Abstract
We present tfm-validate, a TeX Font Metrics format checker. The library’s core functionality is to inspect TFM files and report any discovered compliance issue. It can be run on individual files or complete directory trees. tfm-validate also provides a convenience function to (in)validate a local TeXLive installation. When run this way, the library processes every TFM file in the distribution and generates a website aggregating all the discovered non-compliance issues. One public instance of tfm-validate is now automatically triggered on a daily basis. The corresponding website is available at https://texlive.info/tfm-validate/.