diff --git a/README.md b/README.md
index dd8ec9a..aaccefb 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ Open-source software under the AGPL V3 license.
     - [Translation](#translation)
     - [Contributors](#contributors)
     - [Fundings](#fundings)
+- [Screenshots](#screenshots)
 
 
 ## Installation
@@ -162,4 +163,4 @@ Vincent LAURENT (24ème), Jean-Baptiste Le Metayer (24ème), Xavier Garnier (Log
 - 100 € excl. taxes donations from the company PDG IT
 - 1 040 € excl. taxes from the foundation NLNet pour software internationalization
 
-The development of the software was primarily done during the working hours of 24ème employees.
+The development of the software was primarily done during the working hours of 24ème employees.
\ No newline at end of file
diff --git a/app.php b/app.php
index 4c82f1d..e3f55f2 100644
--- a/app.php
+++ b/app.php
@@ -409,8 +409,12 @@ $f3->route('GET /metadata',
 
 $f3->route('GET /compress',
     function($f3) {
+        $f3->set('error_message', "none");
         $f3->set('maxSize',  min(array(convertPHPSizeToBytes(ini_get('post_max_size')), convertPHPSizeToBytes(ini_get('upload_max_filesize')))));
         $f3->set('activeTab', 'compress');
+        if (isset($_GET['err'])) {
+            $f3->set('error_message', "PDF optimized");
+        }
         echo View::instance()->render('compress.html.php');
     }
 );
@@ -438,17 +442,23 @@ $f3->route ('POST /compress',
 
         $arrayPath = array_keys($files);
         $filePath = reset($arrayPath);
+
         $outputFileName = str_replace(".pdf", "_compressed.pdf", $filePath);
 
         $returnCode = shell_exec(sprintf("gs -sDEVICE=pdfwrite -dPDFSETTINGS=%s -dQUIET -o %s %s", $compressionType, $outputFileName, $filePath));
 
         if ($returnCode !== false) {
+            if (filesize($filePath) <= filesize($outputFileName)) {
+                $error = "pdfalreadyoptimized";
+                header('location: /compress?err=' . $error);
+            } else {
                 header('Content-Type: application/pdf');
                 header("Content-Disposition: attachment; filename=$outputFileName");
                 readfile($outputFileName);
                 unlink($outputFileName);
+            }
         } else {
-                echo "PDF compression failed.";
+            echo "PDF compression failed.";
         }
     }
 );
diff --git a/locale/application.pot b/locale/application.pot
index ffa4913..aa08a1d 100644
--- a/locale/application.pot
+++ b/locale/application.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2023-09-29 11:52+0200\n"
+"POT-Creation-Date: 2023-10-24 17:22+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -46,6 +46,9 @@ msgid ""
 "The PDF will be processed by the server without being retained or stored"
 msgstr ""
 
+msgid "Your pdf is already optimized"
+msgstr ""
+
 msgid "Compress"
 msgstr ""
 
diff --git a/locale/application_7b6a264dde56b2de3396e3739e066007.pot b/locale/application_35294e16757c3d30edc4fc9ce3867679.pot
similarity index 100%
rename from locale/application_7b6a264dde56b2de3396e3739e066007.pot
rename to locale/application_35294e16757c3d30edc4fc9ce3867679.pot
diff --git a/locale/ar/LC_MESSAGES/application.po b/locale/ar/LC_MESSAGES/application.po
index b04f3cf..750c35c 100644
--- a/locale/ar/LC_MESSAGES/application.po
+++ b/locale/ar/LC_MESSAGES/application.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2023-09-29 11:52+0200\n"
+"POT-Creation-Date: 2023-10-24 17:21+0200\n"
 "PO-Revision-Date: 2023-09-29 08:55+0000\n"
 "Last-Translator: ButterflyOfFire <boffire@users.noreply.hosted.weblate.org>\n"
 "Language-Team: Arabic <https://hosted.weblate.org/projects/signature-pdf/"
@@ -49,6 +49,9 @@ msgid ""
 "The PDF will be processed by the server without being retained or stored"
 msgstr "سيتم معالجة ملف PDF على الخادم دون الاحتفاظ به أو تخزينه"
 
