Compare the automatic hash with the hash provided from the source
100% processed in browser using Web Crypto API - no file upload
Drag and drop files or click to select files from your computer
Copy hash with one click on clipboard
Display comparison results clearly: match (green) or mismatch (red)
Display file information: file name and size
Supports all file types: exe, iso, zip, pdf, images, videos...
Unlimited file size (depends on browser memory)
Simple, intuitive, easy-to-use interface
Completely free, no account registration required
Responsive design - works well on all devices
Why is it necessary to check the hash of the file? Security and integrity
Hash (checksum) is
Benefits when used
•Verify file integrity after download - ensure the file is not corrupt
•Detect files changed by malware or attacker
•Confirm the received file is the original file from a trusted source
•Security when downloading software, ISO, firmware from the internet
•Check the file before installing or running on the system
•Compare whether two files are similar by comparing hash
•Audit and compliance - prove files have not been changed
•Absolute security - files are not uploaded to the server
Detailed instructions on how to check file hash online
1Drag and drop files into the upload area or click to select files from your computer
2Wait a few seconds for the tool to calculate the hash (time depends on file size)
3See the SHA-1 and SHA-256 hash results displayed
4Copy hashes by clicking the Copy icon next to each hash
5To verify: paste the hash from the original source (download website) into the box
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