diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5395019c3..0744a53fe 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -90,7 +90,7 @@ See [docs/contributing/release-process.md](./docs/contributing/release-process.m
 - `src/main/java/com/demcha/compose/document/layout`
   Canonical functional layout pipeline: `LayoutCompiler`, `BuiltInNodeDefinitions`, `TableLayoutSupport`, `PreparedNode`, `PlacedFragment`
 - `src/main/java/com/demcha/compose/document/backend/fixed/pdf`
-  PDF backend: `PdfFixedLayoutBackend`, fragment handlers, and the option translators that bridge canonical types to PDFBox
+  PDF backend: `PdfFixedLayoutBackend`, fragment handlers, the option translators that bridge canonical types to PDFBox, and `FontShowcase` (bundled-font preview renderer)
 - `src/main/java/com/demcha/compose/document/backend/semantic`
   Semantic exporters: `DocxSemanticBackend` (Apache POI based), `PptxSemanticBackend` (manifest skeleton)
 - `src/main/java/com/demcha/compose/document/templates/*`
@@ -98,7 +98,7 @@ See [docs/contributing/release-process.md](./docs/contributing/release-process.m
 - `src/main/java/com/demcha/compose/engine/*`
   Internal shared engine foundation under the canonical surface (measure, paginate, place, render). Not part of the recommended public API
 - `src/main/java/com/demcha/compose/font`
-  Public font registry, `FontName`, default fonts, `FontShowcase`
+  Public font registry, `FontName`, default fonts
 - `src/test/java/com/demcha/documentation/*`
   Examples used to keep README/documentation snippets honest
 - `src/test/java/com/demcha/compose/engine/integration/*`
diff --git a/src/main/java/com/demcha/compose/GraphCompose.java b/src/main/java/com/demcha/compose/GraphCompose.java
index c9f877f8c..d27bce5b1 100644
--- a/src/main/java/com/demcha/compose/GraphCompose.java
+++ b/src/main/java/com/demcha/compose/GraphCompose.java
@@ -2,7 +2,7 @@
 
 import com.demcha.compose.font.FontFamilyDefinition;
 import com.demcha.compose.font.FontName;
-import com.demcha.compose.font.FontShowcase;
+import com.demcha.compose.document.backend.fixed.pdf.FontShowcase;
 import com.demcha.compose.font.DefaultFonts;
 import com.demcha.compose.document.api.DocumentPageSize;
 import com.demcha.compose.document.api.DocumentSession;
diff --git a/src/main/java/com/demcha/compose/font/FontShowcase.java b/src/main/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcase.java
similarity index 80%
rename from src/main/java/com/demcha/compose/font/FontShowcase.java
rename to src/main/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcase.java
index 65b5f661f..8164ad9ad 100644
--- a/src/main/java/com/demcha/compose/font/FontShowcase.java
+++ b/src/main/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcase.java
@@ -1,4 +1,4 @@
-package com.demcha.compose.font;
+package com.demcha.compose.document.backend.fixed.pdf;
 
 import com.demcha.compose.GraphCompose;
 import com.demcha.compose.document.api.DocumentPageSize;
@@ -9,6 +9,8 @@
 import com.demcha.compose.document.style.DocumentInsets;
 import com.demcha.compose.document.style.DocumentTextDecoration;
 import com.demcha.compose.document.style.DocumentTextStyle;
+import com.demcha.compose.font.DefaultFonts;
+import com.demcha.compose.font.FontName;
 
 import java.awt.Color;
 import java.nio.file.Path;
@@ -28,6 +30,12 @@ public final class FontShowcase {
     private FontShowcase() {
     }
 
+    /**
+     * Renders a preview of every bundled font family to a PDF file on disk.
+     *
+     * @param outputFile destination path for the generated preview PDF
+     * @throws Exception if the document cannot be built or written
+     */
     public static void renderAvailableFontsPreview(Path outputFile) throws Exception {
         try (DocumentSession document = GraphCompose.document(outputFile)
                 .pageSize(DocumentPageSize.A4)
@@ -40,6 +48,12 @@ public static void renderAvailableFontsPreview(Path outputFile) throws Exception
         }
     }
 
