diff --git a/src/lib/components/functional/ConversionPanel.svelte b/src/lib/components/functional/ConversionPanel.svelte
index 35165f3..49f7eaf 100644
--- a/src/lib/components/functional/ConversionPanel.svelte
+++ b/src/lib/components/functional/ConversionPanel.svelte
@@ -69,7 +69,7 @@
 			{#if files.requiredConverters.length === 1}
 				<!-- cannot convert to svg or heif -->
 				{@const supported = files.files[0]?.converters
-					.flatMap((c) => c.supportedFormats)
+					.flatMap((c) => c.formatStrings((f) => f.toSupported))
 					?.filter(
 						(format) => format !== ".svg" && format !== ".heif",
 					)}
diff --git a/src/lib/components/functional/Dropdown.svelte b/src/lib/components/functional/Dropdown.svelte
index d7f064c..102b14d 100644
--- a/src/lib/components/functional/Dropdown.svelte
+++ b/src/lib/components/functional/Dropdown.svelte
@@ -62,8 +62,8 @@
 			: 'justify-center'} overflow-hidden relative cursor-pointer {settingsStyle
 			? 'px-4'
 			: 'px-3'} py-3.5 bg-button {disabled
-			? 'opacity-50'
-			: ''} flex items-center {settingsStyle
+			? 'opacity-50 cursor-auto'
+			: 'cursor-pointer'} flex items-center {settingsStyle
 			? 'rounded-xl'
 			: 'rounded-full'} focus:!outline-none"
 		onclick={toggle}
diff --git a/src/lib/components/functional/Uploader.svelte b/src/lib/components/functional/Uploader.svelte
index 6bd1221..6c17f11 100644
--- a/src/lib/components/functional/Uploader.svelte
+++ b/src/lib/components/functional/Uploader.svelte
@@ -31,7 +31,7 @@
 			)
 		).filter((c) => typeof c !== "undefined");
 		acceptedTypes = filteredConverters
-			.map((c) => c.supportedFormats.join(","))
+			.map((c) => c.formatStrings((f) => f.fromSupported).join(","))
 			.join(",");
 	};
 
diff --git a/src/lib/converters/converter.svelte.ts b/src/lib/converters/converter.svelte.ts
index 5482bd8..4c0fc85 100644
--- a/src/lib/converters/converter.svelte.ts
+++ b/src/lib/converters/converter.svelte.ts
@@ -1,5 +1,24 @@
 import type { VertFile } from "$lib/types";
 
+export class FormatInfo {
+	public name: string;
+
+	constructor(
+		name: string,
+		public fromSupported: boolean,
+		public toSupported: boolean,
+	) {
+		this.name = name;
+		if (!this.name.startsWith(".")) {
+			this.name = `.${this.name}`;
+		}
+
+		if (!this.fromSupported && !this.toSupported) {
+			throw new Error("Format must support at least one direction");
+		}
+	}
+}
+
 /**
  * Base class for all converters.
  */
@@ -11,7 +30,7 @@ export class Converter {
 	/**
 	 * List of supported formats.
 	 */
-	public supportedFormats: string[] = [];
+	public supportedFormats: FormatInfo[] = [];
 	/**
 	 * Convert a file to a different format.
 	 * @param input The input file.
@@ -34,4 +53,11 @@ export class Converter {
 	public async valid(): Promise<boolean> {
 		return true;
 	}
+
+	public formatStrings(predicate?: (f: FormatInfo) => boolean) {
+		if (predicate) {
+			return this.supportedFormats.filter(predicate).map((f) => f.name);
+		}
+		return this.supportedFormats.map((f) => f.name);
+	}
 }
diff --git a/src/lib/converters/ffmpeg.svelte.ts b/src/lib/converters/ffmpeg.svelte.ts
index 9a1d0c2..9ce3e69 100644
--- a/src/lib/converters/ffmpeg.svelte.ts
+++ b/src/lib/converters/ffmpeg.svelte.ts
@@ -1,5 +1,5 @@
 import { VertFile } from "$lib/types";
-import { Converter } from "./converter.svelte";
+import { Converter, FormatInfo } from "./converter.svelte";
 import { FFmpeg } from "@ffmpeg/ffmpeg";
 import { browser } from "$app/environment";
 import { error, log } from "$lib/logger";
@@ -11,17 +11,17 @@ export class FFmpegConverter extends Converter {
 	public ready = $state(false);
 
