Chat/Filtering

Roblox has a chat filter that prohibits players from seeing or sending profanity and restricts personally identifiable information, which replaces the now-discontinued Safe Chat that was previously used to prevent young players from sending messages that were not pre-programmed.

Historically, Roblox used a hidden word blacklist that came bundled with the Roblox Player, stored in the file diogenes.fnt. Speaking any word contained in that list would usually render an instant Ban from the website, a disconnection from whatever game the user was playing at that moment and repeated infractions could lead to a termination. Only 13+ accounts could chat or post on the website and other players (including Guests) were restricted to the Safe Chat (Unless disabled in the account's respective Parent account).

Today, the text filter is provided by the CommunitySift service. Since CommunitySift uses multiple rules and text classification techniques to filter phrases, the lists in this article are not representative of the entire range of words that are filtered. The system is a controlled neural network, which is constantly studying what users say so it can learn and evolve with the language as new bypasses and idioms are created. Errors happen frequently, but the occurrence of such has diminished over time.

List of filtered words
The chat uses a predefined list of words to filter, and messages that match one of the words in this list will not be broadcasted to other players at all. Most words are explicit language, so if you are not comfortable with this then it is not recommended to expand either of the two lists.

This is the word blacklist used by Roblox, extracted from diogenes.fnt:


 * 4uck
 * @_@_@Fuck...Me
 * 69
 * Adolf Hitler
 * ass
 * ahole
 * anally
 * anus
 * ashole
 * asholes
 * asshole
 * assholes
 * asskisser
 * beastiality
 * beastility
 * bedridde
 * bestiality
 * bich
 * biches
 * bicth
 * bitc
 * bitch
 * bitcher
 * bitchers
 * bitches
 * bitchin
 * bitching
 * bitchs
 * blowjob
 * blowjobs
 * blyat
 * boner
 * bullshit
 * bulshit
 * blunts
 * buttfuck
 * buttfucker
 * butthair
 * buttsex
 * buttsecs
 * buttsecks
 * buttseks
 * chink
 * circlejerk
 * clit
 * c0nd0ms
 * cond0ms
 * c0ndoms
 * cock
 * cockporn
 * cocks
 * cocksuck
 * cocksucked
 * cocksucker
 * cocksucking
 * cocksucks
 * cok
 * condom
 * condoms
 * cooter
 * cum
 * cummer
 * cumming
 * cums
 * cumshot
 * cumshot
 * cunilingus
 * cunillingus
 * cunnilingus
 * cunt
 * cuntlick
 * cuntlicker
 * cuntlicking
 * cunts
 * cyberfuc
 * cyberfuck
 * cyberfucked
 * cyberfucker
 * cyberfuckers
 * cyberfucking
 * cyka
 * dick
 * dicks
 * dike
 * dildo
 * dildoshit
 * dildos
 * dildos
 * dipshit
 * discord
 * douche
 * douchebag
 * dyke
 * eat shit
 * ejaculate
 * ejaculated
 * ejaculates
 * ejaculating
 * ejaculatings
 * ejaculation
 * fag
 * faget
 * fagg
 * fagget
 * fagging
 * faggit
 * faggot
 * faggs
 * fagit
 * fagot
 * fagots
 * fags
 * fapper
 * fapping
 * fappin
 * fawk
 * fcking
 * felch
 * felatio
 * felatio
 * fellatio
 * fingerbang
 * fingerfuck
 * fingerfucked
 * fingerfucker
 * fingerfuckers
 * fingerfucking
 * fingerfucks
 * fistfuck
 * fistfucked
 * fistfucker
 * fistfuckers
 * fistfucking
 * fistfuckings
 * fistfucks
 * focking
 * fuck
 * fuck!
 * fucke
 * fucked
 * fucken
 * fucker
 * fuckers
 * fuckin
 * fucking
 * fuckings
 * fuckjew
 * fuckme
 * fucks
 * fucktard
 * fuckyou
 * fuk
 * fuker
 * fukin
 * fuking
 * fukk
 * fuks
 * furburger
 * fudge
 * gangbang
 * gangbanged
 * gangbangs
 * gaysex
 * gazongas
 * gazongers
 * gonads
 * gook
 * hardcoresex
 * hardon
 * hentai
 * hentais
 * Hitler
 * homo
 * hooker
 * horniest
 * horny
 * hotsex
 * hump
 * jackass
 * jackingoff
 * jackoff
 * jack-off
 * jap
 * jerk-off
 * jew
 * jism
 * jiz
 * jizm
 * jizz
 * kike
 * kkk
 * kys
 * kock
 * kondum
 * kondums
 * kum
 * kummer
 * kumming
 * kums
 * kunilingus
 * lesbo
 * lusting
 * ligma
 * master
 * merde
 * molest
 * mothafuck
 * mothafuck
 * mothafucka
 * mothafucka
 * mothafuckas
 * mothafuckas
 * mothafuckaz
 * mothafuckaz
 * mothafucked
 * mothafucked
 * mothafucker
 * mothafucker
 * mothafuckers
 * mothafuckers
 * mothafuckin
 * mothafuckin
 * mothafucking
 * mothafucking
 * mothafuckings
 * mothafuckings
 * mothafucks
 * mothafucks
 * motherfuck
 * motherfuck
 * motherfucked
 * motherfucker
 * motherfucker
 * motherfuckers
 * motherfuckers
 * motherfuckin
 * motherfuckin
 * motherfucking
 * motherfucking
 * motherfuckings
 * motherfuckings
 * motherfucks
 * motherfucks
 * nazi
 * nazism
 * nipples
 * niger
 * nigga
 * niggas
 * nigger
 * nigger
 * niggers
 * niggers
 * orgasim
 * orgasims
 * orgasm
 * orgasms
 * Osama Bin Laden
 * panty
 * pantys
 * pecker
 * penis
 * popporn
 * phonesex
 * phuked
 * phuking
 * phukked
 * phukking
 * phuk
 * phuks
 * phuq
 * pimp
 * pissoff
 * porn
 * porno
 * pornography
 * pornos
 * prick
 * pricks
 * prostitute
 * pusies
 * pussies
 * pussy
 * pussys
 * pusy
 * pusys
 * quackity
 * queer
 * queef
 * r@pe
 * r@ped
 * rape
 * raped
 * raping
 * schlong
 * sex
 * sexx
 * sexy
 * sexxx
 * sheet
 * sheetopaper
 * shit
 * shitfull
 * shiting
 * shitings
 * shits
 * shitted
 * shitter
 * shitters
 * shitting
 * shittings
 * shitty
 * shity
 * sixnine
 * Sixty-nine
 * Sixty Nine
 * slut
 * sluts
 * smut
 * snatch
 * sodomite
 * sodomize
 * sodomizer
 * sodomy
 * spunk
 * tramp
 * twat
 * underwear
 * underwears
 * vagina
 * virginia
 * vibrator
 * wan
 * wang
 * wank
 * wanker
 * wetback
 * cumshot
 * whore
 * wop
 * wtf

