Roblox Moderation Systems: Text Filtering, Reporting, and Safe UGC at Scale
Do you know what happens to a player-typed string in your experience between the moment they press Enter and the moment it renders on another player's screen? If you are shipping on Roblox, you should, because the platform holds your experience accountable for that string, not the account that typed it.
Most Roblox tutorials stop at the mechanic. They will teach you a combat loop, an inventory grid, or a leaderboard, and never mention that the moment you let a player name their pet, their guild, or their base, you have shipped a publishing platform.
Roblox reports well over 80 million daily active users, and a large share of them are under 13, which is why the filtering rules are stricter than most developers expect. Moderation is the layer that decides whether your experience stays discoverable, and it is the one most teams schedule only after their first report spike.
Every string a player authors must be filtered server-side through TextService before any user sees it. Roblox filters TextChatService messages automatically; everything else — names, signs, notes — is your job.
What Roblox Filters For You, And What It Leaves To You
The platform does a meaningful amount of work before your code ever runs, and knowing exactly where that work stops is the difference between a compliant experience and a moderation strike. Here is the split as it actually exists in the engine:
- Usernames and display names. Both are moderated at account creation and at every change, so you can render
Player.NameandPlayer.DisplayNamewithout filtering them yourself. - TextChatService messages. Anything routed through the default chat system is filtered by Roblox per recipient before delivery, including whispers and team channels.
- Uploaded assets. Decals, audio, meshes, and animations pass automated and human review before they receive a usable asset ID.
- Everything else. Pet names, guild tags, sign text, custom emotes, and any string you move across a RemoteEvent are unfiltered until you filter them.
That last bullet is where nearly every moderation incident originates. Keep in mind that if a player can type it and another player can see it, you own the filtering call — and the policy makes no exception for text the author is currently the only one viewing.
How TextService Filtering Actually Works
Filtering on Roblox is a two-step call, and most broken implementations get the second step wrong. The first step produces a result object; the second step turns that object into a string for one specific viewer.
On the server, you call TextService:FilterStringAsync(text, fromUserId, Enum.TextFilterContext.PublicChat), which returns a TextFilterResult. That object is not a string, cannot be handed to a client, and does not by itself tell you whether anything was caught.
To render it, call GetNonChatStringForUserAsync(toUserId) for a single recipient, or GetNonChatStringForBroadcastAsync() when the same text goes to everyone. Use the broadcast form for signs and global boards, and the per-user form for anything targeted at one player.
FilterStringAsync returns a TextFilterResult, not a string. Call GetNonChatStringForUserAsync once per recipient, or GetNonChatStringForBroadcastAsync when the text is shown to everyone.
The Two Mistakes That Break Filtering
The first is filtering on the client. A LocalScript can call the API, however the result is trivially bypassed by anyone running an executor — the same class of problem covered in our guide to Roblox anti-exploit patterns, where the rule is identical: the server is the only authority.
The second is filtering once and reusing the output everywhere. Filtering strength scales with the recipient's account age and settings, so a string that returns clean for a 25-year-old may come back partially hashed for a 10-year-old, and the reverse never holds.
Note that both calls are web requests, which means both can yield, throttle, and throw. Wrap them in pcall and fail closed: if the filter errors, drop the text or substitute a placeholder rather than rendering the raw original.
Filtering Text You Store
Persistence is where filtering quietly goes wrong, because the write and the read happen on different days for different audiences. A guild name written today and read by a new under-13 player next month has to be filtered against that reader, not against the person who typed it.
The durable pattern, therefore, is to store the raw string and filter on read. Keep the original in your Roblox data store schema alongside the author's UserId, because fromUserId is a required argument and you will need it every single time you re-filter.
The exception is a display surface rendering for an unknown audience. For those, cache one broadcast-filtered copy next to the raw string so your Roblox leaderboard rendering does not fire a filter request per row per player.
What's more, you should filter before the write as a cheap rejection test. If the broadcast filter comes back with hash characters, tell the player their name was rejected at input time instead of letting them discover it hours later when nobody else can read their guild tag.
Store the raw string plus the author's UserId, then filter on read. Cache one broadcast-filtered copy for global surfaces like leaderboards so you are not issuing a filter request per row per viewer.
