diff --git a/png.h b/png.h
index 922fe16..7d44b7b 100644
--- a/png.h
+++ b/png.h
@@ -2652,7 +2652,7 @@
  * 3) Call the appropriate png_image_write... function with a pointer to the
  * image to write the PNG data.
  *
- * png_image is a structure that describes the in-memory formant of an image
+ * png_image is a structure that describes the in-memory format of an image
  * when it is being read or define the in-memory format of an image that you
  * need to write:
  */
@@ -2734,7 +2734,7 @@
 #endif
 
 /* Supported formats are as follows.  Future versions of libpng may support more
- * formats, for compatibility with older versions simply check if the format
+ * formats; for compatibility with older versions simply check if the format
  * macro is defined using #ifdef.  These defines describe the in-memory layout
  * of the components of the pixels of the image.
  *
diff --git a/pngpriv.h b/pngpriv.h
index 9a28382..0989521 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -515,7 +515,7 @@
    abs((int)((c1).green) - (int)((c2).green)) + \
    abs((int)((c1).blue) - (int)((c2).blue)))
 
-/* Added to libpng-1.5.7: sRGB convertion tables */
+/* Added to libpng-1.5.7: sRGB conversion tables */
 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
 PNG_EXTERN /*PRIVATE*/ PNG_CONST png_uint_16 png_sRGB_table[256];
    /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
diff --git a/pngread.c b/pngread.c
index d96b98a..c4fb05b 100644
--- a/pngread.c
+++ b/pngread.c
@@ -83,8 +83,9 @@
 
 #ifdef PNG_SETJMP_SUPPORTED
 /* Applications that neglect to set up their own setjmp() and then
-   encounter a png_error() will longjmp here.  Since the jmpbuf is
-   then meaningless we abort instead of returning. */
+ * encounter a png_error() will longjmp here.  Since the jmpbuf is
+ * then meaningless we abort instead of returning.
+ */
 #ifdef USE_FAR_KEYWORD
    if (setjmp(tmp_jmpbuf))
 #else
diff --git a/pngrtran.c b/pngrtran.c
index a4a1a9f..112d2b8 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -2562,7 +2562,7 @@
    if (row_info->bit_depth == 16)
    {
       png_bytep sp = row; /* source */
-      png_bytep dp = row; /* destinaton */
+      png_bytep dp = row; /* destination */
       png_bytep ep = sp + row_info->rowbytes; /* end+1 */
 
       while (sp < ep)
@@ -2623,7 +2623,7 @@
    if (row_info->bit_depth == 16)
    {
       png_bytep sp = row; /* source */
-      png_bytep dp = row; /* destinaton */
+      png_bytep dp = row; /* destination */
       png_bytep ep = sp + row_info->rowbytes; /* end+1 */
 
       while (sp < ep)
@@ -3331,7 +3331,7 @@
                if (red != green || red != blue)
                   rgb_error |= 1;
 
-               /* From 1.5.5 in the 16 bit case do the accurate convertion even
+               /* From 1.5.5 in the 16 bit case do the accurate conversion even
                 * in the 'fast' case - this is because this is where the code
                 * ends up when handling linear 16 bit data.
                 */
diff --git a/pngwrite.c b/pngwrite.c
index 76bdd79..9c2e533 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -493,8 +493,9 @@
 
 #ifdef PNG_SETJMP_SUPPORTED
 /* Applications that neglect to set up their own setjmp() and then
-   encounter a png_error() will longjmp here.  Since the jmpbuf is
-   then meaningless we abort instead of returning. */
+ * encounter a png_error() will longjmp here.  Since the jmpbuf is
+ * then meaningless we abort instead of returning.
+ */
 #ifdef USE_FAR_KEYWORD
    if (setjmp(tmp_jmpbuf))
 #else
@@ -1709,8 +1710,8 @@
    png_voidp       local_row;
 } png_image_write_control;
 
-/* Write png_uint_16 input to a 16-bit PNG, the png_ptr has already been set to
- * do any necssary byte swapped.  The component order is defined by the
+/* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to
+ * do any necessary byte swapping.  The component order is defined by the
  * png_image format value.
  */
 static int
@@ -1745,7 +1746,7 @@
 
    /* Work out the output row end and count over this, note that the increment
     * above to 'row' means that row_end can actually be beyond the end of the
-    * row, this is correct.
+    * row; this is correct.
     */
    row_end = output_row + image->width * (channels+1);
 
@@ -1763,7 +1764,7 @@
          out_ptr[aindex] = alpha;
 
          /* Calculate a reciprocal.  The correct calculation is simply
-          * component/alpha*65535 << 15. (I.e. 15 bits of precision), this
+          * component/alpha*65535 << 15. (I.e. 15 bits of precision); this
           * allows correct rounding by adding .5 before the shift.  'reciprocal'
           * is only initialized when required.
           */