diff --git a/GiteaPR.xcodeproj/project.pbxproj b/GiteaPR.xcodeproj/project.pbxproj
index 7851c56..a56c2bf 100644
--- a/GiteaPR.xcodeproj/project.pbxproj
+++ b/GiteaPR.xcodeproj/project.pbxproj
@@ -187,7 +187,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 4;
+				CURRENT_PROJECT_VERSION = 5;
 				DEVELOPMENT_TEAM = "";
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_KEY_CFBundleDisplayName = "GiteaPR";
@@ -197,7 +197,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.3;
+				MARKETING_VERSION = 1.4;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bueso.giteapr;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = YES;
@@ -211,7 +211,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 4;
+				CURRENT_PROJECT_VERSION = 5;
 				DEVELOPMENT_TEAM = "";
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_KEY_CFBundleDisplayName = "GiteaPR";
@@ -221,7 +221,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.3;
+				MARKETING_VERSION = 1.4;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bueso.giteapr;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = YES;
diff --git a/GiteaPR/Detail/DiffView.swift b/GiteaPR/Detail/DiffView.swift
index 2451ede..27977cc 100644
--- a/GiteaPR/Detail/DiffView.swift
+++ b/GiteaPR/Detail/DiffView.swift
@@ -2,32 +2,79 @@ import SwiftUI
 
 /// Read-only unified diff viewer for a single changed file.
 ///
-/// Parses a Gitea unified diff patch into line hunks so added/deleted lines can
-/// be colour-coded. Gitea only returns `patch` for small diffs; large files
-/// fall back to a raw text view.
+/// This Gitea instance does NOT return a per-file `patch` from
+/// `/pulls/{n}/files` (the field is absent), so the diff is fetched from the
+/// PR's `.diff` endpoint and the hunks belonging to this file are extracted.
+/// Added/deleted lines are colour-coded.
 struct DiffView: View {
+    let repo: Repository
+    let prNumber: Int
     let file: ChangedFile
+    @State private var lines: [DiffLine] = []
+    @State private var isLoading = true
+    @State private var errorMessage: String?
 
     var body: some View {
         Group {
-            if let patch = file.patch, !patch.isEmpty {
+            if isLoading {
+                ProgressView("Loading diff…")
+            } else if let errorMessage {
+                ContentUnavailableView(
+                    "Couldn't load diff",
+                    systemImage: "doc.text",
+                    description: Text(errorMessage))
+            } else {
                 ScrollView([.horizontal, .vertical]) {
                     LazyVStack(alignment: .leading, spacing: 0) {
-                        ForEach(parse(patch)) { line in
+                        ForEach(lines) { line in
                             diffLine(line)
                         }
                     }
                     .font(.caption.monospaced())
                 }
-            } else {
-                ContentUnavailableView(
-                    "Diff too large to preview",
-                    systemImage: "doc.text",
-                    description: Text("Gitea didn't return a patch for this file."))
             }
         }
         .navigationTitle(file.filename)
         .navigationBarTitleDisplayMode(.inline)
+        .task { await load() }
+    }
+
+    private func load() async {
+        isLoading = true
+        errorMessage = nil
+        defer { isLoading = false }
+        guard let client = SettingsStore.shared.client() else {
+            errorMessage = "Not configured."
+            return
+        }
+        do {
+            let full = try await client.diff(owner: repo.owner.login,
+                                             repo: repo.name,
+                                             number: prNumber)
+            let patch = extractSection(named: file.filename, from: full)
+            lines = parse(patch.isEmpty ? full : patch)
+            if lines.isEmpty {
+                errorMessage = "No diff content for this file."
+            }
+        } catch {
+            errorMessage = error.localizedDescription
+        }
+    }
+
+    /// Extract the unified-diff block for `filename` from a multi-file diff.
+    /// Falls back to the whole diff if the header can't be matched.
+    private func extractSection(named filename: String, from diff: String) -> String {
+        let marker = "+++ b/\(filename)"
+        guard let idx = diff.range(of: marker)?.upperBound else {
+            return ""
+        }
+        let tail = String(diff[idx...])
+        // Find the next "diff --git " after this file's header to delimit it.
+        let rest = tail.dropFirst(marker.count)
+        if let next = rest.range(of: "\ndiff --git ") {
+            return String(tail[..<next.lowerBound])
+        }
+        return tail
     }
 
     private func diffLine(_ line: DiffLine) -> some View {
diff --git a/GiteaPR/Detail/Tabs.swift b/GiteaPR/Detail/Tabs.swift
index 3954b63..1797324 100644
--- a/GiteaPR/Detail/Tabs.swift
+++ b/GiteaPR/Detail/Tabs.swift
@@ -106,7 +106,7 @@ struct FilesTab: View {
                 }
             }
             .navigationDestination(for: ChangedFile.self) { file in
-                DiffView(file: file)
+                DiffView(repo: vm.repo, prNumber: vm.prNumber, file: file)
             }
         }
     }
diff --git a/GiteaPR/Networking/GiteaClient.swift b/GiteaPR/Networking/GiteaClient.swift
index 1fff7bc..dc76ce3 100644
--- a/GiteaPR/Networking/GiteaClient.swift
+++ b/GiteaPR/Networking/GiteaClient.swift
@@ -118,6 +118,18 @@ struct GiteaClient {
         _ = try await request(path, method: "POST")
     }
 
+    /// Raw unified diff for a PR as plain text (from the `.diff` endpoint).
+    /// This Gitea instance does NOT return `patch` per file in
+    /// `/pulls/{n}/files` (the field is absent), so the diff must come from
+    /// here. The response is `text/plain`, not JSON.
+    func diff(owner: String, repo: String, number: Int) async throws -> String {
+        let data = try await request("repos/\(owner)/\(repo)/pulls/\(number).diff")
+        guard let text = String(data: data, encoding: .utf8) else {
+            throw APIError.invalidResponse
+        }
+        return text
+    }
+
     // MARK: - User
 
     /// Current authenticated user (for the "Test connection" button and