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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →RomM is best understood as a self-hosted library and synchronization layer for a legally obtained ROM collection—not as a universal emulator. It runs in Docker, scans mounted game files, adds metadata and artwork, organizes collections and users, and can launch compatible systems in a browser. With the right setup, it can become the central catalog for a NAS, home server, desktop, and supported handhelds while leaving demanding or unsupported systems to standalone emulators.
This guide covers the complete path: organizing files, deploying RomM with Docker Compose, configuring metadata, repairing mismatches, securing remote access, testing save synchronization, and backing up the installation. Use ROMs, BIOS files, patches, and artwork only where you have the legal right to use them; RomM does not provide copyrighted games or BIOS files.
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What RomM does
RomM is free, open-source, self-hosted software for managing a ROM library. The project describes it as a system for scanning, enriching, browsing, and playing collections. Its core application is licensed under AGPL-3.0. See the official project site and repository for the current project status.
Once configured, RomM can:
- Scan ROM folders and catalog games by platform.
- Match files with external metadata providers.
- Display covers, screenshots, descriptions, manuals, achievements, and related information.
- Organize games with tags, collections, ratings, and custom groupings.
- Handle multi-disc games, DLC, mods, hacks, patches, and manuals.
- Upload and download games through the web interface.
- Launch selected systems in a browser through EmulatorJS or Ruffle.
- Store user-specific save files and save states.
- Provide Admin, Editor, and Viewer accounts.
- Integrate with Playnite, Android devices, and Linux-based handhelds.
- Expose an API used by first-party and community clients.
The important qualification is that RomM catalogs far more systems than it can emulate in a browser. The project documents roughly 400 supported platforms, but “supported” can mean recognized for cataloging or metadata purposes. It does not guarantee a browser emulator core, BIOS support, or reliable playback for every platform. The supported-platform documentation separates these capabilities.
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Is RomM right for you?
RomM is a strong fit if you have games spread across several emulators, computers, or handhelds and want one searchable catalog with artwork, collections, accounts, and downloads. It is particularly useful when a NAS, mini-PC, or home server is already running Docker.
A local frontend such as ES-DE or Playnite may be better if your collection is small, you only need fast local launching, or you do not want to maintain a server. A standalone emulator remains preferable for demanding systems, advanced graphics settings, local low-latency play, and platforms without a suitable browser core.
RomM is also a poor fit if you expect a turnkey cloud service, automatic ROM downloads, universal save compatibility, or maintenance-free public internet access. You remain responsible for updates, credentials, storage, backups, and network security.
What you need before installing
- A Linux server, mini-PC, NAS, Unraid host, TrueNAS system, or another machine capable of running Docker and Docker Compose.
- Storage for ROMs, database data, downloaded artwork, manuals, saves, and states.
- A consistent library directory with readable permissions.
- At least one metadata provider account or API credential if you want automated enrichment.
- Strong, unique passwords and a persistent authentication secret.
- A backup destination separate from the RomM host.
Start on your local network. Add remote access only after the library, authentication, backups, and restore procedure work correctly. The official installation documentation covers Docker, NAS platforms, Kubernetes, and deployment options at docs.romm.app.
Organize the ROM library first
A predictable directory makes mounting and troubleshooting much easier. A generic host layout might look like this:
romm/
├── library/
│ └── roms/
│ ├── nes/
│ ├── snes/
│ ├── game-boy/
│ └── playstation/
├── assets/
├── config/
└── compose/The platform folder names must match RomM’s supported platform slugs. They are not universal folder names shared by every frontend. For example, the supported-platform list uses canonical names such as 3do, while other systems use longer slugs. If your preferred directory names do not match, adjust the platform mapping in config.yml. Consult the current platform list rather than guessing.
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Install RomM with Docker Compose
The official quick start is the safest source for the complete Compose file because image names, environment variables, dependencies, and defaults can change. It uses the RomM application, MariaDB, and Valkey/Redis-related storage, with the application listening on container port 8080. Follow the official quick-start configuration rather than copying an old Compose file from an unrelated guide.
