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Helper module to prevent PDOExceptions, if your database isn't able to save
utf-8 4-byte characters, but users try to insert emojis, Asian symbols or
mathematical symbols.

If that happens, you get errors like:

SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xF0\x9F\x98\x80' for column...

The module can get uninstalled again, as soon as your database got updated to
support these 4-byte characters.

Until then you have the option to either prevent form submission with
problematic characters, or (silently) replace them on submission.


  • Install this module using the official Backdrop CMS instructions
  • Go to admin/config/content/utf8mb4_helper and set your preferences


Bugs and Feature requests should be reported in the Issue Queue

Current Maintainers

Created for Backdrop CMS by Indigoxela


This project is GPL v2 software. See the LICENSE.txt file in this directory for complete text.