Automatically fill in single-credential entries

[davidhedlund]

Checks

• [x] I have read the Wiki, searched the open issues, and still think this is a new feature.

Explain the problem clearly and succinctly:

Background

Single-credential entries can be filled automatically in:

• Firefox: “Autofill logins and passwords” feature (enabled by default). It fills single-credential entries automatically.
  • KeePassXC-Browser: The Firefox add-on KeePassXC-Browser (not to be confused with KeePassDX) provides an option named "Automatically fill in single-credential entries" that mimics Firefox’s built-in “Autofill logins and passwords” feature (enabled by default).
• Android: "Google" is used as the default autofill service in Android by default. It fills single-credential entries automatically.

This behavior allows users to skip the manual selection step when only one matching login exists, improving convenience without compromising security.

Problem

Currently, KeePassDX does not have an option to automatically fill single-entry credentials, requiring manual selection every time—even when only one matching entry is available. Users migrating from other managers may find this disruptive to their normal workflow.

Describe the solution you'd like:

Proposal

Implement an optional setting under the browser or autofill preferences:

Option: Automatically fill in single-credential entries
Sub-label: Let KeePassDX automatically fill in credentials if it receives only a single entry.

Rationale

This option would:

• Provide parity with KeePassXC-Browser’s existing functionality.
• Allow users to achieve a seamless autofill experience without relying on Google’s credential provider or Firefox’s built-in manager.
• Improve efficiency when dealing with single-account websites or apps.

References

1. Firefox → about:addons → Webext-keepassxc-browser → Preferences → General → "Automatically fill in single-credential entries"
2. KeePassXC-Browser documentation: https://addons.mozilla.org/en-US/firefox/addon/keepassxc-browser/

Implementation Notes

• The feature should be disabled by default for safety, with an explanatory tooltip describing the behavior.
• Should work consistently for both web and app autofill contexts (depending on KeePassDX’s integration level).

Describe alternatives you've considered:

No response

Additional context:

No response

[J-Jamet]

This option is available for Passkey, but since the new Autofill API has not yet been developed in KeePassDX, it is not yet available. It will be available once https://github.com/Kunzisoft/KeePassDX/issues/2139 is complete.

[davidhedlund]

This option is available for Passkey, but since the new Autofill API has not yet been developed in KeePassDX, it is not yet available. It will be available once #2139 is complete.

That is good news! Thank you.

[J-Jamet]

Well, I was too confident about the possibility of automatically filling in entries with the new API. Currently, it only works on native applications under certain conditions, so not for browsers with web forms. There are quite significant constraints with autofill on Android, so I tried to improve the workflows as much as possible, but it will still be necessary to select the entry for technical security reasons. The operation is not at all the same on KeePassXC because there are far fewer constraints on PCs.