diff --git a/CHANGES b/CHANGES
index b10b6bf4c..c7ce777fd 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3259,7 +3259,7 @@ Version 1.5.2beta01 [February 13, 2011]
   Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
     old VisualC++ preprocessor.
   Turned on interlace handling in png_read_png().
-  Fixed gcc pendantic warnings.
+  Fixed gcc pedantic warnings.
   Handle longjmp in Cygwin.
   Fixed png_get_current_row_number() in the interlaced case.
   Cleaned up ALPHA flags and transformations.
@@ -3643,7 +3643,7 @@ Version 1.5.6beta05 [October 12, 2011]
   Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
 
 Version 1.5.6beta06 [October 17, 2011]
-  Removed two redundant tests for unitialized row.
+  Removed two redundant tests for uninitialized row.
   Fixed a relatively harmless memory overwrite in compressed text writing
     with a 1 byte zlib buffer.
   Add ability to call png_read_update_info multiple times to pngvalid.c.
@@ -3689,7 +3689,7 @@ Version 1.5.7beta01 [November 4, 2011]
     crash.  The pngmem.c implementation of png_malloc() included a cast
     to png_size_t which would fail on large allocations on 16-bit systems.
   Fix for the preprocessor of the Intel C compiler. The preprocessor
-    splits adjacent @ signs with a space; this changes the concatentation
+    splits adjacent @ signs with a space; this changes the concatenation
     token from @-@-@ to PNG_JOIN; that should work with all compiler
     preprocessors.
   Paeth filter speed improvements from work by Siarhei Siamashka. This
@@ -4176,7 +4176,7 @@ Version 1.6.0beta27 [August 11, 2012]
     declared even though the functions are never actually defined.  This
     change provides a dummy definition so that the declarations work, yet any
     implementation will fail to compile because of an incomplete type.
-  Re-eliminated the use of strcpy() in pngtest.c.  An unncessary use of
+  Re-eliminated the use of strcpy() in pngtest.c.  An unnecessary use of
     strcpy() was accidentally re-introduced in libpng16; this change replaces
     it with strncpy().
   Eliminated use of png_sizeof(); use sizeof() instead.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06090c874..462a1dfee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -424,7 +424,7 @@ else()
                     WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 
   # A single target handles generation of all generated files.  If
-  # they are dependend upon separately by multiple targets, this
+  # they are depended upon separately by multiple targets, this
   # confuses parallel make (it would require a separate top-level
   # target for each file to track the dependencies properly).
   add_custom_target(genfiles DEPENDS
diff --git a/INSTALL b/INSTALL
index e8edb7240..4c1702251 100644
--- a/INSTALL
+++ b/INSTALL
@@ -284,7 +284,7 @@ those sections that are actually used will be loaded into memory.
 
 XIV. Enabling or disabling hardware optimizations
 
-Certain hardware capabilites, such as the Intel SSE instructions,
+Certain hardware capabilities, such as the Intel SSE instructions,
 are normally detected at run time. Enable them with configure options
 such as one of
 
diff --git a/contrib/conftest/pngcp.dfa b/contrib/conftest/pngcp.dfa
index 15a856e2f..acf200d32 100644
--- a/contrib/conftest/pngcp.dfa
+++ b/contrib/conftest/pngcp.dfa
@@ -33,7 +33,7 @@ option WRITE_16BIT on
 option WRITE_FILTER on
 
 # pngcp needs this to preserve unknown chunks, switching all these on means that
-# pngcp can work without explicit known chunk reading suppport
+# pngcp can work without explicit known chunk reading support
 option UNKNOWN_CHUNKS on
 option SET_UNKNOWN_CHUNKS on
 option HANDLE_AS_UNKNOWN on
diff --git a/contrib/libtests/pngstest.c b/contrib/libtests/pngstest.c
index e0e82ef40..e7e03e809 100644
--- a/contrib/libtests/pngstest.c
+++ b/contrib/libtests/pngstest.c
@@ -2036,7 +2036,7 @@ typedef struct
    /* Precalculated values: */
    int          in_opaque;   /* Value of input alpha that is opaque */
    int          is_palette;  /* Sample values come from the palette */
-   int          accumulate;  /* Accumlate component errors (don't log) */
+   int          accumulate;  /* Accumulate component errors (don't log) */
    int          output_8bit; /* Output is 8-bit (else 16-bit) */
 
    void (*in_gp)(Pixel*, png_const_voidp);
diff --git a/contrib/libtests/pngunknown.c b/contrib/libtests/pngunknown.c
index 12eab7258..d9cc4488b 100644
--- a/contrib/libtests/pngunknown.c
+++ b/contrib/libtests/pngunknown.c
@@ -85,7 +85,7 @@ typedef png_byte *png_const_bytep;
 #define PNG_WRITE_16BIT_SUPPORTED
 #define PNG_READ_16BIT_SUPPORTED
 
