diff --git a/core/fpdfapi/font/cpdf_cidfont.cpp b/core/fpdfapi/font/cpdf_cidfont.cpp
index 8271890..42045a0 100644
--- a/core/fpdfapi/font/cpdf_cidfont.cpp
+++ b/core/fpdfapi/font/cpdf_cidfont.cpp
@@ -392,10 +392,9 @@
     return false;
 
   m_BaseFontName = pCIDFontDict->GetStringFor("BaseFont");
-  if ((m_BaseFontName.Compare("CourierStd") == 0 ||
-       m_BaseFontName.Compare("CourierStd-Bold") == 0 ||
-       m_BaseFontName.Compare("CourierStd-BoldOblique") == 0 ||
-       m_BaseFontName.Compare("CourierStd-Oblique") == 0) &&
+  if ((m_BaseFontName == "CourierStd" || m_BaseFontName == "CourierStd-Bold" ||
+       m_BaseFontName == "CourierStd-BoldOblique" ||
+       m_BaseFontName == "CourierStd-Oblique") &&
       !IsEmbedded()) {
     m_bAdobeCourierStd = true;
   }
diff --git a/core/fpdfapi/font/cpdf_simplefont.cpp b/core/fpdfapi/font/cpdf_simplefont.cpp
index b90accd..8986705 100644
--- a/core/fpdfapi/font/cpdf_simplefont.cpp
+++ b/core/fpdfapi/font/cpdf_simplefont.cpp
@@ -121,7 +121,7 @@
       return;
     }
     ByteString bsEncoding = pEncoding->GetString();
-    if (bsEncoding.Compare("MacExpertEncoding") == 0) {
+    if (bsEncoding == "MacExpertEncoding") {
       bsEncoding = "WinAnsiEncoding";
     }
     GetPredefinedEncoding(bsEncoding, &m_BaseEncoding);
@@ -135,7 +135,7 @@
   if (m_BaseEncoding != PDFFONT_ENCODING_ADOBE_SYMBOL &&
       m_BaseEncoding != PDFFONT_ENCODING_ZAPFDINGBATS) {
     ByteString bsEncoding = pDict->GetStringFor("BaseEncoding");
-    if (bTrueType && bsEncoding.Compare("MacExpertEncoding") == 0)
+    if (bTrueType && bsEncoding == "MacExpertEncoding")
       bsEncoding = "WinAnsiEncoding";
     GetPredefinedEncoding(bsEncoding, &m_BaseEncoding);
   }
diff --git a/core/fpdfdoc/cpdf_bafontmap.cpp b/core/fpdfdoc/cpdf_bafontmap.cpp
index 9f4d65c..4ef2c11 100644
--- a/core/fpdfdoc/cpdf_bafontmap.cpp
+++ b/core/fpdfdoc/cpdf_bafontmap.cpp
@@ -38,11 +38,11 @@
   pFontMapper->LoadInstalledFonts();
 
   for (const auto& font : pFontMapper->m_InstalledTTFonts) {
-    if (font.Compare(sFontFaceName) == 0)
+    if (font == sFontFaceName)
       return true;
   }
   for (const auto& fontPair : pFontMapper->m_LocalizedTTFonts) {
-    if (fontPair.first.Compare(sFontFaceName) == 0)
+    if (fontPair.first == sFontFaceName)
       return true;
   }
   return false;
diff --git a/core/fpdfdoc/cpdf_generateap.cpp b/core/fpdfdoc/cpdf_generateap.cpp
index 70bbcc9..b26b121 100644
--- a/core/fpdfdoc/cpdf_generateap.cpp
+++ b/core/fpdfdoc/cpdf_generateap.cpp
@@ -62,8 +62,8 @@
   if (!pPDFFont)
     return ByteString();
 
-  if (pPDFFont->GetBaseFontName().Compare("Symbol") == 0 ||
-      pPDFFont->GetBaseFontName().Compare("ZapfDingbats") == 0) {
+  if (pPDFFont->GetBaseFontName() == "Symbol" ||
+      pPDFFont->GetBaseFontName() == "ZapfDingbats") {
     return ByteString::Format("%c", Word);
   }
 
diff --git a/core/fxcrt/css/cfx_cssdata.cpp b/core/fxcrt/css/cfx_cssdata.cpp
index cfef220..0e9afb1 100644
--- a/core/fxcrt/css/cfx_cssdata.cpp
+++ b/core/fxcrt/css/cfx_cssdata.cpp
@@ -324,7 +324,7 @@
 
   for (auto* iter = std::begin(lengthUnitTable);
        iter != std::end(lengthUnitTable); ++iter) {
-    if (lowerName.Compare(iter->value) == 0)
+    if (lowerName == iter->value)
       return iter;
   }
 
