diff --git a/composer.json b/composer.json
index 3df7d57..24f51c6 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,10 @@
         "quillstack/unit-tests": "^0.2.15"
     },
     "require": {
-        "psr/log": "^3.0"
+        "ext-json": "*",
+        "psr/log": "^3.0",
+        "quillstack/di": "^0.0.8",
+        "quillstack/local-storage": "^0.0.6"
     },
     "extra": {
         "branch-alias": {
diff --git a/src/Exceptions/HandlerNotSetException.php b/src/Exceptions/HandlerNotSetException.php
new file mode 100644
index 0000000..8a9d193
--- /dev/null
+++ b/src/Exceptions/HandlerNotSetException.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Quillstack\Logger\Exceptions;
+
+use Quillstack\Logger\LoggerException;
+
+class HandlerNotSetException extends LoggerException
+{
+    //
+}
diff --git a/src/HandlerInterface.php b/src/HandlerInterface.php
new file mode 100644
index 0000000..f284faf
--- /dev/null
+++ b/src/HandlerInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Quillstack\Logger;
+
+interface HandlerInterface
+{
+    public function log($level, \Stringable|string $message, array $context = []): bool;
+}
diff --git a/src/Handlers/LocalStorageHandler.php b/src/Handlers/LocalStorageHandler.php
new file mode 100644
index 0000000..b5b4f23
--- /dev/null
+++ b/src/Handlers/LocalStorageHandler.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Quillstack\Logger\Handlers;
+
+use Quillstack\LocalStorage\LocalStorage;
+use Quillstack\Logger\HandlerInterface;
+
+class LocalStorageHandler implements HandlerInterface
+{
+    public function __construct(private string $path, private LocalStorage $localStorage)
+    {
+        //
+    }
+
+    public function log($level, \Stringable|string $message, array $context = []): bool
+    {
+        $line = $level . ' ' . $message . ' ' . json_encode($context);
+
+        return $this->localStorage->save($this->path, $line);
+    }
+}
diff --git a/src/Logger.php b/src/Logger.php
new file mode 100644
index 0000000..ef45ac1
--- /dev/null
+++ b/src/Logger.php
@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Quillstack\Logger;
+
+use Psr\Log\LoggerInterface;
+use Psr\Log\LogLevel;
+use Quillstack\Logger\Exceptions\HandlerNotSetException;
+
+class Logger implements LoggerInterface
+{
+    private ?HandlerInterface $handler;
+
+    /**
+     * Sets handler object (mandatory).
+     */
+    public function setHandler(HandlerInterface $handler): void
+    {
+        $this->handler = $handler;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function emergency(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::EMERGENCY, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function alert(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::ALERT, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function critical(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::CRITICAL, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function error(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::ERROR, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function warning(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::WARNING, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function notice(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::NOTICE, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function info(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::INFO, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function debug(\Stringable|string $message, array $context = []): void
+    {
+        $this->log(LogLevel::DEBUG, $message, $context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function log($level, \Stringable|string $message, array $context = []): void
+    {
+        if ($this->handler === null) {
+            throw new HandlerNotSetException();
+        }
+
+        $this->handler->log($level, $message, $context);
+    }
+}
diff --git a/src/LoggerException.php b/src/LoggerException.php
new file mode 100644
index 0000000..37d843e
--- /dev/null
+++ b/src/LoggerException.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Quillstack\Logger;
+
+class LoggerException extends \RuntimeException
+{
+    //
+}