diff --git a/src/plugins/clangtools/clangtool.cpp b/src/plugins/clangtools/clangtool.cpp
index 7fd075e26ff..eeb3fad98e7 100644
--- a/src/plugins/clangtools/clangtool.cpp
+++ b/src/plugins/clangtools/clangtool.cpp
@@ -255,8 +255,8 @@ public:
             const Link start = step.ranges.first();
             const Link end = step.ranges.last();
             const bool operationAdded = changeSet.replace(
-                file->position(start.targetLine, start.targetColumn),
-                file->position(end.targetLine, end.targetColumn),
+                file->position(start.targetLine, start.targetColumn + 1),
+                file->position(end.targetLine, end.targetColumn + 1),
                 step.message);
             if (!operationAdded)
                 return false;
diff --git a/src/plugins/clangtools/clangtoolsdiagnosticmodel.cpp b/src/plugins/clangtools/clangtoolsdiagnosticmodel.cpp
index 8c4783c94b0..b6affc351c7 100644
--- a/src/plugins/clangtools/clangtoolsdiagnosticmodel.cpp
+++ b/src/plugins/clangtools/clangtoolsdiagnosticmodel.cpp
@@ -196,7 +196,7 @@ const QList<DiagnosticItem *> &ClangToolsDiagnosticModel::itemsWithSameFixits(
 
 static QString lineColumnString(const Link &location)
 {
-    return QString("%1:%2").arg(location.targetLine).arg(location.targetColumn);
+    return QString("%1:%2").arg(location.targetLine).arg(location.targetColumn + 1);
 }
 
 static QString createExplainingStepToolTipString(const ExplainingStep &step)
diff --git a/src/plugins/clangtools/clangtoolsdiagnosticview.cpp b/src/plugins/clangtools/clangtoolsdiagnosticview.cpp
index 5a96d444ad6..07a48eb5579 100644
--- a/src/plugins/clangtools/clangtoolsdiagnosticview.cpp
+++ b/src/plugins/clangtools/clangtoolsdiagnosticview.cpp
@@ -485,10 +485,8 @@ void DiagnosticView::openEditorForCurrentIndex()
 {
     const QVariant v = model()->data(currentIndex(), Debugger::DetailedErrorView::LocationRole);
     Link loc = v.value<Link>();
-    if (loc.hasValidTarget()) {
-        --loc.targetColumn; // FIXME: Move this to the model side.
+    if (loc.hasValidTarget())
         Core::EditorManager::openEditorAt(loc);
-    }
 }
 
 } // namespace Internal
diff --git a/src/plugins/clangtools/clangtoolslogfilereader.cpp b/src/plugins/clangtools/clangtoolslogfilereader.cpp
index 18beacc2fbf..fa58fe48894 100644
--- a/src/plugins/clangtools/clangtoolslogfilereader.cpp
+++ b/src/plugins/clangtools/clangtoolslogfilereader.cpp
@@ -38,7 +38,7 @@ std::optional<LineColumnInfo> byteOffsetInUtf8TextToLineColumn(const char *text,
 
         // Advance to column
         if (c - text == offset) {
-            int columnCounter = 1;
+            int columnCounter = 0;
             c = lineStart;
             while (c < text + offset && Utils::Text::utf8AdvanceCodePoint(c))
                 ++columnCounter;
@@ -148,7 +148,7 @@ public:
         // Convert
         OptionalLineColumnInfo info = byteOffsetInUtf8TextToLineColumn(data, fileOffset, startLine);
         if (!info)
-            return {m_filePath, 1, 1};
+            return {m_filePath, 1, 0};
 
         // Save/update lookup
         int lineStartOffset = info->lineStartOffset;
diff --git a/src/plugins/clangtools/clangtoolslogfilereader.h b/src/plugins/clangtools/clangtoolslogfilereader.h
index a13f827c375..d294d11e046 100644
--- a/src/plugins/clangtools/clangtoolslogfilereader.h
+++ b/src/plugins/clangtools/clangtoolslogfilereader.h
@@ -28,7 +28,7 @@ Utils::Result<Diagnostics> readExportedDiagnostics(
 // Exposed for tests
 struct LineColumnInfo {
     int line = 1; // 1-based
-    int column = 1; // 1-based
+    int column = 0; // 0-based
     int lineStartOffset = 0; // for optimiation/caching purposes
 };
 using OptionalLineColumnInfo = std::optional<LineColumnInfo>;
diff --git a/src/plugins/clangtools/clangtoolsutils.cpp b/src/plugins/clangtools/clangtoolsutils.cpp
index fc10a34aada..c59d85e4145 100644
--- a/src/plugins/clangtools/clangtoolsutils.cpp
+++ b/src/plugins/clangtools/clangtoolsutils.cpp
@@ -31,7 +31,7 @@ namespace Internal {
 