Moderating Player-Created Content Beyond Text
Text is the obvious surface, yet the harder problems in user-generated content are the ones that route around the filter entirely. A player who cannot type a slur will spell it with 12 parts on a baseplate, or paste an asset ID for a decal that was approved for a very different context.
Roblox moderates every uploaded decal, image, audio file, and mesh before it receives a usable asset ID, which removes the worst category of risk. What it does not do is decide whether an approved asset belongs in your experience, on a wall, at 40 studs tall.
Accordingly, if you accept asset IDs as input, gate them. Call MarketplaceService:GetProductInfo(assetId) to confirm the asset type and creator before applying it, and prefer a curated allowlist over open input for anything visible to other players.
Player-built structures need a different control, because you cannot statically analyze a build for offensive shape. The practical answer is a reporting path attached to every player-owned object, plus a fast way to delete both the object and the save slot behind it.
EditableImage and the runtime asset APIs raise the stakes further, since they let players compose imagery your review process never saw. Keep those surfaces behind an explicit publishing step so the resulting asset passes Roblox upload moderation before it becomes visible to anyone else.
Building In-Experience Reporting That Someone Will Actually Read
Roblox provides an abuse report flow in the platform menu, and it works — but it routes the account to Roblox's moderation team, and you never see the outcome. If you want to act on scams in your own trade window or griefing in your own base system, you need your own path.
A usable report system needs three pieces: a trigger the player can reach in under two taps, a server-side payload with enough context to adjudicate, and a destination a human checks on a schedule. Miss the third and you have built a very expensive placebo.
What The Report Payload Should Carry
Reports that arrive without context get ignored, because nobody will investigate "Player123 was mean" three days later. At minimum, include:
- Both UserIds. Names change, so the numeric UserId is the only stable key across a rename or a ban appeal.
- The JobId and PlaceId.
game.JobIdplus the place version tells you exactly which build and which server instance the incident happened on. - A server-side UTC timestamp. Use
os.time()on the server, never a client clock, so the report lines up with your log stream. - The category and the free-text reason. Filter that free-text field before it renders on a moderator's screen, and cap it at a few hundred characters.
- A short state snapshot. The last few trades, the current inventory hash, or the last 20 already-filtered chat lines — whatever your dispute type actually needs.
Route the payload out with HttpService to your own HTTPS endpoint. Roblox blocks requests to discord.com from game servers, so if Discord is where your moderators live, relay through a small service you control instead of posting the webhook directly.
A report is only actionable with both UserIds, the server JobId, a server-side UTC timestamp, and a filtered reason string. Roblox blocks discord.com from game servers, so relay through your own endpoint.
Turning Reports Into Actions
Enforcement is a ladder rather than a switch, and picking the wrong rung is how experiences lose players who would have corrected course after a warning. Match the response to your confidence level and to the cost of a false positive.
| Action | Mechanism | Scope | Use when |
|---|---|---|---|
| Rate limit | Server-side token bucket per UserId | Current server | Spam, remote flooding, chat repetition |
| Chat mute | TextChatService.ShouldDeliverCallback returns false | Per recipient | Harassment reported by one player |
| Feature lock | Flag on the player's session data | Current server | Trade scams, build abuse, exploit suspicion |
| Kick | Player:Kick(message) | Current server only | Stopping an in-progress disruption |
| Ban | Players:BanAsync with ApplyToUniverse | Every place in the universe | Confirmed, reviewed, repeat offenses |
Be aware that a kick is the weakest permanent-feeling action available to you. The player is back in roughly 20 seconds, usually angrier, so reserve it for interrupting live disruption rather than for punishment.
Players:BanAsync is the tool that changed this landscape, since it accepts a duration in seconds (or -1 for permanent), a display reason shown to the player, a private reason for your logs, and an ApplyToUniverse flag. Roblox enforces it at the join layer, which means you are no longer maintaining a ban table and checking it yourself in PlayerAdded.
Making Enforcement Stick Across Servers
Mutes and feature locks live in server memory, so they evaporate the moment the offender hops. If a player can dodge a 10-minute mute by rejoining, your mute is decorative.