+    /**
+     * Renders a preview of every bundled font family and returns the PDF bytes.
+     *
+     * @return the generated preview document as PDF bytes
+     * @throws Exception if the document cannot be built or rendered
+     */
     public static byte[] renderAvailableFontsPreview() throws Exception {
         try (DocumentSession document = GraphCompose.document()
                 .pageSize(DocumentPageSize.A4)
@@ -52,6 +66,14 @@ public static byte[] renderAvailableFontsPreview() throws Exception {
         }
     }
 
+    /**
+     * Renders a preview of the given font families and returns the PDF bytes.
+     *
+     * @param fonts logical font names to include; when {@code null} the full
+     *              bundled catalog is used
+     * @return the generated preview document as PDF bytes
+     * @throws Exception if the document cannot be built or rendered
+     */
     public static byte[] renderFontsPreview(Collection<FontName> fonts) throws Exception {
         try (DocumentSession document = GraphCompose.document()
                 .pageSize(DocumentPageSize.A4)
@@ -64,6 +86,13 @@ public static byte[] renderFontsPreview(Collection<FontName> fonts) throws Excep
         }
     }
 
+    /**
+     * Builds the font-preview content into an existing document session.
+     *
+     * @param document open document session to populate; must not be {@code null}
+     * @param fonts    logical font names to showcase; when {@code null} the full
+     *                 bundled catalog is used
+     */
     public static void buildShowcase(DocumentSession document, Collection<FontName> fonts) {
         Objects.requireNonNull(document, "document").pageFlow(flow -> {
             flow.name("AvailableFontsPreview")
diff --git a/src/main/java/com/demcha/compose/font/DefaultFonts.java b/src/main/java/com/demcha/compose/font/DefaultFonts.java
index 9a8dda790..66223c07f 100644
--- a/src/main/java/com/demcha/compose/font/DefaultFonts.java
+++ b/src/main/java/com/demcha/compose/font/DefaultFonts.java
@@ -1,10 +1,8 @@
 package com.demcha.compose.font;
 
 import com.demcha.compose.document.backend.fixed.pdf.PdfFontLibraryFactory;
-import org.apache.pdfbox.pdmodel.PDDocument;
 
 import java.util.ArrayList;
-import java.util.Collection;
 import java.util.List;
 
 /**
@@ -76,27 +74,6 @@ public static FontLibrary standardLibrary() {
         return PdfFontLibraryFactory.standardLibrary();
     }
 
