Privacy File Tools
Checksum calculator
Calculate file checksums with SHA-256, SHA-1 and MD5. Verify file integrity and detect corruption. Everything runs locally in your browser.
100% local.Your file is processed in your browser and is never uploaded.
Drag & drop a file here
or click to browse
Frequently asked questions
- What is a checksum?
- A checksum is a short, fixed-length string generated by a hash algorithm from the contents of a file. It is used to verify data integrity — if the file changes even slightly, the checksum changes completely.
- How do I calculate a file checksum?
- Upload or drag your file into the tool. It computes SHA-256, SHA-1 and MD5 checksums instantly in your browser. No file data is sent to any server.
- Which checksum algorithm should I use?
- SHA-256 is recommended for most purposes. It is secure and widely supported. SHA-1 is being phased out but is still used in some contexts. MD5 is only for legacy compatibility and is not secure against intentional tampering.