diff --git a/lemmy_utils/src/utils.rs b/lemmy_utils/src/utils.rs
index 87aad574a..eeaccd5b0 100644
--- a/lemmy_utils/src/utils.rs
+++ b/lemmy_utils/src/utils.rs
@@ -4,6 +4,7 @@ use chrono::{DateTime, FixedOffset, Local, NaiveDateTime};
 use itertools::Itertools;
 use rand::{distributions::Alphanumeric, thread_rng, Rng};
 use regex::{Regex, RegexBuilder};
+use url::Url;
 
 lazy_static! {
 static ref EMAIL_REGEX: Regex = Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$").unwrap();
@@ -128,3 +129,14 @@ pub fn get_ip(conn_info: &ConnectionInfo) -> String {
     .unwrap_or("127.0.0.1")
     .to_string()
 }
+
+pub fn is_valid_url_opt(value: &Option<String>) -> Result<(), APIError> {
+  if let Some(v) = value {
+    match Url::parse(v) {
+      Ok(_t) => Ok(()),
+      Err(_e) => Err(APIError::err("invalid_url")),
+    }
+  } else {
+    Ok(())
+  }
+}
diff --git a/src/api/comment.rs b/src/api/comment.rs
index 69853c3e7..650df43b3 100644
--- a/src/api/comment.rs
+++ b/src/api/comment.rs
@@ -11,6 +11,7 @@ use crate::{
   LemmyContext,
 };
 use actix_web::web::Data;
+use ammonia::clean_text;
 use lemmy_db::{
   comment::*,
   comment_view::*,
@@ -54,7 +55,7 @@ impl Perform for CreateComment {
     let content_slurs_removed = remove_slurs(&data.content.to_owned());
 
     let comment_form = CommentForm {
-      content: content_slurs_removed,
+      content: clean_text(&content_slurs_removed),
       parent_id: data.parent_id.to_owned(),
       post_id: data.post_id,
       creator_id: user.id,
@@ -364,7 +365,7 @@ impl Perform for RemoveComment {
       mod_user_id: user.id,
       comment_id: data.edit_id,
       removed: Some(removed),
-      reason: data.reason.to_owned(),
+      reason: data.reason.as_ref().map(|r| clean_text(r)),
     };
     blocking(context.pool(), move |conn| {
       ModRemoveComment::create(conn, &form)
diff --git a/src/api/community.rs b/src/api/community.rs
index 77a945a64..c1843ead3 100644
--- a/src/api/community.rs
+++ b/src/api/community.rs
@@ -4,6 +4,7 @@ use crate::{
   LemmyContext,
 };
 use actix_web::web::Data;
+use ammonia::clean_text;
 use anyhow::Context;
 use lemmy_db::{
   comment::Comment,
@@ -35,7 +36,13 @@ use lemmy_structs::{
 use lemmy_utils::{
   apub::{generate_actor_keypair, make_apub_endpoint, EndpointType},
   location_info,
-  utils::{check_slurs, check_slurs_opt, is_valid_community_name, naive_from_unix},
+  utils::{
+    check_slurs,
+    check_slurs_opt,
+    is_valid_community_name,
+    is_valid_url_opt,
+    naive_from_unix,
+  },
   APIError,
   ConnectionId,
   LemmyError,
@@ -139,10 +146,13 @@ impl Perform for CreateCommunity {
     // When you create a community, make sure the user becomes a moderator and a follower
     let keypair = generate_actor_keypair()?;
 
+    is_valid_url_opt(&data.icon)?;
+    is_valid_url_opt(&data.banner)?;
+
     let community_form = CommunityForm {
-      name: data.name.to_owned(),
-      title: data.title.to_owned(),
-      description: data.description.to_owned(),
+      name: clean_text(&data.name),
+      title: clean_text(&data.title),
+      description: data.description.as_ref().map(|d| clean_text(d)),
       icon: Some(data.icon.to_owned()),
       banner: Some(data.banner.to_owned()),
       category_id: data.category_id,
@@ -233,10 +243,13 @@ impl Perform for EditCommunity {
     let icon = diesel_option_overwrite(&data.icon);
     let banner = diesel_option_overwrite(&data.banner);
 
