diff --git a/src/app/Utils.ts b/src/app/Utils.ts
index aa37752f..207f5067 100644
--- a/src/app/Utils.ts
+++ b/src/app/Utils.ts
@@ -295,23 +295,23 @@ export class BiMap<A, B> {
 	}
 }
 
-export async function readZip(file: File | ArrayBuffer, predicate: (name: string) => boolean = () => true): Promise<[string, string][]> {
+export async function readZip(file: File | ArrayBuffer, predicate: (name: string) => boolean = () => true): Promise<[string, Uint8Array][]> {
 	const buffer = file instanceof File ? await file.arrayBuffer() : file
 	const reader = new zip.ZipReader(new zip.BlobReader(new Blob([buffer])))
 	const entries = await reader.getEntries()
 	return await Promise.all(entries
 		.filter(e => !e.directory && predicate(e.filename))
 		.map(async e => {
-			const writer = new zip.TextWriter('utf-8')
-			return [e.filename, await e.getData?.(writer)] as [string, string]
+			const writer = new zip.Uint8ArrayWriter()
+			return [e.filename, await e.getData?.(writer)]
 		})
 	)
 }
 
-export async function writeZip(entries: [string, string][]): Promise<string> {
+export async function writeZip(entries: [string, Uint8Array][]): Promise<string> {
 	const writer = new zip.ZipWriter(new zip.Data64URIWriter('application/zip'))
 	await Promise.all(entries.map(async ([name, data]) => {
-		await writer.add(name, new zip.TextReader(data))
+		await writer.add(name, new zip.Uint8ArrayReader(data))
 	}))
 	return await writer.close()
 }
diff --git a/src/app/components/customized/CustomizedPanel.tsx b/src/app/components/customized/CustomizedPanel.tsx
index 0bc95e8f..0b0df0b2 100644
--- a/src/app/components/customized/CustomizedPanel.tsx
+++ b/src/app/components/customized/CustomizedPanel.tsx
@@ -44,11 +44,13 @@ export function CustomizedPanel({ tab }: Props) {
 			const entries = Object.entries(pack).flatMap(([type, files]) => {
 				const prefix = `data/minecraft/${type}/`
 				return [...files.entries()].map(([name, data]) => {
-					return [prefix + name + '.json', stringifySource(JSON.stringify(data, null, 2), 'json')] as [string, string]
+					const text = stringifySource(JSON.stringify(data, null, 2), 'json')
+					return [prefix + name + '.json', new TextEncoder().encode(text)] as [string, Uint8Array]
 				})
 			})
 			const pack_format = config.versions.find(v => v.id === version)!.pack_format
-			entries.push(['pack.mcmeta', stringifySource(JSON.stringify({ pack: { pack_format, description: 'Customized world from misode.github.io' } }, null, 2), 'json')])
+			const packMcmetaText = stringifySource(JSON.stringify({ pack: { pack_format, description: 'Customized world from misode.github.io' } }, null, 2), 'json')
+			entries.push(['pack.mcmeta', new TextEncoder().encode(packMcmetaText)])
 			const url = await writeZip(entries)
 			download.current.setAttribute('href', url)
 			download.current.setAttribute('download', 'customized.zip')
diff --git a/src/app/components/generator/ProjectPanel.tsx b/src/app/components/generator/ProjectPanel.tsx
index 8cbf2c66..1d71ca16 100644
--- a/src/app/components/generator/ProjectPanel.tsx
+++ b/src/app/components/generator/ProjectPanel.tsx
@@ -47,8 +47,7 @@ export function ProjectPanel() {
 		if (!download.current || entries === undefined) return
 		const zipEntries = await Promise.all(entries.map(async e => {
 			const data = await client.fs.readFile(projectRoot + e)
-			const text = new TextDecoder().decode(data)
-			return [e, text] as [string, string]
+			return [e, data] as [string, Uint8Array]
 		}))
 		const url = await writeZip(zipEntries)
 		download.current.setAttribute('href', url)