A different filter is used for messages in games and on the website, when they are not in in-game chat, which replaces letters of words that are filtered by the pound (#) sign instead of blocking the messages completely. This filter list is not public.

This is a list of the words that are known to be filtered:


 * 69
 * alcohol
 * alcoholic beverages of all kind (Carlsberg, Merlot etc.)
 * allahu akbar
 * Adopt and raise a cute kid
 * anally
 * anus
 * asshole
 * bestiality
 * bitch
 * bitches
 * bitching
 * bed
 * blowjob
 * boner
 * bullshit
 * cigarette
 * cigarettes
 * chink
 * cock
 * cocks
 * condom
 * condoms
 * cum
 * cums
 * cunnilingus
 * cunt
 * cunts
 * dick
 * dicks
 * dike
 * dildo
 * dildos
 * douche
 * drink bleach
 * drug
 * drugs of most kind (nicotine, cocaine, etc.)
 * dyke
 * dysentary
 * ejaculate
 * ejaculated
 * ejaculates
 * ejaculating
 * ejaculation
 * fag
 * fagging
 * faggot
 * fagot
 * fagots
 * fags
 * fellatio
 * fox
 * fuck
 * fucked
 * fucking
 * fucks
 * freak
 * frick
 * frack
 * genocide
 * Germany
 * gonads
 * gook
 * hitler
 * homo
 * hooker
 * horniest
 * horny
 * hump
 * IP address
 * JuliusColes
 * Julius Coles
 * JaredValdez
 * jackass
 * jap
 * jew
 * kike
 * knuckles
 * kunt
 * kunts
 * lusting
 * ligma
 * mature
 * molest
 * naughty
 * naked
 * nazi
 * nig
 * nigger
 * niggers
 * orgasm
 * orgasms
 * pecker
 * penis
 * pen15
 * phone
 * pimp
 * piss off
 * porn
 * porno
 * pornography
 * pornos
 * pregnant
 * Preston
 * prick
 * pricks
 * prostitute
 * pussies
 * pussy
 * quackity
 * queer
 * rape
 * raped
 * R0cu
 * sex
 * shit
 * shits
 * shitted
 * shitting
 * slut
 * sluts
 * smut
 * snatch
 * sodomite
 * sodomy
 * spunk
 * succ
 * Tomlinson
 * Thompson
 * tramp
 * twat
 * U
 * vagina
 * vibrator
 * wang
 * weed
 * wetback
 * whore
 * wop
 * bhenchod
 * madarchod
 * asswipe
 * fick
 * frack
 * kock
 * kocks
 * kraut
 * krauts
 * kunt
 * kunts
 * kunts
 * s3x
 * suckahs
 * suckers
 * CowCow
 * Quackity
 * Certain names such as Tomlinson
 * erik.cassel (only in certain places (library search, player search))

False positives
The filtering system, at times, may detect false positives in sentences that could be considered otherwise acceptable. Words used in common sentences such as "the", "my", "town" sometimes get picked up by the filter and get censored. The number of hits has reduced in the last years, as the filter evolved to detect what is a normal conversation and what is not, based on feedback given by Roblox Staff and by common users, although false positives still happen frequently. Those are most noticeable when searching through the catalog or when looking for a username.

Blacklisted Numbers
In February 2017, < 13 accounts |had all forms of numbers blacklisted from being seen and sent permanently for security reasons - namely, to avoid underage users sending messages with personally identifiable information such as age, addresses and telephone numbers. This has caused quite a commotion in the Roblox community, and criticism flew around from all parts.

Controversies
During some time, LGBT culture words such as "gay", "homosexual", "lesbian", "bisexual", "transsexual" and the alike were temporarily blacklisted by the filter automatically, severely upsetting many people. his has since been fixed, and now the filter only blocks these words when used in negative connotations.