+    is_valid_url_opt(&data.icon)?;
+    is_valid_url_opt(&data.banner)?;
+
     let community_form = CommunityForm {
-      name: read_community.name,
-      title: data.title.to_owned(),
-      description: data.description.to_owned(),
+      name: clean_text(&read_community.name),
+      title: clean_text(&data.title),
+      description: data.description.as_ref().map(|d| clean_text(d)),
       icon,
       banner,
       category_id: data.category_id.to_owned(),
@@ -375,7 +388,7 @@ impl Perform for RemoveCommunity {
       mod_user_id: user.id,
       community_id: data.edit_id,
       removed: Some(removed),
-      reason: data.reason.to_owned(),
+      reason: data.reason.as_ref().map(|r| clean_text(r)),
       expires,
     };
     blocking(context.pool(), move |conn| {
@@ -611,7 +624,7 @@ impl Perform for BanFromCommunity {
       mod_user_id: user.id,
       other_user_id: data.user_id,
       community_id: data.community_id,
-      reason: data.reason.to_owned(),
+      reason: data.reason.as_ref().map(|r| clean_text(r)),
       banned: Some(data.ban),
       expires,
     };
diff --git a/src/api/post.rs b/src/api/post.rs
index ef5409d1f..ed589796d 100644
--- a/src/api/post.rs
+++ b/src/api/post.rs
@@ -5,6 +5,7 @@ use crate::{
   LemmyContext,
 };
 use actix_web::web::Data;
+use ammonia::clean_text;
 use lemmy_db::{
   comment_view::*,
   community_view::*,
@@ -67,9 +68,9 @@ impl Perform for CreatePost {
       fetch_iframely_and_pictrs_data(context.client(), data.url.to_owned()).await;
 
     let post_form = PostForm {
-      name: data.name.trim().to_owned(),
+      name: clean_text(&data.name.trim()),
       url: data.url.to_owned(),
-      body: data.body.to_owned(),
+      body: data.body.as_ref().map(|b| clean_text(&b)),
       community_id: data.community_id,
       creator_id: user.id,
       removed: None,
@@ -379,9 +380,9 @@ impl Perform for EditPost {
       fetch_iframely_and_pictrs_data(context.client(), data.url.to_owned()).await;
 
     let post_form = PostForm {
-      name: data.name.trim().to_owned(),
+      name: clean_text(&data.name.trim()),
       url: data.url.to_owned(),
-      body: data.body.to_owned(),
+      body: data.body.as_ref().map(|b| clean_text(b)),
       nsfw: data.nsfw,
       creator_id: orig_post.creator_id.to_owned(),
       community_id: orig_post.community_id,
@@ -527,7 +528,7 @@ impl Perform for RemovePost {
       mod_user_id: user.id,
       post_id: data.edit_id,
       removed: Some(removed),
-      reason: data.reason.to_owned(),
+      reason: data.reason.as_ref().map(|r| clean_text(r)),
     };
     blocking(context.pool(), move |conn| {
       ModRemovePost::create(conn, &form)
diff --git a/src/api/site.rs b/src/api/site.rs
index 3ff1e49d0..ac5561a04 100644
--- a/src/api/site.rs
+++ b/src/api/site.rs
@@ -5,6 +5,7 @@ use crate::{
   LemmyContext,
 };
 use actix_web::web::Data;
+use ammonia::clean_text;
 use anyhow::Context;
 use lemmy_db::{
   category::*,
@@ -31,7 +32,7 @@ use lemmy_structs::{
 use lemmy_utils::{
   location_info,
   settings::Settings,
-  utils::{check_slurs, check_slurs_opt},
+  utils::{check_slurs, check_slurs_opt, is_valid_url_opt},
   APIError,
   ConnectionId,
   LemmyError,
@@ -155,9 +156,12 @@ impl Perform for CreateSite {
     // Make sure user is an admin
     is_admin(context.pool(), user.id).await?;
 
+    is_valid_url_opt(&data.icon)?;
+    is_valid_url_opt(&data.banner)?;
+
     let site_form = SiteForm {
-      name: data.name.to_owned(),
-      description: data.description.to_owned(),
+      name: clean_text(&data.name),
+      description: data.description.as_ref().map(|d| clean_text(d)),
       icon: Some(data.icon.to_owned()),
       banner: Some(data.banner.to_owned()),
       creator_id: user.id,
@@ -197,12 +201,15 @@ impl Perform for EditSite {
 
     let found_site = blocking(context.pool(), move |conn| Site::read(conn, 1)).await??;
 
