diff --git a/client/css/post-upload.styl b/client/css/post-upload.styl
index 7bf9fbe..b9d18a5 100644
--- a/client/css/post-upload.styl
+++ b/client/css/post-upload.styl
@@ -9,9 +9,12 @@ $cancel-button-color = tomato
         margin: 0 auto
         text-align: left
 
-        &.inactive
-            input[type=submit]
-                display: none
+        &.inactive input[type=submit],
+        &.inactive .skip-duplicates
+        &.uploading input[type=submit],
+        &.uploading .skip-duplicates,
+        &:not(.uploading) .cancel
+            display: none
 
     .dropper-container
         margin: 0 auto
@@ -21,18 +24,17 @@ $cancel-button-color = tomato
 
     input[type=submit]
         margin-top: 1em
-        &[disabled]
-            display: none
 
     .cancel
         margin-top: 1em
         background: $cancel-button-color
         border-color: $cancel-button-color
-        &[disabled]
-            display: none
         &:focus
             border: 2px solid $text-color
 
+    .skip-duplicates
+        margin-left: 1em
+
     .messages
         margin-top: 1em
 
diff --git a/client/html/post_upload.tpl b/client/html/post_upload.tpl
index 1dcfba4..f1ed88f 100644
--- a/client/html/post_upload.tpl
+++ b/client/html/post_upload.tpl
@@ -2,8 +2,19 @@
     <form>
         <div class='dropper-container'></div>
 
-        <input type='submit' value='Upload all' class='submit'/>
-        <input type='button' value='Cancel' class='cancel'/>
+        <div class='control-strip'>
+            <input type='submit' value='Upload all' class='submit'/>
+
+            <span class='skip-duplicates'>
+                <%= ctx.makeCheckbox({
+                    text: 'Skip duplicates',
+                    name: 'skip-duplicates',
+                    checked: false,
+                }) %>
+            </span>
+
+            <input type='button' value='Cancel' class='cancel'/>
+        </div>
 
         <div class='messages'></div>
 
diff --git a/client/js/controllers/post_upload_controller.js b/client/js/controllers/post_upload_controller.js
index 4defd5e..3ec86a9 100644
--- a/client/js/controllers/post_upload_controller.js
+++ b/client/js/controllers/post_upload_controller.js
@@ -48,25 +48,36 @@ class PostUploadController {
         this._view.clearMessages();
 
         e.detail.uploadables.reduce((promise, uploadable) => {
-            return promise.then(
-                () => {
-                    let post = new Post();
-                    post.safety = uploadable.safety;
-                    if (uploadable.url) {
-                        post.newContentUrl = uploadable.url;
-                    } else {
-                        post.newContent = uploadable.file;
-                    }
-                    let modelPromise = post.save(uploadable.anonymous);
-                    this._lastPromise = modelPromise;
-                    return modelPromise
-                        .then(() => {
-                            this._view.removeUploadable(uploadable);
+            return promise.then(() => {
+                let post = new Post();
+                post.safety = uploadable.safety;
+                if (uploadable.url) {
+                    post.newContentUrl = uploadable.url;
+                } else {
+                    post.newContent = uploadable.file;
+                }
+
+                let modelPromise = post.save(uploadable.anonymous);
+                this._lastPromise = modelPromise;
+
+                return modelPromise
+                    .then(() => {
+                        this._view.removeUploadable(uploadable);
+                        return Promise.resolve();
+                    }).catch(errorMessage => {
+                        // XXX:
+                        // lame, API eats error codes so we need to match
+                        // messages instead
+                        if (e.detail.skipDuplicates &&
+                                errorMessage.match(/already uploaded/)) {
                             return Promise.resolve();
-                        });
-                });
-        }, Promise.resolve()).then(
-            () => {
+                        }
+                        return Promise.reject(errorMessage);
+                    });
+            });
+        }, Promise.resolve())
+
+            .then(() => {
                 misc.disableExitConfirmation();
                 const ctx = router.show('/posts');
                 ctx.controller.showSuccess('Posts uploaded.');
diff --git a/client/js/views/post_upload_view.js b/client/js/views/post_upload_view.js
index 98b8021..fd60f4e 100644
--- a/client/js/views/post_upload_view.js
+++ b/client/js/views/post_upload_view.js
@@ -137,7 +137,6 @@ class PostUploadView extends events.EventTarget {
         views.replaceContent(this._hostNode, template());
         views.syncScrollPosition();
 
-        this._enabled = true;
         this._cancelButtonNode.disabled = true;
 
         this._uploadables = new Map();
@@ -162,13 +161,13 @@ class PostUploadView extends events.EventTarget {
     enableForm() {
         views.enableForm(this._formNode);
         this._cancelButtonNode.disabled = true;
-        this._enabled = true;
+        this._formNode.classList.remove('uploading');
     }
 
     disableForm() {
         views.disableForm(this._formNode);
         this._cancelButtonNode.disabled = false;
-        this._enabled = false;
+        this._formNode.classList.add('uploading');
     }
 
     clearMessages() {
@@ -245,7 +244,7 @@ class PostUploadView extends events.EventTarget {
 
     _evtRemoveClick(e, uploadable) {
         e.preventDefault();
-        if (!this._enabled) {
+        if (this._uploading) {
             return;
         }
         this.removeUploadable(uploadable);
@@ -253,7 +252,7 @@ class PostUploadView extends events.EventTarget {
 
     _evtMoveUpClick(e, uploadable) {
         e.preventDefault();
-        if (!this._enabled) {
+        if (this._uploading) {
             return;
         }
         let sortedUploadables = this._getSortedUploadables();
@@ -268,7 +267,7 @@ class PostUploadView extends events.EventTarget {
 
     _evtMoveDownClick(e, uploadable) {
         e.preventDefault();
-        if (!this._enabled) {
+        if (this._uploading) {
             return;
         }
         let sortedUploadables = this._getSortedUploadables();
@@ -306,7 +305,10 @@ class PostUploadView extends events.EventTarget {
         this.dispatchEvent(
             new CustomEvent(
                 eventType,
-                {detail: {uploadables: this._getSortedUploadables()}}));
+                {detail: {
+                    uploadables: this._getSortedUploadables(),
+                    skipDuplicates: this._skipDuplicatesCheckboxNode.checked,
+                }}));
     }
 
     _createRowNode(uploadable) {
@@ -342,6 +344,10 @@ class PostUploadView extends events.EventTarget {
             rowNode.querySelector('.thumbnail').childNodes);
     }
 
+    get _uploading() {
+        return this._formNode.classList.contains('uploading');
+    }
+
     get _listNode() {
         return this._hostNode.querySelector('.uploadables-container');
     }
@@ -350,6 +356,10 @@ class PostUploadView extends events.EventTarget {
         return this._hostNode.querySelector('form');
     }
 
+    get _skipDuplicatesCheckboxNode() {
+        return this._hostNode.querySelector('form [name=skip-duplicates]');
+    }
+
     get _submitButtonNode() {
         return this._hostNode.querySelector('form [type=submit]');
     }