-    /**
-     * Creates a PDF-backed font library containing bundled families.
-     *
-     * @param document PDF document that owns loaded fonts
-     * @return font library
-     */
-    public static FontLibrary library(PDDocument document) {
-        return PdfFontLibraryFactory.library(document);
-    }
-
-    /**
-     * Creates a PDF-backed font library containing bundled and custom families.
-     *
-     * @param document PDF document that owns loaded fonts
-     * @param customFamilies document-local custom font families
-     * @return font library
-     */
-    public static FontLibrary library(PDDocument document, Collection<FontFamilyDefinition> customFamilies) {
-        return PdfFontLibraryFactory.library(document, customFamilies);
-    }
-
     /**
      * Returns bundled font family definitions.
      *
diff --git a/src/test/java/com/demcha/compose/document/api/DocumentSessionTest.java b/src/test/java/com/demcha/compose/document/api/DocumentSessionTest.java
index cbfe6894f..f273924a7 100644
--- a/src/test/java/com/demcha/compose/document/api/DocumentSessionTest.java
+++ b/src/test/java/com/demcha/compose/document/api/DocumentSessionTest.java
@@ -4,7 +4,7 @@
 import com.demcha.compose.document.backend.fixed.pdf.options.PdfHeaderFooterOptions;
 import com.demcha.compose.document.backend.fixed.pdf.options.PdfMetadataOptions;
 import com.demcha.compose.document.backend.fixed.pdf.options.PdfWatermarkOptions;
-import com.demcha.compose.font.DefaultFonts;
+import com.demcha.compose.document.backend.fixed.pdf.PdfFontLibraryFactory;
 import com.demcha.compose.font.FontLibrary;
 import com.demcha.compose.engine.components.content.table.TableCellContent;
 import com.demcha.compose.engine.components.content.table.TableCellLayoutStyle;
@@ -1097,7 +1097,7 @@ private CountingPrepareContext(NodeRegistry registry, PDRectangle pageSize, Marg
             this.registry = registry;
             this.canvas = LayoutCanvas.from(pageSize.getWidth(), pageSize.getHeight(), margin);
             this.measurementDocument = new PDDocument();
-            this.fonts = DefaultFonts.library(measurementDocument);
+            this.fonts = PdfFontLibraryFactory.library(measurementDocument);
             this.textMeasurement = new CountingTextMeasurementSystem(
                     new FontLibraryTextMeasurementSystem(fonts, PdfFont.class));
         }
diff --git a/src/test/java/com/demcha/compose/font/FontShowcaseLayoutSnapshotTest.java b/src/test/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcaseLayoutSnapshotTest.java
similarity index 93%
rename from src/test/java/com/demcha/compose/font/FontShowcaseLayoutSnapshotTest.java
rename to src/test/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcaseLayoutSnapshotTest.java
index 502559821..6cfafc037 100644
--- a/src/test/java/com/demcha/compose/font/FontShowcaseLayoutSnapshotTest.java
+++ b/src/test/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcaseLayoutSnapshotTest.java
@@ -1,4 +1,4 @@
-package com.demcha.compose.font;
+package com.demcha.compose.document.backend.fixed.pdf;
 
 import com.demcha.compose.GraphCompose;
 import com.demcha.compose.document.api.DocumentPageSize;
diff --git a/src/test/java/com/demcha/compose/font/FontShowcaseRenderTest.java b/src/test/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcaseRenderTest.java
similarity index 91%
rename from src/test/java/com/demcha/compose/font/FontShowcaseRenderTest.java
rename to src/test/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcaseRenderTest.java
index eb273220e..2316fa154 100644
--- a/src/test/java/com/demcha/compose/font/FontShowcaseRenderTest.java
+++ b/src/test/java/com/demcha/compose/document/backend/fixed/pdf/FontShowcaseRenderTest.java
@@ -1,6 +1,7 @@
-package com.demcha.compose.font;
+package com.demcha.compose.document.backend.fixed.pdf;
 
 import com.demcha.compose.GraphCompose;
+import com.demcha.compose.font.FontName;
 import com.demcha.testing.VisualTestOutputs;
 import org.apache.pdfbox.Loader;
 import org.apache.pdfbox.pdmodel.PDDocument;
diff --git a/src/test/java/com/demcha/compose/engine/integration/BlockTextIntegrationTest.java b/src/test/java/com/demcha/compose/engine/integration/BlockTextIntegrationTest.java
index 1eee72876..ce3a7e9fe 100644
--- a/src/test/java/com/demcha/compose/engine/integration/BlockTextIntegrationTest.java
+++ b/src/test/java/com/demcha/compose/engine/integration/BlockTextIntegrationTest.java
@@ -1,7 +1,7 @@
 package com.demcha.compose.engine.integration;
 
 import com.demcha.compose.GraphCompose;
-import com.demcha.compose.font.DefaultFonts;
+import com.demcha.compose.document.backend.fixed.pdf.PdfFontLibraryFactory;
 import com.demcha.compose.testsupport.engine.assembly.ComponentBuilder;
 import com.demcha.compose.engine.components.content.text.TextIndentStrategy;
 import com.demcha.compose.engine.components.content.text.BlockTextData;
@@ -167,7 +167,7 @@ void shouldIncreaseVerticalGapAroundMarkdownHeading() throws Exception {
 
         double baseStep;
         try (PDDocument fontDocument = new PDDocument()) {
-            PdfFont font = (PdfFont) DefaultFonts.library(fontDocument)
+            PdfFont font = (PdfFont) PdfFontLibraryFactory.library(fontDocument)
                     .getFont(style.fontName(), PdfFont.class)
                     .orElseThrow();
             baseStep = font.getLineHeight(style) + 2.0;
@@ -206,7 +206,7 @@ void shouldRespectOwnPaddingWhenPositioningBlockTextLines() throws Exception {
 
