diff --git a/codecs/wp2/dec/wp2_dec.cpp b/codecs/wp2/dec/wp2_dec.cpp
index d661ad9c..5ee45156 100644
--- a/codecs/wp2/dec/wp2_dec.cpp
+++ b/codecs/wp2/dec/wp2_dec.cpp
@@ -1,40 +1,24 @@
-#include <cstdio>
 #include <emscripten/bind.h>
 #include <emscripten/val.h>
-
+#include <cstdio>
 #include "src/wp2/decode.h"
+
 using namespace emscripten;
 
-class RawImage {
-public:
-  val buffer;
-  int width;
-  int height;
+thread_local const val Uint8ClampedArray = val::global("Uint8ClampedArray");
+thread_local const val ImageData = val::global("ImageData");
 
-  RawImage(val b, int w, int h) : buffer(b), width(w), height(h) {}
-};
-
-WP2::ArgbBuffer *buffer = new WP2::ArgbBuffer(WP2_rgbA_32);
-
-RawImage decode(std::string image_in) {
-  WP2Status status;
-  status = WP2::Decode(image_in, buffer);
+val decode(std::string image_in) {
+  WP2::ArgbBuffer buffer(WP2_rgbA_32);
+  WP2Status status = WP2::Decode(image_in, &buffer);
   if (status != WP2_STATUS_OK) {
-    return RawImage(val::null(), -1, -1);
+    return val::null();
   }
-  return RawImage(val(typed_memory_view(buffer->width * buffer->height * 4,
-                                        (uint8_t *)buffer->GetRow(0))),
-                  buffer->width, buffer->height);
+  return ImageData.new_(
+      Uint8ClampedArray.new_(typed_memory_view(buffer.stride * buffer.height, buffer.GetRow8(0))),
+      buffer.width, buffer.height);
 }
 
-void free_result() { delete buffer; }
-
 EMSCRIPTEN_BINDINGS(my_module) {
-  class_<RawImage>("RawImage")
-      .property("buffer", &RawImage::buffer)
-      .property("width", &RawImage::width)
-      .property("height", &RawImage::height);
-
   function("decode", &decode);
-  function("free_result", &free_result);
 }
diff --git a/codecs/wp2/dec/wp2_dec.d.ts b/codecs/wp2/dec/wp2_dec.d.ts
index 128c95a2..877df248 100644
--- a/codecs/wp2/dec/wp2_dec.d.ts
+++ b/codecs/wp2/dec/wp2_dec.d.ts
@@ -1,13 +1,5 @@
-interface RawImage {
-  buffer: Uint8Array;
-  width: number;
-  height: number;
-}
-
 interface WP2Module extends EmscriptenWasm.Module {
-  decode(data: BufferSource): RawImage;
-  free_result(): void;
+  decode(data: BufferSource): ImageData | null;
 }
 
 export default function(opts: EmscriptenWasm.ModuleOpts): Promise<WP2Module>;
-
diff --git a/codecs/wp2/dec/wp2_dec.js b/codecs/wp2/dec/wp2_dec.js
index 190be496..4f6e8c9f 100644
--- a/codecs/wp2/dec/wp2_dec.js
+++ b/codecs/wp2/dec/wp2_dec.js
@@ -7,66 +7,53 @@ function(wp2_dec) {
   wp2_dec = wp2_dec || {};
 
