Fix 1 — fastest
Reset LibreOffice user profile
A corrupted user profile is the most common cause. Rename the profile folder to reset it:
# Close LibreOffice completely, then rename the profile:
C:\> rename "%APPDATA%\LibreOffice" "LibreOffice-backup"
# LibreOffice creates a fresh profile on next launch
If LibreOffice opens after renaming the profile, the old profile was corrupt. Your documents are not affected — only settings are reset.
Fix 2
Delete the lock file
If LibreOffice crashed, it may leave a lock file that prevents relaunch:
C:\> del "%APPDATA%\LibreOffice\4\user\.lock"
# Then try launching LibreOffice again
Other causes
Other reasons LibreOffice won't open
LibreOffice not opening on Windows 11
SmartScreen or permissions issue
Try right-click > Run as administrator; check Windows Defender exclusionsLibreOffice opens then immediately closes
Java runtime conflict
Tools > Options > LibreOffice > Java > disable Java or update JRESplash screen appears but freezes
Corrupted extensions
Start LibreOffice in safe mode: hold Shift while clicking the iconFAQ
Not opening questions
LibreOffice not opening Windows 11 — fix
Windows 11 may block LibreOffice if it is not on the trusted apps list. Try: (1) right-click LibreOffice shortcut → Run as administrator, (2) check Windows Security → App & browser control → allow LibreOffice, (3) reset the user profile as described above. Windows 11 also resets app permissions after updates.