diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca63564..3ea1c6e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,6 +54,10 @@ two confirmed bugs).
 
 ### Added
 
+- **Sidebar logo in the fullscreen vault tab.** The
+  `vault-sidebar__header` now renders the 16-optimized SVG logo
+  inline before the "Relicario" wordmark (20×20 px, `flex-shrink: 0`
+  so it survives narrow-pane wraps). Popup unaffected.
 - **Password coloring (P1).** Revealed passwords in the popup
   item-detail, fullscreen item view, field-history viewer, and
   generator preview render digits and symbols in distinct colors.
diff --git a/extension/src/vault/vault.css b/extension/src/vault/vault.css
index 6555200..c1d1639 100644
--- a/extension/src/vault/vault.css
+++ b/extension/src/vault/vault.css
@@ -1290,6 +1290,13 @@ textarea {
   align-items: center;
   gap: 8px;
 }
+.vault-sidebar__header .brand-logo {
+  width: 20px;
+  height: 20px;
+  margin: 0;
+  display: block;
+  flex-shrink: 0;
+}
 
 .vault-sidebar__search {
   padding: 8px 12px;
diff --git a/extension/src/vault/vault.ts b/extension/src/vault/vault.ts
index d30c2c1..ba91bc6 100644
--- a/extension/src/vault/vault.ts
+++ b/extension/src/vault/vault.ts
@@ -258,6 +258,7 @@ function renderShell(app: HTMLElement): void {
     app.innerHTML = `
       <div class="vault-sidebar">
         <div class="vault-sidebar__header">
+          <img class="brand-logo" src="icons/relicario-logo-16.svg" alt="">
           <span class="brand">Relicario</span>
         </div>
         <div class="vault-sidebar__search">