HeidiSQL 12.21 release with index size and column in database tree

Get it from the download page

Notable changes

• feature: table editor shows size of indexes in separate column

• feature: show columns as children of tables, in database tree

• fix: always enable release link label on update check dialog, which points to the general download page

• fix: CAST(x AS CHAR) not supported by MySQL below v4.0.2

• fix: refresh session list after import settings file

• fix: crash during refresh on disconnected session

• fix: bad width of collation combo box

• fix: hang when selecting a lot of records and trying to copy/right click

• fix: on PostgreSQL and SQLite, "Explain current query" does nothing and executes an empty string

• Linux/macOS: rich text and icons in SQL completion proposal

• Linux/macOS: refactor parsing the command line

• Linux/macOS: fix various too narrow number inputs in Preferences

• Linux/macOS: give the trees and grids more height for the header

• Linux/macOS: experimental user manager for PostgreSQL

• Linux: fix column selection context menu with right-click does not work

• macOS: fix app bundle always reporting version 1.0, affecting Munki, Jamf, Microsoft Intune and others

• macOS: fix "File > New Window" does nothing

• macOS: fix: crash when cancelling session manager while a session rename is active

• Update MariaDB Connector/C to v3.4.9

• Update libssl and libcrypto to v3.5.7, fixing CVE-2026-31790 and CVE-2025-15467

• and more: https://github.com/HeidiSQL/HeidiSQL/releases/tag/v12.21

Note: You can already get a preview of v13 for Windows, built on the same codebase as the Linux version. See the download page for a zip package.

Excellent work. The new version is much more usable in Linux, because of a few but important (at least for me) details that are now fixed. I've been using the Qt6 build without any issues. Thank you!