-/* This comes from pnglibconf.h afer 1.5: */
+/* This comes from pnglibconf.h after 1.5: */
 #define PNG_FP_1 100000
 #define PNG_GAMMA_THRESHOLD_FIXED\
    ((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1))
diff --git a/contrib/libtests/pngvalid.c b/contrib/libtests/pngvalid.c
index f7dc1a39e..3fdc002a9 100644
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
@@ -102,7 +102,7 @@ typedef png_byte *png_const_bytep;
 #define PNG_WRITE_16BIT_SUPPORTED
 #define PNG_READ_16BIT_SUPPORTED
 
-/* This comes from pnglibconf.h afer 1.5: */
+/* This comes from pnglibconf.h after 1.5: */
 #define PNG_FP_1 100000
 #define PNG_GAMMA_THRESHOLD_FIXED\
    ((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1))
@@ -5270,7 +5270,7 @@ standard_info_part1(standard_display *dp, png_structp pp, png_infop pi)
     */
    standard_palette_validate(dp, pp, pi);
 
-   /* In any case always check for a tranparent color (notice that the
+   /* In any case always check for a transparent color (notice that the
     * colour type 3 case must not give a successful return on the get_tRNS call
     * with these arguments!)
     */
@@ -6780,7 +6780,7 @@ transform_image_validate(transform_display *dp, png_const_structp pp,
    store_image_check(dp->this.ps, pp, 0);
 
    /* Read the palette corresponding to the output if the output colour type
-    * indicates a palette, othewise set out_palette to garbage.
+    * indicates a palette, otherwise set out_palette to garbage.
     */
    if (out_ct == PNG_COLOR_TYPE_PALETTE)
    {
@@ -7991,7 +7991,7 @@ image_transform_png_set_rgb_to_gray_mod(const image_transform *this,
          /* Now calculate the actual gray values.  Although the error in the
           * coefficients depends on whether they were specified on the command
           * line (in which case truncation to 15 bits happened) or not (rounding
-          * was used) the maxium error in an individual coefficient is always
+          * was used) the maximum error in an individual coefficient is always
           * 2/32768, because even in the rounding case the requirement that
           * coefficients add up to 32768 can cause a larger rounding error.
           *
@@ -8207,7 +8207,7 @@ image_transform_png_set_rgb_to_gray_mod(const image_transform *this,
       that->bluef = that->greenf = that->redf = gray;
       that->bluee = that->greene = that->rede = err;
 
