diff --git a/action.php b/action.php
index 4ef89d1..ac2d894 100644
--- a/action.php
+++ b/action.php
@@ -672,6 +672,47 @@ switch ($VARS['action']) {
 
         exit(GenerateReceipt::outputReceipt($receipt, $format, $width, "Z Report"));
         break;
+    case "editcertificate":
+        $insert = true;
+        $code = $VARS['code'];
+        $amount = $VARS['balance'];
+        if (empty($VARS['id'])) {
+            $insert = true;
+        } else {
+            if ($database->has('certificates', ['certid' => $VARS['id']])) {
+                $insert = false;
+            } else {
+                returnToSender("invalid_parameters");
+            }
+        }
+
+        if ($insert && (is_empty($code) || $database->has('certificates', ['certcode' => $code]))) {
+            do {
+                $code = random_int(100000000000, 999999999999);
+            } while ($database->has('certificates', ['certcode' => $code]));
+        }
+
+        if (!is_numeric($amount)) {
+            returnToSender("invalid_parameters");
+        }
+
+        if ($insert) {
+            $database->insert('certificates', [
+                'certcode' => $code,
+                'amount' => $amount,
+                'start_amount' => $amount,
+                'issued' => date('Y-m-d H:i:s'),
+                'deleted' => 0]);
+            returnToSender("card_x_added", $code);
+        } else {
+            $database->update('certificates', [
+                'amount' => $amount
+                    ], [
+                'certid' => $VARS['id']
+            ]);
+            returnToSender("card_x_saved", $code);
+        }
+        break;
     case "session_keepalive":
         header("Content-Type: application/json");
         exit(json_encode(["status" => "OK"]));
diff --git a/lang/en_us.php b/lang/en_us.php
index 274ad8a..32d1639 100644
--- a/lang/en_us.php
+++ b/lang/en_us.php
@@ -124,5 +124,16 @@ define("STRINGS", [
     "return" => "Return",
     "enter refund" => "Enter Refund",
     "refund" => "Refund",
-    "cannot edit return transaction" => "Cannot edit a return transaction."
+    "cannot edit return transaction" => "Cannot edit a return transaction.",
+    "gift cards" => "Gift Cards",
+    "add card" => "Add Card",
+    "card number" => "Card Number",
+    "start balance" => "Starting Balance",
+    "issued" => "Issued",
+    "editing card x" => "Editing card {code}",
+    "adding card" => "Adding card",
+    "card added" => "Gift card added.",
+    "card saved" => "Gift card updated.",
+    "card x added" => "Gift card #{arg} added.",
+    "card x saved" => "Gift card #{arg} updated.",
 ]);
diff --git a/lang/messages.php b/lang/messages.php
index 7336b33..e78e17f 100644
--- a/lang/messages.php
+++ b/lang/messages.php
@@ -53,4 +53,12 @@ define("MESSAGES", [
         "string" => "cannot edit return transaction",
         "type" => "danger"
     ],
+    "card_x_added" => [
+        "string" => "card x added",
+        "type" => "success"
+    ],
+    "card_x_saved" => [
+        "string" => "card x saved",
+        "type" => "success"
+    ],
 ]);
diff --git a/pages.php b/pages.php
index afcb399..43d48a0 100644
--- a/pages.php
+++ b/pages.php
@@ -81,6 +81,28 @@ define("PAGES", [
             "static/js/editregister.js"
         ]
     ],
+    "certificates" => [
+        "title" => "gift cards",
+        "navbar" => true,
+        "icon" => "fas fa-gift",
+        "styles" => [
+            "static/css/datatables.min.css",
+            "static/css/tables.css"
+        ],
+        "scripts" => [
+            "static/js/bsalert.js",
+            "static/js/datatables.min.js",
+            "static/js/certificates.js"
+        ],
+    ],
+    "editcertificate" => [
+        "title" => "edit certificate",
+        "navbar" => false,
+        "scripts" => [
+            "static/js/input_type_money.js",
+            "static/js/editcertificate.js"
+        ]
+    ],
     "reports" => [
         "title" => "reports",
         "navbar" => true,
diff --git a/pages/certificates.php b/pages/certificates.php
new file mode 100644
index 0000000..2a1611c
--- /dev/null
+++ b/pages/certificates.php
@@ -0,0 +1,60 @@
+<?php
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+require_once __DIR__ . "/../required.php";
+
+use Medoo\Medoo;
+
+redirectIfNotLoggedIn();
+
+$cards = $database->select('certificates', ['certid (id)', 'certcode (code)', 'amount', 'start_amount (start)', 'issued'], ['deleted[!]' => 1]);
+?>
+
+<div class="btn-toolbar">
+    <a href="app.php?page=editcertificate" class="btn btn-success"><i class="fas fa-plus"></i> <?php lang("add card"); ?></a>
+</div>
+
+<table id="certificatetable" class="table table-bordered table-hover table-sm">
+    <thead>
+        <tr>
+            <th data-priority="0"></th>
+            <th data-priority="1"><?php lang('actions'); ?></th>
+            <th data-priority="1"><i class="fas fa-fw fa-hashtag d-none d-md-inline"></i> <?php lang('card number'); ?></th>
+            <th data-priority="2"><i class="fas fa-fw fa-balance-scale d-none d-md-inline"></i> <?php lang('balance'); ?></th>
+            <th data-priority="3"><i class="fas fa-fw fa-play d-none d-md-inline"></i> <?php lang('start balance'); ?></th>
+            <th data-priority="4"><i class="fas fa-fw fa-calendar d-none d-md-inline"></i> <?php lang('issued'); ?></th>
+        </tr>
+    </thead>
+    <tbody>
+        <?php
+        foreach ($cards as $c) {
