diff --git a/src/browser/defaultOptions.js b/src/browser/defaultOptions.js
index 491a8a8..ed51481 100644
--- a/src/browser/defaultOptions.js
+++ b/src/browser/defaultOptions.js
@@ -1,4 +1,3 @@
-const resolveURL = require('resolve-url');
 const { devDependencies } = require('../../package.json');
 
 /*
@@ -6,6 +5,6 @@ const { devDependencies } = require('../../package.json');
  */
 module.exports = {
   corePath: typeof process !== 'undefined' && process.env.NODE_ENV === 'development'
-    ? resolveURL('/node_modules/@ffmpeg/core/dist/ffmpeg-core.js')
+    ? new URL('/node_modules/@ffmpeg/core/dist/ffmpeg-core.js', import.meta.url).href
     : `https://unpkg.com/@ffmpeg/core@${devDependencies['@ffmpeg/core'].substring(1)}/dist/ffmpeg-core.js`,
 };
diff --git a/src/browser/fetchFile.js b/src/browser/fetchFile.js
index 74dcb7d..f977c6c 100644
--- a/src/browser/fetchFile.js
+++ b/src/browser/fetchFile.js
@@ -1,5 +1,3 @@
-const resolveURL = require('resolve-url');
-
 const readFromBlobOrFile = (blob) => (
   new Promise((resolve, reject) => {
     const fileReader = new FileReader();
@@ -27,7 +25,7 @@ module.exports = async (_data) => {
         .map((c) => c.charCodeAt(0));
     /* From remote server/URL */
     } else {
-      const res = await fetch(resolveURL(_data));
+      const res = await fetch(new URL(_data, import.meta.url).href);
       data = await res.arrayBuffer();
     }
   /* From Blob or File */
diff --git a/src/browser/getCreateFFmpegCore.js b/src/browser/getCreateFFmpegCore.js
index f31167e..762bc0d 100644
--- a/src/browser/getCreateFFmpegCore.js
+++ b/src/browser/getCreateFFmpegCore.js
@@ -1,5 +1,4 @@
 /* eslint-disable no-undef */
-const resolveURL = require('resolve-url');
 const { log } = require('../utils/log');
 const {
   CREATE_FFMPEG_CORE_IS_NOT_DEFINED,
@@ -19,31 +18,31 @@ const toBlobURL = async (url, mimeType) => {
   return blobURL;
 };
 
-module.exports = async ({ corePath: _corePath }) => {
-  if (typeof _corePath !== 'string') {
-    throw Error('corePath should be a string!');
-  }
-  const coreRemotePath = resolveURL(_corePath);
-  const corePath = await toBlobURL(
-    coreRemotePath,
-    'application/javascript',
-  );
-  const wasmPath = await toBlobURL(
-    coreRemotePath.replace('ffmpeg-core.js', 'ffmpeg-core.wasm'),
-    'application/wasm',
-  );
-  const workerPath = await toBlobURL(
-    coreRemotePath.replace('ffmpeg-core.js', 'ffmpeg-core.worker.js'),
-    'application/javascript',
-  );
-  if (typeof createFFmpegCore === 'undefined') {
-    return new Promise((resolve) => {
-      const script = document.createElement('script');
-      const eventHandler = () => {
-        script.removeEventListener('load', eventHandler);
+if (typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope) {
+  // in Web Worker context
+  module.exports = async ({ corePath: _corePath }) => {
+    if (typeof _corePath !== 'string') {
+      throw Error('corePath should be a string!');
+    }
+    const coreRemotePath = new URL(_corePath, import.meta.url).href;
+    const corePath = await toBlobURL(
+      coreRemotePath,
+      'application/javascript',
+    );
+    const wasmPath = await toBlobURL(
+      coreRemotePath.replace('ffmpeg-core.js', 'ffmpeg-core.wasm'),
+      'application/wasm',
+    );
+    const workerPath = await toBlobURL(
+      coreRemotePath.replace('ffmpeg-core.js', 'ffmpeg-core.worker.js'),
+      'application/javascript',
+    );
+    if (typeof createFFmpegCore === 'undefined') {
+      return new Promise((resolve) => {
         if (typeof createFFmpegCore === 'undefined') {
           throw Error(CREATE_FFMPEG_CORE_IS_NOT_DEFINED(coreRemotePath));
         }
+        importScripts(corePath);
         log('info', 'ffmpeg-core.js script loaded');
         resolve({
           createFFmpegCore,
@@ -51,18 +50,63 @@ module.exports = async ({ corePath: _corePath }) => {
           wasmPath,
           workerPath,
         });
-      };
-      script.src = corePath;
-      script.type = 'text/javascript';
-      script.addEventListener('load', eventHandler);
-      document.getElementsByTagName('head')[0].appendChild(script);
+      });
+    }
+    log('info', 'ffmpeg-core.js script is loaded already');
+    return Promise.resolve({
+      createFFmpegCore,
+      corePath,
+      wasmPath,
+      workerPath,
     });
-  }
-  log('info', 'ffmpeg-core.js script is loaded already');
-  return Promise.resolve({
-    createFFmpegCore,
-    corePath,
-    wasmPath,
-    workerPath,
-  });
-};
+  };
+} else {
+  module.exports = async ({ corePath: _corePath }) => {
+    if (typeof _corePath !== 'string') {
+      throw Error('corePath should be a string!');
+    }
+    const coreRemotePath = new URL(_corePath, import.meta.url).href;
+    const corePath = await toBlobURL(
+      coreRemotePath,
+      'application/javascript',
+    );
+    const wasmPath = await toBlobURL(
+      coreRemotePath.replace('ffmpeg-core.js', 'ffmpeg-core.wasm'),
+      'application/wasm',
+    );
+    const workerPath = await toBlobURL(
+      coreRemotePath.replace('ffmpeg-core.js', 'ffmpeg-core.worker.js'),
+      'application/javascript',
+    );
+    if (typeof createFFmpegCore === 'undefined') {
+      return new Promise((resolve) => {
+        const script = document.createElement('script');
+        const eventHandler = () => {
+          script.removeEventListener('load', eventHandler);
+          if (typeof createFFmpegCore === 'undefined') {
+            throw Error(CREATE_FFMPEG_CORE_IS_NOT_DEFINED(coreRemotePath));
+          }
+          log('info', 'ffmpeg-core.js script loaded');
+          resolve({
+            createFFmpegCore,
+            corePath,
+            wasmPath,
+            workerPath,
+          });
+        };
+        script.src = corePath;
+        script.type = 'text/javascript';
+        script.addEventListener('load', eventHandler);
+        document.getElementsByTagName('head')[0].appendChild(script);
+      });
+    }
+    log('info', 'ffmpeg-core.js script is loaded already');
+    return Promise.resolve({
+      createFFmpegCore,
+      corePath,
+      wasmPath,
+      workerPath,
+    });
+  };
+}
+