diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d7948c0..d5f38fbe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,9 +10,15 @@ x.x.x - TODO
 1.5.x - 2024xxxx Maintenance release for 1.x (PHP >= 7.4)
   * ...
 
-2.7.x - 2024xxxx
+2.8.x - 2024xxxx
   * ...
 
+2.8.0 - 20240901 Support 'kepubify' tool for Kobo
+  * Add FileRenderer class to send files + use sendHeaders
+  * Fix Zipper to allow unicode chars in file names
+  * Refactor FetchHandler and getUpdatedEpub to support kepubify
+  * Use optional kepubify tool to convert EPUB files for Kobo - see #77 by @SenorSmartyPants
+
 2.7.5 - 20240831 Show extra data files in book detail + start GraphQL
   * Changes in config_default.php file:
     - new $config['cops_kepubify_path']
diff --git a/lib/Calibre/Book.php b/lib/Calibre/Book.php
index 6cb6af81..96b7b0d4 100644
--- a/lib/Calibre/Book.php
+++ b/lib/Calibre/Book.php
@@ -13,6 +13,7 @@
 use SebLucas\Cops\Model\EntryBook;
 use SebLucas\Cops\Model\LinkEntry;
 use SebLucas\Cops\Model\LinkFeed;
+use SebLucas\Cops\Output\FileRenderer;
 use SebLucas\Cops\Output\Format;
 use SebLucas\Cops\Pages\PageId;
 use SebLucas\EPubMeta\EPub;
@@ -567,18 +568,16 @@ public function getCoverFilePath($extension)
     /**
      * Summary of getUpdatedEpub
      * @param int $idData
-     * @param bool $sendHeaders
      * @return void
      */
-    public function getUpdatedEpub($idData, $sendHeaders = true)
+    public function getUpdatedEpub($idData)
     {
         $data = $this->getDataById($idData);
 
         // if we want to update metadata and then use kepubify, we need to save the updated Epub first
         if ($this->updateForKepub && !empty(Config::get('kepubify_path'))) {
             // make a temp copy for the updated Epub file
-            $tmpdir = sys_get_temp_dir();
-            $tmpfile = tempnam($tmpdir, 'COPS') . '.epub';
+            $tmpfile = FileRenderer::getTempFile('epub');
             if (!copy($data->getLocalPath(), $tmpfile)) {
                 echo 'Error: unable to copy epub file';
                 return;
@@ -626,6 +625,7 @@ public function getUpdatedEpub($idData, $sendHeaders = true)
                 }
                 $epub->updateForKepub();
             }
+            $sendHeaders = headers_sent() ? false : true;
             $epub->download($filename, $sendHeaders);
         } catch (Exception $e) {
             echo 'Exception : ' . $e->getMessage();
@@ -635,26 +635,28 @@ public function getUpdatedEpub($idData, $sendHeaders = true)
     /**
      * Summary of runKepubify
      * @param string $filepath
-     * @param ?string $sendfile
+     * @param ?string $sendFile
      * @return string|null
      */
-    public function runKepubify($filepath, $sendfile = null)
+    public function runKepubify($filepath, $sendFile = null)
     {
         if (empty(Config::get('kepubify_path'))) {
             return null;
         }
-        $tmpdir = sys_get_temp_dir();
-        $tmpfile = tempnam($tmpdir, 'COPS') . '.kepub.epub';
+        $tmpfile = FileRenderer::getTempFile('kepub.epub');
         $cmd = escapeshellarg(Config::get('kepubify_path'));
         $cmd .= ' -o ' . escapeshellarg($tmpfile);
         $cmd .= ' ' . escapeshellarg($filepath);
         exec($cmd, $output, $return);
         if ($return == 0 && file_exists($tmpfile)) {
-            if (!empty($sendfile)) {
-                header('Content-Type: ' . EPub::MIME_TYPE);
-                header('Content-Disposition: attachment; filename="' . basename($sendfile) . '"');
+            if (!empty($sendFile)) {
                 // don't use x_accel_redirect since we deal with a tmpfile here
-                header('Content-Length: ' . filesize($tmpfile));
+                $sendHeaders = headers_sent() ? false : true;
+                if ($sendHeaders) {
+                    header('Content-Type: ' . EPub::MIME_TYPE);
+                    header('Content-Disposition: attachment; filename="' . basename($sendFile) . '"');
+                    header('Content-Length: ' . filesize($tmpfile));
+                }
                 readfile($tmpfile);
             }
             return $tmpfile;
diff --git a/lib/Calibre/Cover.php b/lib/Calibre/Cover.php
index 26adef80..bdba0ebe 100644
--- a/lib/Calibre/Cover.php
+++ b/lib/Calibre/Cover.php
@@ -207,10 +207,9 @@ public function getThumbnail($width, $height, $outputfile = null, $inType = 'jpg
     /**
      * Summary of sendThumbnail
      * @param Request $request
-     * @param bool $sendHeaders
      * @return void
      */
-    public function sendThumbnail($request, $sendHeaders = true)
+    public function sendThumbnail($request)
     {
         $type = $request->get('type', 'jpg');
         $width = $request->get('width');
@@ -239,6 +238,7 @@ public function sendThumbnail($request, $sendHeaders = true)
         $mime = ($type == 'jpg') ? 'image/jpeg' : 'image/png';
         $file = $this->coverFileName;
 
