diff --git a/src/fonts.js b/src/fonts.js
index 66c3be0f6..96452ab08 100644
--- a/src/fonts.js
+++ b/src/fonts.js
@@ -390,7 +390,7 @@ var symbolsFonts = {
   'Dingbats': true, 'Symbol': true, 'ZapfDingbats': true
 };
 
-// Some characters, e.g. copyrightserif, mapped to the privateData use area and
+// Some characters, e.g. copyrightserif, mapped to the private use area and
 // might not be displayed using standard fonts. Mapping/hacking well-known chars
 // to the similar equivalents in the normal characters range.
 function mapPrivateUseChars(code) {
@@ -1216,7 +1216,7 @@ var Font = (function FontClosure() {
       'Unknown'            // 9.Designer
     ];
 
-    // Mac want 1-octet per character strings while Windows want
+    // Mac want 1-byte per character strings while Windows want
     // 2-bytes per character, so duplicate the names table
     var stringsUnicode = [];
     for (var i = 0, ii = strings.length; i < ii; i++) {
@@ -1970,7 +1970,7 @@ var Font = (function FontClosure() {
             minUnicode = Math.min(minUnicode, unicode);
             maxUnicode = Math.max(maxUnicode, unicode);
           }
-          // high octet must be the same for min and max unicodes
+          // high byte must be the same for min and max unicodes
           if ((maxUnicode & 0xFF00) != (minUnicode & 0xFF00))
             this.isSymbolicFont = false;
         }
@@ -1986,7 +1986,7 @@ var Font = (function FontClosure() {
         if (hasShortCmap && this.hasEncoding && !this.isSymbolicFont) {
           // Re-encode short map encoding to unicode -- that simplifies the
           // resolution of MacRoman encoded glyphs logic for TrueType fonts:
-          // copying all characters to privateData use area, all mapping all known
+          // copying all characters to private use area, all mapping all known
           // glyphs to the unicodes. The glyphs and ids arrays will grow.
           var usedUnicodes = [];
           for (var i = 0, ii = glyphs.length; i < ii; i++) {
@@ -2114,7 +2114,7 @@ var Font = (function FontClosure() {
         var tableData = table.data;
         ttf.file += arrayToString(tableData);
 
-        // 4-octet aligned data
+        // 4-byte aligned data
         while (ttf.file.length & 3)
           ttf.file += String.fromCharCode(0);
       }
@@ -2504,12 +2504,12 @@ var Font = (function FontClosure() {
       glyphs = [];
 