         double baselineOffsetFromBottom;
         try (PDDocument fontDocument = new PDDocument()) {
-            PdfFont font = (PdfFont) DefaultFonts.library(fontDocument)
+            PdfFont font = (PdfFont) PdfFontLibraryFactory.library(fontDocument)
                     .getFont(style.fontName(), PdfFont.class)
                     .orElseThrow();
             baselineOffsetFromBottom = font.verticalMetrics(style).baselineOffsetFromBottom();
diff --git a/src/test/java/com/demcha/compose/engine/integration/SingleLineTextIntegrationTest.java b/src/test/java/com/demcha/compose/engine/integration/SingleLineTextIntegrationTest.java
index b5aee5dd0..eae373195 100644
--- a/src/test/java/com/demcha/compose/engine/integration/SingleLineTextIntegrationTest.java
+++ b/src/test/java/com/demcha/compose/engine/integration/SingleLineTextIntegrationTest.java
@@ -1,7 +1,7 @@
 package com.demcha.compose.engine.integration;
 
 import com.demcha.compose.GraphCompose;
-import com.demcha.compose.font.DefaultFonts;
+import com.demcha.compose.document.backend.fixed.pdf.PdfFontLibraryFactory;
 import com.demcha.compose.engine.components.content.text.TextStyle;
 import com.demcha.compose.engine.components.core.Entity;
 import com.demcha.compose.engine.components.layout.Anchor;
@@ -48,7 +48,7 @@ void shouldRenderAutosizedSingleLineTextAtPaddingAdjustedBaseline() throws Excep
             Placement placement = textEntity.getComponent(Placement.class).orElseThrow();
             PdfFont.VerticalMetrics metrics;
             try (PDDocument fontDocument = new PDDocument()) {
-                PdfFont pdfFont = (PdfFont) DefaultFonts.library(fontDocument)
+                PdfFont pdfFont = (PdfFont) PdfFontLibraryFactory.library(fontDocument)
                         .getFont(style.fontName(), PdfFont.class)
                         .orElseThrow();
                 metrics = pdfFont.verticalMetrics(style);
diff --git a/src/test/java/com/demcha/compose/font/FontLibraryIntegrationTest.java b/src/test/java/com/demcha/compose/font/FontLibraryIntegrationTest.java
index 6e6d4b759..e81b4664a 100644
--- a/src/test/java/com/demcha/compose/font/FontLibraryIntegrationTest.java
+++ b/src/test/java/com/demcha/compose/font/FontLibraryIntegrationTest.java
@@ -1,6 +1,7 @@
 package com.demcha.compose.font;
 
 import com.demcha.compose.GraphCompose;
+import com.demcha.compose.document.backend.fixed.pdf.PdfFontLibraryFactory;
 import com.demcha.compose.testsupport.EngineComposerHarness;
 import com.demcha.compose.engine.render.pdf.PdfFont;
 import com.demcha.compose.engine.render.word.WordFont;
@@ -24,7 +25,7 @@ void shouldExposeBundledGoogleFontsInEngineComposerHarness() throws Exception {
         }
 
         try (PDDocument document = new PDDocument()) {
-            FontLibrary fonts = DefaultFonts.library(document);
+            FontLibrary fonts = PdfFontLibraryFactory.library(document);
             assertThat(fonts.getFont(FontName.LATO, PdfFont.class)).isPresent();
             assertThat(fonts.getFont(FontName.LATO, WordFont.class)).isPresent();
             assertThat(fonts.getFont(FontName.KANIT, PdfFont.class)).isPresent();
@@ -61,7 +62,7 @@ void shouldRegisterCustomFontFamilyFromFilePaths() throws Exception {
                 .build();
 
