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+<title>File Format Changes in SQLite</title>
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+
+
+<h2>File Format Changes in SQLite</h2>
+
+<p>
+The <a href="fileformat2.html">underlying file format</a> for SQLite databases does not
+change in incompatible ways.  There are literally trillions of
+SQLite database files in circulation and the SQLite developers are
+committing to supporting those files for decades into the future.
+</p>
+
+<p>
+Prior to SQLite version 3.0.0 (2004-06-18), the file format did
+sometimes change from one release to the next.  But since that time,
+the file format has been fully backwards compatible.
+</p>
+
+<p>
+By "backwards compatible" we mean that
+newer versions of SQLite can always read and write database files created
+by older versions of SQLite.
+It is often also the case that SQLite is "forwards compatible", that
+older versions of SQLite can read and write database files created by
+newer versions of SQLite.  But there are sometimes forward compatibility
+breaks.  Sometimes new features are added to the file format.  For
+example, <a href="wal.html">WAL mode</a> was added in version 3.7.0 (2010-07-21).  
+SQLite 3.7.0 and later can read and write all database files created
+by earlier versions of SQLite.  And earlier versions of SQLite can
+read and write database files created by SQLite 3.7.0 and later
+<i>as long as the database does not use WAL mode</i>.  But versions of
+SQLite prior to version 3.7.0 cannot read nor write SQLite database files
+that make use of WAL mode.
+</p>
+
+<h2>Summary</h2>
+
+<ul>
+<li><p>
+Newer versions of SQLite can always read and/or write database files
+created by older versions of SQLite, back to version 3.0.0 (2004-06-18).
+
+<li><p>
+Older versions of SQLite back to version 3.0.0 can read and write
+database files created by newer versions of SQLite as long as the
+database does not make use of newer features that are unknown to that
+older version.
+</ul>
+<p align="center"><small><i>This page last modified on  <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink"  data-href="https://sqlite.org/docsrc/finfo/pages/formatchng.in?m=8415958e0a89646dc">2022-09-13 14:04:46</a> UTC </small></i></p>
+