Features

Rich Messaging#

Reactions, Replies & Styling — Emoji reactions with quick toolbar, threaded replies, and rich text formatting (bold, italic, code blocks with syntax highlighting)
Emoji Autocomplete — Type : and a keyword to complete emojis inline, with arrow-key navigation and Enter or Tab to insert
Message Retraction & Moderation — Delete your own messages or moderate room messages with full audit trail
Link Previews — Automatic Open Graph previews for shared URLs
File Sharing — HTTP uploads with drag-and-drop, thumbnails, progress indicators, image lightbox, and text file preview
Polls — Create polls in rooms with emoji voting, deadlines, single or multi-vote modes, and live result tallies

Multi-user Chat — Complete MUC support with roles, affiliations, custom hats (role badges), @mentions, and bookmarks
Private Messages in Rooms — Mediated private messages (whispers, XEP-0045 §7.5) to a single occupant, shown as a distinct private thread you can reply to privately
Quick Chat — Instantly create ad-hoc group conversations and invite contacts by name
Per-User Ignore — Mute specific users per room, synced across devices
Activity Log — Persistent feed of events: invitations, subscription requests, reactions, poll votes, joins and leaves

Full-text Search — Instant offline search powered by an IndexedDB inverted index, supplemented by live server archive queries
Find on Page — Cmd/Ctrl+F to search within the current conversation with highlight and scroll
Smart Filters — Type filter pills, in: prefix autocomplete, quoted exact-phrase matching, and keyboard-navigable results with context preview

14 Built-in Themes — Catppuccin, Nord, Dracula, Gruvbox, Tokyo Night, Rosé Pine, Solarized, and more, plus light/dark mode
Custom Themes — Import/export themes as JSON, pick a custom accent color, or write CSS overrides in the built-in editor
Synced Across Devices — Theme, accent, and font size preferences are stored server-side and follow you everywhere
Internationalization — 34 languages including complete EU coverage

Self-hostable — Connect to any XMPP server, no vendor lock-in, no third-party dependency
End-to-End Encryption — OpenPGP (OX-IM, XEP-0373/0374) for 1:1 chats; messages are encrypted and signed; automatic key discovery, peer verification with cross-device sync, secret key backup, and encrypted MAM history decryption
FAST Authentication — Modern SASL2 with token-based reconnection for instant, password-less session resumption
Contact Blocking — Full block/unblock support with a dedicated management screen
In-Band Password Change — Change your account password without leaving the app

Cross-platform — Available on the web, macOS (Intel & Apple Silicon), Windows, and Linux (deb, rpm, flatpak, AUR)
Auto Updates — Built-in update checker with release notes and one-click install (desktop)
Native Notifications — Desktop notifications with click-to-focus; web push notifications even when the tab is closed
Auto-Away — Automatically sets your status to away on system idle and restores it on activity
Offline Support — IndexedDB storage with automatic sync and stream management session resumption on reconnect

Command Palette — Keyboard-accessible launcher for conversations, contacts, rooms, and actions
Keyboard Shortcuts — Comprehensive shortcut system with a categorized help overlay and AZERTY support
Built-in XMPP Console — Live stanza inspector and debug interface
Server Administration — Manage users, rooms, and server commands right from the client (for admins)
User Profiles — Rich user info popovers with vCard details, connected devices, timezone, and last seen status

Headless SDK — Reusable @fluux/sdk package for building custom XMPP clients or bots
50+ XEPs Implemented — MAM, MUC, Stream Management, Message Carbons, HTTP File Upload, Reactions, OpenPGP (OX-IM), FAST, and many more
Compatible — see Compliance of Fluux
Open Source — AGPL-3.0 licensed

Next: Quick Start to get Fluux Messenger running.