+    is_valid_url_opt(&data.icon)?;
+    is_valid_url_opt(&data.banner)?;
+
     let icon = diesel_option_overwrite(&data.icon);
     let banner = diesel_option_overwrite(&data.banner);
 
     let site_form = SiteForm {
-      name: data.name.to_owned(),
-      description: data.description.to_owned(),
+      name: clean_text(&data.name.to_owned()),
+      description: data.description.as_ref().map(|d| clean_text(d)),
       icon,
       banner,
       creator_id: found_site.creator_id,
diff --git a/src/api/user.rs b/src/api/user.rs
index 630f816de..7bc1a95f2 100644
--- a/src/api/user.rs
+++ b/src/api/user.rs
@@ -5,6 +5,7 @@ use crate::{
   LemmyContext,
 };
 use actix_web::web::Data;
+use ammonia::clean_text;
 use anyhow::Context;
 use bcrypt::verify;
 use captcha::{gen, Difficulty};
@@ -55,6 +56,7 @@ use lemmy_utils::{
     check_slurs,
     generate_random_string,
     is_valid_preferred_username,
+    is_valid_url_opt,
     is_valid_username,
     naive_from_unix,
     remove_slurs,
@@ -160,11 +162,12 @@ impl Perform for Register {
     if !is_valid_username(&data.username) {
       return Err(APIError::err("invalid_username").into());
     }
+    let email = data.email.as_ref().map(|e| clean_text(e));
 
     // Register the new user
     let user_form = UserForm {
-      name: data.username.to_owned(),
-      email: Some(data.email.to_owned()),
+      name: clean_text(&data.username),
+      email: Some(email),
       matrix_user_id: None,
       avatar: None,
       banner: None,
@@ -217,7 +220,7 @@ impl Perform for Register {
         Err(_e) => {
           let default_community_name = "main";
           let community_form = CommunityForm {
-            name: default_community_name.to_string(),
+            name: clean_text(default_community_name),
             title: "The Default Community".to_string(),
             description: Some("The Default Community".to_string()),
             category_id: 1,
@@ -340,7 +343,7 @@ impl Perform for SaveUserSettings {
     let bio = match &data.bio {
       Some(bio) => {
         if bio.chars().count() <= 300 {
-          Some(bio.to_owned())
+          Some(clean_text(&bio.to_owned()))
         } else {
           return Err(APIError::err("bio_length_overflow").into());
         }
@@ -350,7 +353,11 @@ impl Perform for SaveUserSettings {
 
     let avatar = diesel_option_overwrite(&data.avatar);
     let banner = diesel_option_overwrite(&data.banner);
-    let email = diesel_option_overwrite(&data.email);
+    let email = data.email.as_ref().map(|e| clean_text(e));
+    let email = diesel_option_overwrite(&email);
+
+    is_valid_url_opt(&data.avatar)?;
+    is_valid_url_opt(&data.banner)?;
 
     // The DB constraint should stop too many characters
     let preferred_username = match &data.preferred_username {
@@ -397,9 +404,9 @@ impl Perform for SaveUserSettings {
     };
 
     let user_form = UserForm {
-      name: read_user.name,
+      name: clean_text(&read_user.name),
       email,
-      matrix_user_id: data.matrix_user_id.to_owned(),
+      matrix_user_id: data.matrix_user_id.as_ref().map(|m| clean_text(m)),
       avatar,
       banner,
       password_encrypted,
@@ -654,7 +661,7 @@ impl Perform for BanUser {
     let form = ModBanForm {
       mod_user_id: user.id,
       other_user_id: data.user_id,
-      reason: data.reason.to_owned(),
+      reason: data.reason.as_ref().map(|r| clean_text(r)),
       banned: Some(data.ban),
       expires,
     };
@@ -983,7 +990,7 @@ impl Perform for CreatePrivateMessage {
     let content_slurs_removed = remove_slurs(&data.content.to_owned());
 
     let private_message_form = PrivateMessageForm {
-      content: content_slurs_removed.to_owned(),
+      content: clean_text(&content_slurs_removed),
       creator_id: user.id,
       recipient_id: data.recipient_id,
       deleted: None,