diff --git a/src/error.rs b/src/error.rs
index 5d6da93..bac192a 100755
--- a/src/error.rs
+++ b/src/error.rs
@@ -22,7 +22,7 @@ pub enum NekrochanError {
     CapcodeFormatError,
     #[error("E-mail nesmí mít více než 256 znaků.")]
     EmailFormatError,
-    #[error("Obsah nesmí mít více než 4000 znaků")]
+    #[error("Obsah nesmí mít více než 10000 znaků.")]
     ContentFormatError,
     #[error("Nástěnka /{}/ neexistuje.", .0)]
     BoardNotFound(String),
@@ -30,6 +30,8 @@ pub enum NekrochanError {
     AccountNotFound(String),
     #[error("Příspěvek /{}/{} neexistuje.", .0, .1)]
     PostNotFound(String, i32),
+    #[error("Žádný takový ban pro tuto IP adresu neexistuje.")]
+    BanNotFound,
     #[error("Nedostatečná oprávnění.")]
     InsufficientPermissionError,
     #[error("Nesprávné přihlašovací údaje.")]
@@ -70,6 +72,10 @@ pub enum NekrochanError {
     FileLimitError(usize),
     #[error("Nesprávné heslo pro příspěvek #{}.", .0)]
     IncorrectPasswordError(i32),
+    #[error("Tento ban už byl odvolán.")]
+    AlreadyAppealedError,
+    #[error("Tento ban nelze odvolat.")]
+    UnappealableError,
     // 500
     #[error("Nadnástěnka nebyla inicializována.")]
     OverboardError,
@@ -193,41 +199,45 @@ impl From<tokio::task::JoinError> for NekrochanError {
 impl ResponseError for NekrochanError {
     fn status_code(&self) -> StatusCode {
         match self {
-            NekrochanError::FileError(_, _) => StatusCode::BAD_REQUEST,
-            NekrochanError::UsernameFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::PasswordFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::IdFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::BoardNameFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::DescriptionFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::PostNameFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::CapcodeFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::EmailFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::ContentFormatError => StatusCode::BAD_REQUEST,
-            NekrochanError::BoardNotFound(_) => StatusCode::NOT_FOUND,
-            NekrochanError::AccountNotFound(_) => StatusCode::NOT_FOUND,
-            NekrochanError::PostNotFound(_, _) => StatusCode::NOT_FOUND,
-            NekrochanError::InsufficientPermissionError => StatusCode::FORBIDDEN,
-            NekrochanError::IncorrectCredentialError => StatusCode::UNAUTHORIZED,
-            NekrochanError::InvalidPageError => StatusCode::NOT_FOUND,
-            NekrochanError::InvalidAuthError => StatusCode::NOT_FOUND,
-            NekrochanError::NotLoggedInError => StatusCode::UNAUTHORIZED,
-            NekrochanError::OwnerDeletionError => StatusCode::FORBIDDEN,
+            NekrochanError::FileError(_, _)
+            | NekrochanError::UsernameFormatError
+            | NekrochanError::PasswordFormatError
+            | NekrochanError::IdFormatError
+            | NekrochanError::BoardNameFormatError
+            | NekrochanError::DescriptionFormatError
+            | NekrochanError::PostNameFormatError
+            | NekrochanError::CapcodeFormatError
+            | NekrochanError::EmailFormatError
+            | NekrochanError::ContentFormatError
+            | NekrochanError::ReplyReplyError
+            | NekrochanError::NoContentError
+            | NekrochanError::NoFileError
+            | NekrochanError::EmptyPostError
+            | NekrochanError::RequiredCaptchaError
+            | NekrochanError::SolvedCaptchaError
+            | NekrochanError::NoPostsError
+            | NekrochanError::FileLimitError(_)
+            | NekrochanError::AlreadyAppealedError
+            | NekrochanError::UnappealableError => StatusCode::BAD_REQUEST,
+            NekrochanError::BoardNotFound(_)
+            | NekrochanError::AccountNotFound(_)
+            | NekrochanError::PostNotFound(_, _)
+            | NekrochanError::BanNotFound
+            | NekrochanError::InvalidPageError
+            | NekrochanError::InvalidAuthError => StatusCode::NOT_FOUND,
+            NekrochanError::InsufficientPermissionError
+            | NekrochanError::ReplyLimitError
+            | NekrochanError::ThreadLockError
+            | NekrochanError::BoardLockError(_)
+            | NekrochanError::OwnerDeletionError => StatusCode::FORBIDDEN,
+            NekrochanError::IncorrectCredentialError
+            | NekrochanError::NotLoggedInError
+            | NekrochanError::IncorrectCaptchaError
+            | NekrochanError::IncorrectPasswordError(_) => StatusCode::UNAUTHORIZED,
             NekrochanError::HeaderError(_) => StatusCode::BAD_GATEWAY,