+msgid "Your pdf is already optimized"
+msgstr ""
+
 msgid "Compress"
 msgstr "ضغط"
 
diff --git a/locale/ar/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo b/locale/ar/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
similarity index 100%
rename from locale/ar/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo
rename to locale/ar/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
diff --git a/locale/fr/LC_MESSAGES/application.mo b/locale/fr/LC_MESSAGES/application.mo
index e742657..adfc868 100644
Binary files a/locale/fr/LC_MESSAGES/application.mo and b/locale/fr/LC_MESSAGES/application.mo differ
diff --git a/locale/fr/LC_MESSAGES/application.po b/locale/fr/LC_MESSAGES/application.po
index a3fac07..616dd41 100644
--- a/locale/fr/LC_MESSAGES/application.po
+++ b/locale/fr/LC_MESSAGES/application.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2023-09-29 11:06+0200\n"
+"POT-Creation-Date: 2023-10-24 17:21+0200\n"
 "PO-Revision-Date: 2023-09-30 12:59+0000\n"
 "Last-Translator: ButterflyOfFire <boffire@users.noreply.hosted.weblate.org>\n"
 "Language-Team: French <https://hosted.weblate.org/projects/signature-pdf/"
@@ -49,6 +49,9 @@ msgid ""
 "The PDF will be processed by the server without being retained or stored"
 msgstr "Le PDF sera traité par le serveur sans être conservé ni stocké"
 
+msgid "Your pdf is already optimized"
+msgstr "Votre PDF est déja optimisé"
+
 msgid "Compress"
 msgstr "Compresser"
 
diff --git a/locale/fr/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo b/locale/fr/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
similarity index 100%
rename from locale/fr/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo
rename to locale/fr/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
diff --git a/locale/kab/LC_MESSAGES/application.mo b/locale/kab/LC_MESSAGES/application.mo
index 6ee27fd..127de6f 100644
Binary files a/locale/kab/LC_MESSAGES/application.mo and b/locale/kab/LC_MESSAGES/application.mo differ
diff --git a/locale/kab/LC_MESSAGES/application.po b/locale/kab/LC_MESSAGES/application.po
index 92dc9ef..4c21542 100644
--- a/locale/kab/LC_MESSAGES/application.po
+++ b/locale/kab/LC_MESSAGES/application.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2023-09-29 11:28+0200\n"
+"POT-Creation-Date: 2023-10-24 17:21+0200\n"
 "PO-Revision-Date: 2023-09-30 00:00+0000\n"
 "Last-Translator: R_SACI <rgebbid@gmail.com>\n"
 "Language-Team: Kabyle <https://hosted.weblate.org/projects/signature-pdf/"
@@ -48,6 +48,9 @@ msgid ""
 "The PDF will be processed by the server without being retained or stored"
 msgstr "Afaylu PDF ad yettusesfer s uqeddac war ma yettwaḥraz neɣ yettwasekles"
 
+msgid "Your pdf is already optimized"
+msgstr ""
+
 msgid "Compress"
 msgstr "Ssed"
 
