diff --git a/app.php b/app.php
index 650b6b9..354f687 100644
--- a/app.php
+++ b/app.php
@@ -405,6 +405,7 @@ $f3->route('GET /metadata',
 
 $f3->route('GET /compress',
     function($f3) {
+        $f3->set('maxSize',  min(array(convertPHPSizeToBytes(ini_get('post_max_size')), convertPHPSizeToBytes(ini_get('upload_max_filesize')))));
         $f3->set('activeTab', 'compress');
         echo View::instance()->render('compress.html.php');
     }
diff --git a/templates/compress.html.php b/templates/compress.html.php
index cd5030b..b24504c 100644
--- a/templates/compress.html.php
+++ b/templates/compress.html.php
@@ -26,7 +26,7 @@
             <p class="fw-light mb-3 subtitle text-dark text-nowrap" style="overflow: hidden; text-overflow: ellipsis;"><?php echo _("Reduce the size of a PDF"); ?></p>
             <div class="col-md-6 col-lg-5 col-xl-4 col-xxl-3 mx-auto">
                 <div class="col-12">
-                    <label class="form-label mt-3" for="input_pdf_upload"><?php echo _("Choose a PDF"); ?></label>
+                    <label class="form-label mt-3" for="input_pdf_upload"><?php echo _("Choose a PDF"); ?> <small class="opacity-75" style="cursor: help" title="<?php echo _("The PDF must not exceed "); ?> <?php echo round($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 stored or saved") ?></p>
                     <div class="btn-group">