diff --git a/src/index.js b/src/index.js
index 98e2d7c4..cecf3afe 100644
--- a/src/index.js
+++ b/src/index.js
@@ -90,7 +90,7 @@ class Poppler {
 	 * @param {String} outputFile - Filepath of the file to output the results to.
 	 * @returns {Promise}
 	 */
-	pdfAttach(options, file, fileToAttach, outputFile) {
+	pdfAttach(options = {}, file, fileToAttach, outputFile) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				printVersionInfo: { arg: '-v', type: 'boolean' },
@@ -104,11 +104,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			args.push(fileToAttach);
@@ -152,7 +150,7 @@ class Poppler {
 	 * @param {String} file - Filepath of the PDF file to read.
 	 * @returns {Promise}
 	 */
-	pdfDetach(options, file) {
+	pdfDetach(options = {}, file) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				listEmbedded: { arg: '-list', type: 'boolean' },
@@ -172,11 +170,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 
@@ -209,7 +205,7 @@ class Poppler {
 	 * @param {String} file - Filepath of the PDF file to read.
 	 * @returns {Promise}
 	 */
-	pdfFonts(options, file) {
+	pdfFonts(options = {}, file) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				firstPageToExamine: { arg: '-f', type: 'number' },
@@ -227,11 +223,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 
@@ -273,7 +267,7 @@ class Poppler {
 	 * @param {String} file - Filepath of the PDF file to read.
 	 * @param {String} outputPrefix - Filename prefix of output files.
 	 */
-	pdfImages(options, file, outputPrefix) {
+	pdfImages(options = {}, file, outputPrefix) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				allFiles: { arg: '-all', type: 'boolean' },
@@ -298,11 +292,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			if (outputPrefix) {
@@ -355,7 +347,7 @@ class Poppler {
 	 * @param {String} file - Filepath of the PDF file to read.
 	 * @returns {Promise}
 	 */
-	pdfInfo(options, file) {
+	pdfInfo(options = {}, file) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				firstPageToConvert: { arg: '-f', type: 'number' },
@@ -382,11 +374,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 
@@ -422,7 +412,7 @@ class Poppler {
 	 * As an example, 'sample-%d.pdf' will produce 'sample-1.pdf' for a single page document.
 	 * @returns {Promise}
 	 */
-	pdfSeparate(options, file, outputPattern) {
+	pdfSeparate(options = {}, file, outputPattern) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				firstPageToExtract: { arg: '-f', type: 'number' },
@@ -437,11 +427,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			args.push(outputPattern);
@@ -548,7 +536,7 @@ class Poppler {
 	 * @param {String=} outputFile - Filepath of the file to output the results to.
 	 * @returns {Promise}
 	 */
-	pdfToCairo(options, file, outputFile) {
+	pdfToCairo(options = {}, file, outputFile) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				antialias: { arg: '-antialias', type: 'string' },
@@ -605,11 +593,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			if (outputFile) {
@@ -667,7 +653,7 @@ class Poppler {
 	 * @param {String} file - Filepath of the PDF file to read.
 	 * @returns {Promise}
 	 */
-	pdfToHtml(options, file) {
+	pdfToHtml(options = {}, file) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				complexOutput: { arg: '-c', type: 'boolean' },
@@ -701,11 +687,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 
@@ -784,7 +768,7 @@ class Poppler {
 	 * @param {String} outputPath - Filepath to output the results to.
 	 * @returns {Promise}
 	 */
-	pdfToPpm(options, file, outputPath) {
+	pdfToPpm(options = {}, file, outputPath) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				antialiasFonts: { arg: '-aa', type: 'string' },
@@ -827,11 +811,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			args.push(outputPath);
@@ -939,7 +921,7 @@ class Poppler {
 	 * @param {String} outputFile - Filepath of the file to output the results to.
 	 * @returns {Promise}
 	 */
-	pdfToPs(options, file, outputFile) {
+	pdfToPs(options = {}, file, outputFile) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				antialias: { arg: '-aaRaster', type: 'string' },
@@ -992,11 +974,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			args.push(outputFile);
@@ -1059,7 +1039,7 @@ class Poppler {
 	 * @param {String=} outputFile - Filepath of the file to output the results to.
 	 * @returns {Promise}
 	 */
-	pdfToText(options, file, outputFile) {
+	pdfToText(options = {}, file, outputFile) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				boundingBoxXhtml: { arg: '-bbox', type: 'boolean' },
@@ -1096,11 +1076,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			args.push(file);
 			if (outputFile) {
@@ -1133,7 +1111,7 @@ class Poppler {
 	 * @param {String=} outputFile - Filepath of the file to output the resulting merged PDF to.
 	 * @returns {Promise}
 	 */
-	pdfUnite(options, files, outputFile) {
+	pdfUnite(options = {}, files, outputFile) {
 		return new Promise((resolve, reject) => {
 			const acceptedOptions = {
 				printVersionInfo: { arg: '-v', type: 'boolean' }
@@ -1146,11 +1124,9 @@ class Poppler {
 			 * Check each option provided is valid and of the correct type,
 			 * before adding it to argument list.
 			 */
-			if (options) {
-				parseOptions(options, acceptedOptions, args).catch((err) => {
-					reject(err);
-				});
-			}
+			parseOptions(options, acceptedOptions, args).catch((err) => {
+				reject(err);
+			});
 
 			files.forEach((element) => {
 				args.push(element);