+        $sendHeaders = headers_sent() ? false : true;
         if ($sendHeaders) {
             $expires = 60 * 60 * 24 * 14;
             header('Pragma: public');
diff --git a/lib/Handlers/EpubFsHandler.php b/lib/Handlers/EpubFsHandler.php
index 3084bdbd..d8250d21 100644
--- a/lib/Handlers/EpubFsHandler.php
+++ b/lib/Handlers/EpubFsHandler.php
@@ -49,10 +49,13 @@ public function handle($request)
         try {
             $data = EPubReader::getContent($idData, $component, $request);
 
-            $expires = 60 * 60 * 24 * 14;
-            header('Pragma: public');
-            header('Cache-Control: maxage=' . $expires);
-            header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
+            $sendHeaders = headers_sent() ? false : true;
+            if ($sendHeaders) {
+                $expires = 60 * 60 * 24 * 14;
+                header('Pragma: public');
+                header('Cache-Control: maxage=' . $expires);
+                header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
+            }
 
             echo $data;
         } catch (Exception $e) {
diff --git a/lib/Handlers/FetchHandler.php b/lib/Handlers/FetchHandler.php
index 2b9f0496..3698b2d0 100644
--- a/lib/Handlers/FetchHandler.php
+++ b/lib/Handlers/FetchHandler.php
@@ -83,11 +83,6 @@ public function handle($request)
         }
 
         if (!empty($file)) {
-            if ($file == 'zipped') {
-                // zip all extra files and send back
-                $this->zipExtraFiles($request, $book);
-                return;
-            }
             $this->sendExtraFile($request, $book, $file);
             return;
         }
@@ -113,40 +108,13 @@ public function handle($request)
         }
 
         if ($type == 'epub' && Config::get('provide_kepub') == '1'  && preg_match('/Kobo/', $request->agent())) {
-            // run kepubify on original Epub file and send converted tmpfile
-            if (!empty(Config::get('kepubify_path'))) {
-                $kepubFile = $book->runKepubify($file, $data->getUpdatedFilenameKepub());
-                if (empty($kepubFile)) {
-                    echo 'Error: failed to convert epub file';
-                }
-                return;
-            }
-            // provide kepub in name only (without update of opf properties for cover-image in Epub)
-            FileRenderer::sendFile($file, basename($data->getUpdatedFilenameKepub()), $data->getMimeType());
+            $this->sendConvertedKepub($book, $file, $data);
+            return;
         }
 