diff --git a/locale/kab/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo b/locale/kab/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
similarity index 100%
rename from locale/kab/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo
rename to locale/kab/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
diff --git a/locale/oc/LC_MESSAGES/application.mo b/locale/oc/LC_MESSAGES/application.mo
index 99e65c0..5a1015b 100644
Binary files a/locale/oc/LC_MESSAGES/application.mo and b/locale/oc/LC_MESSAGES/application.mo differ
diff --git a/locale/oc/LC_MESSAGES/application.po b/locale/oc/LC_MESSAGES/application.po
index 8b14ff4..f2f1d2e 100644
--- a/locale/oc/LC_MESSAGES/application.po
+++ b/locale/oc/LC_MESSAGES/application.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2023-09-29 11:06+0200\n"
+"POT-Creation-Date: 2023-10-24 17:21+0200\n"
 "PO-Revision-Date: 2023-09-30 00:00+0000\n"
 "Last-Translator: Quentin PAGÈS <quentinantonin@free.fr>\n"
 "Language-Team: Occitan <https://hosted.weblate.org/projects/signature-pdf/"
@@ -48,6 +48,9 @@ msgid ""
 "The PDF will be processed by the server without being retained or stored"
 msgstr "Lo servidor tractarà lo PDF sens lo servar o gardar"
 
+msgid "Your pdf is already optimized"
+msgstr ""
+
 msgid "Compress"
 msgstr "Compressar"
 
diff --git a/locale/oc/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo b/locale/oc/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
similarity index 100%
rename from locale/oc/LC_MESSAGES/application_7b6a264dde56b2de3396e3739e066007.mo
rename to locale/oc/LC_MESSAGES/application_35294e16757c3d30edc4fc9ce3867679.mo
diff --git a/public/js/compress.js b/public/js/compress.js
index 3877959..9f0f92e 100644
--- a/public/js/compress.js
+++ b/public/js/compress.js
@@ -10,4 +10,26 @@ function handleFileChange() {
         compressBtn.disabled = true;
         dropdownCompressBtn.disabled = true;
     }
+
+    document.getElementById('input_pdf_upload').addEventListener('change', async function(event) {
+        uploadAndLoadPDF(this);
+    });
+}
+
+var uploadAndLoadPDF = async function(input_upload) {
+    const cache = await caches.open('pdf');
+    for (let i = 0; i < input_upload.files.length; i++) {
+        if(input_upload.files[i].size > maxSize) {
+
+            alert("Le PDF ne doit pas dépasser " + Math.round(maxSize/1024/1024) + " Mo");
+            break;
+        }
+        let filename = input_upload.files[i].name;
+        let response = new Response(input_upload.files[i], { "status" : 200, "statusText" : "OK" });
+        let urlPdf = '/pdf/'+filename;
+        await cache.put(urlPdf, response);
+        let pdfBlob = await getPDFBlobFromCache(urlPdf);
+        nbPDF++;
+        await loadPDF(pdfBlob, filename, nbPDF);
+    }
 }
\ No newline at end of file
diff --git a/templates/compress.html.php b/templates/compress.html.php
index 6576e5e..8d493ea 100644
--- a/templates/compress.html.php
+++ b/templates/compress.html.php
@@ -29,6 +29,11 @@
                     <label class="form-label mt-3" for="input_pdf_upload"><?php echo _("Choose a PDF"); ?> <small class="opacity-75" style="cursor: help" title="<?php echo _("The PDF must not exceed "); ?> <?php echo round($maxSize / 1024 / 1024) ?> <?php echo _("Mb"); ?>"><i class="bi bi-info-circle"></i></small></label>
                     <input name="input_pdf_upload" id="input_pdf_upload" placeholder="<?php echo _("Choose a PDF"); ?>" class="form-control form-control-lg" type="file" accept=".pdf,application/pdf" onchange="handleFileChange()" />
                     <p class="mt-2 small fw-light text-dark"><?php echo _("The PDF will be processed by the server without being retained or stored") ?></p>
+                    <?php if ($error_message == "PDF optimized"): ?>
+                        <div class="alert alert-danger">
+                            <p><?php echo _("Your pdf is already optimized"); ?></p>
+                        </div>
+                    <?php endif; ?>
                     <div class="btn-group">
                         <button type="submit" name="compressionType" value="medium" id="compressBtn" class="btn btn-primary" disabled><i class="bi bi-download"></i> <?php echo _("Compress"); ?></button>
                         <button type="button" id="dropdownMenuReference" class="btn btn-outline-primary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false" data-bs-reference="parent" disabled>