Hash Toolkit · File integrity
File HMAC Generator
Stream files directly in your browser, supply the shared secret, and produce keyed hashes for release validation, webhook signing, or firmware distribution. Prefer text inputs? Try the HMAC text tool →
File HMAC generator
Build keyed hashes for archives, firmware, or API payloads without uploading any files. Provide the same key used by your service and verify MACs locally.
Upload a file
Click to browse or drag & drop files here
Re-run the computation after changing the algorithm, key, or output encoding.
Select a file and enter a digest to validate.
Why compute HMACs for files?
HMACs provide integrity and authenticity, ensuring only holders of the shared secret can create or validate the digest. They are ideal for webhook signatures, firmware updates, or any payload that needs tamper detection without asymmetric keys.
CipherTools reads your file in streaming chunks, never uploading content to a server. Close the tab or clear your browser data to remove any residual references from memory.