         FileRenderer::sendFile($file, basename($file), $data->getMimeType());
     }
 
-    /**
-     * Summary of zipExtraFiles
-     * @param Request $request
-     * @param Book $book
-     * @return void
-     */
-    public function zipExtraFiles($request, $book)
-    {
-        $zipper = new Zipper($request);
-
-        if ($zipper->isValidForExtraFiles($book)) {
-            // disable nginx buffering by default
-            header('X-Accel-Buffering: no');
-            $zipper->download();
-        } else {
-            echo "Invalid zipped: " . $zipper->getMessage();
-        }
-    }
-
     /**
      * Summary of sendExtraFile
      * @param Request $request
@@ -156,6 +124,11 @@ public function zipExtraFiles($request, $book)
      */
     public function sendExtraFile($request, $book, $file)
     {
+        if ($file == 'zipped') {
+            // zip all extra files and send back
+            $this->zipExtraFiles($request, $book);
+            return;
+        }
         $extraFiles = $book->getExtraFiles();
         if (!in_array($file, $extraFiles)) {
             // this will call exit()
@@ -170,6 +143,28 @@ public function sendExtraFile($request, $book, $file)
         FileRenderer::sendFile($filepath, basename($filepath));
     }
 
+    /**
+     * Summary of zipExtraFiles
+     * @param Request $request
+     * @param Book $book
+     * @return void
+     */
+    public function zipExtraFiles($request, $book)
+    {
+        $zipper = new Zipper($request);
+
+        if ($zipper->isValidForExtraFiles($book)) {
+            $sendHeaders = headers_sent() ? false : true;
+            // disable nginx buffering by default
+            if ($sendHeaders) {
+                header('X-Accel-Buffering: no');
+            }
+            $zipper->download(null, $sendHeaders);
+        } else {
+            echo "Invalid zipped: " . $zipper->getMessage();
+        }
+    }
+
     /**
      * Summary of sendThumbnail
      * @param Request $request
@@ -204,4 +199,25 @@ public function sendUpdatedEpub($request, $book, $idData)
         // this will also use kepubify_path internally if defined
         $book->getUpdatedEpub($idData);
     }
+
+    /**
+     * Summary of sendConvertedKepub
+     * @param Book $book
+     * @param string $file
+     * @param Data $data
+     * @return void
+     */
+    public function sendConvertedKepub($book, $file, $data)
+    {
+        // run kepubify on original Epub file and send converted tmpfile
+        if (!empty(Config::get('kepubify_path'))) {
+            $kepubFile = $book->runKepubify($file, $data->getUpdatedFilenameKepub());
+            if (empty($kepubFile)) {
+                echo 'Error: failed to convert epub file';
+            }
+            return;
+        }
+        // provide kepub in name only (without update of opf properties for cover-image in Epub)
+        FileRenderer::sendFile($file, basename($data->getUpdatedFilenameKepub()), $data->getMimeType());
+    }
 }
diff --git a/lib/Handlers/ZipFsHandler.php b/lib/Handlers/ZipFsHandler.php
index cda2fe3e..8d168331 100644
--- a/lib/Handlers/ZipFsHandler.php
+++ b/lib/Handlers/ZipFsHandler.php
@@ -57,10 +57,14 @@ public function handle($request)
             if ($res === false) {
                 throw new Exception('Unknown component ' . $component);
             }
-            $expires = 60 * 60 * 24 * 14;
-            header('Pragma: public');
-            header('Cache-Control: maxage=' . $expires);
-            header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
+
+            $sendHeaders = headers_sent() ? false : true;
+            if ($sendHeaders) {
+                $expires = 60 * 60 * 24 * 14;
+                header('Pragma: public');
+                header('Cache-Control: maxage=' . $expires);
+                header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
+            }
 
             echo $zip->getFromName($component);
             $zip->close();
diff --git a/lib/Handlers/ZipperHandler.php b/lib/Handlers/ZipperHandler.php
index 457d3721..46e06cf9 100644
--- a/lib/Handlers/ZipperHandler.php
+++ b/lib/Handlers/ZipperHandler.php
@@ -50,9 +50,12 @@ public function handle($request)
         $zipper = new Zipper($request);
 
