diff --git a/src/arraybuffers/arraybuffers.spec.ts b/src/arraybuffers/arraybuffers.spec.ts
index f4bf557..c4a18d0 100644
--- a/src/arraybuffers/arraybuffers.spec.ts
+++ b/src/arraybuffers/arraybuffers.spec.ts
@@ -12,11 +12,6 @@ var array2 = uint8Array2.buffer;
 var string2 = '\x00\x02\x81\x80\x00\x01\x00\x05\x00';
 var hexString2 = '0.2.81.80.0.1.0.5.0';
 
-var uint8Array3 = new Uint8Array(
-    [0xE5, 0xA4, 0xA7, 0xE7, 0xBA, 0xAA, 0xE5, 0x85, 0x83]);
-var array3 = uint8Array3.buffer;
-var string3 = '大纪元';
-
 var uint8Array12 = new Uint8Array(
     [12,118,101,114,105,115,0,2,129,128,0,1,0,5,0]);
 var array12 = uint8Array12.buffer;
@@ -142,36 +137,3 @@ describe('ArrayBuffers <-> strings', function() {
         .not.toEqual(string2);
   });
 });
-
-describe('ArrayBuffers(UTF8) <-> strings', function() {
-  it('Empty Buffer -> Empty String', function() {
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(emptyArray)).toEqual(emptyString);
-  });
-  it('Empty String -> Empty Buffer', function() {
-    expect(arraybuffers.stringToUtf8EncodedArrayBuffer(emptyString).byteLength).toEqual(0);
-  });
-
-  it('Buffer(UTF8) -> String', function() {
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(emptyArray)).toEqual(emptyString);
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(array1)).toEqual(string1);
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(array3)).toEqual(string3);
-  });
-
-  it('String -> Buffer(UTF8)', function() {
-    expect(arraybuffers.byteEquality(
-        arraybuffers.stringToUtf8EncodedArrayBuffer(emptyString), emptyArray)).toBe(true);
-    expect(arraybuffers.byteEquality(
-        arraybuffers.stringToUtf8EncodedArrayBuffer(string1), array1)).toBe(true);
-    expect(arraybuffers.byteEquality(
-        arraybuffers.stringToUtf8EncodedArrayBuffer(string3), array3)).toBe(true);
-  });
-
-  it('String -> Buffer(UTF8) -> String = identity', function() {
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(
-        arraybuffers.stringToUtf8EncodedArrayBuffer(emptyString))).toEqual(emptyString);
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(
-        arraybuffers.stringToUtf8EncodedArrayBuffer(string1))).toEqual(string1);
-    expect(arraybuffers.arrayBufferDecodedAsUtf8String(
-        arraybuffers.stringToUtf8EncodedArrayBuffer(string3))).toEqual(string3);
-  });
-});
diff --git a/src/arraybuffers/arraybuffers.ts b/src/arraybuffers/arraybuffers.ts
index 9e08aa7..b3e11c5 100644
--- a/src/arraybuffers/arraybuffers.ts
+++ b/src/arraybuffers/arraybuffers.ts
@@ -70,10 +70,6 @@ export function stringToArrayBuffer(s:string) :ArrayBuffer {
   return buffer;
 }
 
-// Escape and unescape are actually globally defined functions.
-declare function escape(s:string):string;
-declare function unescape(s:string):string;
-
 // Converts an ArrayBuffer to a string of hex codes (of the regexp form
 // /(hh\.)*hh/).
 export function arrayBufferToHexString(buffer:ArrayBuffer) :string {
@@ -98,29 +94,6 @@ export function hexStringToArrayBuffer(hexString:string) :ArrayBuffer {
   return buffer;
 }
 
-// Converts arrayBuffer which has a string encoded in UTF8 to a
-// Javascript string.
-//
-// Note: the array buffer should have a valid string with no zero inside.
-export function arrayBufferDecodedAsUtf8String(buffer:ArrayBuffer) :string {
-  var bytes = new Uint8Array(buffer);
-  var a :string[] = [];
-  for (var i = 0; i < bytes.length; ++i) {
-    a.push(String.fromCharCode(bytes[i]));
-  }
-  return decodeURIComponent(escape(a.join('')));
-}
-
-// Converts javascript string to array buffer using UTF8 encoding.
-export function stringToUtf8EncodedArrayBuffer(str:string) :ArrayBuffer {
-  var strUtf8 = unescape(encodeURIComponent(str));
-  var ab = new Uint8Array(strUtf8.length);
-  for (var i = 0; i < strUtf8.length; i++) {
-      ab[i] = strUtf8.charCodeAt(i);
-  }
-  return ab.buffer;
-}
-
 // Returns an ArrayBuffer backed by the same memory as the supplied
 // Node.js Buffer.
 export function bufferToArrayBuffer(buffer: Buffer): ArrayBuffer {