-      /* The sBIT is the minium of the three colour channel sBITs. */
+      /* The sBIT is the minimum of the three colour channel sBITs. */
       if (that->red_sBIT > that->green_sBIT)
          that->red_sBIT = that->green_sBIT;
       if (that->red_sBIT > that->blue_sBIT)
diff --git a/contrib/pngminus/png2pnm.bat b/contrib/pngminus/png2pnm.bat
index 449cf3675..a2798c340 100755
--- a/contrib/pngminus/png2pnm.bat
+++ b/contrib/pngminus/png2pnm.bat
@@ -7,7 +7,7 @@ png2pnm.exe -noraw ..\pngsuite\basn0g16.png basn0g16.pgm
 REM -- full-color
 png2pnm.exe -noraw ..\pngsuite\basn2c08.png basn2c08.ppm
 png2pnm.exe -noraw ..\pngsuite\basn2c16.png basn2c16.ppm
-REM -- palletted
+REM -- paletted
 png2pnm.exe -noraw ..\pngsuite\basn3p01.png basn3p01.ppm
 png2pnm.exe -noraw ..\pngsuite\basn3p02.png basn3p02.ppm
 png2pnm.exe -noraw ..\pngsuite\basn3p04.png basn3p04.ppm
@@ -27,7 +27,7 @@ png2pnm.exe -raw ..\pngsuite\basn0g16.png rawn0g16.pgm
 REM -- full-color
 png2pnm.exe -raw ..\pngsuite\basn2c08.png rawn2c08.ppm
 png2pnm.exe -raw ..\pngsuite\basn2c16.png rawn2c16.ppm
-REM -- palletted
+REM -- paletted
 png2pnm.exe -raw ..\pngsuite\basn3p01.png rawn3p01.ppm
 png2pnm.exe -raw ..\pngsuite\basn3p02.png rawn3p02.ppm
 png2pnm.exe -raw ..\pngsuite\basn3p04.png rawn3p04.ppm
diff --git a/contrib/pngminus/png2pnm.sh b/contrib/pngminus/png2pnm.sh
index b1c05370d..756126a53 100755
--- a/contrib/pngminus/png2pnm.sh
+++ b/contrib/pngminus/png2pnm.sh
@@ -8,7 +8,7 @@
 # -- full-color
 ./png2pnm -noraw ../pngsuite/basn2c08.png basn2c08.ppm
 ./png2pnm -noraw ../pngsuite/basn2c16.png basn2c16.ppm
-# -- palletted
+# -- paletted
 ./png2pnm -noraw ../pngsuite/basn3p01.png basn3p01.ppm
 ./png2pnm -noraw ../pngsuite/basn3p02.png basn3p02.ppm
 ./png2pnm -noraw ../pngsuite/basn3p04.png basn3p04.ppm
@@ -28,7 +28,7 @@
 # -- full-color
 ./png2pnm -raw ../pngsuite/basn2c08.png rawn2c08.ppm
 ./png2pnm -raw ../pngsuite/basn2c16.png rawn2c16.ppm
-# -- palletted
+# -- paletted
 ./png2pnm -raw ../pngsuite/basn3p01.png rawn3p01.ppm
 ./png2pnm -raw ../pngsuite/basn3p02.png rawn3p02.ppm
 ./png2pnm -raw ../pngsuite/basn3p04.png rawn3p04.ppm
diff --git a/contrib/pngminus/pnm2png.bat b/contrib/pngminus/pnm2png.bat
index f756cb84d..c02b80bec 100755
--- a/contrib/pngminus/pnm2png.bat
+++ b/contrib/pngminus/pnm2png.bat
@@ -7,7 +7,7 @@ pnm2png.exe basn0g16.pgm basn0g16.png
 REM -- full-color
 pnm2png.exe basn2c08.ppm basn2c08.png
 pnm2png.exe basn2c16.ppm basn2c16.png
-REM -- palletted
+REM -- paletted
 pnm2png.exe basn3p01.ppm basn3p01.png
 pnm2png.exe basn3p02.ppm basn3p02.png
 pnm2png.exe basn3p04.ppm basn3p04.png
@@ -27,7 +27,7 @@ pnm2png.exe rawn0g16.pgm rawn0g16.png
 REM -- full-color
 pnm2png.exe rawn2c08.ppm rawn2c08.png
 pnm2png.exe rawn2c16.ppm rawn2c16.png
-REM -- palletted
+REM -- paletted
 pnm2png.exe rawn3p01.ppm rawn3p01.png
 pnm2png.exe rawn3p02.ppm rawn3p02.png
 pnm2png.exe rawn3p04.ppm rawn3p04.png
diff --git a/contrib/pngminus/pnm2png.sh b/contrib/pngminus/pnm2png.sh
index d79df2fae..2ad17a608 100755
--- a/contrib/pngminus/pnm2png.sh
+++ b/contrib/pngminus/pnm2png.sh
@@ -8,7 +8,7 @@
 # -- full-color
 ./pnm2png basn2c08.ppm basn2c08.png
 ./pnm2png basn2c16.ppm basn2c16.png
-# -- palletted
+# -- paletted
 ./pnm2png basn3p01.ppm basn3p01.png
 ./pnm2png basn3p02.ppm basn3p02.png
 ./pnm2png basn3p04.ppm basn3p04.png
@@ -28,7 +28,7 @@
 # -- full-color
 ./pnm2png rawn2c08.ppm rawn2c08.png
 ./pnm2png rawn2c16.ppm rawn2c16.png
-# -- palletted
+# -- paletted
 ./pnm2png rawn3p01.ppm rawn3p01.png
 ./pnm2png rawn3p02.ppm rawn3p02.png
 ./pnm2png rawn3p04.ppm rawn3p04.png
diff --git a/contrib/testpngs/makepngs.sh b/contrib/testpngs/makepngs.sh
index 059503e23..eb1c15fc9 100755
--- a/contrib/testpngs/makepngs.sh
+++ b/contrib/testpngs/makepngs.sh
@@ -74,7 +74,7 @@ case "$1" in
    --coverage)
       # Comments below indicate cases known to be required and not duplicated
       # in other (required) cases; the aim is to get a minimal set that gives
-      # the maxium code coverage.
+      # the maximum code coverage.
       mpg none gray-alpha 8 # required: code coverage, sRGB opaque component
       mpg none palette 8 # required: basic palette read
       mpg 1.8 gray 2 # required: tests gamma threshold code
diff --git a/contrib/tools/chkfmt b/contrib/tools/chkfmt
index a1b88ccbf..95181fde2 100755
--- a/contrib/tools/chkfmt
+++ b/contrib/tools/chkfmt
@@ -54,7 +54,7 @@ doed(){
 }
 
