diff --git a/src/core/lib/Binary.mjs b/src/core/lib/Binary.mjs
index d28691e5..dc63fc58 100644
--- a/src/core/lib/Binary.mjs
+++ b/src/core/lib/Binary.mjs
@@ -7,6 +7,7 @@
  */
 
 import Utils from "../Utils.mjs";
+import OperationError from "../errors/OperationError.mjs";
 
 
 /**
@@ -58,6 +59,9 @@ export function toBinary(data, delim="Space", padding=8) {
  * fromBinary("00010000:00100000:00110000", "Colon");
  */
 export function fromBinary(data, delim="Space", byteLen=8) {
+    if (byteLen < 1 || Math.round(byteLen) !== byteLen)
+        throw new OperationError("Byte length must be a positive integer");
+
     const delimRegex = Utils.regexRep(delim);
     data = data.replace(delimRegex, "");
 
diff --git a/src/core/lib/Hex.mjs b/src/core/lib/Hex.mjs
index 9c70e91c..b7e8e908 100644
--- a/src/core/lib/Hex.mjs
+++ b/src/core/lib/Hex.mjs
@@ -7,6 +7,7 @@
  */
 
 import Utils from "../Utils.mjs";
+import OperationError from "../errors/OperationError.mjs";
 
 
 /**
@@ -100,6 +101,9 @@ export function toHexFast(data) {
  * fromHex("0a:14:1e", "Colon");
  */
 export function fromHex(data, delim="Auto", byteLen=2) {
+    if (byteLen < 1 || Math.round(byteLen) !== byteLen)
+        throw new OperationError("Byte length must be a positive integer");
+
     if (delim !== "None") {
         const delimRegex = delim === "Auto" ? /[^a-f\d]|(0x)/gi : Utils.regexRep(delim);
         data = data.replace(delimRegex, "");
diff --git a/src/core/lib/PublicKey.mjs b/src/core/lib/PublicKey.mjs
index 9ec990fe..8c04cdd9 100644
--- a/src/core/lib/PublicKey.mjs
+++ b/src/core/lib/PublicKey.mjs
@@ -15,7 +15,7 @@ import { toHex, fromHex } from "./Hex.mjs";
  * @param {number} indent
  * @returns {string}
  */
-export function formatDnStr (dnStr, indent) {
+export function formatDnStr(dnStr, indent) {
     const fields = dnStr.substr(1).replace(/([^\\])\//g, "$1$1/").split(/[^\\]\//);
     let output = "",
         maxKeyLen = 0,
@@ -54,7 +54,7 @@ export function formatDnStr (dnStr, indent) {
  * @param {number} indent
  * @returns {string}
  */
-export function formatByteStr (byteStr, length, indent) {
+export function formatByteStr(byteStr, length, indent) {
     byteStr = toHex(fromHex(byteStr), ":");
     length = length * 3;
     let output = "";
diff --git a/src/core/operations/FromBinary.mjs b/src/core/operations/FromBinary.mjs
index 0bb7a45c..9a51fc8b 100644
--- a/src/core/operations/FromBinary.mjs
+++ b/src/core/operations/FromBinary.mjs
@@ -35,7 +35,8 @@ class FromBinary extends Operation {
             {
                 "name": "Byte Length",
                 "type": "number",
-                "value": 8
+                "value": 8,
+                "min": 1
             }
         ];
         this.checks = [
diff --git a/src/core/operations/ToHexdump.mjs b/src/core/operations/ToHexdump.mjs
index ed212ce4..c657adeb 100644
--- a/src/core/operations/ToHexdump.mjs
+++ b/src/core/operations/ToHexdump.mjs
@@ -6,6 +6,7 @@
 
 import Operation from "../Operation.mjs";
 import Utils from "../Utils.mjs";
+import OperationError from "../errors/OperationError.mjs";
 
 /**
  * To Hexdump operation
@@ -28,7 +29,8 @@ class ToHexdump extends Operation {
             {
                 "name": "Width",
                 "type": "number",
-                "value": 16
+                "value": 16,
+                "min": 1
             },
             {
                 "name": "Upper case hex",
@@ -58,6 +60,9 @@ class ToHexdump extends Operation {
         const [length, upperCase, includeFinalLength, unixFormat] = args;
         const padding = 2;
 
+        if (length < 1 || Math.round(length) !== length)
+            throw new OperationError("Width must be a positive integer");
+
         let output = "";
         for (let i = 0; i < data.length; i += length) {
             const buff = data.slice(i, i+length);