 
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+function db(a){for(;a.length;){var b=a.pop();a.pop()(b)}}function eb(a,b){var c=d;if(void 0===c[a].Y){var e=c[a];c[a]=function(){c[a].Y.hasOwnProperty(arguments.length)||W("Function '"+b+"' called with an invalid number of arguments ("+arguments.length+") - expects one of ("+c[a].Y+")!");return c[a].Y[arguments.length].apply(this,arguments)};c[a].Y=[];c[a].Y[e.da]=e}}
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+(q-2)+" args!');\n}\n";C&&(n+="var destructors = [];\n");var Ya=C?"destructors":"null";K="throwBindingError invoker fn runDestructors retType classParam".split(" ");p=[W,p,g,db,h[0],h[1]];y&&(n+="var thisWired = classParam.toWireType("+Ya+", this);\n");for(m=0;m<q-2;++m)n+="var arg"+m+"Wired = argType"+m+".toWireType("+Ya+", arg"+m+"); // "+h[m+2].name+"\n",K.push("argType"+m),p.push(h[m+2]);y&&(P="thisWired"+(0<P.length?", ":"")+P);n+=(Xa?"var rv = ":"")+"invoker(fn"+(0<P.length?", ":"")+P+");\n";
+if(C)n+="runDestructors(destructors);\n";else for(m=y?1:2;m<h.length;++m)q=1===m?"thisWired":"arg"+(m-2)+"Wired",null!==h[m].Z&&(n+=q+"_dtor("+q+"); // "+h[m].name+"\n",K.push(q+"_dtor"),p.push(h[m].Z));Xa&&(n+="var ret = retType.fromWireType(rv);\nreturn ret;\n");K.push(n+"}\n");h=cb(K).apply(null,p);m=b-1;if(!d.hasOwnProperty(k))throw new Ta("Replacing nonexistant public symbol");void 0!==d[k].Y&&void 0!==m?d[k].Y[m]=h:(d[k]=h,d[k].da=m);return[]})},b:function(a,b,c,e,f){function g(n){return n}
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+h+=g;g=k+1}}else{h=Array(f);for(l=0;l<f;++l)h[l]=String.fromCharCode(F[e+4+l]);h=h.join("")}Z(e);return h},toWireType:function(e,f){f instanceof ArrayBuffer&&(f=new Uint8Array(f));var g="string"===typeof f;g||f instanceof Uint8Array||f instanceof Uint8ClampedArray||f instanceof Int8Array||W("Cannot pass non-string to std::string");var l=(c&&g?function(){for(var n=0,p=0;p<f.length;++p){var q=f.charCodeAt(p);55296<=q&&57343>=q&&(q=65536+((q&1023)<<10)|f.charCodeAt(++p)&1023);127>=q?++n:n=2047>=q?n+
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+k=2);X(a,{name:c,fromWireType:function(h){for(var n=L[h>>2],p=l(),q,y=h+4,C=0;C<=n;++C){var m=h+4+C*b;if(C==n||0==p[m>>k])y=e(y,m-y),void 0===q?q=y:(q+=String.fromCharCode(0),q+=y),y=m+b}Z(h);return q},toWireType:function(h,n){"string"!==typeof n&&W("Cannot pass non-string to C++ string type "+c);var p=g(n),q=ub(4+p+b);L[q>>2]=p>>k;f(n,q+4,p+b);null!==h&&h.push(Z,q);return q},argPackAdvance:8,readValueFromPointer:$a,Z:function(h){Z(h)}})},z:function(a,b){b=S(b);X(a,{ga:!0,name:b,argPackAdvance:0,
+fromWireType:function(){},toWireType:function(){}})},e:Wa,f:function(a){if(0===a)return Za(ob());var b=nb[a];a=void 0===b?S(a):b;return Za(ob()[a])},i:function(a){4<a&&(Y[a].aa+=1)},j:function(a,b,c,e){a||W("Cannot use deleted val. handle = "+a);a=Y[a].value;var f=qb[b];if(!f){f="";for(var g=0;g<b;++g)f+=(0!==g?", ":"")+"arg"+g;var l="return function emval_allocator_"+b+"(constructor, argTypes, args) {\n";for(g=0;g<b;++g)l+="var argType"+g+" = requireRegisteredType(Module['HEAP32'][(argTypes >>> 2) + "+
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+(function(){function a(f){d.asm=f.exports;N--;d.monitorRunDependencies&&d.monitorRunDependencies(N);0==N&&(null!==Ga&&(clearInterval(Ga),Ga=null),O&&(f=O,O=null,f()))}function b(f){a(f.instance)}function c(f){return La().then(function(g){return WebAssembly.instantiate(g,e)}).then(f,function(g){B("failed to asynchronously prepare wasm: "+g);A(g)})}var e={a:vb};N++;d.monitorRunDependencies&&d.monitorRunDependencies(N);if(d.instantiateWasm)try{return d.instantiateWasm(e,a)}catch(f){return B("Module.instantiateWasm callback failed with error: "+
+f),!1}(function(){if(D||"function"!==typeof WebAssembly.instantiateStreaming||Ia()||Ha("file://")||"function"!==typeof fetch)return c(b);fetch(Q,{credentials:"same-origin"}).then(function(f){return WebAssembly.instantiateStreaming(f,e).then(b,function(g){B("wasm streaming compile failed: "+g);B("falling back to ArrayBuffer instantiation");return c(b)})})})();return{}})();
+var Ma=d.___wasm_call_ctors=function(){return(Ma=d.___wasm_call_ctors=d.asm.C).apply(null,arguments)},ub=d._malloc=function(){return(ub=d._malloc=d.asm.D).apply(null,arguments)},Z=d._free=function(){return(Z=d._free=d.asm.E).apply(null,arguments)},kb=d.___getTypeName=function(){return(kb=d.___getTypeName=d.asm.F).apply(null,arguments)};d.___embind_register_native_and_builtin_types=function(){return(d.___embind_register_native_and_builtin_types=d.asm.G).apply(null,arguments)};
+d.dynCall_iii=function(){return(d.dynCall_iii=d.asm.H).apply(null,arguments)};d.dynCall_vii=function(){return(d.dynCall_vii=d.asm.I).apply(null,arguments)};d.dynCall_vi=function(){return(d.dynCall_vi=d.asm.J).apply(null,arguments)};d.dynCall_viii=function(){return(d.dynCall_viii=d.asm.K).apply(null,arguments)};d.dynCall_viiiiiiii=function(){return(d.dynCall_viiiiiiii=d.asm.L).apply(null,arguments)};d.dynCall_ii=function(){return(d.dynCall_ii=d.asm.M).apply(null,arguments)};
+d.dynCall_viiiiiii=function(){return(d.dynCall_viiiiiii=d.asm.N).apply(null,arguments)};d.dynCall_viiiiiiiii=function(){return(d.dynCall_viiiiiiiii=d.asm.O).apply(null,arguments)};d.dynCall_viiii=function(){return(d.dynCall_viiii=d.asm.P).apply(null,arguments)};d.dynCall_viiiiii=function(){return(d.dynCall_viiiiii=d.asm.Q).apply(null,arguments)};d.dynCall_iidiiii=function(){return(d.dynCall_iidiiii=d.asm.R).apply(null,arguments)};d.dynCall_v=function(){return(d.dynCall_v=d.asm.S).apply(null,arguments)};
+d.dynCall_viiiii=function(){return(d.dynCall_viiiii=d.asm.T).apply(null,arguments)};d.dynCall_iiiiii=function(){return(d.dynCall_iiiiii=d.asm.U).apply(null,arguments)};d.dynCall_iiii=function(){return(d.dynCall_iiii=d.asm.V).apply(null,arguments)};d.dynCall_iiiii=function(){return(d.dynCall_iiiii=d.asm.W).apply(null,arguments)};d.dynCall_jiji=function(){return(d.dynCall_jiji=d.asm.X).apply(null,arguments)};var wb;O=function xb(){wb||yb();wb||(O=xb)};
+function yb(){function a(){if(!wb&&(wb=!0,d.calledRun=!0,!ja)){M(Aa);M(Ba);aa(d);if(d.onRuntimeInitialized)d.onRuntimeInitialized();if(d.postRun)for("function"==typeof d.postRun&&(d.postRun=[d.postRun]);d.postRun.length;){var b=d.postRun.shift();Ca.unshift(b)}M(Ca)}}if(!(0<N)){if(d.preRun)for("function"==typeof d.preRun&&(d.preRun=[d.preRun]);d.preRun.length;)Da();M(za);0<N||(d.setStatus?(d.setStatus("Running..."),setTimeout(function(){setTimeout(function(){d.setStatus("")},1);a()},1)):a())}}
+d.run=yb;if(d.preInit)for("function"==typeof d.preInit&&(d.preInit=[d.preInit]);0<d.preInit.length;)d.preInit.pop()();noExitRuntime=!0;yb();
 
