diff --git a/src/converters/assimp.ts b/src/converters/assimp.ts
index 869f28e..08223ea 100644
--- a/src/converters/assimp.ts
+++ b/src/converters/assimp.ts
@@ -121,7 +121,7 @@ export async function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("assimp", ["export", filePath, targetPath], (error, stdout, stderr) => {
+    execFile("assimp", ["export", filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/calibre.ts b/src/converters/calibre.ts
index 153de16..bf63a27 100644
--- a/src/converters/calibre.ts
+++ b/src/converters/calibre.ts
@@ -67,7 +67,7 @@ export async function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("ebook-convert", [filePath, targetPath], (error, stdout, stderr) => {
+    execFile("ebook-convert", [filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/dvisvgm.ts b/src/converters/dvisvgm.ts
index 76ef5c1..e7e422f 100644
--- a/src/converters/dvisvgm.ts
+++ b/src/converters/dvisvgm.ts
@@ -30,20 +30,25 @@ export function convert(
   }
 
   return new Promise((resolve, reject) => {
-    execFile("dvisvgm", [...inputArgs, filePath, "-o", targetPath], (error, stdout, stderr) => {
-      if (error) {
-        reject(`error: ${error}`);
-      }
+    execFile(
+      "dvisvgm",
+      [...inputArgs, filePath, "-o", targetPath],
+      options,
+      (error, stdout, stderr) => {
+        if (error) {
+          reject(`error: ${error}`);
+        }
 
-      if (stdout) {
-        console.log(`stdout: ${stdout}`);
-      }
+        if (stdout) {
+          console.log(`stdout: ${stdout}`);
+        }
 
-      if (stderr) {
-        console.error(`stderr: ${stderr}`);
-      }
+        if (stderr) {
+          console.error(`stderr: ${stderr}`);
+        }
 
-      resolve("Done");
-    });
+        resolve("Done");
+      },
+    );
   });
 }
diff --git a/src/converters/ffmpeg.ts b/src/converters/ffmpeg.ts
index 8207c61..3e0cab7 100644
--- a/src/converters/ffmpeg.ts
+++ b/src/converters/ffmpeg.ts
@@ -735,6 +735,7 @@ export async function convert(
     execFile(
       "ffmpeg",
       [...ffmpegArgs, "-i", filePath, ...extraArgs, targetPath],
+      options,
       (error, stdout, stderr) => {
         if (error) {
           reject(`error: ${error}`);
diff --git a/src/converters/graphicsmagick.ts b/src/converters/graphicsmagick.ts
index 5551341..7d234e7 100644
--- a/src/converters/graphicsmagick.ts
+++ b/src/converters/graphicsmagick.ts
@@ -318,7 +318,7 @@ export function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("gm", ["convert", filePath, targetPath], (error, stdout, stderr) => {
+    execFile("gm", ["convert", filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/imagemagick.ts b/src/converters/imagemagick.ts
index eb2eaa7..28b1ef5 100644
--- a/src/converters/imagemagick.ts
+++ b/src/converters/imagemagick.ts
@@ -472,6 +472,7 @@ export function convert(
     execFile(
       "magick",
       [...inputArgs, filePath, ...outputArgs, targetPath],
+      options,
       (error, stdout, stderr) => {
         if (error) {
           reject(`error: ${error}`);
diff --git a/src/converters/inkscape.ts b/src/converters/inkscape.ts
index 4497e2f..4d277bd 100644
--- a/src/converters/inkscape.ts
+++ b/src/converters/inkscape.ts
@@ -37,7 +37,7 @@ export function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("inkscape", [filePath, "-o", targetPath], (error, stdout, stderr) => {
+    execFile("inkscape", [filePath, "-o", targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/libheif.ts b/src/converters/libheif.ts
index b88e177..6326662 100644
--- a/src/converters/libheif.ts
+++ b/src/converters/libheif.ts
@@ -19,7 +19,7 @@ export function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("heif-convert", [filePath, targetPath], (error, stdout, stderr) => {
+    execFile("heif-convert", [filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/libjxl.ts b/src/converters/libjxl.ts
index 6ff825f..cd7f315 100644
--- a/src/converters/libjxl.ts
+++ b/src/converters/libjxl.ts
@@ -31,7 +31,7 @@ export function convert(
   }
 