 static QString lineColumnString(const Link &link)
 {
-    return QString("%1:%2").arg(link.targetLine).arg(link.targetColumn);
+    return QString("%1:%2").arg(link.targetLine).arg(link.targetColumn + 1);
 }
 
 static QString fixitStatus(FixitStatus status)
diff --git a/src/plugins/clangtools/documentclangtoolrunner.cpp b/src/plugins/clangtools/documentclangtoolrunner.cpp
index ef96a2044a3..1189d690797 100644
--- a/src/plugins/clangtools/documentclangtoolrunner.cpp
+++ b/src/plugins/clangtools/documentclangtoolrunner.cpp
@@ -320,7 +320,7 @@ void DocumentClangToolRunner::onDone(const AnalyzeOutputData &output)
             QTextCursor cursor(doc->document());
             cursor.setPosition(Text::positionInText(doc->document(),
                                                     diagnostic.location.targetLine,
-                                                    diagnostic.location.targetColumn));
+                                                    diagnostic.location.targetColumn + 1));
             cursor.movePosition(QTextCursor::EndOfLine);
             marker.cursor = cursor;
             marker.type = Constants::CLANG_TOOL_FIXIT_AVAILABLE_MARKER_ID;
diff --git a/src/plugins/clangtools/documentquickfixfactory.cpp b/src/plugins/clangtools/documentquickfixfactory.cpp
index 6750feb5fce..af668d5f3a3 100644
--- a/src/plugins/clangtools/documentquickfixfactory.cpp
+++ b/src/plugins/clangtools/documentquickfixfactory.cpp
@@ -35,8 +35,8 @@ using DiagnosticRange = QPair<Link, Link>;
 static Range toRange(const QTextDocument *doc, DiagnosticRange locations)
 {
     Range range;
-    range.start = Text::positionInText(doc, locations.first.targetLine, locations.first.targetColumn);
-    range.end = Text::positionInText(doc, locations.second.targetLine, locations.second.targetColumn);
+    range.start = Text::positionInText(doc, locations.first.targetLine, locations.first.targetColumn + 1);
+    range.end = Text::positionInText(doc, locations.second.targetLine, locations.second.targetColumn + 1);
     return range;
 }
 
diff --git a/src/plugins/clangtools/readexporteddiagnosticstest.cpp b/src/plugins/clangtools/readexporteddiagnosticstest.cpp
index ac05a2feceb..287221bde9b 100644
--- a/src/plugins/clangtools/readexporteddiagnosticstest.cpp
+++ b/src/plugins/clangtools/readexporteddiagnosticstest.cpp
@@ -186,7 +186,7 @@ void ReadExportedDiagnosticsTest::testOffsetStartOfFirstLine()
     const auto info = byteOffsetInUtf8TextToLineColumn(asciiWord, 0);
     QVERIFY(info);
     QCOMPARE(info->line, 1);
-    QCOMPARE(info->column, 1);
+    QCOMPARE(info->column, 0);
 }
 
 void ReadExportedDiagnosticsTest::testOffsetEndOfFirstLine()
@@ -194,7 +194,7 @@ void ReadExportedDiagnosticsTest::testOffsetEndOfFirstLine()
     const auto info = byteOffsetInUtf8TextToLineColumn(asciiWord, 2);
     QVERIFY(info);
     QCOMPARE(info->line, 1);
-    QCOMPARE(info->column, 3);
+    QCOMPARE(info->column, 2);
 }
 
 // The invocation
@@ -220,7 +220,7 @@ void ReadExportedDiagnosticsTest::testOffsetOffsetPointingToLineSeparator_unix()
     const auto info = byteOffsetInUtf8TextToLineColumn(asciiMultiLine, 3);
     QVERIFY(info);
     QCOMPARE(info->line, 1);
-    QCOMPARE(info->column, 4);
+    QCOMPARE(info->column, 3);
 }
 