         try (PDDocument document = new PDDocument()) {
-            FontLibrary fonts = DefaultFonts.library(document, List.of(customDefinition));
+            FontLibrary fonts = PdfFontLibraryFactory.library(document, List.of(customDefinition));
             assertThat(fonts.getFont(customFamily, PdfFont.class)).isPresent();
             assertThat(fonts.getFont(customFamily, WordFont.class)).isPresent();
         }
diff --git a/src/test/java/com/demcha/compose/testsupport/EngineComposerHarness.java b/src/test/java/com/demcha/compose/testsupport/EngineComposerHarness.java
index 1d69ccd4e..03acf456a 100644
--- a/src/test/java/com/demcha/compose/testsupport/EngineComposerHarness.java
+++ b/src/test/java/com/demcha/compose/testsupport/EngineComposerHarness.java
@@ -1,6 +1,6 @@
 package com.demcha.compose.testsupport;
 
-import com.demcha.compose.font.DefaultFonts;
+import com.demcha.compose.document.backend.fixed.pdf.PdfFontLibraryFactory;
 import com.demcha.compose.font.FontFamilyDefinition;
 import com.demcha.compose.font.FontName;
 import com.demcha.compose.testsupport.engine.assembly.ComponentBuilder;
@@ -72,7 +72,7 @@ private EngineComposerHarness(Path outputFile,
                                   Margin margin,
                                   Collection<FontFamilyDefinition> customFontFamilies) {
         this.doc = new PDDocument();
-        this.entityManager = new EntityManager(DefaultFonts.library(doc, customFontFamilies), markdown);
+        this.entityManager = new EntityManager(PdfFontLibraryFactory.library(doc, customFontFamilies), markdown);
         this.entityManager.setGuideLines(guideLines);
         this.componentBuilder = createComponentBuilder(entityManager);
         this.canvas = new PdfCanvas(pageSize, 0.0f, 0.0f);
diff --git a/src/test/java/com/demcha/documentation/PdfBackendIsolationGuardTest.java b/src/test/java/com/demcha/documentation/PdfBackendIsolationGuardTest.java
index d69f60ed7..8e4989ab9 100644
--- a/src/test/java/com/demcha/documentation/PdfBackendIsolationGuardTest.java
+++ b/src/test/java/com/demcha/documentation/PdfBackendIsolationGuardTest.java
@@ -16,9 +16,12 @@
 
 /**
  * Architectural guard that keeps PDFBox out of the canonical document API, the
- * layered template surface, and non-PDF fixed-layout contracts. Templates
- * compose against the canonical DSL and must stay backend-neutral, so a preset
- * or component that reached for a PDFBox type would fail here.
+ * layered template surface, non-PDF fixed-layout contracts, and the public font
+ * catalog. Templates compose against the canonical DSL and must stay
+ * backend-neutral, so a preset or component that reached for a PDFBox type would
+ * fail here. The {@code compose.font} package is the logical font catalog — it
+ * names fonts, it never loads them (PDFBox loading belongs to the pdf backend
+ * factory), so it is guarded too.
  */
 class PdfBackendIsolationGuardTest {
 
@@ -37,7 +40,12 @@ class PdfBackendIsolationGuardTest {
             PROJECT_ROOT.resolve("src/main/java/com/demcha/compose/document/layout"),
             PROJECT_ROOT.resolve("src/main/java/com/demcha/compose/document/snapshot"),
             PROJECT_ROOT.resolve("src/main/java/com/demcha/compose/document/templates"),
-            PROJECT_ROOT.resolve("src/main/java/com/demcha/compose/document/backend/fixed"));
+            PROJECT_ROOT.resolve("src/main/java/com/demcha/compose/document/backend/fixed"),
+            // The public font catalog names logical fonts; it never loads them.
+            // PDFBox loading lives in the pdf backend factory, so compose.font
+            // must stay PDFBox-free (FontShowcase, which renders a preview PDF,
+            // lives under backend/fixed/pdf and is exempted like the rest of it).
+            PROJECT_ROOT.resolve("src/main/java/com/demcha/compose/font"));
 
     @Test
     void pdfboxShouldStayOutOfCanonicalAndNonPdfBackendContracts() throws IOException {