diff --git a/pngiend.c b/pngiend.c
new file mode 100644
index 000000000..64dbc4c66
--- /dev/null
+++ b/pngiend.c
@@ -0,0 +1,112 @@
+
+#include <stdio.h>
+
+/* Copyright 2013 Glenn Randers-Pehrson */
+
+/* Usage:            
+ * pngiend.exe < file.png > file.iend
+ *
+ * file.iend is the image datastream, minus everything through the
+ * last IDAT chunk.
+ */
+
+main()
+{
+   unsigned int c;
+   unsigned int i;
+   unsigned int len[5];
+   unsigned int length;
+   unsigned int mode;
+   unsigned int name[5];
+
+   len[4]='\0';
+   name[4]='\0';
+   mode=0; /* Looking for IDAT */
+
+/* Skip 8-byte signature */
+   for (i=8; i; i--)
+   {
+      c=getchar();
+      if (c == EOF)
+         break;
+   }
+
+   for (;;)
+   {
+      /* read length */
+      len[0]=getchar();
+      if (len[0] == EOF)
+         break;
+      len[1]=getchar();
+      len[2]=getchar();
+      len[3]=getchar();
+      if (len[3] == EOF)
+         break;
+      length=len[0]<<24 | len[1]<<16 | len[2]<< 8 | len[3];
+
+      /* read chunkname */
+      name[0]=getchar();
+      name[1]=getchar();
+      name[2]=getchar();
+      name[3]=getchar();
+      if (name[3] == EOF)
+         break;
+
+      if (name[0] == 'I' && name[1] == 'D' && name[2] == 'A' && \
+          name[3] == 'T')
+         {
+            if (mode == 0)
+               mode = 1; /* found IDAT */
+         }
+      else
+         {
+            if (mode == 1)
+               mode = 2; /* found chunk after IDAT */
+         }
+   
+      if (mode == 2)
+         {
+            /* copy the length bytes */
+            putchar(len[0]);
+            putchar(len[1]);
+            putchar(len[2]);
+            putchar(len[3]);
+             
+            /* copy the name bytes */
+            putchar(name[0]);
+            putchar(name[1]);
+            putchar(name[2]);
+            putchar(name[3]);
+         }
+         
+      /* skip or copy the data bytes */
+      for (i=length; i; i--)
+      {
+         c=getchar();
+         if (c == EOF)
+            break;
+         if (mode == 2)
+            putchar(c);
+      }
+      if (c == EOF)
+         break;
+
+      /* skip or copy crc bytes */
+      for (i=4; i; i--)
+      {
+         c=getchar();
+         if (c == EOF)
+            break;
+         if (mode == 2)
+            putchar(c);
+      }
+      if (c == EOF)
+         break;
+   
+      if (name[0] == 'I' && name[1] == 'E' && name[2] == 'N' && \
+          name[3] == 'D')
+         {
+            break;
+         }
+   }
+}
diff --git a/pngihdr.c b/pngihdr.c
new file mode 100644
index 000000000..bd0e6c429
--- /dev/null
+++ b/pngihdr.c
@@ -0,0 +1,98 @@
+
+#include <stdio.h>
+
+/* Copyright 2013 Glenn Randers-Pehrson */
+
+/* Usage:            
+ * pngidat.exe < file.png > file.ihdr
+ *
+ * file.ihdr is the image datastream, with the PNG signature bytes
+ * and all chunks up to the first IDAT.
+ */
+
+main()
+{
+   unsigned int i;
+   unsigned int len[5];
+   unsigned int name[5];
+   unsigned int c;
+
+   len[4]='\0';
+   name[4]='\0';
+
+/* Copy 8-byte signature */
+   for (i=8; i; i--)
+   {
+      c=getchar();
+      if (c == EOF)
+         break;
+      putchar(c);
+   }
+
+   for (;;)
+   {
+      /* read length */
+      unsigned int length;
+      len[0]=getchar();
+      if (len[0] == EOF)
+         break;
+      len[1]=getchar();
+      len[2]=getchar();
+      len[3]=getchar();
+      if (len[3] == EOF)
+         break;
+      length=len[0]<<24 | len[1]<<16 | len[2] << 8 | len[3];
+
+      /* read chunkname */
+      name[0]=getchar();
+      name[1]=getchar();
+      name[2]=getchar();
+      name[3]=getchar();
+      if (name[3] == EOF)
+         break;
+
+      if (name[0] == 'I' && name[1] == 'D' && name[2] == 'A' && name[3] == 'T')
+          break;
+   
+      /* copy the length bytes */
+      putchar(len[0]);
+      putchar(len[1]);
+      putchar(len[2]);
+      putchar(len[3]);
+       
+      /* copy the name bytes */
+      putchar(name[0]);
+      putchar(name[1]);
+      putchar(name[2]);
+      putchar(name[3]);
+   
+      /* copy the data bytes */
+      for (i=length; i; i--)
+      {
+         c=getchar();
+         if (c == EOF)
+            break;
+         putchar(c);
+      }
+      if (c == EOF)
+         break;
+
+      /* copy crc bytes */
+      for (i=4; i; i--)
+      {
+         c=getchar();
+         if (c == EOF)
+            break;
+         putchar(c);
+      }
+      if (c == EOF)
+         break;
+   
+      if (name[0] == 'I' && name[1] == 'E' && name[2] == 'N' && name[3] == 'D')
+      {
+         /* should not happen */
+         break;
+      }
+   
+   }
+}