+            ?>
+            <tr>
+                <td></td>
+                <td>
+                    <a class="btn btn-primary btn-sm" href="app.php?page=editcertificate&id=<?php echo $c['id']; ?>"><i class="fas fa-edit"></i> <?php lang("edit"); ?></a>
+                </td>
+                <td><?php echo $c['code']; ?></td>
+                <td>$<?php echo number_format($c['amount'], 2); ?></td>
+                <td>$<?php echo number_format($c['start'], 2); ?></td>
+                <td><?php echo date(DATETIME_FORMAT, strtotime($c['issued'])); ?></td>
+            </tr>
+            <?php
+        }
+        ?>
+    </tbody>
+    <tfoot>
+        <tr>
+            <th data-priority="0"></th>
+            <th data-priority="1"><?php lang('actions'); ?></th>
+            <th data-priority="1"><i class="fas fa-fw fa-hashtag d-none d-md-inline"></i> <?php lang('card number'); ?></th>
+            <th data-priority="2"><i class="fas fa-fw fa-balance-scale d-none d-md-inline"></i> <?php lang('balance'); ?></th>
+            <th data-priority="3"><i class="fas fa-fw fa-play d-none d-md-inline"></i> <?php lang('start balance'); ?></th>
+            <th data-priority="4"><i class="fas fa-fw fa-calendar d-none d-md-inline"></i> <?php lang('issued'); ?></th>
+        </tr>
+    </tfoot>
+</table>
\ No newline at end of file
diff --git a/pages/editcertificate.php b/pages/editcertificate.php
new file mode 100644
index 0000000..5f7fe4d
--- /dev/null
+++ b/pages/editcertificate.php
@@ -0,0 +1,82 @@
+<?php
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+require_once __DIR__ . '/../required.php';
+
+redirectifnotloggedin();
+
+$carddata = [
+    'id' => '',
+    'code' => '',
+    'amount' => 0,
+    'start' => 0
+];
+
+$editing = false;
+
+if (!empty($VARS['id']) && !is_empty($VARS['id'])) {
+    if ($database->has('certificates', ['certid' => $VARS['id']])) {
+        $editing = true;
+        $carddata = $database->get(
+                'certificates', [
+            'certid (id)',
+            'certcode (code)',
+            'amount',
+            'start_amount (start)'
+                ], [
+            'certid' => $VARS['id']
+        ]);
+    } else {
+        // customer id is invalid, redirect to a version of the page that won't
+        // cause an error when pressing Save
+        header('Location: app.php?page=editcertificate');
+        die();
+    }
+}
+
+if (!$editing) {
+    // Generate gift certificate number
+    do {
+        $carddata['code'] = random_int(100000000000, 999999999999);
+    } while ($database->has('certificates', ['certcode' => $carddata['code']]));
+}
+?>
+
+<form role="form" action="action.php" method="POST">
+    <div class="card border-green">
+        <h3 class="card-header text-green">
+            <?php
+            if ($editing) {
+                ?>
+                <i class="fas fa-edit"></i> <?php lang2("editing card x", ['code' => htmlspecialchars($carddata['code'])]); ?>
+                <?php
+            } else {
+                ?>
+                <i class="fas fa-edit"></i> <?php lang("adding card"); ?>
+                <?php
+            }
+            ?>
+        </h3>
+        <div class="card-body row">
+            <div class="form-group col-sm-6">
+                <label for="code"><i class="fas fa-hashtag"></i> <?php lang("card number"); ?></label>
+                <input type="text" class="form-control disabled" id="code" value="<?php echo $carddata['code']; ?>" disabled />
+            </div>
+            <div class="form-group col-sm-6">
+                <label for="balance"><i class="fas fa-balance-scale"></i> <?php lang("balance"); ?></label>
+                <input type="money" class="form-control" id="balance" name="balance" value="<?php echo number_format($carddata['amount'], 2); ?>" />
+            </div>
+        </div>
+
+        <input type="hidden" name="id" value="<?php echo $carddata['id']; ?>" />
+        <input type="hidden" name="code" value="<?php echo $carddata['code']; ?>" />
+        <input type="hidden" name="action" value="editcertificate" />
+        <input type="hidden" name="source" value="certificates" />
+
+        <div class="card-footer d-flex">
+            <button type="submit" class="btn btn-success mr-auto"><i class="fas fa-save"></i> <?php lang("save"); ?></button>
+        </div>
+    </div>
+</form>
\ No newline at end of file
diff --git a/static/js/certificates.js b/static/js/certificates.js
new file mode 100644
index 0000000..c098b18
--- /dev/null
+++ b/static/js/certificates.js
@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+var certificatetable = $('#certificatetable').DataTable({
+    responsive: {
+        details: {
+            display: $.fn.dataTable.Responsive.display.modal({
+                header: function (row) {
+                    var data = row.data();
+                    return "<i class=\"fas fa-hashtag fa-fw\"></i> " + data[2];
+                }
+            }),
+            renderer: $.fn.dataTable.Responsive.renderer.tableAll({
+                tableClass: 'table'
+            }),
+            type: "column"
+        }
+    },
+    columnDefs: [
+        {
+            targets: 0,
+            className: 'control',
+            orderable: false
+        },
+        {
+            targets: 1,
+            orderable: false
+        }
+    ],
+    order: [
+        [5, 'asc']
+    ]
+});
\ No newline at end of file