 	public supportedFormats = [
-		".mp3",
-		".wav",
-		".flac",
-		".ogg",
-		".aac",
-		".m4a",
-		".wma",
-		".amr",
-		".ac3",
-		".alac",
-		".aiff",
+		new FormatInfo("mp3", true, true),
+		new FormatInfo("wav", true, true),
+		new FormatInfo("flac", true, true),
+		new FormatInfo("ogg", true, true),
+		new FormatInfo("aac", true, true),
+		new FormatInfo("m4a", true, true),
+		new FormatInfo("wma", true, true),
+		new FormatInfo("amr", true, true),
+		new FormatInfo("ac3", true, true),
+		new FormatInfo("alac", true, true),
+		new FormatInfo("aiff", true, true),
 	];
 
 	public readonly reportsProgress = true;
diff --git a/src/lib/converters/pandoc.svelte.ts b/src/lib/converters/pandoc.svelte.ts
index 8b1326d..8984e25 100644
--- a/src/lib/converters/pandoc.svelte.ts
+++ b/src/lib/converters/pandoc.svelte.ts
@@ -1,5 +1,5 @@
 import { VertFile } from "$lib/types";
-import { Converter } from "./converter.svelte";
+import { Converter, FormatInfo } from "./converter.svelte";
 import { browser } from "$app/environment";
 import PandocWorker from "$lib/workers/pandoc?worker";
 
@@ -61,23 +61,19 @@ export class PandocConverter extends Converter {
 		);
 	}
 
-	// public name = "pandoc";
-	// public ready = $state(false);
-	// public wasm: ArrayBuffer = null!;
-
 	public supportedFormats = [
-		".docx",
-		".doc",
-		".md",
-		".html",
-		".rtf",
-		".csv",
-		".tsv",
-		".json",
-		".rst",
-		".epub",
-		".odt",
-		".docbook",
+		new FormatInfo("docx", true, true),
+		new FormatInfo("doc", true, true),
+		new FormatInfo("md", true, true),
+		new FormatInfo("html", true, true),
+		new FormatInfo("rtf", true, true),
+		new FormatInfo("csv", true, true),
+		new FormatInfo("tsv", true, true),
+		new FormatInfo("json", true, true),
+		new FormatInfo("rst", true, true),
+		new FormatInfo("epub", true, true),
+		new FormatInfo("odt", true, true),
+		new FormatInfo("docbook", true, true),
 	];
 }
 
diff --git a/src/lib/converters/vertd.svelte.ts b/src/lib/converters/vertd.svelte.ts
index d7adf9c..94f9d20 100644
--- a/src/lib/converters/vertd.svelte.ts
+++ b/src/lib/converters/vertd.svelte.ts
@@ -1,7 +1,7 @@
 import { log } from "$lib/logger";
 import { Settings } from "$lib/sections/settings/index.svelte";
 import { VertFile } from "$lib/types";
-import { Converter } from "./converter.svelte";
+import { Converter, FormatInfo } from "./converter.svelte";
 
 interface VertdError {
 	type: "error";
@@ -200,16 +200,18 @@ export class VertdConverter extends Converter {
 	public name = "vertd";
 	public ready = $state(false);
 	public reportsProgress = true;
+
 	public supportedFormats = [
-		".mkv",
-		".mp4",
-		".webm",
-		".avi",
-		".wmv",
-		".mov",
-		".gif",
-		".mts",
+		new FormatInfo("mkv", true, true),
+		new FormatInfo("mp4", true, true),
+		new FormatInfo("webm", true, true),
+		new FormatInfo("avi", true, true),
+		new FormatInfo("wmv", true, true),
+		new FormatInfo("mov", true, true),
+		new FormatInfo("gif", true, true),
+		new FormatInfo("mts", true, true),
 	];
+
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
 	private log: (...msg: any[]) => void = () => {};
 