       if (this.composite) {
-        // composite fonts have multi-octet strings convert the string from
-        // single-octet to multi-octet
-        // XXX assuming CIDFonts are two-octet - later need to extract the
-        // correct octet encoding according to the PDF spec
+        // composite fonts have multi-byte strings convert the string from
+        // single-byte to multi-byte
+        // XXX assuming CIDFonts are two-byte - later need to extract the
+        // correct byte encoding according to the PDF spec
         var length = chars.length - 1; // looping over two bytes at a time so
-                                       // loop should never end on the last octet
+                                       // loop should never end on the last byte
         for (var i = 0; i < length; i++) {
           var charcode = int16([chars.charCodeAt(i++), chars.charCodeAt(i)]);
           var glyph = this.charToGlyph(charcode);
@@ -2568,37 +2568,37 @@ var Type1Parser = function type1Parser() {
   /*
    * CharStrings are encoded following the the CharString Encoding sequence
    * describe in Chapter 6 of the "Adobe Type1 Font Format" specification.
-   * The value in a octet indicates a command, a number, or subsequent bytes
+   * The value in a byte indicates a command, a number, or subsequent bytes
    * that are to be interpreted in a special way.
    *
    * CharString Number Encoding:
-   *  A CharString octet containing the values from 32 through 255 inclusive
+   *  A CharString byte containing the values from 32 through 255 inclusive
    *  indicate an integer. These values are decoded in four ranges.
    *
-   * 1. A CharString octet containing a value, v, between 32 and 246 inclusive,
+   * 1. A CharString byte containing a value, v, between 32 and 246 inclusive,
    * indicate the integer v - 139. Thus, the integer values from -107 through
-   * 107 inclusive may be encoded in single octet.
+   * 107 inclusive may be encoded in single byte.
    *
-   * 2. A CharString octet containing a value, v, between 247 and 250 inclusive,
-   * indicates an integer involving the next octet, w, according to the formula:
+   * 2. A CharString byte containing a value, v, between 247 and 250 inclusive,
+   * indicates an integer involving the next byte, w, according to the formula:
    * [(v - 247) x 256] + w + 108
    *
-   * 3. A CharString octet containing a value, v, between 251 and 254 inclusive,
-   * indicates an integer involving the next octet, w, according to the formula:
+   * 3. A CharString byte containing a value, v, between 251 and 254 inclusive,
+   * indicates an integer involving the next byte, w, according to the formula:
    * -[(v - 251) * 256] - w - 108
    *
    * 4. A CharString containing the value 255 indicates that the next 4 bytes
    * are a two complement signed integer. The first of these bytes contains the
-   * highest order bits, the second octet contains the next higher order bits
-   * and the fourth octet contain the lowest order bits.
+   * highest order bits, the second byte contains the next higher order bits
+   * and the fourth byte contain the lowest order bits.
    *
    *
    * CharString Command Encoding:
    *  CharStrings commands are encoded in 1 or 2 bytes.
    *
-   *  Single octet commands are encoded in 1 octet that contains a value between
+   *  Single byte commands are encoded in 1 byte that contains a value between
    *  0 and 31 inclusive.
-   *  If a command octet contains the value 12, then the value in the next octet
+   *  If a command byte contains the value 12, then the value in the next byte
    *  indicates a command. This "escape" mechanism allows many extra commands
    * to be encoded and this encoding technique helps to minimize the length of
    * the charStrings.
@@ -3148,13 +3148,13 @@ Type1Font.prototype = {
     var count = objects.length;
 
     // If there is no object, just create an array saying that with another
-    // offset octet.
+    // offset byte.
     if (count == 0)
       return '\x00\x00\x00';
 
     var data = String.fromCharCode((count >> 8) & 0xFF, count & 0xff);
 
-    // Next octet contains the offset size use to reference object in the file
+    // Next byte contains the offset size use to reference object in the file
     // Actually we're using 0x04 to be sure to be able to store everything
     // without thinking of it while coding.
     data += '\x04';
@@ -3800,7 +3800,7 @@ var CFFParser = (function CFFParserClosure() {
       return charStrings;
     },
     parsePrivateDict: function parsePrivateDict(parentDict) {
-      // no privateData dict, do nothing
+      // no private dict, do nothing
       if (!parentDict.hasName('Private'))
         return;
       var privateOffset = parentDict.getByName('Private');
@@ -3824,7 +3824,7 @@ var CFFParser = (function CFFParserClosure() {
                                         parentDict.strings);
       parentDict.privateDict = privateDict;
 
-      // Parse the Subrs index also since it's relative to the privateData dict.
+      // Parse the Subrs index also since it's relative to the private dict.
       if (!privateDict.getByName('Subrs'))
         return;
       var subrsOffset = privateDict.getByName('Subrs');
@@ -4611,7 +4611,7 @@ var CFFCompiler = (function CFFCompilerClosure() {
       else
         offsetSize = 4;
 
-      // Next octet contains the offset size use to reference object in the file
+      // Next byte contains the offset size use to reference object in the file
       data.push(offsetSize);
 
       // Add another offset after this one because we need a new offset
diff --git a/src/image.js b/src/image.js
index 22e79ba21..7c23a3426 100644
--- a/src/image.js
+++ b/src/image.js
@@ -314,7 +314,7 @@ var PDFImage = (function PDFImageClosure() {
       var originalHeight = this.height;
       var bpc = this.bpc;
 
