diff --git a/packages/utils/package.json b/packages/utils/package.json
new file mode 100644
index 00000000..7773238b
--- /dev/null
+++ b/packages/utils/package.json
@@ -0,0 +1,72 @@
+{
+    "name": "@signpdf/utils",
+    "version": "3.0.0",
+    "description": "Utilities for the @signpdf packages.",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/vbuch/node-signpdf"
+    },
+    "license": "MIT",
+    "keywords": [
+        "sign",
+        "pdf",
+        "node",
+        "nodejs",
+        "esign",
+        "adobe",
+        "ppklite",
+        "sign detached",
+        "pkcs7",
+        "pkcs#7",
+        "pades",
+        "digital signature"
+    ],
+    "main": "dist/signpdf.js",
+    "files": [
+        "dist",
+        "LICENSE",
+        "README.md"
+    ],
+    "engines": {
+        "node": ">=12"
+    },
+    "scripts": {
+        "test:coverage": "./node_modules/.bin/jest --coverage",
+        "test": "./node_modules/.bin/jest",
+        "test:watch": "./node_modules/.bin/jest --watch",
+        "build": "rm -rf ./dist/* & ./node_modules/.bin/babel ./src -d ./dist --ignore \"**/*.test.js\" & tsc",
+        "build:watch": "./node_modules/.bin/babel --watch ./src -d ./dist --ignore \"**/*.test.js\"",
+        "lint": "./node_modules/.bin/eslint -c .eslintrc --ignore-path .eslintignore ./",
+        "prepare": "husky install"
+    },
+    "peerDependencies": {
+        "node-forge": "^1.2.1"
+    },
+    "devDependencies": {
+        "@signpdf/signpdf": "workspace:^",
+        "@signpdf/placeholder-pdfkit10": "workspace:^",
+        
+        "@babel/cli": "^7.0.0",
+        "@babel/core": "^7.4.0",
+        "@babel/eslint-parser": "^7.16.3",
+        "@babel/node": "^7.0.0",
+        "@babel/plugin-syntax-object-rest-spread": "^7.0.0",
+        "@babel/preset-env": "^7.4.2",
+        "@types/node": ">=12.0.0",
+        "@types/node-forge": "^1.2.1",
+        "assertion-error": "^1.1.0",
+        "babel-jest": "^27.3.1",
+        "babel-plugin-module-resolver": "^3.1.1",
+        "coveralls": "^3.0.2",
+        "eslint": "^8.2.0",
+        "eslint-config-airbnb-base": "^15.0.0",
+        "eslint-import-resolver-babel-module": "^5.3.1",
+        "eslint-plugin-import": "^2.25.3",
+        "eslint-plugin-jest": "^25.2.4",
+        "husky": "^7.0.4",
+        "jest": "^27.3.1",
+        "node-forge": "^1.2.1",
+        "pdfkit": "^0.10.0",
+        "typescript": "^5.2.2"
+    }
+}
diff --git a/packages/utils/src/SignPdfError.js b/packages/utils/src/SignPdfError.js
new file mode 100644
index 00000000..0312c1b0
--- /dev/null
+++ b/packages/utils/src/SignPdfError.js
@@ -0,0 +1,19 @@
+export const ERROR_TYPE_UNKNOWN = 1;
+export const ERROR_TYPE_INPUT = 2;
+export const ERROR_TYPE_PARSE = 3;
+export const ERROR_VERIFY_SIGNATURE = 4;
+
+class SignPdfError extends Error {
+    constructor(msg, type = ERROR_TYPE_UNKNOWN) {
+        super(msg);
+        this.type = type;
+    }
+}
+
+// Shorthand
+SignPdfError.TYPE_UNKNOWN = ERROR_TYPE_UNKNOWN;
+SignPdfError.TYPE_INPUT = ERROR_TYPE_INPUT;
+SignPdfError.TYPE_PARSE = ERROR_TYPE_PARSE;
+SignPdfError.VERIFY_SIGNATURE = ERROR_VERIFY_SIGNATURE;
+
+export default SignPdfError;
diff --git a/packages/utils/src/SignPdfError.test.js b/packages/utils/src/SignPdfError.test.js
new file mode 100644
index 00000000..93cca72a
--- /dev/null
+++ b/packages/utils/src/SignPdfError.test.js
@@ -0,0 +1,26 @@
+import SignPdfError, {
+    ERROR_TYPE_UNKNOWN,
+    ERROR_TYPE_INPUT,
+    ERROR_TYPE_PARSE,
+} from './SignPdfError';
+
+describe('SignPdfError', () => {
+    it('SignPdfError extends Error', () => {
+        const instance = new SignPdfError('Whatever message');
+        expect(instance instanceof Error).toBe(true);
+    });
+    it('type defaults to UNKNOWN', () => {
+        const instance = new SignPdfError('Whatever message');
+        expect(instance.type).toBe(ERROR_TYPE_UNKNOWN);
+    });
+    it('type can be specified', () => {
+        [
+            ERROR_TYPE_UNKNOWN,
+            ERROR_TYPE_INPUT,
+            ERROR_TYPE_PARSE,
+        ].forEach((type) => {
+            const instance = new SignPdfError('Whatever message', type);
+            expect(instance.type).toBe(type);
+        });
+    });
+});