 # In beta versions the version string which appears in files can be a little
-# long and cause spuriously overlong lines.  To avoid this subtitute the version
+# long and cause spuriously overlong lines.  To avoid this substitute the version
 # string with a 'standard' version a.b.cc before checking for long lines.
 if test -r png.h
 then
diff --git a/contrib/tools/pngcp.c b/contrib/tools/pngcp.c
index 5f304e30f..2f6ea65d2 100644
--- a/contrib/tools/pngcp.c
+++ b/contrib/tools/pngcp.c
@@ -191,7 +191,7 @@ vl_strategy[] =
    /* This controls the order of search. */
    { "huffman", Z_HUFFMAN_ONLY },
    { "RLE", Z_RLE },
-   { "fixed", Z_FIXED }, /* the remainder do window searchs */
+   { "fixed", Z_FIXED }, /* the remainder do window searches */
    { "filtered", Z_FILTERED },
    { "default", Z_DEFAULT_STRATEGY },
    { all, 0 }
@@ -336,7 +336,7 @@ static const option options[] =
 #  define VLC(name) VLCIDAT(name) VLCiCCP(name) VLCzTXt(name)
 
 #  ifdef PNG_SW_COMPRESS_png_level
-      /* The libpng compression level isn't searched beause it justs sets the
+      /* The libpng compression level isn't searched because it justs sets the
        * other things that are searched!
        */
       VLO("compression", compression, 0)
diff --git a/contrib/tools/pngfix.c b/contrib/tools/pngfix.c
index e6403dc48..f494230d8 100644
--- a/contrib/tools/pngfix.c
+++ b/contrib/tools/pngfix.c
@@ -2363,7 +2363,7 @@ zlib_advance(struct zlib *zlib, png_uint_32 nbytes)
       flush = Z_NO_FLUSH;
       out_bytes = 0;
 
-      /* NOTE: expression 3 is only evaluted on 'continue', because of the
+      /* NOTE: expression 3 is only evaluated on 'continue', because of the
        * 'break' at the end of this loop below.
        */
       for (;endrc == ZLIB_OK;
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 02688485e..3e97db417 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -5266,7 +5266,7 @@ or as a "pull request" to
     https://github.com/glennrp/libpng/pulls
 
 We also accept patches built from the tar or zip distributions, and
-simple verbal discriptions of bug fixes, reported either to the
+simple verbal descriptions of bug fixes, reported either to the
 SourceForge bug tracker, to the png-mng-implement at lists.sf.net
 mailing list, as github issues, or directly to glennrp.
 
diff --git a/libpng.3 b/libpng.3
index 7a661e0e4..2b23891d2 100644
--- a/libpng.3
+++ b/libpng.3
@@ -5784,7 +5784,7 @@ or as a "pull request" to
     https://github.com/glennrp/libpng/pulls
 
 We also accept patches built from the tar or zip distributions, and
-simple verbal discriptions of bug fixes, reported either to the
+simple verbal descriptions of bug fixes, reported either to the
 SourceForge bug tracker, to the png-mng-implement at lists.sf.net
 mailing list, as github issues, or directly to glennrp.
 