 
   return wp2_dec.ready
diff --git a/codecs/wp2/dec/wp2_dec.wasm b/codecs/wp2/dec/wp2_dec.wasm
index b30346b8..360ae90c 100644
Binary files a/codecs/wp2/dec/wp2_dec.wasm and b/codecs/wp2/dec/wp2_dec.wasm differ
diff --git a/codecs/wp2/enc/wp2_enc.cpp b/codecs/wp2/enc/wp2_enc.cpp
index 41a89d46..3066101b 100644
--- a/codecs/wp2/enc/wp2_enc.cpp
+++ b/codecs/wp2/enc/wp2_enc.cpp
@@ -1,18 +1,18 @@
-#include <cstdio>
 #include <emscripten/bind.h>
 #include <emscripten/val.h>
-
+#include <cstdio>
 #include "src/wp2/encode.h"
+
 using namespace emscripten;
 
-val encode(std::string image_in, int image_width, int image_height,
-           WP2::EncoderConfig config) {
-  WP2Status status;
-  uint8_t *image_buffer = (uint8_t *)image_in.c_str();
+thread_local const val Uint8Array = val::global("Uint8Array");
+
+val encode(std::string image_in, int image_width, int image_height, WP2::EncoderConfig config) {
+  uint8_t* image_buffer = (uint8_t*)image_in.c_str();
   WP2::ArgbBuffer src = WP2::ArgbBuffer();
-  status = src.Import(WP2_rgbA_32, // Format. WP2_RGBA_32 is the same but NOT
-                                   // premultiplied alpha
-                      image_width, image_height, image_buffer, 4 * image_width);
+  WP2Status status =
+      src.Import(WP2_rgbA_32,  // Format. WP2_RGBA_32 is the same but NOT premultiplied alpha
+                 image_width, image_height, image_buffer, 4 * image_width);
   if (status != WP2_STATUS_OK) {
     return val::null();
   }
@@ -23,8 +23,7 @@ val encode(std::string image_in, int image_width, int image_height,
     return val::null();
   }
 