Create a working directory:
mkdir -p ~/romm
cd ~/rommDownload or create docker-compose.yml from the official example, then set persistent mounts for:
- Your ROM library at
/romm/library. - Downloaded and user-created assets at
/romm/assets. - Configuration at
/romm/config. - Persistent MariaDB and Valkey/Redis data volumes.
Generate the authentication secret with:
openssl rand -hex 32Use separate long random passwords for the MariaDB root account and the RomM database account. The RomM DB_PASSWD value must match the database service’s MARIADB_PASSWORD. Keep ROMM_AUTH_SECRET_KEY private and persistent. Changing it casually can invalidate active sessions and outstanding invite links.
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Start the stack:
docker compose up -dCheck that the containers are running:
docker ps -f name=rommOpen http://<host>:8080 on your LAN. The first account created through the setup wizard becomes the Admin account.
The official quick start uses the mutable latest image tag for convenience. For a long-lived installation, check the project’s release page, choose a known compatible release, and pin the image tag after reviewing migration notes. The documentation pages available for this topic have not used completely consistent version labels, so do not treat a page path such as 4.9.2 or a mutable latest tag as proof of the current stable release.
Configure metadata providers
RomM’s catalog is useful without perfect metadata, but provider configuration determines how much artwork and descriptive information it can add.
Hasheous: the simplest starting point
Hasheous uses hash-based matching and proxies IGDB data for titles, descriptions, and artwork. It is the easiest route for users who want to begin without registering several services. Enable it in the environment configuration:
HASHEOUS_API_ENABLED=trueHash matching can be especially useful for recognized, verified dumps, but it does not guarantee a match for every file.
A broader provider combination
RomM’s documentation recommends combining Hasheous with IGDB, SteamGridDB, and RetroAchievements when you want broader enrichment:
- IGDB: additional game data and descriptions.
- SteamGridDB: alternate artwork, usually selected during manual editing.
- RetroAchievements: achievement information, requiring an account and API key.
IGDB requires a Twitch developer application and, according to the documented setup, a phone number for two-factor verification. RomM uses IGDB_CLIENT_ID and IGDB_CLIENT_SECRET. The provider registration interface can change, so verify the current Twitch requirements and redirect settings before creating the application.
ScreenScraper and other providers
ScreenScraper can provide titles, descriptions, covers, screenshots, manuals, and additional box-art variants. Its RomM configuration requires:
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SCREENSCRAPER_PASSWORD=...Other documented integrations include MobyGames, LaunchBox, Flashpoint, and HowLongToBeat. MobyGames access is described by RomM as paid API access. Provider recommendations are project guidance, not a guarantee that one service will produce the most accurate result for every region, dump, or obscure system.
Run the first scan
Before scanning, verify that the host path really contains the folders you expect:
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ls /path/to/libraryA bad bind mount is one of the most common causes of an empty library. Confirm that the container sees the same directory and that its user has permission to read the files. In the web interface:
- Open the scanning control.
- Select the metadata providers you want to use.
- Choose Quick mode for the initial run when following the current documentation.
- Start the scan.
- Watch matched and unmatched counts by platform.
- Inspect a sample before launching another large scan.
The scan survives a browser refresh and reports per-platform progress. RomM’s documentation gives an approximate first-scan estimate of about four seconds per ROM with a fast IGDB or ScreenScraper connection, while hashing adds storage I/O proportional to file size. Treat that as a rough project estimate, not a guaranteed benchmark.
The available scan choices serve different purposes:
- New Platforms: scans platform folders not already in the database.
- Quick: skips files already in the database and is suitable for routine scans.
- Unmatched: retries files that lack external IDs after you fix providers, names, or platform mappings.
- Full or refresh scans: reprocess more of the library and can consume more time and API quota.
RomM also supports manual scans, scheduled scans described as nightly by default, and a filesystem watcher that reacts when files enter or leave the library. A watcher is convenient, but pause it or use deliberate scans during large transfers if it creates noisy or incomplete updates. See the scanning and watcher documentation.