Two mechanisms close that gap. Persist the moderation state next to the player's save data so it reloads on join, and broadcast the change with cross-server messaging via MessagingService so live servers apply it immediately.
Keep that broadcast payload small, because MessagingService caps a message at roughly 1 KB and throttles per-universe throughput. Send the UserId, the action, and an expiry timestamp; leave the evidence in your database where it belongs.
For enforcement initiated outside the game, the Roblox Open Cloud API surface exposes user restrictions and data store access, which lets a moderation dashboard ban an account without anyone opening Studio. That is what turns a volunteer moderator team into something that scales past one time zone.
Persist mutes and locks to the player's saved data, then broadcast the change over MessagingService so live servers apply it. Otherwise a rejoin clears the penalty in about 20 seconds.
How Do You Know Your Moderation Is Working?
Most teams measure moderation by the absence of complaints, which is the one signal that always arrives too late. Instrument it the way you would instrument any other subsystem.
Track four numbers weekly: filter rejection rate at input, reports per thousand sessions, median time from report to action, and the reversal rate on appeals. In fact, a rejection rate near zero usually means you are not filtering a surface you believe you are.
Additionally, log every filter failure separately from every filter hit. A spike in pcall failures means the filtering service is degraded and your fail-closed path has quietly become the user experience — you want that within minutes, not from a moderation review.
Finally, test with a second account in a live session rather than in Studio. Filtering behaves differently for a Studio test user than for a live under-13 client, and that per-recipient variation is exactly what unit tests will not catch.
A Pre-Launch Moderation Checklist
Run this before you flip the experience to public, and again after any update that adds a new text input. Each line maps to something above:
- Inventory every text input. Search your code for every RemoteEvent that accepts a string, and confirm each one hits the filter before it hits persistence or another client.
- Confirm all filtering is server-side. No LocalScript should be calling TextService for anything a second player will see.
- Wrap every filter call in pcall. Fail closed, and log the failure with the UserId and the surface name.
- Cap string length on the server. Enforce the limit in the handler, not just in the TextBox, so an executor cannot post a 40,000-character sign.
- Ship the report button. One tap from the player list, and one from any player-owned object.
- Rate limit the report remote. Your reporting endpoint is itself a spam surface if it accepts unlimited submissions.
- Write the appeal path. Decide who reviews bans and how a wrongly banned player reaches them before you issue the first one.
Structure all of this as a module rather than a scattering of call sites, following the same separation described in our notes on Luau scripting patterns. One moderation module with a filter function, a report function, and an enforce function is far easier to audit than 30 loose calls.
Trade and economy features generate the highest report volume of any system in most Roblox experiences, because that is where real value moves between players. If your game has an economy, read this alongside our guide to Roblox inventory trading systems and build the report hook directly into the trade window.
Frequently Asked Questions
Does Roblox automatically filter TextChatService messages?
Yes. Messages routed through TextChatService are filtered by Roblox before delivery, per recipient. Custom text — pet names, signs, team names — is not, and you must call FilterStringAsync yourself.
How do I moderate player-supplied image asset IDs?
Every uploaded decal is moderated by Roblox before it becomes usable, but you still gate which IDs load. Check MarketplaceService:GetProductInfo for the asset type and creator, and keep an allowlist for anything shown to other players.
How do I mute a player without kicking them?
Set TextChatService.ShouldDeliverCallback on the server to return false for messages from the muted sender. It runs per recipient, so you can mute one player for one target instead of silencing the whole server.
How do I ban a player from every server at once?
Use Players:BanAsync with ApplyToUniverse set to true and a Duration in seconds, or -1 for permanent. Roblox enforces it at the join layer, so you do not need your own cross-server ban check.
Where should in-experience reports be sent?
Roblox blocks HTTP requests to discord.com from game servers, so post reports to your own HTTPS endpoint and relay from there. Include the reporter, the accused, the server JobId, and a timestamp.
Moderation is the least glamorous system you will build and the one that decides whether your experience survives its first thousand-player day. Start with the filter calls, add the report path before launch, and keep the enforcement ladder short enough that a volunteer moderator can hold it in their head.
If you are building the surrounding systems, our coverage of server-authoritative anti-exploit design and durable data store patterns covers the two layers that moderation depends on most.