diff --git a/src/lib/converters/vips.svelte.ts b/src/lib/converters/vips.svelte.ts
index bdba091..d8b4e41 100644
--- a/src/lib/converters/vips.svelte.ts
+++ b/src/lib/converters/vips.svelte.ts
@@ -4,7 +4,7 @@ import { addToast } from "$lib/store/ToastProvider";
 import type { OmitBetterStrict, WorkerMessage } from "$lib/types";
 import { VertFile } from "$lib/types";
 import VipsWorker from "$lib/workers/vips?worker&url";
-import { Converter } from "./converter.svelte";
+import { Converter, FormatInfo } from "./converter.svelte";
 
 export class VipsConverter extends Converter {
 	private worker: Worker = browser
@@ -15,34 +15,32 @@ export class VipsConverter extends Converter {
 	private id = 0;
 	public name = "libvips";
 	public ready = $state(false);
-	public static supportedFormatsStatic = [
-		...new Set([
-			".png",
-			".jpeg",
-			".jpg",
-			".webp",
-			".gif",
-			".ico",
-			".cur",
-			".ani",
-			".heic",
-			".hdr",
-			".jpe",
-			".dng",
-			".mat",
-			".pbm",
-			".pfm",
-			".pgm",
-			".pnm",
-			".ppm",
-			".raw",
-			".tif",
-			".tiff",
-			".jfif",
-		]),
-	];
 
-	public supportedFormats = VipsConverter.supportedFormatsStatic;
+	public supportedFormats = [
+		new FormatInfo("png", true, true),
+		new FormatInfo("jpeg", true, true),
+		new FormatInfo("jpg", true, true),
+		new FormatInfo("webp", true, true),
+		new FormatInfo("gif", true, true),
+		new FormatInfo("ico", true, false),
+		new FormatInfo("cur", true, false),
+		new FormatInfo("ani", true, false),
+		new FormatInfo("heic", true, false),
+		new FormatInfo("hdr", true, true),
+		new FormatInfo("jpe", true, true),
+		new FormatInfo("dng", true, false),
+		new FormatInfo("mat", true, true),
+		new FormatInfo("pbm", true, true),
+		new FormatInfo("pfm", true, true),
+		new FormatInfo("pgm", true, true),
+		new FormatInfo("pnm", true, true),
+		new FormatInfo("ppm", true, true),
+		new FormatInfo("raw", false, true),
+		new FormatInfo("tif", true, true),
+		new FormatInfo("tiff", true, true),
+		new FormatInfo("jfif", true, true),
+		new FormatInfo("avif", true, true),
+	];
 
 	public readonly reportsProgress = false;
 
diff --git a/src/lib/store/index.svelte.ts b/src/lib/store/index.svelte.ts
index 2d9e8e3..bf99690 100644
--- a/src/lib/store/index.svelte.ts
+++ b/src/lib/store/index.svelte.ts
@@ -32,10 +32,12 @@ class Files {
 		this.thumbnailQueue.add(async () => {
 			const isAudio = converters
 				.find((c) => c.name === "ffmpeg")
-				?.supportedFormats?.includes(file.from.toLowerCase());
+				?.formatStrings()
+				?.includes(file.from.toLowerCase());
 			const isVideo = converters
 				.find((c) => c.name === "vertd")
-				?.supportedFormats?.includes(file.from.toLowerCase());
+				?.formatStrings()
+				?.includes(file.from.toLowerCase());
 
 			try {
 				if (isAudio) {
@@ -119,16 +121,16 @@ class Files {
 				return;
 			}
 			const converter = converters.find((c) =>
-				c.supportedFormats.includes(
-					format || ".somenonexistentextension",
-				),
+				c
+					.formatStrings()
+					.includes(format || ".somenonexistentextension"),
 			);
 			if (!converter) {
 				log(["files"], `no converter found for ${file.name}`);
 				this.files.push(new VertFile(file, format));
 				return;
 			}
-			const to = converter.supportedFormats.find((f) => f !== format);
+			const to = converter.formatStrings().find((f) => f !== format);
 			if (!to) {
 				log(["files"], `no output format found for ${file.name}`);
 				return;
diff --git a/src/lib/types/file.svelte.ts b/src/lib/types/file.svelte.ts
index 5b9fc6d..f77156c 100644
--- a/src/lib/types/file.svelte.ts
+++ b/src/lib/types/file.svelte.ts
@@ -28,7 +28,7 @@ export class VertFile {
 
