diff --git a/api/src/main/java/io/jsonwebtoken/io/Base64.java b/api/src/main/java/io/jsonwebtoken/io/Base64.java
index 201e3c54..c03d00a9 100644
--- a/api/src/main/java/io/jsonwebtoken/io/Base64.java
+++ b/api/src/main/java/io/jsonwebtoken/io/Base64.java
@@ -111,7 +111,7 @@ final class Base64 { //final and package-protected on purpose
         // Encode even 24-bits
         for (int s = 0, d = 0, cc = 0; s < eLen; ) {
 
-            // Copy next three bytes into lower 24 bits of int, paying attension to sign.
+            // Copy next three bytes into lower 24 bits of int, paying attention to sign.
             int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
 
             // Encode the int into four chars
@@ -339,7 +339,7 @@ final class Base64 { //final and package-protected on purpose
         // Encode even 24-bits
         for (int s = sOff, d = 0, cc = 0; s < sOff + eLen; ) {
 
-            // Copy next three bytes into lower 24 bits of int, paying attension to sign.
+            // Copy next three bytes into lower 24 bits of int, paying attention to sign.
             int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
 
             // Encode the int into four chars
diff --git a/api/src/main/java/io/jsonwebtoken/lang/Strings.java b/api/src/main/java/io/jsonwebtoken/lang/Strings.java
index 065bb251..541ac29e 100644
--- a/api/src/main/java/io/jsonwebtoken/lang/Strings.java
+++ b/api/src/main/java/io/jsonwebtoken/lang/Strings.java
@@ -196,7 +196,7 @@ public final class Strings {
 
     /**
      * Trim <i>all</i> whitespace from the given String:
-     * leading, trailing, and inbetween characters.
+     * leading, trailing, and intermediate characters.
      * @param str the String to check
      * @return the trimmed String
      * @see java.lang.Character#isWhitespace
@@ -253,7 +253,7 @@ public final class Strings {
     }
 
     /**
-     * Trim all occurences of the supplied leading character from the given String.
+     * Trim all occurrences of the supplied leading character from the given String.
      * @param str the String to check
      * @param leadingCharacter the leading character to be trimmed
      * @return the trimmed String
@@ -270,7 +270,7 @@ public final class Strings {
     }
 
     /**
-     * Trim all occurences of the supplied trailing character from the given String.
+     * Trim all occurrences of the supplied trailing character from the given String.
      * @param str the String to check
      * @param trailingCharacter the trailing character to be trimmed
      * @return the trimmed String
@@ -369,7 +369,7 @@ public final class Strings {
     }
 
     /**
-     * Replace all occurences of a substring within a string with
+     * Replace all occurrences of a substring within a string with
      * another string.
      * @param inString String to examine
      * @param oldPattern String to replace