diff --git a/pdf2htmlEX.1.in b/pdf2htmlEX.1.in
index c2fe5e7..767b195 100644
--- a/pdf2htmlEX.1.in
+++ b/pdf2htmlEX.1.in
@@ -121,6 +121,11 @@ If it's empty, the file name will be determined automatically.
 .B --font-suffix <suffix> (Default: ".ttf"), --font-format <format> (Default: "truetype")
 Specify the suffix and format of fonts extracted from the PDF file. They should be consistent.
 .TP
+.B --external-hint-tool <tool> (Default: "")
+If specified, the tool will be called in order to enhanced hinting for fonts.
+
+The tool will be called as '<tool> <in.suffix> <out.suffix>', where suffix will be the same as specified for --font-suffix.
+.TP
 .B --debug <0|1> (Default: 0)
 Show debug information.
 .TP
diff --git a/src/HTMLRenderer/text.cc b/src/HTMLRenderer/text.cc
index 8d9b9cd..788b386 100644
--- a/src/HTMLRenderer/text.cc
+++ b/src/HTMLRenderer/text.cc
@@ -393,23 +393,38 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
      *
      * Generate the font as desired
      *
+     */
+    string tmp_fn = (char*)str_fmt("%s/__font%s", param->tmp_dir.c_str(), param->font_suffix.c_str());
+    add_tmp_file(tmp_fn);
+    string fn = (char*)str_fmt("%s/f%llx%s", 
+        (param->single_html ? param->tmp_dir : param->dest_dir).c_str(),
+        info.id, param->font_suffix.c_str());
+
+    if(param->single_html)
+        add_tmp_file(fn);
+
+    ffw_save(fn.c_str());
+    ffw_close();
+
+    /* 
+     * Step 4 
      * Reload to retrieve accurate ascent/descent <-- TODO: remove this
      */
+    rename(fn.c_str(), tmp_fn.c_str());
+    ffw_load_font(tmp_fn.c_str());
+    ffw_metric(&info.ascent, &info.descent, &info.em_size);
+    ffw_save(fn.c_str());
+    ffw_close();
+
+    /*
+     * Step 5 (keeping the scope)
+     * Call external hinting program
+     */
+
+    if(param->external_hint_tool != "")
     {
-        auto fn = str_fmt("%s/f%llx%s", 
-                (param->single_html ? param->tmp_dir : param->dest_dir).c_str(),
-                info.id, param->font_suffix.c_str());
-
-        if(param->single_html)
-            add_tmp_file((char*)fn);
-
-        ffw_save((char*)fn);
-        ffw_close();
-
-        ffw_load_font((char*)fn);
-        ffw_metric(&info.ascent, &info.descent, &info.em_size);
-        ffw_save((char*)fn);
-        ffw_close();
+        rename(fn.c_str(), tmp_fn.c_str());
+        system((char*)str_fmt("%s %s %s", param->external_hint_tool.c_str(), tmp_fn.c_str(), fn.c_str()));
     }
 }
 
diff --git a/src/include/Param.h b/src/include/Param.h
index 9b162f0..f29d7e9 100644
--- a/src/include/Param.h
+++ b/src/include/Param.h
@@ -46,6 +46,8 @@ struct Param
     std::string css_filename;
     std::string font_suffix, font_format;
 
+    std::string external_hint_tool;
+
     int debug;
     int clean_tmp;
 };
diff --git a/src/pdf2htmlEX.cc b/src/pdf2htmlEX.cc
index a24bdfc..5cec6df 100644
--- a/src/pdf2htmlEX.cc
+++ b/src/pdf2htmlEX.cc
@@ -81,6 +81,7 @@ void parse_options (int argc, char **argv)
         .add("css-filename", &param.css_filename, "", "Specify the file name of the generated css file")
         .add("font-suffix", &param.font_suffix, ".ttf", "suffix for extracted font files")
         .add("font-format", &param.font_format, "opentype", "format for extracted font files")
+        .add("external-hint-tool", &param.external_hint_tool, "", "external tool for hintting fonts")
 
         .add("debug", &param.debug, 0, "output debug information")
         .add("clean-tmp", &param.clean_tmp, 1, "clean temporary files after processing")