Git Commit Hash Generator
Calculate exact SHA-1 hashes and understand how Git builds commit objects.
Commit Details
Results
Generated SHA-1 Hash
Raw Commit Object String
This is the exact string Git hashes. Notice the commit [size]\0 prefix.
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How Git Hashes Really Work
When you run git commit, Git doesn't just hash your source code. It creates a structured text document called a Commit Object and hashes that document using the SHA-1 algorithm.
This tool recreates the exact string building process Git uses internally in its C codebase, allowing you to generate the same 40-character hexadecimal IDs Git produces.
The Object Header
Before hashing the commit details, Git prepends a specific header: commit [byte_size]\0. Without this header and the null byte (\0), the resulting SHA-1 hash will not match Git's output.
Trees and Parents
A commit points to a Tree (a hash representing your directory at that point in time) and a Parent (the hash of the previous commit). The very first commit in a repository (the root) has no parent.
Author vs Committer
Git records both who originally wrote the code (the Author) and who applied it to the repository (the Committer). Each entry includes their name, email, a unix timestamp, and their timezone offset.
The SHA-1 Algorithm
Git passes the complete, formatted string through the SHA-1 cryptographic hash function. Changing even a single second in the timestamp or a single comma in the message cascades into a completely different 40-character hash.
Frequently Asked Questions
git cat-file -p HEAD or git ls-tree HEAD in your terminal.
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