Fix unmatched or incorrectly matched games
When a game is missing or wrong, check the platform slug before changing anything else. Then:
- Confirm the file is inside the mounted library path.
- Rename it using a consistent title, region, revision, and disc convention.
- Check provider credentials and rate limits.
- Run a targeted Unmatched scan.
- Manually match or edit exceptional files.
A full rescan is usually unnecessary when only a few titles are wrong. Be especially careful with regional releases, revisions, translations, hacks, prototypes, and multi-disc sets. Different providers may identify the same file differently, and a visually similar cover does not prove that the metadata match is correct.
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RomM can launch some games in a browser through EmulatorJS and Ruffle. Browser play is convenient because the client does not need an emulator installation, and it can work well for older systems on phones, tablets, laptops, and lightweight machines.
It is not universal. Playback depends on the platform, available browser core, BIOS or firmware requirements, browser compatibility, client CPU performance, server performance, controller mapping, and network latency. Modern or demanding systems may be unsuitable, particularly over a remote connection. Standalone emulators remain better for advanced graphics options, shaders, low-latency local play, and systems without a usable browser core.
Do not infer browser play from catalog support. A platform may be recognized, matched to metadata, and displayed in the library without having a working EmulatorJS or Ruffle configuration.
Understand saves and save states
A save file is an in-game save such as .sav, .srm, or .save. A save state is an emulator-specific memory snapshot. Save states generally cannot move safely between incompatible emulator cores or different emulator implementations.
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RomM stores saves and states per user and per ROM under a path similar to:
/romm/assets/<user>/<rom>/Browser save and load operations can be written back to the server, and users can upload saves or states produced by another emulator or device. However, “save sync” is not universal. Test the exact handheld application, emulator core, game, and file format you intend to use. Use the same RomM account on both clients, and avoid treating simultaneous edits as automatically conflict-free. The saves and states guide explains the distinction.
Connect handhelds and desktop clients
Documented first-party integrations include:
- Argosy: an Android client that browses the library, downloads ROMs, launches them into RetroArch or another emulator, and can optionally synchronize saves and states.
- Grout: a client for Linux-based handhelds and several custom-firmware ecosystems.
- Playnite Plugin: integrates the RomM library with Playnite on Windows.
The project README also lists community clients and tools. Treat those separately from first-party applications: the RomM team does not necessarily review all community source code or guarantee its behavior. Check permissions, release activity, and the client’s handling of credentials before pairing it with your server.
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Secure RomM for remote access
The application listens on plain HTTP at port 8080. Do not forward that port directly to the public internet. For remote access, place RomM behind a reverse proxy that terminates HTTPS, or keep the service private behind a VPN or zero-trust access layer.
Supported reverse-proxy approaches include Caddy, nginx, Traefik, and Nginx Proxy Manager. A minimal Caddy configuration inside a suitable network might look like:
romm.example.com {
reverse_proxy romm:8080
}Caddy can request Let’s Encrypt certificates when DNS and network prerequisites are satisfied. Consult the official reverse-proxy guide for the complete deployment details.
For a safe remote-access checklist:
- Use HTTPS and a strong Admin password.
- Keep RomM, Docker, the host operating system, and the proxy updated.
- Prefer a VPN or private access layer when public exposure is unnecessary.
- Avoid anonymous access except for a deliberate kiosk or demonstration setup.
- Treat API tokens like passwords.
- Confirm upload limits and proxy headers for large ROMs and assets.
- Set
ROMM_BASE_URLcorrectly if deploying beneath a non-root path.
HTTPS is required for OIDC and PWA installation according to the deployment documentation. Get local username/password authentication working first, then add OIDC if it solves a real access-management need. Kiosk mode is read-only and should not be confused with secure account-based sharing.
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Use roles instead of sharing one account
RomM documents three main roles:
- Admin: full access, including user management and task execution.
- Editor: can curate ROMs, platforms, collections, and uploads, but cannot manage users.
- Viewer: can browse the library and manage personal saves, states, screenshots, and profile information.
