Application

Git

Every Git object is content-addressed by the SHA-1 of a tiny header plus its contents. This page reproduces that calculation byte-for-byte for a blob , you can paste any file content and match the result against git hash-object in your terminal.

blob <byteLength>\0<content>

That single string is what Git hashes to identify a file’s object ID. The header binds the object type and exact size so a blob and a tree and a commit with the same body cannot collide.

File contents (everything, including trailing newlines)

12 bytes

Git object ID

Verify in your terminal

echo -n "hello world\n" > /tmp/blob.txt
git hash-object /tmp/blob.txt          # SHA-1