diff --git a/web/src/lib/components/SchemaResultTile.svelte b/web/src/lib/components/SchemaResultTile.svelte
index 47ffe84..b8bb70a 100644
--- a/web/src/lib/components/SchemaResultTile.svelte
+++ b/web/src/lib/components/SchemaResultTile.svelte
@@ -1,12 +1,13 @@
 <script lang="ts">
 	import { toDataUrl } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
-	import type { FileResult } from "$lib/registry";
-	import { Check, RefreshCw } from "@lucide/svelte";
+	import type { FileResult, ResultKind } from "$lib/registry";
+	import { Check } from "@lucide/svelte";
 	import SchemaTextResult from "./SchemaTextResult.svelte";
+	import PreviewTile from "./layout/PreviewTile.svelte";
 
 	interface Props {
-		resultKind?: "image" | "text" | "verdict" | "files";
+		resultKind?: ResultKind;
 		result: PixelImage | null;
 		fileResult?: FileResult | null;
 		textResult?: string | null;
@@ -33,20 +34,13 @@
 				}))
 			: [],
 	);
+
+	let parts = $derived(
+		resultKind === "files" && fileResult ? fileResult.files.length : undefined,
+	);
 </script>
 
-<figure class="tile">
-	<figcaption>
-		<span>
-			RESULT
-			{#if resultKind === "files" && fileResult}
-				<span class="count">{fileResult.files.length} parts</span>
-			{/if}
-			{#if running}
-				<RefreshCw class="rotating" size="16" />
-			{/if}
-		</span>
-	</figcaption>
+<PreviewTile label="RESULT" viewMode={resultKind} loading={running} {parts}>
 	<div class="canvas" class:checker={resultKind === "image"}>
 		{#if resultKind === "text" && textResult}
 			<div class="text-result-wrap">
@@ -83,20 +77,9 @@
 			<span class="empty">no result yet</span>
 		{/if}
 	</div>
-</figure>
+</PreviewTile>
 
 <style>
-	.tile figcaption {
-		display: flex;
-		align-items: center;
-		gap: var(--space-m);
-		margin-bottom: var(--space-m);
-		font: var(--font-size-s) var(--font-mono);
-		color: var(--color-text-muted);
-		& :global(.rotating) {
-			animation: rotate var(--duration-l) linear infinite;
-		}
-	}
 	.canvas {
 		display: flex;
 		align-items: center;
@@ -109,8 +92,10 @@
 		color: var(--color-text-muted);
 	}
 	.canvas img {
-		width: 100%;
-		height: 100%;
+		width: auto;
+		max-width: 100%;
+		height: auto;
+		max-height: 100vh;
 		object-fit: contain;
 		display: block;
 	}
@@ -124,10 +109,6 @@
 	.empty {
 		font: var(--font-size-s) var(--font-mono);
 	}
-	.count {
-		margin-left: var(--space-m);
-		color: var(--color-main);
-	}
 	.parts-grid {
 		display: grid;
 		grid-template-columns: repeat(
@@ -170,13 +151,4 @@
 		padding: var(--space-l);
 		box-sizing: border-box;
 	}
-
-	@keyframes rotate {
-		0% {
-			transform: rotate(0deg);
-		}
-		100% {
-			transform: rotate(360deg);
-		}
-	}
 </style>
diff --git a/web/src/lib/components/SchemaSourceTile.svelte b/web/src/lib/components/SchemaSourceTile.svelte
index 31b613a..42fafd8 100644
--- a/web/src/lib/components/SchemaSourceTile.svelte
+++ b/web/src/lib/components/SchemaSourceTile.svelte
@@ -2,6 +2,7 @@
 	import { toDataUrl } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
 	import type { InputMode } from "$lib/registry";
+	import PreviewTile from "./layout/PreviewTile.svelte";
 	import SchemaTextSource from "./SchemaTextSource.svelte";
 
 	interface Props {
@@ -24,61 +25,26 @@
 	const sourceUrl = $derived(source ? toDataUrl(source) : null);
 </script>
 