-            NekrochanError::BoardLockError(_) => StatusCode::FORBIDDEN,
-            NekrochanError::ThreadLockError => StatusCode::FORBIDDEN,
-            NekrochanError::ReplyReplyError => StatusCode::BAD_REQUEST,
-            NekrochanError::ReplyLimitError => StatusCode::FORBIDDEN,
-            NekrochanError::NoContentError => StatusCode::BAD_REQUEST,
-            NekrochanError::NoFileError => StatusCode::BAD_REQUEST,
-            NekrochanError::EmptyPostError => StatusCode::BAD_REQUEST,
-            NekrochanError::RequiredCaptchaError => StatusCode::BAD_REQUEST,
-            NekrochanError::IncorrectCaptchaError => StatusCode::UNAUTHORIZED,
-            NekrochanError::SolvedCaptchaError => StatusCode::BAD_REQUEST,
-            NekrochanError::NoPostsError => StatusCode::BAD_REQUEST,
-            NekrochanError::FileLimitError(_) => StatusCode::BAD_REQUEST,
-            NekrochanError::IncorrectPasswordError(_) => StatusCode::UNAUTHORIZED,
-            NekrochanError::OverboardError => StatusCode::INTERNAL_SERVER_ERROR,
-            NekrochanError::InternalError => StatusCode::INTERNAL_SERVER_ERROR,
+            NekrochanError::OverboardError | NekrochanError::InternalError => {
+                StatusCode::INTERNAL_SERVER_ERROR
+            }
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 4900ccd..2bdc35a 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -71,6 +71,7 @@ async fn run() -> Result<(), Error> {
             .service(web::actions::user_post_actions::user_post_actions)
             .service(web::actions::staff_post_actions::staff_post_actions)
             .service(web::actions::report_posts::report_posts)
+            .service(web::actions::appeal_ban::appeal_ban)
             .service(web::login::login_get)
             .service(web::login::login_post)
             .service(web::logout::logout)
diff --git a/src/web/actions/appeal_ban.rs b/src/web/actions/appeal_ban.rs
new file mode 100644
index 0000000..b6777a6
--- /dev/null
+++ b/src/web/actions/appeal_ban.rs
@@ -0,0 +1,54 @@
+use actix_web::{post, web::Data, HttpRequest, HttpResponse};
+use serde::Deserialize;
+
+use super::ActionTemplate;
+use crate::{
+    ctx::Ctx,
+    db::models::Ban,
+    error::NekrochanError,
+    qsform::QsForm,
+    web::{
+        tcx::{ip_from_req, TemplateCtx},
+        template_response,
+    },
+};
+
+#[derive(Deserialize)]
+pub struct AppealBanForm {
+    pub id: i32,
+    pub appeal: String,
+}
+
+#[post("/actions/appeal-ban")]
+pub async fn appeal_ban(
+    ctx: Data<Ctx>,
+    req: HttpRequest,
+    QsForm(form): QsForm<AppealBanForm>,
+) -> Result<HttpResponse, NekrochanError> {
+    let tcx = TemplateCtx::new(&ctx, &req).await?;
+    let (ip, _) = ip_from_req(&req)?;
+
+    let ban = Ban::read_by_id(&ctx, form.id)
+        .await?
+        .ok_or(NekrochanError::BanNotFound)?;
+
+    if !ban.ip_range.contains(ip) {
+        return Err(NekrochanError::BanNotFound);
+    }
+
+    if ban.appeal.is_some() {
+        return Err(NekrochanError::AlreadyAppealedError);
+    }
+
+    if !ban.appealable {
+        return Err(NekrochanError::UnappealableError);
+    }
+
+    let appeal = form.appeal.trim().into();
+    ban.update_appeal(&ctx, appeal).await?;
+
+    template_response(&ActionTemplate {
+        tcx,
+        response: "Ban byl úspěšně odvolán.".into(),
+    })
+}
diff --git a/src/web/actions/create_post.rs b/src/web/actions/create_post.rs
index a0c819a..2cdbf05 100644
--- a/src/web/actions/create_post.rs
+++ b/src/web/actions/create_post.rs
@@ -159,7 +159,7 @@ pub async fn create_post(
         return Err(NekrochanError::NoContentError);
     }
 
-    if content_nomarkup.len() > 4000 {
+    if content_nomarkup.len() > 10000 {
         return Err(NekrochanError::ContentFormatError);
     }
 
diff --git a/src/web/actions/mod.rs b/src/web/actions/mod.rs
index f5a27e6..66aa05c 100644
--- a/src/web/actions/mod.rs
+++ b/src/web/actions/mod.rs
@@ -4,6 +4,7 @@ use super::tcx::TemplateCtx;
 use crate::{ctx::Ctx, db::models::Post};
 
 pub mod create_post;
+pub mod appeal_ban;
 pub mod report_posts;
 pub mod staff_post_actions;
 pub mod user_post_actions;
diff --git a/templates/banned.html b/templates/banned.html
index bc7aa15..3b3c419 100644
--- a/templates/banned.html
+++ b/templates/banned.html
@@ -44,6 +44,7 @@
                 {% else %}
                     <b>Můžeš se pokusit svůj ban odvolat:</b>
                     <form method="post" action="/actions/appeal-ban">
+                        <input name="id" type="hidden" value="{{ ban.id }}" />
                         <table class="form-table">
                             <tr>
                                 <td class="label">Odvolání</td>