Reserve Admin for the owner or a trusted operator. Use Editor only for household members who genuinely need to change the collection, and Viewer for guests or children. Test permissions with a non-admin account before sharing the server, and avoid using one shared account across multiple devices.
Back up the whole application, not only the ROM folder
The ROM directory is the largest and most obvious data set, but it is not a complete RomM backup. The database contains accounts, metadata, collections, ratings, play sessions, paired devices, and save/state metadata. The assets directory contains user saves, states, screenshots, manuals, and uploaded covers.
| Data | Priority | Why it matters |
|---|---|---|
| Database volume | Critical | Accounts, metadata, collections, ratings, sessions, pairings, and relationships |
/romm/assets |
Critical | Saves, states, screenshots, manuals, and uploaded artwork |
/romm/config |
Critical | Configuration and overrides |
/romm/resources |
Medium | Downloaded covers and screenshots that are often re-downloadable |
/redis-data |
Low | Queue state; lost jobs can generally be rerun |
/romm/library |
Critical | The actual ROM collection, backed up separately |
The official backup documentation recommends nightly backups for the database, assets, and configuration. Store at least one copy on a different device or location. RAID improves availability but is not a backup.
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Perform a restore drill
- Stop or isolate a test RomM instance.
- Restore the database into a clean deployment.
- Restore
assetsandconfig. - Restore or remount the ROM library.
- Start RomM.
- Confirm users, collections, metadata, saves, and device pairings.
- Log in with a non-admin account and launch a test game.
- Record the date and result of the test.
Common failures and recovery
The library is empty
Check the host bind mount, expected roms/ structure, platform slug, and container read permissions:
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docker compose logs rommConfirm the mounted directory contains the expected folders, then run a targeted scan.
Everything is unmatched
Verify that a metadata provider is enabled, credentials are valid, the platform folder is correct, and filenames or hashes are recognizable. Fix those issues, then run an Unmatched scan instead of repeatedly processing the entire collection.
A browser game will not start
Check for an EmulatorJS or Ruffle core, required BIOS or firmware, browser compatibility, server and client performance, and controller mapping. If those are correct, try a standalone emulator; the problem may be emulation support rather than metadata.
Remote access works locally but not externally
Check DNS, proxy upstream settings, firewall and router rules, the TLS certificate, ROMM_BASE_URL, upload/body-size limits, and WebSocket or proxy-header handling where applicable.
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Saves do not appear on another device
Confirm that both devices use the same RomM account, that the integration supports synchronization, that the emulator core uses a compatible save format, and that you are not confusing a save state with an ordinary save file. Verify that the assets volume is mounted and backed up.
An update breaks the installation
- Stop the stack.
- Preserve the database, assets, config, and library.
- Revert to the previously tested image tag.
- Restore the database only if migration damage occurred.
- Read the project release and migration notes.
- Do not delete volumes while troubleshooting.
Alternatives to consider
| Tool | Best for | How it differs |
|---|---|---|
| Gaseous | Another web-oriented ROM manager | Compare current platform coverage, metadata, emulation, and maintenance |
| Retrom | Centralized collection management | Verify its current emulation and synchronization features independently |
| ES-DE | Polished local frontend | Runs locally rather than providing a shared self-hosted web library |
| Playnite | Windows desktop management | Strong local Windows experience; RomM can complement it through its plugin |
| Steam ROM Manager | Adding local games to Steam | Launcher/import utility, not a multi-user server |
| RetroDECK | Preconfigured SteamOS/Linux emulation | Focused on local emulation rather than centralized library management |
The RomM repository lists several adjacent projects, but they should not be assumed to have feature parity.
Verdict
RomM is worth running when you want one self-hosted catalog for a legally obtained multi-system collection, with metadata, artwork, household accounts, downloads, optional browser play, and integrations for other devices. Its best role is the center of your library—not a replacement for every emulator.
Deploy it locally first, pin a tested version, configure at least one metadata provider, inspect unmatched games, test the exact save workflow you need, put remote access behind HTTPS or a private network, and back up the database, assets, configuration, and ROMs separately. That operational discipline is what turns RomM from a Docker container into a dependable game library.
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