         if ($zipper->isValidForDownload()) {
+            $sendHeaders = headers_sent() ? false : true;
             // disable nginx buffering by default
-            header('X-Accel-Buffering: no');
-            $zipper->download();
+            if ($sendHeaders) {
+                header('X-Accel-Buffering: no');
+            }
+            $zipper->download(null, $sendHeaders);
         } else {
             echo "Invalid download: " . $zipper->getMessage();
         }
diff --git a/lib/Input/Config.php b/lib/Input/Config.php
index 3f3b2ad6..9f13ccc6 100644
--- a/lib/Input/Config.php
+++ b/lib/Input/Config.php
@@ -16,7 +16,7 @@
  */
 class Config
 {
-    public const VERSION = '2.7.5';
+    public const VERSION = '2.8.0';
     public const ENDPOINT = [
         "index" => "index.php",
         "feed" => "feed.php",
diff --git a/lib/Output/FileRenderer.php b/lib/Output/FileRenderer.php
index 1c84a9e2..01817141 100644
--- a/lib/Output/FileRenderer.php
+++ b/lib/Output/FileRenderer.php
@@ -33,6 +33,22 @@ public static function getMimeType($filepath)
         return $mimetype;
     }
 
+    /**
+     * Summary of getTempFile
+     * @param string $extension
+     * @return string
+     */
+    public static function getTempFile($extension = '')
+    {
+        $tmpdir = sys_get_temp_dir();
+        $tmpfile = tempnam($tmpdir, 'COPS');
+        if (empty($extension)) {
+            return $tmpfile;
+        }
+        rename($tmpfile, $tmpfile . '.' . $extension);
+        return $tmpfile . '.' . $extension;
+    }
+
     /**
      * Summary of sendFile
      * @param string $filepath actual filepath
diff --git a/test/BookTest.php b/test/BookTest.php
index 1d994cda..594399a7 100644
--- a/test/BookTest.php
+++ b/test/BookTest.php
@@ -374,7 +374,7 @@ public function testSendThumbnailOriginal(): void
 
         // no thumbnail resizing
         ob_start();
-        $cover->sendThumbnail($request, false);
+        $cover->sendThumbnail($request);
         $headers = headers_list();
         $output = ob_get_clean();
 
@@ -392,7 +392,7 @@ public function testSendThumbnailResize(): void
 
         // no thumbnail cache
         ob_start();
-        $cover->sendThumbnail($request, false);
+        $cover->sendThumbnail($request);
         $headers = headers_list();
         $output = ob_get_clean();
 
@@ -422,7 +422,7 @@ public function testSendThumbnailCacheMiss(): void
 
         // 1. cache miss
         ob_start();
-        $cover->sendThumbnail($request, false);
+        $cover->sendThumbnail($request);
         $headers = headers_list();
         $output = ob_get_clean();
 
@@ -448,7 +448,7 @@ public function testSendThumbnailCacheHit(): void
 
         // 2. cache hit
         ob_start();
-        $cover->sendThumbnail($request, false);
+        $cover->sendThumbnail($request);
         $headers = headers_list();
         $output = ob_get_clean();
 
@@ -576,7 +576,7 @@ public function testGetUpdatedEpub(): void
         $book = Book::getBookById(17);
 
         ob_start();
-        $book->getUpdatedEpub(20, false);
+        $book->getUpdatedEpub(20);
         $headers = headers_list();
         $output = ob_get_clean();
 
diff --git a/test/EpubFsTest.php b/test/EpubFsTest.php
index 88d98b24..d41888b9 100644
--- a/test/EpubFsTest.php
+++ b/test/EpubFsTest.php
@@ -132,11 +132,6 @@ public function testEncodeDecode(): void
         $this->assertEquals($decoded, EPubReader::decode($encoded));
     }
 
-    /**
-     * Summary of testEpubFsHandler
-     * @runInSeparateProcess
-     * @return void
-     */
     public function testEpubFsHandler(): void
     {
         // set request handler to 'phpunit' to override cli check in handler
@@ -152,11 +147,6 @@ public function testEpubFsHandler(): void
         $this->assertStringContainsString($expected, $output);
     }
 
