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Git Commit Hash Generator

Calculate exact SHA-1 hashes and understand how Git builds commit objects.

Commit Details

Results

Generated SHA-1 Hash

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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 hashes are extremely sensitive. To get an exact match, your inputted Tree Hash, Parent Hash, Author details, Committer details, timestamps, and the commit message (including exact newlines and spacing) must match the original commit byte-for-byte.
The null byte (represented as `\x00` or `\0`) is a special unprintable character that Git uses to separate the object header (e.g., `commit 214`) from the actual object content in memory before hashing it.
Yes. Although SHA-1 is considered cryptographically "broken" for security purposes (like SSL certificates), Git still uses it for data integrity and object identification. A migration to SHA-256 is in progress within the Git project.
You can view the tree hash associated with any commit in your local repository by running git cat-file -p HEAD or git ls-tree HEAD in your terminal.

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