diff --git a/sppa/ayun/ayunEPKCompiler.js b/sppa/ayun/ayunEPKCompiler.js
new file mode 100644
index 00000000..2ff5cd25
--- /dev/null
+++ b/sppa/ayun/ayunEPKCompiler.js
@@ -0,0 +1,130 @@
+window.compileEPK = function() {
+	let old = false;
+
+	// https://stackoverflow.com/a/18639903/6917520
+
+	const crc32 = (function() {
+		let table = new Uint32Array(256);
+
+		for (let i = 256; i--;) {
+			let tmp = i;
+
+			for (let k = 8; k--;) {
+				tmp = tmp & 1 ? 3988292384 ^ tmp >>> 1 : tmp >>> 1;
+			}
+
+			table[i] = tmp;
+		}
+
+		return function(data) {
+			let crc = -1;
+
+			for (let i = 0, l = data.length; i < l; i++) {
+				crc = crc >>> 8 ^ table[crc & 255 ^ data[i]];
+			}
+
+			return (crc ^ -1) >>> 0;
+		};
+	})();
+
+	function concatTypedArrays(a, b) {
+		const c = new (a.constructor)(a.length + b.length);
+		c.set(a, 0);
+		c.set(b, a.length);
+		return c;
+	}
+
+	const textEncoder = new TextEncoder();
+	function generateLongArray(num) {
+		return Uint8Array.of((num >>> 56) & 0xFF, (num >>> 48) & 0xFF, (num >>> 40) & 0xFF, (num >>> 32) & 0xFF, (num >>> 24) & 0xFF, (num >>> 16) & 0xFF, (num >>> 8) & 0xFF, num & 0xFF);
+	}
+	function generateIntArray(num) {
+		return Uint8Array.of((num >>> 24) & 0xFF, (num >>> 16) & 0xFF, (num >>> 8) & 0xFF, num & 0xFF);
+	}
+	function generateShortArray(num) {
+		return Uint8Array.of((num >>> 8) & 0xFF, num & 0xFF);
+	}
+	function generateUTF(str) {
+		return concatTypedArrays(generateShortArray(str.length), textEncoder.encode(str));
+	}
+	function generateUTFByte(str) {
+		return concatTypedArrays(Uint8Array.of(str.length), textEncoder.encode(str));
+	}
+
+	let comment = '# eaglercraft package file - generated with ayunWebEPK by ayunami2000';
+
+	let commentNew = '\n\n # Eagler EPK v2.0 (c) $$YEAR$$ Calder Young\n # generated with ayunWebEPK by ayunami2000';
+
+	let baseEPK = textEncoder.encode('EAGPKG!!');
+
+	baseEPK = concatTypedArrays(baseEPK, generateUTF(comment));
+
+	let baseEPKNew = textEncoder.encode('EAGPKG$$');
+	
+	baseEPKNew = concatTypedArrays(baseEPKNew, generateUTFByte('ver2.0'));
+
+	baseEPKNew = concatTypedArrays(baseEPKNew, generateUTFByte('my-cool.epk'));
+
+	let currentEPK = null;
+
+	function processFile(name, type, file) {
+		if (old) {
+			currentEPK = currentEPK == null ? generateUTF('<file>') : concatTypedArrays(currentEPK, generateUTF('<file>'));
+			currentEPK = concatTypedArrays(currentEPK, generateUTF(name));
+			currentEPK = concatTypedArrays(currentEPK, new Uint8Array(sha1.arrayBuffer(file.buffer)));
+			currentEPK = concatTypedArrays(currentEPK, generateIntArray(file.byteLength));
+			currentEPK = concatTypedArrays(currentEPK, file);
+			currentEPK = concatTypedArrays(currentEPK, generateUTF('</file>'));
+		} else {
+			currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(type));
+			currentEPK = concatTypedArrays(currentEPK, generateUTFByte(name));
+			currentEPK = concatTypedArrays(currentEPK, generateIntArray(file.byteLength + 5));
+			currentEPK = concatTypedArrays(currentEPK, generateIntArray(crc32(file)));
+			currentEPK = concatTypedArrays(currentEPK, file);
+			currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(':>'));
+		}
+	}
+	
+	function wrapItUp(size) {
+		if (old) {
+			currentEPK = concatTypedArrays(currentEPK, generateUTF(' end'));
+			currentEPK = concatTypedArrays(baseEPK, new Uint8Array(pako.deflate(currentEPK, { level: 9 })));
+		} else {
+			let currBaseEPK = baseEPKNew;
+			currBaseEPK = concatTypedArrays(currBaseEPK, generateUTF(commentNew.replace('$$YEAR$$', new Date().getFullYear())));
+			currBaseEPK = concatTypedArrays(currBaseEPK, generateLongArray(Date.now()));
+			currBaseEPK = concatTypedArrays(currBaseEPK, generateIntArray(size + 1));
+			currBaseEPK = concatTypedArrays(currBaseEPK, Uint8Array.of(90));
+			currentEPK = concatTypedArrays(currentEPK, textEncoder.encode('END$'));
+			currentEPK = concatTypedArrays(currBaseEPK, new Uint8Array(pako.deflate(currentEPK, { level: 9 })));
+			currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(':::YEE:>'));
+		}
+		const blob = new Blob([ currentEPK ], { type: 'application/octet-stream' });
+		currentEPK = null;
+		old = false;
+		return blob;
+	}
+
+	return async function(files, oldMode, fileev) {
+		let onfile = function() {};
+		if (fileev != null) {
+			onfile = fileev;
+		}
+		currentEPK = null;
+		old = oldMode;
+		// files is same format as output from decompiler
+		if (!old) {
+			currentEPK = textEncoder.encode('HEAD');
+			currentEPK = concatTypedArrays(currentEPK, generateUTFByte('file-type'));
+			const fileType = 'epk/resources';
+			currentEPK = concatTypedArrays(currentEPK, generateIntArray(fileType.length));
+			currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(fileType));
+			currentEPK = concatTypedArrays(currentEPK, Uint8Array.of(62));
+		}
+		for (const file of files) {
+			processFile(file.name, file.type, new Uint8Array(await file.data.arrayBuffer()));
+			onfile();
+		}
+		return wrapItUp(files.length);
+	};
+};
\ No newline at end of file