diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e097a402317..27af59ebdea0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 - The entry editor is now open by default when JabRef starts up. [#5460](https://github.com/JabRef/jabref/issues/5460)
 - We added a new ADS fetcher to use the new ADS API [#4949](https://github.com/JabRef/jabref/issues/4949)
 - We added support of the [X11 primary selection](https://unix.stackexchange.com/a/139193/18033) [#2389](https://github.com/JabRef/jabref/issues/2389)
+- We added support to switch between biblatex and bibtex library types. [#5550](https://github.com/JabRef/jabref/issues/5550)
 
 ### Fixed
 
diff --git a/src/main/java/org/jabref/gui/JabRefFrame.java b/src/main/java/org/jabref/gui/JabRefFrame.java
index e5bb490340dc..71f05f986332 100644
--- a/src/main/java/org/jabref/gui/JabRefFrame.java
+++ b/src/main/java/org/jabref/gui/JabRefFrame.java
@@ -61,6 +61,7 @@
 import org.jabref.gui.edit.ManageKeywordsAction;
 import org.jabref.gui.edit.MassSetFieldsAction;
 import org.jabref.gui.edit.OpenBrowserAction;
+import org.jabref.gui.editmode.EditModeAction;
 import org.jabref.gui.exporter.ExportCommand;
 import org.jabref.gui.exporter.ExportToClipboardAction;
 import org.jabref.gui.exporter.ManageCustomExportsAction;
@@ -737,7 +738,11 @@ private MenuBar createMenu() {
                 factory.createMenuItem(StandardActions.EDIT_PREAMBLE, new PreambleEditor(stateManager, undoManager, this.getDialogService())),
                 factory.createMenuItem(StandardActions.EDIT_STRINGS, new BibtexStringEditorAction(stateManager)),
                 factory.createMenuItem(StandardActions.MANAGE_CITE_KEY_PATTERNS, new BibtexKeyPatternAction(this, stateManager)),
-                factory.createMenuItem(StandardActions.MASS_SET_FIELDS, new MassSetFieldsAction(stateManager, dialogService, undoManager))
+                factory.createMenuItem(StandardActions.MASS_SET_FIELDS, new MassSetFieldsAction(stateManager, dialogService, undoManager)),
+
+                new SeparatorMenuItem(),
+
+                factory.createMenuItem(StandardActions.CHANGE_LIBRARY_TYPE, new EditModeAction(dialogService, stateManager))
         );
 
         Menu lookupIdentifiers = factory.createSubMenu(StandardActions.LOOKUP_DOC_IDENTIFIER);
diff --git a/src/main/java/org/jabref/gui/actions/StandardActions.java b/src/main/java/org/jabref/gui/actions/StandardActions.java
index 87f48f1b4a53..5b879662e45a 100644
--- a/src/main/java/org/jabref/gui/actions/StandardActions.java
+++ b/src/main/java/org/jabref/gui/actions/StandardActions.java
@@ -124,6 +124,7 @@ public enum StandardActions implements Action {
     LIBRARY_PROPERTIES(Localization.lang("Library properties")),
     EDIT_PREAMBLE(Localization.lang("Edit preamble")),
     EDIT_STRINGS(Localization.lang("Edit string constants"), IconTheme.JabRefIcons.EDIT_STRINGS, KeyBinding.EDIT_STRINGS),
+    CHANGE_LIBRARY_TYPE(Localization.lang("Change library type (biblatex/bibtex)")),
 
     FIND_DUPLICATES(Localization.lang("Find duplicates"), IconTheme.JabRefIcons.FIND_DUPLICATES),
     MERGE_ENTRIES(Localization.lang("Merge entries"), IconTheme.JabRefIcons.MERGE_ENTRIES),
diff --git a/src/main/java/org/jabref/gui/editmode/EditModeAction.java b/src/main/java/org/jabref/gui/editmode/EditModeAction.java
new file mode 100644
index 000000000000..2c242b926b6f
--- /dev/null
+++ b/src/main/java/org/jabref/gui/editmode/EditModeAction.java
@@ -0,0 +1,47 @@
+package org.jabref.gui.editmode;
+
+import org.jabref.gui.DialogService;
+import org.jabref.gui.StateManager;
+import org.jabref.gui.actions.SimpleCommand;
+import org.jabref.logic.l10n.Localization;
+import org.jabref.model.database.BibDatabaseContext;
+import org.jabref.model.database.BibDatabaseMode;
+
+import java.util.Optional;
+
+import static org.jabref.gui.actions.ActionHelper.needsDatabase;
+
+public class EditModeAction extends SimpleCommand {
+
+    private final DialogService dialogService;
+    private StateManager stateManager;
+
+    public EditModeAction(DialogService dialogService, StateManager stateManager) {
+        this.dialogService = dialogService;
+        this.stateManager = stateManager;
+
+        this.executable.bind(needsDatabase(stateManager));
+    }
+
+    @Override
+    public void execute() {
+        Optional<BibDatabaseContext> currentDatabase = stateManager.getActiveDatabase();
+        if (currentDatabase.isEmpty()) {
+            return;
+        }
+
+        BibDatabaseMode newMode = currentDatabase.get().getMode()
+                .getOppositeMode();
+
+        boolean result = dialogService.showConfirmationDialogAndWait(
+                Localization.lang("Library Type Change"),
+                Localization.lang("Are you sure you want to change your library type to '%0'?", newMode.getAsString()),
+                Localization.lang("Convert"));
+
+        if (!result) {
+            return;
+        }
+
+        currentDatabase.get().setMode(newMode);
+    }
+}
diff --git a/src/main/resources/l10n/JabRef_en.properties b/src/main/resources/l10n/JabRef_en.properties
index 9325f1421b6c..d50f4a45765f 100644
--- a/src/main/resources/l10n/JabRef_en.properties
+++ b/src/main/resources/l10n/JabRef_en.properties
@@ -2126,3 +2126,7 @@ Start\ on\ second\ duplicate\ key\ with\ letter\ B\ (b,\ c,\ ...)=Start on secon
 Always\ add\ letter\ (a,\ b,\ ...)\ to\ generated\ keys=Always add letter (a, b, ...) to generated keys
 Default\ pattern=Default pattern
 Reset\ %s\ to\ default\ value=Reset %s to default value
+
+Library\ Type\ Change=Library Type Change
+Are\ you\ sure\ you\ want\ to\ change\ your\ library\ type\ to\ '%0'?=Are you sure you want to change your library type to '%0'?
+Change\ library\ type\ (biblatex/bibtex)=Change library type (biblatex/bibtex)