@@ -340,7 +340,7 @@
 
   for (auto* iter = std::begin(colorTable); iter != std::end(colorTable);
        ++iter) {
-    if (lowerName.Compare(iter->name) == 0)
+    if (lowerName == iter->name)
       return iter;
   }
   return nullptr;
diff --git a/core/fxcrt/xml/cfx_xmlparser.cpp b/core/fxcrt/xml/cfx_xmlparser.cpp
index 0f6df7a..59f7716 100644
--- a/core/fxcrt/xml/cfx_xmlparser.cpp
+++ b/core/fxcrt/xml/cfx_xmlparser.cpp
@@ -504,15 +504,15 @@
         if (character != 0)
           current_text_.push_back(character);
       } else {
-        if (csEntity.Compare(L"amp") == 0) {
+        if (csEntity == L"amp") {
           current_text_.push_back(L'&');
-        } else if (csEntity.Compare(L"lt") == 0) {
+        } else if (csEntity == L"lt") {
           current_text_.push_back(L'<');
-        } else if (csEntity.Compare(L"gt") == 0) {
+        } else if (csEntity == L"gt") {
           current_text_.push_back(L'>');
-        } else if (csEntity.Compare(L"apos") == 0) {
+        } else if (csEntity == L"apos") {
           current_text_.push_back(L'\'');
-        } else if (csEntity.Compare(L"quot") == 0) {
+        } else if (csEntity == L"quot") {
           current_text_.push_back(L'"');
         }
       }
diff --git a/core/fxge/cfx_fontmapper.cpp b/core/fxge/cfx_fontmapper.cpp
index 4e23c31..1a09bf8 100644
--- a/core/fxge/cfx_fontmapper.cpp
+++ b/core/fxge/cfx_fontmapper.cpp
@@ -232,10 +232,10 @@
       continue;
 
     if (bReverse) {
-      if (bsStyle.Last(pStyle->len).Compare(pStyle->name) == 0)
+      if (bsStyle.Last(pStyle->len) == pStyle->name)
         return std::make_tuple(true, pStyle->style, pStyle->len);
     } else {
-      if (bsStyle.First(pStyle->len).Compare(pStyle->name) == 0)
+      if (bsStyle.First(pStyle->len) == pStyle->name)
         return std::make_tuple(true, pStyle->style, pStyle->len);
     }
   }
diff --git a/fpdfsdk/cpdfsdk_helpers.cpp b/fpdfsdk/cpdfsdk_helpers.cpp
index 2f8c54e..30db260 100644
--- a/fpdfsdk/cpdfsdk_helpers.cpp
+++ b/fpdfsdk/cpdfsdk_helpers.cpp
@@ -360,7 +360,7 @@
       if (pArray) {
         for (size_t i = 0; i < pArray->size(); i++) {
           ByteString cbStr = pArray->GetStringAt(i);
-          if (cbStr.Compare("com.adobe.acrobat.SharedReview.Register") == 0) {
+          if (cbStr == "com.adobe.acrobat.SharedReview.Register") {
             RaiseUnsupportedError(FPDF_UNSP_DOC_SHAREDREVIEW);
             break;
           }
diff --git a/fxbarcode/qrcode/BC_QRCoderEncoder.cpp b/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
index d837bff..5d7d613 100644
--- a/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
@@ -325,7 +325,7 @@
 }
 
 CBC_QRCoderMode* ChooseMode(const ByteString& content, ByteString encoding) {
-  if (encoding.Compare("SHIFT_JIS") == 0)
+  if (encoding == "SHIFT_JIS")
     return CBC_QRCoderMode::sKANJI;
 
   bool hasNumeric = false;
diff --git a/fxjs/cjs_publicmethods.cpp b/fxjs/cjs_publicmethods.cpp
index 11f32f9..6549ee8 100644
--- a/fxjs/cjs_publicmethods.cpp
+++ b/fxjs/cjs_publicmethods.cpp
@@ -929,7 +929,7 @@
   int nMonth = 1;
   sTemp = wsArray[1];
   for (size_t i = 0; i < pdfium::size(fxjs::kMonths); ++i) {
-    if (sTemp.Compare(fxjs::kMonths[i]) == 0) {
+    if (sTemp == fxjs::kMonths[i]) {
       nMonth = i + 1;
       break;
     }
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
index 92880c0..54b1763 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
@@ -450,7 +450,7 @@
         return val.Compare(iter.m_wsSomMethodName) > 0;
       });
   if (result != std::end(gs_FMSomMethods) &&
-      methodName.Compare(result->m_wsSomMethodName) == 0) {
+      methodName == result->m_wsSomMethodName) {
     return result->m_dParameters;
   }
   return 0;