diff --git a/VERSION b/VERSION
index 37f6d20..c9307ce 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.2307.50127
+0.2307.52303
diff --git a/src/ByteFormat.php b/src/ByteFormat.php
new file mode 100644
index 0000000..9478c1a
--- /dev/null
+++ b/src/ByteFormat.php
@@ -0,0 +1,85 @@
+<?php
+// ByteFormat.php
+// Created: 2023-07-05
+// Updated: 2023-07-05
+
+namespace Index;
+
+final class ByteFormat {
+    /**
+     * Whether the default behaviour for the format function is decimal (power of 10) or not (power of 2).
+     *
+     * @var bool
+     */
+    public const DECIMAL_DEFAULT = true;
+
+    private const SYMBOLS = ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y', 'R', 'Q'];
+    private const DIV_DECIMAL = 1000;
+    private const DIV_BINARY = 1024;
+
+    /**
+     * Formats a raw amount of bytes as a human readable string.
+     *
+     * @param int $bytes Number of bytes.
+     * @param bool $decimal Whether format as a power of 10 (e.g. MB) or a power of 2 (e.g. MiB).
+     * @return string Formatted byte string.
+     */
+    public static function format(int $bytes, bool $decimal = self::DECIMAL_DEFAULT): string {
+        // this whole thing will be fun if i ever decide to do localisation
+        if($bytes === 0)
+            return 'Zero Bytes';
+
+        $negative = $bytes < 0;
+        $bytes = abs($bytes);
+
+        $power = $decimal ? self::DIV_DECIMAL : self::DIV_BINARY;
+        $exp = floor(log($bytes) / log($power));
+
+        $number = $bytes / pow($power, $exp);
+        $symbol = self::SYMBOLS[$exp];
+
+        $string = '';
+        if($negative)
+            $string .= '-';
+
+        if($bytes < $power)
+            $string .= $number;
+        else if($number < 10)
+            $string .= sprintf('%.2f', $number);
+        else
+            $string .= sprintf('%.1f', $number);
+
+        $string .= ' ' . $symbol;
+        if($symbol === '') {
+            $string .= 'Byte';
+            if($number > 1)
+                $string .= 's';
+        } else {
+            if(!$decimal)
+                $string .= 'i';
+            $string .= 'B';
+        }
+
+        return $string;
+    }
+
+    /**
+     * Formats a raw amount of bytes as a human readable string in the power of 10 (e.g. MB).
+     *
+     * @param int $bytes Number of bytes.
+     * @return string Formatted byte string.
+     */
+    public static function formatDecimal(int $bytes): string {
+        return self::format($bytes, true);
+    }
+
+    /**
+     * Formats a raw amount of bytes as a human readable string in the power of 2 (e.g. MiB).
+     *
+     * @param int $bytes Number of bytes.
+     * @return string Formatted byte string.
+     */
+    public static function formatBinary(int $bytes): string {
+        return self::format($bytes, false);
+    }
+}
diff --git a/src/XString.php b/src/XString.php
index 61f527e..6651495 100644
--- a/src/XString.php
+++ b/src/XString.php
@@ -42,7 +42,7 @@ final class XString {
     /**
      * Counts unique characters in a string.
      *
-     * @param string String to count unique characters of.
+     * @param string $string String to count unique characters of.
      * @return int Unique character count.