-      // rows start at octet boundary;
+      // rows start at byte boundary;
       var rowBytes = (originalWidth * numComps * bpc + 7) >> 3;
       var imgArray = this.getImageBytes(originalHeight * rowBytes);
 
@@ -344,7 +344,7 @@ var PDFImage = (function PDFImageClosure() {
       var height = this.height;
       var bpc = this.bpc;
 
-      // rows start at octet boundary;
+      // rows start at byte boundary;
       var rowBytes = (width * numComps * bpc + 7) >> 3;
       var imgArray = this.getImageBytes(height * rowBytes);
 
diff --git a/src/obj.js b/src/obj.js
index cadc59127..2eb9c6f1d 100644
--- a/src/obj.js
+++ b/src/obj.js
@@ -438,7 +438,7 @@ var XRef = (function XRefClosure() {
       function skipUntil(data, offset, what) {
         var length = what.length, dataLength = data.length;
         var skipped = 0;
-        // finding octet sequence
+        // finding byte sequence
         while (offset < dataLength) {
           var i = 0;
           while (i < length && data[offset + i] == what[i])
@@ -494,7 +494,7 @@ var XRef = (function XRefClosure() {
           var content = buffer.subarray(position, position + contentLength);
 
           // checking XRef stream suspect
-          // (it shall have '/XRef' and next character is not a letter)
+          // (it shall have '/XRef' and next char is not a letter)
           var xrefTagOffset = skipUntil(content, 0, xrefBytes);
           if (xrefTagOffset < contentLength &&
               content[xrefTagOffset + 5] < 64) {
diff --git a/src/parser.js b/src/parser.js
index e2fcb056d..fad8b2c03 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -27,7 +27,7 @@ var Parser = (function ParserClosure() {
       if (isCmd(this.buf2, 'ID')) {
         this.buf1 = this.buf2;
         this.buf2 = null;
-        // skip octet after ID
+        // skip byte after ID
         this.lexer.skip();
       } else {
         this.buf1 = this.buf2;
@@ -424,7 +424,7 @@ var Lexer = (function LexerClosure() {
             stream.skip();
             var x2 = toHexDigit(stream.getChar());
             if (x2 == -1)
-              error('Illegal digit in hex character in name: ' + x2);
+              error('Illegal digit in hex char in name: ' + x2);
             str += String.fromCharCode((x << 4) | x2);
           } else {
             str += '#';
diff --git a/src/stream.js b/src/stream.js
index 6911b7163..d31f3d50b 100644
--- a/src/stream.js
+++ b/src/stream.js
@@ -1162,10 +1162,10 @@ var RunLengthStream = (function RunLengthStreamClosure() {
   RunLengthStream.prototype = Object.create(DecodeStream.prototype);
 
   RunLengthStream.prototype.readBlock = function runLengthStreamReadBlock() {
-    // The repeatHeader has following format. The first octet defines type of run
+    // The repeatHeader has following format. The first byte defines type of run
     // and amount of bytes to repeat/copy: n = 0 through 127 - copy next n bytes
-    // (in addition to the second octet from the header), n = 129 through 255 -
-    // duplicate the second octet from the header (257 - n) times, n = 128 - end.
+    // (in addition to the second byte from the header), n = 129 through 255 -
+    // duplicate the second byte from the header (257 - n) times, n = 128 - end.
     var repeatHeader = this.str.getBytes(2);
     if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] == 128) {
       this.eof = true;
diff --git a/src/utils/fonts_utils.js b/src/utils/fonts_utils.js
index c3ff578bb..65c02fce2 100644
--- a/src/utils/fonts_utils.js
+++ b/src/utils/fonts_utils.js
@@ -175,7 +175,7 @@ function readFontDictData(aString, aMap) {
  * In CFF an INDEX is a structure with the following format:
  *  {
  *    count: 2 bytes (Number of objects stored in INDEX),
- *    offsize: 1 octet (Offset array element size),
+ *    offsize: 1 byte (Offset array element size),
  *    offset: [count + 1] bytes (Offsets array),
  *    data: - (Objects data)
  *  }