diff --git a/png.h b/png.h
index cba3e889e..04c36b534 100644
--- a/png.h
+++ b/png.h
@@ -1137,7 +1137,7 @@ PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
  * corresponding composited pixel, and the color channels are unassociated
  * (not premultiplied).  The gamma encoded color channels must be scaled
  * according to the contribution and to do this it is necessary to undo
- * the encoding, scale the color values, perform the composition and reencode
+ * the encoding, scale the color values, perform the composition and re-encode
  * the values.  This is the 'PNG' mode.
  *
  * The alternative is to 'associate' the alpha with the color information by
@@ -3217,7 +3217,7 @@ PNG_EXPORT(245, int, png_image_write_to_memory, (png_imagep image, void *memory,
  * option and 'onoff' is 0 (off) or non-0 (on).  The value returned is given
  * by the PNG_OPTION_ defines below.
  *
- * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions,
+ * HARDWARE: normally hardware capabilities, such as the Intel SSE instructions,
  *           are detected at run time, however sometimes it may be impossible
  *           to do this in user mode, in which case it is necessary to discover
  *           the capabilities in an OS specific way.  Such capabilities are
diff --git a/pngget.c b/pngget.c
index 26e9fb1c3..ae677361b 100644
--- a/pngget.c
+++ b/pngget.c
@@ -367,7 +367,7 @@ png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 static png_fixed_point
 png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
 {
-   /* Convert from metres * 1,000,000 to inches * 100,000, meters to
+   /* Convert from meters * 1,000,000 to inches * 100,000, meters to
     * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
     * Notice that this can overflow - a warning is output and 0 is
     * returned.
diff --git a/pngrtran.c b/pngrtran.c
index 5c4128db3..40c2ce56f 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -2979,7 +2979,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
  *  values this results in an implicit assumption that the original PNG RGB
  *  values were linear.
  *
- *  Other integer coefficents can be used via png_set_rgb_to_gray().  Because
+ *  Other integer coefficients can be used via png_set_rgb_to_gray().  Because
  *  the API takes just red and green coefficients the blue coefficient is
  *  calculated to make the sum 32768.  This will result in different rounding
  *  to that used above.
diff --git a/pngstruct.h b/pngstruct.h
index afef2c028..b5cabe974 100644
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -307,7 +307,7 @@ struct png_struct_def
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-   png_color_8 shift;         /* shift for significant bit tranformation */
+   png_color_8 shift;         /* shift for significant bit transformation */
 #endif
 
 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
diff --git a/projects/owatcom/pngconfig.mak b/projects/owatcom/pngconfig.mak
index 3ef2948ca..11f1aa72b 100644
--- a/projects/owatcom/pngconfig.mak
+++ b/projects/owatcom/pngconfig.mak
@@ -117,7 +117,7 @@ $#   3) Delete this file (config.inf).
 <<
  @$(COPY) << pngconfig.dfa
 $# pngconfig.dfa: this file contains configuration options for libpng.
-$# If emtpy the standard configuration will be built.  For this file to be
+$# If empty the standard configuration will be built.  For this file to be
 $# used a working version of the program 'awk' is required and the program
 $# must be identified in the 'before' rule of the project.
 $#
@@ -144,7 +144,7 @@ $# dependency on pnglibconf.h correctly.
 $#
 $# If awk isn't set then this file is bypassed.  If you just want the standard
 $# configuration it is automatically produced from the distributed version
-$# (scripts\pnglibconf.h.prebuilt) by editting PNG_API_RULE to 2 (to force use
+$# (scripts\pnglibconf.h.prebuilt) by editing PNG_API_RULE to 2 (to force use
 $# of the OpenWatcom library calling convention.)
 $#
 <<
diff --git a/scripts/options.awk b/scripts/options.awk
index 5a0e62652..fef5dfd78 100755
--- a/scripts/options.awk
+++ b/scripts/options.awk
@@ -805,8 +805,8 @@ END{
    print comment, "end of options", cend >out
 
    # Do the 'setting' values second, the algorithm the standard
-   # tree walk (O(1)) done in an O(2) while/for loop; interations
-   # settings x depth, outputing the deepest required macros
+   # tree walk (O(1)) done in an O(2) while/for loop; iterations
+   # settings x depth, outputting the deepest required macros
    # first.
    print "" >out
    print "/* SETTINGS */" >out
diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index a1e7a9164..b298a72f3 100644
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -189,7 +189,7 @@ setting USER_VERSIONINFO_LEGALTRADEMARKS
 
 setting API_RULE default 0
 
-# This allows a prefix to be added to the front of every API functon name (and
+# This allows a prefix to be added to the front of every API function name (and
 # therefore every symbol) by redefining all the function names with the prefix
 # at the end of pnglibconf.h.  It also turns on similar internal symbol renaming
 # by causing a similar build-time only file, pngprefix.h, to be generated.