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<body class="manpage">
<div id="header">
<h1>
gitformat-loose(5) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>gitformat-loose -
Git loose object format
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content">$GIT_DIR/objects/[0-9a-f][0-9a-f]/*</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Loose objects are how Git stores individual objects, where every object is
written as a separate file.</p></div>
<div class="paragraph"><p>Over the lifetime of a repository, objects are usually written as loose objects
initially. Eventually, these loose objects will be compacted into packfiles
via repository maintenance to improve disk space usage and speed up the lookup
of these objects.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_loose_objects">Loose objects</h2>
<div class="sectionbody">
<div class="paragraph"><p>Each loose object contains a prefix, followed immediately by the data of the
object. The prefix contains <em><type></em> <em><size></em><code>\0</code>. <em><type></em> is one of <code>blob</code>,
<code>tree</code>, <code>commit</code>, or <code>tag</code> and <code>size</code> is the size of the data (without the
prefix) as a decimal integer expressed in ASCII.</p></div>
<div class="paragraph"><p>The entire contents, prefix and data concatenated, is then compressed with zlib
and the compressed data is stored in the file. The object ID of the object is
the SHA-1 or SHA-256 (as appropriate) hash of the uncompressed data.</p></div>
<div class="paragraph"><p>The file for the loose object is stored under the <code>objects</code> directory, with the
first two hex characters of the object ID being the directory and the remaining
characters being the file name. This is done to shard the data and avoid too
many files being in one directory, since some file systems perform poorly with
many items in a directory.</p></div>
<div class="paragraph"><p>As an example, the empty tree contains the data (when uncompressed) <code>tree</code> <code>0\0</code>
and, in a SHA-256 repository, would have the object ID
<code>6ef19b41225c5369f1c104d45d8d85efa9b057b53b14b4b9b939dd74decc5321</code> and would be
stored under
<code>$GIT_DIR/objects/6e/f19b41225c5369f1c104d45d8d85efa9b057b53b14b4b9b939dd74decc5321</code>.</p></div>
<div class="paragraph"><p>Similarly, a blob containing the contents <code>abc</code> would have the uncompressed
data of <code>blob</code> <code>3\0abc</code>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
2025-11-17 16:38:17 UTC
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