-    /**
-     * Summary of testZipFsHandler
-     * @runInSeparateProcess
-     * @return void
-     */
     public function testZipFsHandler(): void
     {
         // set request handler to 'phpunit' to override cli check in handler
diff --git a/test/ZipperTest.php b/test/ZipperTest.php
index f6088f31..007e3791 100644
--- a/test/ZipperTest.php
+++ b/test/ZipperTest.php
@@ -17,13 +17,14 @@
 use SebLucas\Cops\Framework;
 use SebLucas\Cops\Input\Config;
 use SebLucas\Cops\Input\Request;
+use SebLucas\Cops\Output\FileRenderer;
 use SebLucas\Cops\Pages\PageId;
 
 class ZipperTest extends TestCase
 {
     /** @var array<string, int> */
     protected static $expectedSize = [
-        'recent' => 1596525,
+        'recent' => 1596561,
         'author' => 1594886,
         'zipped' => 344,
     ];
@@ -37,11 +38,6 @@ public static function setUpBeforeClass(): void
         Database::clearDb();
     }
 
-    /**
-     * Summary of testDownloadPageRecent
-     * @runInSeparateProcess
-     * @return void
-     */
     public function testDownloadPageRecent(): void
     {
         $page = PageId::ALL_RECENT_BOOKS;
@@ -57,7 +53,7 @@ public function testDownloadPageRecent(): void
         $this->assertTrue($valid);
 
         ob_start();
-        $zipper->download();
+        $zipper->download(null, false);
         $headers = headers_list();
         $output = ob_get_clean();
 
@@ -68,11 +64,6 @@ public function testDownloadPageRecent(): void
         Config::set('download_page', ['']);
     }
 
-    /**
-     * Summary of testDownloadAuthor
-     * @runInSeparateProcess
-     * @return void
-     */
     public function testDownloadAuthor(): void
     {
         $authorId = 3;
@@ -88,10 +79,9 @@ public function testDownloadAuthor(): void
         $this->assertTrue($valid);
 
         ob_start();
-        $zipper->download();
+        $zipper->download(null, false);
         $headers = headers_list();
         $output = ob_get_clean();
-        $headers = headers_list();
 
         $expected = self::$expectedSize['author'];
         $this->assertEquals(0, count($headers));
@@ -138,11 +128,6 @@ public function testDownloadWrongFormat(): void
         Config::set('download_page', ['']);
     }
 
-    /**
-     * Summary of testZipExtraFiles
-     * @runInSeparateProcess
-     * @return void
-     */
     public function testZipExtraFiles(): void
     {
         $request = new Request();
@@ -153,20 +138,32 @@ public function testZipExtraFiles(): void
         $this->assertTrue($valid);
 
         ob_start();
-        $zipper->download();
+        $zipper->download(null, false);
         $headers = headers_list();
         $output = ob_get_clean();
 
         $expected = self::$expectedSize['zipped'];
         $this->assertEquals(0, count($headers));
         $this->assertEquals($expected, strlen($output));
+
+        $expected = [
+            'hello.txt',
+            'sub/copied.txt',
+        ];
+        // make a temp file to analyze the zip file
+        $tmpfile = FileRenderer::getTempFile('zip');
+        file_put_contents($tmpfile, $output);
+        $zip = new \ZipArchive();
+        $result = $zip->open($tmpfile, \ZipArchive::RDONLY);
+        $this->assertTrue($result);
+        $result = [];
+        for ($i = 0; $i < $zip->numFiles; $i++) {
+            $result[] = $zip->getNameIndex($i);
+        }
+        $this->assertEquals($expected, $result);
+        $zip->close();
     }
 
-    /**
-     * Summary of testZipperHandler
-     * @runInSeparateProcess
-     * @return void
-     */
     public function testZipperHandler(): void
     {
         $page = PageId::ALL_RECENT_BOOKS;