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generate GCC code coverage reports

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Gcovr provides a utility for managing the use of the GNU gcov utility and generating summarized code coverage results. This command is inspired by the Python package, which provides a similar utility for Python.

The gcovr command can produce different kinds of coverage reports:

CLI Option User Guide Description
default, --txt Text Output compact human-readable summaries
--html HTML Output overview of all files
--html-details HTML Output annotated source files
--html-template-dir HTML Output use custom set of Jinja2 templates
--csv CSV Output CSV report summarizing the coverage of each file
--json JSON Output JSON report with source file structure and coverage
--json-summary JSON Output JSON summary coverage report
--clover Clover XML Output machine readable XML reports in Clover format
--cobertura Cobertura XML Output machine readable XML reports in Cobertura format
--coveralls Coveralls JSON Output machine readable JSON report in Coveralls format
--jacoco JaCoCo XML Output machine readable XML reports in JaCoCo format
--lcov LCOV info Output machine readable report in LCOV info format
--sonarqube SonarQube XML Output machine readable XML reports in SonarQube format

Thus, gcovr can be viewed as a command-line alternative to the lcov utility, which runs gcov and generates an HTML-formatted report. The development of gcovr was motivated by the need for text summaries and XML reports.

Example HTML summary:


Example HTML details:



Gcovr is available as a Python package that can be installed via pip.

Install newest stable gcovr release from PyPI:

pip install gcovr

Install development version from GitHub:

pip install git+


GCC can instrument the executables to emit coverage data. You need to recompile your code with the following flags:

--coverage -g -O0

Next, run your test suite. This will generate raw coverage files.

Finally, invoke gcovr. This will print a tabular report on the console.


You can also generate detailed or nested HTML reports:

gcovr --html-details coverage.html
gcovr --html-nested coverage.html

Gcovr will create one HTML report per source file and for --html-nested also per directory next to the coverage.html summary.

You should run gcovr from the build directory. The -r option should point to the root of your project. This only matters if you have a separate build directory. For example:

cd build; gcovr -r ..

For complete documentation, read the manual.


If you want to report a bug or contribute to gcovr development, please read our contributing guidelines first:


Copyright (c) 2013-2024 the gcovr authors Copyright (c) 2013 Sandia Corporation. Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains certain rights in this software.

This software is distributed under the 3-clause BSD License. See LICENSE.txt for full details. See AUTHORS.txt for the full list of contributors.

Gcovr development moved to this repository in September, 2013 from Sandia National Laboratories.