diff --git a/tools/server/webui/src/lib/components/app/chat/ChatSettings/CustomWidthCombobox.svelte b/tools/server/webui/src/lib/components/app/chat/ChatSettings/CustomWidthCombobox.svelte
index 86de4c57d6..b3873f7058 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatSettings/CustomWidthCombobox.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatSettings/CustomWidthCombobox.svelte
@@ -3,6 +3,7 @@
 	import * as Command from '$lib/components/ui/command';
 	import * as Popover from '$lib/components/ui/popover';
 	import { Button } from '$lib/components/ui/button';
+	import { Input } from '$lib/components/ui/input';
 	import { cn } from '$lib/components/ui/utils';
 	import { tick } from 'svelte';
 	import { CUSTOM_WIDTH_PRESETS } from '$lib/utils/chat-width';
@@ -14,20 +15,41 @@
 	}
 
 	let { value = $bindable(''), onChange, disabled = false }: Props = $props();
+	console.log('Rendering CustomWidthCombobox with value:', value);
 
 	let open = $state(false);
+	let showCustomPixelInput = $state(false);
+	let customPixelValue = $state('');
+	let invalidCustomPixel = $state(false);
+
 	let triggerRef = $state<HTMLButtonElement>(null!);
-    console.log("Rendering CustomWidthCombobox with value:", value);
+	let customPixelInputRef = $state<HTMLInputElement>(null!);
 
 	const widthPresets = Object.entries(CUSTOM_WIDTH_PRESETS).map(([key, pixelValue]) => ({
 		value: key,
 		label: `${key} (${pixelValue}px)`
 	}));
 
+	const isValueANumber = $derived.by(() => {
+		const numValue = Number(value);
+		if (!isNaN(numValue) && numValue > 0) {
+			return true;
+		}
+		return false;
+	});
+
 	const displayValue = $derived.by(() => {
+		if (showCustomPixelInput) {
+			return 'Set pixel value';
+		}
+
 		const selectedWidthPreset = widthPresets.find((preset) => preset.value === value);
 		if (selectedWidthPreset) return selectedWidthPreset.label;
 
+		if (isValueANumber) {
+			return `Custom (${Number(value)}px)`;
+		}
+
 		return 'Select width...';
 	});
 
@@ -40,9 +62,50 @@
 
 	function handleSelectPreset(newValue: string) {
 		value = newValue;
+		showCustomPixelInput = false;
 		onChange(newValue);
 		closeAndFocusTrigger();
 	}
+
+	function handleShowCustomPixelInput() {
+		open = false;
+		showCustomPixelInput = true;
+
+		tick().then(() => {
+			if (customPixelInputRef) customPixelInputRef.focus();
+		});
+	}
+
+	function handleCancelCustomPixelInput() {
+		showCustomPixelInput = false;
+		customPixelValue = '';
+	}
+
+	function handleKeydown(e: KeyboardEvent) {
+		if (e.key === 'Enter') {
+			e.preventDefault();
+			handleSaveCustomPixelInput();
+		}
+	}
+
+	function handleSaveCustomPixelInput() {
+		if (!customPixelValue) {
+			invalidCustomPixel = true;
+			return;
+		}
+
+		const number = Number(customPixelValue);
+		const isValid = !isNaN(number) && number >= 300 && number <= 10000;
+
+		if (isValid) {
+			value = String(number);
+			onChange(String(number));
+			invalidCustomPixel = false;
+			showCustomPixelInput = false;
+		} else {
+			invalidCustomPixel = true;
+		}
+	}
 </script>
 
 <div class="flex w-full flex-col gap-2">
@@ -70,10 +133,25 @@
 					<Command.Empty>No presets found.</Command.Empty>
 
 					<Command.Group value="width-presets">
+						<Command.Item value="set-custom-pixel-value" onSelect={handleShowCustomPixelInput}>
+							<Check
+								class={cn(
+									'mr-2 h-4 w-4',
+									showCustomPixelInput || isValueANumber ? 'opacity-100' : 'opacity-0'
+								)}
+							/>
+							Set pixel value
+						</Command.Item>
+
+						<Command.Separator class="my-1" />
+
 						{#each widthPresets as preset (preset.value)}
 							<Command.Item value={preset.value} onSelect={() => handleSelectPreset(preset.value)}>
 								<Check
-									class={cn('mr-2 h-4 w-4', value === preset.value ? 'opacity-100' : 'opacity-0')}
+									class={cn(
+										'mr-2 h-4 w-4',
+										value === preset.value && !showCustomPixelInput ? 'opacity-100' : 'opacity-0'
+									)}
 								/>
 								{preset.label}
 							</Command.Item>
@@ -83,4 +161,33 @@
 			</Command.Root>
 		</Popover.Content>
 	</Popover.Root>
+
+	{#if showCustomPixelInput}
+		<div class="animate-in fade-in slide-in-from-top-1 flex items-center gap-2 duration-200">
+			<Input
+				bind:ref={customPixelInputRef}
+				bind:value={customPixelValue}
+				onkeydown={handleKeydown}
+				type="number"
+				placeholder="e.g. 800"
+				class={cn(
+					'flex-1',
+					invalidCustomPixel && 'border-destructive focus-visible:ring-destructive'
+				)}
+				step="1"
+				min="300"
+				max="10000"
+			/>
+			<Button onclick={handleSaveCustomPixelInput}>Save</Button>
+			<Button variant="outline" onclick={handleCancelCustomPixelInput}>Cancel</Button>
+		</div>
+		<p
+			class={cn(
+				'ml-1 text-[0.8rem]',
+				invalidCustomPixel ? 'text-destructive' : 'text-muted-foreground'
+			)}
+		>
+			Enter a value between 300 and 10000 pixels.
+		</p>
+	{/if}
 </div>