diff --git a/README.md b/README.md
index 3769777..8307d2a 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,30 @@ docker run \
     dockette/adminer:dg
 ```
 
+You can also prefill login credentials through environment variables.
+
+- `ADMINER_DRIVER` (example: `pgsql`, `mysql`, `sqlite`, ...)
+- `ADMINER_SERVER` (hostname or host:port)
+- `ADMINER_USERNAME`
+- `ADMINER_PASSWORD`
+- `ADMINER_DB` (default database)
+- `ADMINER_AUTOLOGIN=1` (submit the login form automatically once)
+- `ADMINER_NAME` (overrides page title and heading)
+
+```sh
+docker run \
+    --rm \
+    -p 8000:80 \
+    -e ADMINER_DRIVER=pgsql \
+    -e ADMINER_SERVER=postgres \
+    -e ADMINER_USERNAME=adminer \
+    -e ADMINER_PASSWORD=adminer \
+    -e ADMINER_DB=adminer \
+    -e ADMINER_AUTOLOGIN=1 \
+    -e ADMINER_NAME="Staging DB" \
+    dockette/adminer:full
+```
+
 ## Versions
 
 | Image                        | Technologies                          | Size | Docker Hub                                              |
diff --git a/adminer-dg/entrypoint.sh b/adminer-dg/entrypoint.sh
index 74f102f..dad07f3 100644
--- a/adminer-dg/entrypoint.sh
+++ b/adminer-dg/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}
diff --git a/adminer-editor/entrypoint.sh b/adminer-editor/entrypoint.sh
index 5392f67..d44c98e 100644
--- a/adminer-editor/entrypoint.sh
+++ b/adminer-editor/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer Editor..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}
diff --git a/adminer-full/entrypoint.sh b/adminer-full/entrypoint.sh
index 03202b8..94ac5e3 100644
--- a/adminer-full/entrypoint.sh
+++ b/adminer-full/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Copy driver plugins from /srv/plugins/drivers to /srv/adminer-plugins
 if [ -d "/srv/plugins/drivers" ]; then
     cp -r /srv/plugins/drivers/* /srv/adminer-plugins/ 2>/dev/null || true
diff --git a/adminer-mongo/entrypoint.sh b/adminer-mongo/entrypoint.sh
index 2b652d2..1e607f6 100644
--- a/adminer-mongo/entrypoint.sh
+++ b/adminer-mongo/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer (MongoDB)..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}
diff --git a/adminer-mysql/entrypoint.sh b/adminer-mysql/entrypoint.sh
index 60ae177..a81a938 100644
--- a/adminer-mysql/entrypoint.sh
+++ b/adminer-mysql/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer (MySQL)..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}
diff --git a/adminer-oracle-11/entrypoint.sh b/adminer-oracle-11/entrypoint.sh
index 4200bb0..a9741d3 100644
--- a/adminer-oracle-11/entrypoint.sh
+++ b/adminer-oracle-11/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer (Oracle 11)..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}
diff --git a/adminer-oracle-12/entrypoint.sh b/adminer-oracle-12/entrypoint.sh
index a9e4a2b..85d7e18 100644
--- a/adminer-oracle-12/entrypoint.sh
+++ b/adminer-oracle-12/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer (Oracle 12)..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}
diff --git a/adminer-postgres/entrypoint.sh b/adminer-postgres/entrypoint.sh
index a522d07..c8a96fd 100644
--- a/adminer-postgres/entrypoint.sh
+++ b/adminer-postgres/entrypoint.sh
@@ -19,6 +19,69 @@ fi
 
 echo "[adminer] Loading Adminer (PostgreSQL)..."
 
+if [ -f /srv/index.php ]; then
+    cat > /srv/.adminer-env-bootstrap.php <<'PHP'
+<?php
+$adminerFields = [
+    'auth[driver]' => (string) getenv('ADMINER_DRIVER'),
+    'auth[server]' => (string) getenv('ADMINER_SERVER'),
+    'auth[username]' => (string) getenv('ADMINER_USERNAME'),
+    'auth[password]' => (string) getenv('ADMINER_PASSWORD'),
+    'auth[db]' => (string) getenv('ADMINER_DB'),
+];
+$adminerFields = array_filter($adminerFields, static fn ($value) => $value !== '');
+$adminerTitle = (string) getenv('ADMINER_NAME');
+$adminerAutologin = in_array(
+    strtolower((string) getenv('ADMINER_AUTOLOGIN')),
+    ['1', 'true', 'yes', 'on'],
+    true
+);
+
+if (!empty($_GET['file'])) {
+    return;
+}
+
+if ($adminerFields === [] && $adminerTitle === '' && !$adminerAutologin) {
+    return;
+}
+
+$adminerPayload = [
+    'fields' => $adminerFields,
+    'title' => $adminerTitle,
+    'autologin' => $adminerAutologin,
+];
+
+ob_start(static function ($html) use ($adminerPayload) {
+    if (!is_string($html) || stripos($html, '<html') === false) {
+        return $html;
+    }
+
+    $json = json_encode($adminerPayload, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+    if ($json === false) {
+        return $html;
+    }
+
+    $script = '<script>(function(){var config=' . $json . ';var loginInput=document.querySelector(' . json_encode('input[name="auth[server]"]') . ');if(!loginInput||!loginInput.form){return;}var form=loginInput.form;Object.keys(config.fields).forEach(function(name){var field=form.querySelector("[name=\""+name+"\"]");if(field){field.value=config.fields[name];}});if(config.title){document.title=config.title;var heading=document.querySelector("h1");if(heading){heading.textContent=config.title;}}if(config.autologin){var attemptKey="dockette-adminer-autologin";var usernameField=form.querySelector(' . json_encode('[name="auth[username]"]') . ');if(usernameField&&usernameField.value&&loginInput.value&&!sessionStorage.getItem(attemptKey)){sessionStorage.setItem(attemptKey,"1");form.submit();}}})();</script>';
+
+    if (stripos($html, '</body>') !== false) {
+        return preg_replace('~</body>~i', $script . '</body>', $html, 1) ?? ($html . $script);
+    }
+
+    return $html . $script;
+});
+PHP
+
+    if [ ! -f /srv/.adminer-index-original.php ]; then
+        cp /srv/index.php /srv/.adminer-index-original.php
+    fi
+
+    cat > /srv/index.php <<'PHP'
+<?php
+require __DIR__ . '/.adminer-env-bootstrap.php';
+require __DIR__ . '/.adminer-index-original.php';
+PHP
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}