      */
     public static function countUnique(string $string): int {
diff --git a/tests/ByteFormatTest.php b/tests/ByteFormatTest.php
new file mode 100644
index 0000000..270ebfc
--- /dev/null
+++ b/tests/ByteFormatTest.php
@@ -0,0 +1,103 @@
+<?php
+// ByteFormatTest.php
+// Created: 2023-07-05
+// Updated: 2023-07-05
+
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+use Index\ByteFormat;
+
+/**
+ * @covers ByteFormat
+ */
+final class ByteFormatTest extends TestCase {
+    public function testFormat(): void {
+        $this->assertEquals(ByteFormat::formatDecimal(0), 'Zero Bytes');
+        $this->assertEquals(ByteFormat::formatBinary(0), 'Zero Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(64), '64 Bytes');
+        $this->assertEquals(ByteFormat::formatBinary(64), '64 Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-64), '-64 Bytes');
+        $this->assertEquals(ByteFormat::formatBinary(-64), '-64 Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(512), '512 Bytes');
+        $this->assertEquals(ByteFormat::formatBinary(512), '512 Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-512), '-512 Bytes');
+        $this->assertEquals(ByteFormat::formatBinary(-512), '-512 Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1000), '1.00 KB');
+        $this->assertEquals(ByteFormat::formatBinary(1000), '1000 Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1000), '-1.00 KB');
+        $this->assertEquals(ByteFormat::formatBinary(-1000), '-1000 Bytes');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1024), '1.02 KB');
+        $this->assertEquals(ByteFormat::formatBinary(1024), '1.00 KiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1024), '-1.02 KB');
+        $this->assertEquals(ByteFormat::formatBinary(-1024), '-1.00 KiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1000000), '1.00 MB');
+        $this->assertEquals(ByteFormat::formatBinary(1000000), '976.6 KiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1000000), '-1.00 MB');
+        $this->assertEquals(ByteFormat::formatBinary(-1000000), '-976.6 KiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1048576), '1.05 MB');
+        $this->assertEquals(ByteFormat::formatBinary(1048576), '1.00 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1048576), '-1.05 MB');
+        $this->assertEquals(ByteFormat::formatBinary(-1048576), '-1.00 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(25252525), '25.3 MB');
+        $this->assertEquals(ByteFormat::formatBinary(25252525), '24.1 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-25252525), '-25.3 MB');
+        $this->assertEquals(ByteFormat::formatBinary(-25252525), '-24.1 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(26476544), '26.5 MB');
+        $this->assertEquals(ByteFormat::formatBinary(26476544), '25.2 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-26476544), '-26.5 MB');
+        $this->assertEquals(ByteFormat::formatBinary(-26476544), '-25.2 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1000000000), '1.00 GB');
+        $this->assertEquals(ByteFormat::formatBinary(1000000000), '953.7 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1000000000), '-1.00 GB');
+        $this->assertEquals(ByteFormat::formatBinary(-1000000000), '-953.7 MiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1073741824), '1.07 GB');
+        $this->assertEquals(ByteFormat::formatBinary(1073741824), '1.00 GiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1073741824), '-1.07 GB');
+        $this->assertEquals(ByteFormat::formatBinary(-1073741824), '-1.00 GiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1000000000000), '1.00 TB');
+        $this->assertEquals(ByteFormat::formatBinary(1000000000000), '931.3 GiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1000000000000), '-1.00 TB');
+        $this->assertEquals(ByteFormat::formatBinary(-1000000000000), '-931.3 GiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1099511627776), '1.10 TB');
+        $this->assertEquals(ByteFormat::formatBinary(1099511627776), '1.00 TiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1099511627776), '-1.10 TB');
+        $this->assertEquals(ByteFormat::formatBinary(-1099511627776), '-1.00 TiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1000000000000000), '1.00 PB');
+        $this->assertEquals(ByteFormat::formatBinary(1000000000000000), '909.5 TiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1000000000000000), '-1.00 PB');
+        $this->assertEquals(ByteFormat::formatBinary(-1000000000000000), '-909.5 TiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(1125899906842624), '1.13 PB');
+        $this->assertEquals(ByteFormat::formatBinary(1125899906842624), '1.00 PiB');
+
+        $this->assertEquals(ByteFormat::formatDecimal(-1125899906842624), '-1.13 PB');
+        $this->assertEquals(ByteFormat::formatBinary(-1125899906842624), '-1.00 PiB');
+    }
+}