diff --git a/src/utils.ts b/src/utils.ts
index 24973b7..faafdc8 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -337,3 +337,37 @@ export function generateDefaultConfigFile(
 
   return writeFileSync(filename, iniFileContent);
 }
+
+/**
+ * Format bytes as human-readable text.
+ *
+ * @param bytes Number of bytes.
+ * @param si True to use metric (SI) units, aka powers of 1000. False to use
+ *           binary (IEC), aka powers of 1024.
+ * @param dp Number of decimal places to display.
+ *
+ * @return Formatted string.
+ */
+export function humanFileSize(bytes, si = false, dp = 1) {
+  const thresh = si ? 1000 : 1024;
+
+  if (Math.abs(bytes) < thresh) {
+    return bytes + " B";
+  }
+
+  const units = si
+    ? ["kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
+    : ["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"];
+  let u = -1;
+  const r = 10 ** dp;
+
+  do {
+    bytes /= thresh;
+    ++u;
+  } while (
+    Math.round(Math.abs(bytes) * r) / r >= thresh &&
+    u < units.length - 1
+  );
+
+  return bytes.toFixed(dp) + " " + units[u];
+}