diff --git a/app/src/main/java/org/thoughtcrime/securesms/logsubmit/SubmitDebugLogActivity.java b/app/src/main/java/org/thoughtcrime/securesms/logsubmit/SubmitDebugLogActivity.java
index b8dcc3e480..87de54ae48 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/logsubmit/SubmitDebugLogActivity.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/logsubmit/SubmitDebugLogActivity.java
@@ -61,11 +61,14 @@ public class SubmitDebugLogActivity extends BaseActivity {
   private MenuItem searchMenuItem;
   private MenuItem saveMenuItem;
 
-  private ImageButton        caseSensitiveButton;
-  private TextView           searchPosition;
-  private ImageButton        searchUpButton;
-  private ImageButton        searchDownButton;
+  private ImageButton filterButton;
+  private ImageButton caseSensitiveButton;
+  private TextView    searchPosition;
+  private ImageButton searchUpButton;
+  private ImageButton searchDownButton;
 
+  private boolean isCaseSensitive;
+  private boolean isFiltered;
   private boolean isWebViewLoaded;
   private boolean hasPresentedLines;
 
@@ -101,6 +104,7 @@ public class SubmitDebugLogActivity extends BaseActivity {
     this.saveMenuItem   = menu.findItem(R.id.menu_save);
 
     this.searchNav            = findViewById(R.id.debug_log_search_nav);
+    this.filterButton         = findViewById(R.id.debug_log_filter);
     this.caseSensitiveButton  = findViewById(R.id.case_sensitive_button);
     this.searchPosition       = findViewById(R.id.debug_log_search_position);
     this.searchUpButton       = findViewById(R.id.debug_log_search_up);
@@ -116,17 +120,34 @@ public class SubmitDebugLogActivity extends BaseActivity {
       DebugLogsViewer.getSearchPosition(logWebView, position -> searchPosition.setText(position));
     });
 
-    boolean[] isCaseSensitive = {false};
-
     caseSensitiveButton.setOnClickListener(v -> {
       DebugLogsViewer.onToggleCaseSensitive(logWebView);
       DebugLogsViewer.getSearchPosition(logWebView, position -> searchPosition.setText(position));
-      isCaseSensitive[0] = !isCaseSensitive[0];
+      isCaseSensitive = !isCaseSensitive;
 
-      int backgroundColor = isCaseSensitive[0] ? R.drawable.circle_tint_darker : R.drawable.circle_touch_highlight_background;
+      int backgroundColor = isCaseSensitive ? R.drawable.circle_tint_darker : R.drawable.circle_touch_highlight_background;
       caseSensitiveButton.setBackground(getResources().getDrawable(backgroundColor));
     });
 
+    filterButton.setOnClickListener(v -> {
+      isFiltered = !isFiltered;
+      if (isFiltered) {
+        DebugLogsViewer.onFilter(logWebView);
+        searchPosition.setVisibility(View.GONE);
+        searchUpButton.setVisibility(View.GONE);
+        searchDownButton.setVisibility(View.GONE);
+        filterButton.setBackground(getResources().getDrawable(R.drawable.circle_tint_darker));
+      } else {
+        DebugLogsViewer.onFilterClose(logWebView);
+        searchPosition.setVisibility(View.VISIBLE);
+        searchUpButton.setVisibility(View.VISIBLE);
+        searchDownButton.setVisibility(View.VISIBLE);
+        DebugLogsViewer.getSearchPosition(logWebView, position -> searchPosition.setText(position));
+        DebugLogsViewer.scrollToTop(logWebView);
+        filterButton.setBackground(getResources().getDrawable(R.drawable.circle_touch_highlight_background));
+      }
+    });
+
     SearchView searchView = (SearchView) searchMenuItem.getActionView();
     SearchView.OnQueryTextListener queryListener = new SearchView.OnQueryTextListener() {
       @Override
@@ -136,8 +157,13 @@ public class SubmitDebugLogActivity extends BaseActivity {
 
       @Override
       public boolean onQueryTextChange(String query) {
-        DebugLogsViewer.onSearch(logWebView, query);
-        DebugLogsViewer.getSearchPosition(logWebView, position -> searchPosition.setText(position));
+        DebugLogsViewer.onSearchInput(logWebView, query);
+        if (isFiltered) {
+          DebugLogsViewer.onFilter(logWebView);
+        } else {
+          DebugLogsViewer.onSearch(logWebView);
+          DebugLogsViewer.getSearchPosition(logWebView, position -> searchPosition.setText(position));
+        }
         return true;
       }
     };
@@ -156,6 +182,7 @@ public class SubmitDebugLogActivity extends BaseActivity {
         searchNav.setVisibility(View.GONE);
         submitButton.setVisibility(View.VISIBLE);
         DebugLogsViewer.onSearchClose(logWebView);
+        DebugLogsViewer.onFilterClose(logWebView);
         DebugLogsViewer.getSearchPosition(logWebView, position -> searchPosition.setText(position));
         searchView.setOnQueryTextListener(null);
         return true;
diff --git a/app/src/main/res/layout/submit_debug_log_activity.xml b/app/src/main/res/layout/submit_debug_log_activity.xml
index 2e692fb3e0..1c1157a711 100644
--- a/app/src/main/res/layout/submit_debug_log_activity.xml
+++ b/app/src/main/res/layout/submit_debug_log_activity.xml
@@ -98,16 +98,33 @@
       app:layout_constraintBottom_toBottomOf="parent"
       tools:visibility="visible">
 