 	public findConverters(supportedFormats: string[] = [this.from]) {
 		const converter = this.converters.filter((converter) =>
-			converter.supportedFormats.map((f) => supportedFormats.includes(f)),
+			converter.formatStrings().map((f) => supportedFormats.includes(f)),
 		);
 		return converter;
 	}
@@ -36,8 +36,8 @@ export class VertFile {
 	public findConverter() {
 		const converter = this.converters.find(
 			(converter) =>
-				converter.supportedFormats.includes(this.from) &&
-				converter.supportedFormats.includes(this.to),
+				converter.formatStrings().includes(this.from) &&
+				converter.formatStrings().includes(this.to),
 		);
 		return converter;
 	}
@@ -51,7 +51,7 @@ export class VertFile {
 		this.file = newFile;
 		this.to = to;
 		this.converters = converters.filter((c) =>
-			c.supportedFormats.includes(this.from),
+			c.formatStrings().includes(this.from),
 		);
 		this.convert = this.convert.bind(this);
 		this.download = this.download.bind(this);
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 3001f7d..4c7f77c 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -8,8 +8,13 @@
 	const { data } = $props();
 
 	const getSupportedFormats = (name: string) =>
-		converters.find((c) => c.name === name)?.supportedFormats.join(", ") ||
-		"none";
+		converters
+			.find((c) => c.name === name)
+			?.supportedFormats.map(
+				(f) =>
+					`${f.name}${f.fromSupported && f.toSupported ? "" : "*"}`,
+			)
+			.join(", ") || "none";
 
 	const status: {
 		[key: string]: {
diff --git a/src/routes/convert/+page.svelte b/src/routes/convert/+page.svelte
index c13bad9..a058220 100644
--- a/src/routes/convert/+page.svelte
+++ b/src/routes/convert/+page.svelte
@@ -89,21 +89,25 @@
 	{@const availableConverters = file.findConverters()}
 	{@const currentConverter = converters.find(
 		(c) =>
-			c.supportedFormats.includes(file.from) &&
-			c.supportedFormats.includes(file.to),
+			c.formatStrings((f) => f.fromSupported).includes(file.from) &&
+			c.formatStrings((f) => f.toSupported).includes(file.to),
 	)}
 	{@const isAudio = converters
 		.find((c) => c.name === "ffmpeg")
-		?.supportedFormats.includes(file.from)}
+		?.formatStrings((f) => f.fromSupported)
+		.includes(file.from)}
 	{@const isVideo = converters
 		.find((c) => c.name === "vertd")
-		?.supportedFormats.includes(file.from)}
+		?.formatStrings((f) => f.fromSupported)
+		.includes(file.from)}
 	{@const isImage = converters
 		.find((c) => c.name === "libvips")
-		?.supportedFormats.includes(file.from)}
+		?.formatStrings((f) => f.fromSupported)
+		.includes(file.from)}
 	{@const isDocument = converters
 		.find((c) => c.name === "pandoc")
-		?.supportedFormats.includes(file.from)}
+		?.formatStrings((f) => f.fromSupported)
+		.includes(file.from)}
 	<Panel class="p-5 flex flex-col min-w-0 gap-4 relative">
 		<div class="flex-shrink-0 h-8 w-full flex items-center gap-2">
 			{#if !converters.length}
@@ -222,7 +226,9 @@
 						<!-- cannot convert to svg or heif -->
 						<Dropdown
 							options={availableConverters
-								.flatMap((c) => c.supportedFormats)
+								.flatMap((c) =>
+									c.formatStrings((f) => f.toSupported),
+								)
 								.filter(
 									(format) =>
 										format !== ".svg" && format !== ".heif",