   return new Promise((resolve, reject) => {
-    execFile(tool, [filePath, targetPath], (error, stdout, stderr) => {
+    execFile(tool, [filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/libreoffice.ts b/src/converters/libreoffice.ts
index d5c47af..7489a91 100644
--- a/src/converters/libreoffice.ts
+++ b/src/converters/libreoffice.ts
@@ -1,4 +1,5 @@
-import { execFile } from "node:child_process";
+import { execFile as execFileOriginal } from "node:child_process";
+import { ExecFileFn } from "./types.ts";
 
 export const properties = {
   from: {
@@ -136,8 +137,8 @@ export function convert(
   fileType: string,
   convertTo: string,
   targetPath: string,
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
   options?: unknown,
+  execFile: ExecFileFn = execFileOriginal,
 ): Promise<string> {
   const outputPath = targetPath.split("/").slice(0, -1).join("/").replace("./", "") ?? targetPath;
 
@@ -157,7 +158,7 @@ export function convert(
   }
 
   return new Promise((resolve, reject) => {
-    execFile("soffice", args, (error, stdout, stderr) => {
+    execFile("soffice", args, options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/pandoc.ts b/src/converters/pandoc.ts
index 6aab79d..3873454 100644
--- a/src/converters/pandoc.ts
+++ b/src/converters/pandoc.ts
@@ -1,4 +1,5 @@
-import { execFile } from "node:child_process";
+import { execFile as execFileOriginal } from "node:child_process";
+import { ExecFileFn } from "./types.ts";
 
 export const properties = {
   from: {
@@ -124,8 +125,8 @@ export function convert(
   fileType: string,
   convertTo: string,
   targetPath: string,
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
   options?: unknown,
+  execFile: ExecFileFn = execFileOriginal,
 ): Promise<string> {
   // set xelatex here
   const xelatex = ["pdf", "latex"];
@@ -143,7 +144,7 @@ export function convert(
   args.push("-o", targetPath);
 
   return new Promise((resolve, reject) => {
-    execFile("pandoc", args, (error, stdout, stderr) => {
+    execFile("pandoc", args, options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/potrace.ts b/src/converters/potrace.ts
index 6027491..767fee0 100644
--- a/src/converters/potrace.ts
+++ b/src/converters/potrace.ts
@@ -31,20 +31,25 @@ export function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("potrace", [filePath, "-o", targetPath, "-b", convertTo], (error, stdout, stderr) => {
-      if (error) {
-        reject(`error: ${error}`);
-      }
+    execFile(
+      "potrace",
+      [filePath, "-o", targetPath, "-b", convertTo],
+      options,
+      (error, stdout, stderr) => {
+        if (error) {
+          reject(`error: ${error}`);
+        }
 
-      if (stdout) {
-        console.log(`stdout: ${stdout}`);
-      }
+        if (stdout) {
+          console.log(`stdout: ${stdout}`);
+        }
 
-      if (stderr) {
-        console.error(`stderr: ${stderr}`);
-      }
+        if (stderr) {
+          console.error(`stderr: ${stderr}`);
+        }
 
-      resolve("Done");
-    });
+        resolve("Done");
+      },
+    );
   });
 }
diff --git a/src/converters/resvg.ts b/src/converters/resvg.ts
index 3155483..97062cc 100644
--- a/src/converters/resvg.ts
+++ b/src/converters/resvg.ts
@@ -19,7 +19,7 @@ export function convert(
   execFile: ExecFileFn = execFileOriginal, // to make it mockable
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("resvg", [filePath, targetPath], (error, stdout, stderr) => {
+    execFile("resvg", [filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/types.ts b/src/converters/types.ts
index 5227b37..0f265b6 100644
--- a/src/converters/types.ts
+++ b/src/converters/types.ts
@@ -1,7 +1,7 @@
 export type ExecFileFn = (
   cmd: string,
   args: string[],
-  options: import("child_process").ExecFileOptions | undefined,
+  options: import("child_process").ExecFileOptions | unknown | undefined | null,
   callback: (err: Error | null, stdout: string, stderr: string) => void,
 ) => void;
 
diff --git a/src/converters/vips.ts b/src/converters/vips.ts
index b89db12..ddab269 100644
--- a/src/converters/vips.ts
+++ b/src/converters/vips.ts
@@ -120,7 +120,7 @@ export function convert(
   }
 