+    <ImageButton
+        android:id="@+id/debug_log_filter"
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:background="@drawable/circle_touch_highlight_background"
+        android:layout_marginTop="8dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginBottom="8dp"
+        android:padding="8dp"
+        android:src="@drawable/symbol_filter_24"
+        app:tint="@color/signal_colorOnSurface"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent" />
+
     <ImageButton
         android:id="@+id/case_sensitive_button"
         android:layout_width="40dp"
         android:layout_height="40dp"
         android:background="@drawable/circle_touch_highlight_background"
-        android:layout_marginStart="16dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginBottom="8dp"
         android:padding="8dp"
         android:src="@drawable/symbol_match_case_24"
         app:tint="@color/signal_colorOnSurface"
-        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/debug_log_filter"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toBottomOf="parent" />
 
diff --git a/debuglogs-viewer/lib/src/main/assets/debuglogs-viewer.js b/debuglogs-viewer/lib/src/main/assets/debuglogs-viewer.js
index 5887192e5b..1eaf9b7f99 100644
--- a/debuglogs-viewer/lib/src/main/assets/debuglogs-viewer.js
+++ b/debuglogs-viewer/lib/src/main/assets/debuglogs-viewer.js
@@ -52,11 +52,13 @@ editor.session.on("changeScrollLeft", showScrollBar);
 const Range = ace.require("ace/range").Range;
 const session = editor.getSession();
 
+let logLines = ""; // Original logLines
 let input = ""; // Search query input
 let markers = []; // IDs of highlighted search markers
 let matchRanges = []; // Ranges of all search matches
 let matchCount = 0; // Total number of matches
 let isCaseSensitive = false;
+let isFiltered = false;
 
 // Clear all search markers and match info
 function clearMarkers() {
@@ -139,10 +141,34 @@ function onSearchClose() {
 
 function onToggleCaseSensitive() {
   isCaseSensitive = !isCaseSensitive;
-  highlightAllMatches(input);
+  (isFiltered) ? onFilter() : highlightAllMatches(input);
 }
 
 function onSearchInput(value) {
   input = value;
+}
+
+function onSearch() {
   highlightAllMatches(input);
 }
+
+function onFilter() {
+  isFiltered = true;
+  editor.getSelection().clearSelection();
+  clearMarkers();
+  const filtered = logLines
+    .split("\n")
+    .filter((line) => {
+      const newLine = isCaseSensitive ? line : line.toLowerCase();
+      return newLine.includes(isCaseSensitive ? input : input.toLowerCase());
+    })
+    .join("\n");
+
+  editor.setValue(filtered, -1);
+}
+
+function onFilterClose() {
+  isFiltered = false;
+  editor.setValue(logLines, -1);
+  highlightAllMatches(input);
+}
\ No newline at end of file
diff --git a/debuglogs-viewer/lib/src/main/java/org/signal/debuglogsviewer/DebugLogsViewer.kt b/debuglogs-viewer/lib/src/main/java/org/signal/debuglogsviewer/DebugLogsViewer.kt
index 388cbe2766..2168cf43a6 100644
--- a/debuglogs-viewer/lib/src/main/java/org/signal/debuglogsviewer/DebugLogsViewer.kt
+++ b/debuglogs-viewer/lib/src/main/java/org/signal/debuglogsviewer/DebugLogsViewer.kt
@@ -47,7 +47,7 @@ object DebugLogsViewer {
   fun presentLines(webview: WebView, lines: String) {
     // Set the debug log lines
     val escaped = JSONObject.quote(lines)
-    webview.evaluateJavascript("editor.insert($escaped);", null)
+    webview.evaluateJavascript("editor.insert($escaped); logLines=$escaped;", null)
   }
 
   @JvmStatic
@@ -61,10 +61,25 @@ object DebugLogsViewer {
   }
 
   @JvmStatic
-  fun onSearch(webview: WebView, query: String) {
+  fun onSearchInput(webview: WebView, query: String) {
     webview.evaluateJavascript("onSearchInput('$query')", null)
   }
 
+  @JvmStatic
+  fun onSearch(webview: WebView) {
+    webview.evaluateJavascript("onSearch()", null)
+  }
+
+  @JvmStatic
+  fun onFilter(webview: WebView) {
+    webview.evaluateJavascript("onFilter()", null)
+  }
+
+  @JvmStatic
+  fun onFilterClose(webview: WebView) {
+    webview.evaluateJavascript("onFilterClose()", null)
+  }
+
   @JvmStatic
   fun onSearchUp(webview: WebView) {
     webview.evaluateJavascript("onSearchUp();", null)
@@ -90,10 +105,6 @@ object DebugLogsViewer {
     webview.evaluateJavascript("onSearchClose();", null)
   }
 
-  @JvmStatic
-  fun onFilter(webview: WebView) {
-  }
-
   @JvmStatic
   fun onEdit(webview: WebView) {
     readOnly = !readOnly