-<figure class="tile">
-	<figcaption><span>SOURCE</span></figcaption>
-	<div class="canvas" class:checker={mode === "image"}>
-		{#if mode === "text"}
-			<div class="text-source-wrap">
-				<SchemaTextSource
-					value={textSource}
-					disabled={running}
-					oninput={ontextinput ?? (() => {})}
-					onrender={onrendertext ?? (() => {})}
-				/>
-			</div>
-		{:else if mode === "image" && sourceUrl}
-			<img src={sourceUrl} alt="source" />
-		{:else if mode === "image"}
-			<span class="empty">choose an image</span>
-		{:else}
-			<span class="empty">no source — configure the parameters</span>
-		{/if}
-	</div>
-</figure>
+<PreviewTile label="SOURCE" viewMode={mode}>
+	{#if mode === "text"}
+		<div class="text-source-wrap">
+			<SchemaTextSource
+				value={textSource}
+				disabled={running}
+				oninput={ontextinput ?? (() => {})}
+				onrender={onrendertext ?? (() => {})}
+			/>
+		</div>
+	{:else if mode === "image" && sourceUrl}
+		<img src={sourceUrl} alt="source" />
+	{:else if mode === "image"}
+		<span class="empty">choose an image</span>
+	{:else}
+		<span class="empty">no source — configure the parameters</span>
+	{/if}
+</PreviewTile>
 
 <style>
-	.tile figcaption {
-		display: flex;
-		align-items: center;
-		gap: var(--space-m);
-		margin-bottom: var(--space-m);
-		font: var(--font-size-s) var(--font-mono);
-		color: var(--color-text-muted);
-	}
-	.canvas {
-		display: flex;
-		align-items: center;
-		justify-content: center;
-		min-height: clamp(var(--space-brand), 30vh, 60vh);
-		border: var(--size-border) solid var(--color-border);
-		border-radius: var(--radius-s);
-		overflow: hidden;
-		background: var(--color-background-muted);
-		color: var(--color-text-muted);
-	}
-	.canvas img {
-		width: 100%;
-		height: 100%;
-		object-fit: contain;
-		display: block;
-	}
-	.canvas.checker {
-		background: repeating-conic-gradient(
-				var(--color-checker-main) 0 25%,
-				var(--color-checker-alt) 0 50%
-			)
-			50% / 28px 28px;
-	}
 	.empty {
 		font: var(--font-size-s) var(--font-mono);
 	}
diff --git a/web/src/lib/components/layout/PreviewTile.svelte b/web/src/lib/components/layout/PreviewTile.svelte
new file mode 100644
index 0000000..e4e6f05
--- /dev/null
+++ b/web/src/lib/components/layout/PreviewTile.svelte
@@ -0,0 +1,91 @@
+<script lang="ts">
+	import type { InputMode, ResultKind } from "$lib/registry";
+	import { RefreshCw } from "@lucide/svelte";
+	import type { Snippet } from "svelte";
+
+	interface Props {
+		label: string;
+		viewMode: InputMode | ResultKind;
+		children: Snippet;
+		loading?: boolean;
+		parts?: number;
+	}
+	let {
+		label,
+		viewMode: mode,
+		children,
+		loading = false,
+		parts = undefined,
+	}: Props = $props();
+
+	// TODO: make canvas aspect ratio auto, from 16:9 to 9:16 max
+</script>
+
+<figure class="tile">
+	<figcaption>
+		<span>
+			{label}
+			{#if parts !== undefined}
+				<span class="count">{parts} parts</span>
+			{/if}
+			{#if loading}
+				<RefreshCw class="rotating" size="12" />
+			{/if}
+		</span>
+	</figcaption>
+	<div class="canvas" class:checker={mode === "image"}>
+		{@render children()}
+	</div>
+</figure>
+
+<style>
+	.tile figcaption {
+		display: flex;
+		align-items: center;
+		gap: var(--space-m);
+		margin-bottom: var(--space-m);
+		font: var(--font-size-s) var(--font-mono);
+		color: var(--color-text-muted);
+		& :global(.rotating) {
+			animation: rotate var(--duration-l) linear infinite;
+		}
+	}
+	.count {
+		margin-left: var(--space-m);
+		color: var(--color-main);
+	}
+	.canvas {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		min-height: clamp(var(--space-brand), 30vh, 60vh);
+		border: var(--size-border) solid var(--color-border);
+		border-radius: var(--radius-s);
+		overflow: hidden;
+		background: var(--color-background-muted);
+		color: var(--color-text-muted);
+	}
+	.canvas :global(img) {
+		width: auto;
+		max-width: 100%;
+		height: auto;
+		max-height: 100vh;
+		object-fit: contain;
+		display: block;
+	}
+	.canvas.checker {
+		background: repeating-conic-gradient(
+				var(--color-checker-main) 0 25%,
+				var(--color-checker-alt) 0 50%
+			)
+			50% / 28px 28px;
+	}
+	@keyframes rotate {
+		0% {
+			transform: rotate(0deg);
+		}
+		100% {
+			transform: rotate(360deg);
+		}
+	}
+</style>