   return new Promise((resolve, reject) => {
-    execFile("vips", [action, filePath, targetPath], (error, stdout, stderr) => {
+    execFile("vips", [action, filePath, targetPath], options, (error, stdout, stderr) => {
       if (error) {
         reject(`error: ${error}`);
       }
diff --git a/src/converters/xelatex.ts b/src/converters/xelatex.ts
index 784acdc..a940fdf 100644
--- a/src/converters/xelatex.ts
+++ b/src/converters/xelatex.ts
@@ -25,6 +25,7 @@ export function convert(
     execFile(
       "latexmk",
       ["-xelatex", "-interaction=nonstopmode", `-output-directory=${outputPath}`, filePath],
+      options,
       (error, stdout, stderr) => {
         if (error) {
           reject(`error: ${error}`);
diff --git a/tests/converters/dvisvgm.test.ts b/tests/converters/dvisvgm.test.ts
index 873b4db..2c91a2f 100644
--- a/tests/converters/dvisvgm.test.ts
+++ b/tests/converters/dvisvgm.test.ts
@@ -37,6 +37,7 @@ test("convert respects eps filetype", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
@@ -63,6 +64,7 @@ test("convert respects pdf filetype", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
@@ -89,6 +91,7 @@ test("convert respects svgz conversion target type", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
diff --git a/tests/converters/ffmpeg.test.ts b/tests/converters/ffmpeg.test.ts
index 2bb375a..4cea0ea 100644
--- a/tests/converters/ffmpeg.test.ts
+++ b/tests/converters/ffmpeg.test.ts
@@ -6,6 +6,7 @@ let calls: string[][] = [];
 function mockExecFile(
   _cmd: string,
   args: string[],
+  options: unknown,
   callback: (err: Error | null, stdout: string, stderr: string) => void,
 ) {
   calls.push(args);
diff --git a/tests/converters/helpers/converters.ts b/tests/converters/helpers/converters.ts
index fe04d7e..950c873 100644
--- a/tests/converters/helpers/converters.ts
+++ b/tests/converters/helpers/converters.ts
@@ -13,6 +13,7 @@ export async function runConvertSuccessTest(convertFn: ConvertFnWithExecFile) {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     callback(null, "Fake stdout", "");
@@ -30,6 +31,7 @@ export async function runConvertFailTest(convertFn: ConvertFnWithExecFile) {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     callback(new Error("Test error"), "", "");
@@ -51,9 +53,10 @@ export async function runConvertLogsStderror(convertFn: ConvertFnWithExecFile) {
   const mockExecFile = (
     _cmd: string,
     _args: string[],
-    cb: (err: Error | null, stdout: string, stderr: string) => void,
+    options: unknown,
+    callback: (err: Error | null, stdout: string, stderr: string) => void,
   ) => {
-    cb(null, "", "Fake stderr");
+    callback(null, "", "Fake stderr");
   };
 
   await convertFn("file.obj", "obj", "stl", "out.stl", undefined, mockExecFile);
diff --git a/tests/converters/imagemagick.test.ts b/tests/converters/imagemagick.test.ts
index 26ec4a9..06f1d13 100644
--- a/tests/converters/imagemagick.test.ts
+++ b/tests/converters/imagemagick.test.ts
@@ -37,6 +37,7 @@ test("convert respects ico conversion target type", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
@@ -72,6 +73,7 @@ test("convert respects ico conversion target type with svg as input filetype", a
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
@@ -109,6 +111,7 @@ test("convert respects ico conversion target type with emf as input filetype", a
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
@@ -150,6 +153,7 @@ test("convert respects emf as input filetype", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
diff --git a/tests/converters/libjxl.test.ts b/tests/converters/libjxl.test.ts
index cea851b..ed352d6 100644
--- a/tests/converters/libjxl.test.ts
+++ b/tests/converters/libjxl.test.ts
@@ -37,6 +37,7 @@ test("convert uses djxl with input filetype being jxl", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     command = _cmd;
@@ -63,6 +64,7 @@ test("convert uses cjxl with output filetype being jxl", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     command = _cmd;
diff --git a/tests/converters/vips.test.ts b/tests/converters/vips.test.ts
index dec12dd..d7ea9d8 100644
--- a/tests/converters/vips.test.ts
+++ b/tests/converters/vips.test.ts
@@ -37,6 +37,7 @@ test("convert uses action pdfload with filetype being pdf", async () => {
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);
@@ -63,6 +64,7 @@ test("convert uses action copy with filetype being anything but pdf", async () =
   const mockExecFile: ExecFileFn = (
     _cmd: string,
     _args: string[],
+    options: unknown,
     callback: (err: ExecFileException | null, stdout: string, stderr: string) => void,
   ) => {
     calls.push(_args);