 // For a file with dos style line endings ("\r\n"), clang-tidy points to '\r'.
@@ -229,7 +229,7 @@ void ReadExportedDiagnosticsTest::testOffsetOffsetPointingToLineSeparator_dos()
     const auto info = byteOffsetInUtf8TextToLineColumn(asciiMultiLine_dos, 3);
     QVERIFY(info);
     QCOMPARE(info->line, 1);
-    QCOMPARE(info->column, 4);
+    QCOMPARE(info->column, 3);
 }
 
 void ReadExportedDiagnosticsTest::testOffsetStartOfSecondLine()
@@ -237,7 +237,7 @@ void ReadExportedDiagnosticsTest::testOffsetStartOfSecondLine()
     const auto info = byteOffsetInUtf8TextToLineColumn(asciiMultiLine, 4);
     QVERIFY(info);
     QCOMPARE(info->line, 2);
-    QCOMPARE(info->column, 1);
+    QCOMPARE(info->column, 0);
 }
 
 void ReadExportedDiagnosticsTest::testOffsetMultiByteCodePoint1()
@@ -245,7 +245,7 @@ void ReadExportedDiagnosticsTest::testOffsetMultiByteCodePoint1()
     const auto info = byteOffsetInUtf8TextToLineColumn(nonAsciiMultiLine, 3);
     QVERIFY(info);
     QCOMPARE(info->line, 2);
-    QCOMPARE(info->column, 1);
+    QCOMPARE(info->column, 0);
 }
 
 void ReadExportedDiagnosticsTest::testOffsetMultiByteCodePoint2()
@@ -253,7 +253,7 @@ void ReadExportedDiagnosticsTest::testOffsetMultiByteCodePoint2()
     const auto info = byteOffsetInUtf8TextToLineColumn(nonAsciiMultiLine, 11);
     QVERIFY(info);
     QCOMPARE(info->line, 3);
-    QCOMPARE(info->column, 2);
+    QCOMPARE(info->column, 1);
 }
 
 // Replace FILE_PATH with a real absolute file path in the *.yaml files.
diff --git a/src/plugins/cppcheck/cppcheckdiagnosticview.cpp b/src/plugins/cppcheck/cppcheckdiagnosticview.cpp
index be2ed950538..da6730de63a 100644
--- a/src/plugins/cppcheck/cppcheckdiagnosticview.cpp
+++ b/src/plugins/cppcheck/cppcheckdiagnosticview.cpp
@@ -81,10 +81,8 @@ void DiagnosticView::openEditorForCurrentIndex()
 {
     const QVariant v = model()->data(currentIndex(), Debugger::DetailedErrorView::LocationRole);
     Link loc = v.value<Link>();
-    if (loc.hasValidTarget()) {
-        --loc.targetColumn; // FIXME: Move adjustment to model side.
+    if (loc.hasValidTarget())
         Core::EditorManager::openEditorAt(loc);
-    }
 }
 
 void DiagnosticView::mouseDoubleClickEvent(QMouseEvent *event)
diff --git a/src/plugins/debugger/analyzer/detailederrorview.cpp b/src/plugins/debugger/analyzer/detailederrorview.cpp
index 00cfb19d2e2..9ec400c5395 100644
--- a/src/plugins/debugger/analyzer/detailederrorview.cpp
+++ b/src/plugins/debugger/analyzer/detailederrorview.cpp
@@ -44,10 +44,8 @@ DetailedErrorView::DetailedErrorView(QWidget *parent) :
     connect(this, &QAbstractItemView::clicked, [](const QModelIndex &index) {
         if (index.column() == LocationColumn) {
             Link loc = index.model()->data(index, DetailedErrorView::LocationRole).value<Link>();
-            if (loc.hasValidTarget()) {
-                --loc.targetColumn; // FIXME: Move adjustment to model side.
+            if (loc.hasValidTarget())
                 Core::EditorManager::openEditorAt(loc);
-            }
         }
     });
 
@@ -106,7 +104,7 @@ QVariant DetailedErrorView::locationData(int role, const Link &location)
         return location.hasValidTarget() ? QString::fromLatin1("%1:%2:%3")
                                .arg(location.targetFilePath.fileName())
                                .arg(location.targetLine)
-                               .arg(location.targetColumn)
+                               .arg(location.targetColumn + 1)
                          : QString();
     case Qt::ToolTipRole:
         return location.targetFilePath.isEmpty()