-  return val(typed_memory_view(memory_writer.size_, memory_writer.mem_));
-  // Lol I forgot to add the free here.
+  return Uint8Array.new_(typed_memory_view(memory_writer.size_, memory_writer.mem_));
 }
 
 EMSCRIPTEN_BINDINGS(my_module) {
diff --git a/codecs/wp2/enc/wp2_enc.d.ts b/codecs/wp2/enc/wp2_enc.d.ts
index 04949538..76a2cf11 100644
--- a/codecs/wp2/enc/wp2_enc.d.ts
+++ b/codecs/wp2/enc/wp2_enc.d.ts
@@ -1,8 +1,7 @@
-import { EncodeOptions } from '../../src/codecs/wp2/encoder-meta';
+import { EncodeOptions } from '../../../src/codecs/wp2/encoder-meta';
 
 interface WP2Module extends EmscriptenWasm.Module {
-  encode(data: BufferSource, width: number, height: number, options: EncodeOptions): Uint8Array;
-  free_result(): void;
+  encode(data: BufferSource, width: number, height: number, options: EncodeOptions): Uint8Array | null;
 }
 
 export default function(opts: EmscriptenWasm.ModuleOpts): Promise<WP2Module>;
diff --git a/codecs/wp2/enc/wp2_enc.js b/codecs/wp2/enc/wp2_enc.js
index e59f9e53..55d8a412 100644
--- a/codecs/wp2/enc/wp2_enc.js
+++ b/codecs/wp2/enc/wp2_enc.js
@@ -11,51 +11,53 @@ var c;c||(c=typeof wp2_enc !== 'undefined' ? wp2_enc : {});var aa,ba;c.ready=new
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 function oa(a,b){var d=a>>1;for(var e=d+b/2;!(d>=e)&&J[d];)++d;d<<=1;if(32<d-a&&na)return na.decode(I.subarray(a,d));d=0;for(e="";;){var f=K[a+2*d>>1];if(0==f||d==b/2)return e;++d;e+=String.fromCharCode(f)}}function pa(a,b,d){void 0===d&&(d=2147483647);if(2>d)return 0;d-=2;var e=b;d=d<2*a.length?d/2:a.length;for(var f=0;f<d;++f)K[b>>1]=a.charCodeAt(f),b+=2;K[b>>1]=0;return b-e}function qa(a){return 2*a.length}
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+function La(){try{if(E)return new Uint8Array(E);if(B)return B(Q);throw"both async and sync fetching of the wasm failed";}catch(a){C(a)}}function Ma(){return E||!u&&!v||"function"!==typeof fetch||Ia("file://")?new Promise(function(a){a(La())}):fetch(Q,{credentials:"same-origin"}).then(function(a){if(!a.ok)throw"failed to load wasm binary file at '"+Q+"'";return a.arrayBuffer()}).catch(function(){return La()})}Ba.push({pa:function(){Na()}});function Oa(){return 0<Oa.ma}var Pa={};
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-{name:b,fromWireType:function(e){return e},toWireType:function(e,f){if("number"!==typeof f&&"boolean"!==typeof f)throw new TypeError('Cannot convert "'+db(f)+'" to '+this.name);return f},argPackAdvance:8,readValueFromPointer:eb(b,d),ga:null})},q:function(a,b,d,e,f,g){var l=ib(b,d);a=U(a);f=Y(e,f);hb(a,function(){mb("Cannot call "+a+" due to unbound types",l)},b-1);Xa([],l,function(k){var h=[k[0],null].concat(k.slice(1)),m=k=a,n=f,q=h.length;2>q&&V("argTypes array size mismatch! Must at least get return value and 'this' types!");
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-c.run=vb;if(c.preInit)for("function"==typeof c.preInit&&(c.preInit=[c.preInit]);0<c.preInit.length;)c.preInit.pop()();noExitRuntime=!0;vb();
+var Na=c.___wasm_call_ctors=function(){return(Na=c.___wasm_call_ctors=c.asm.I).apply(null,arguments)},vb=c._malloc=function(){return(vb=c._malloc=c.asm.J).apply(null,arguments)},Z=c._free=function(){return(Z=c._free=c.asm.K).apply(null,arguments)},lb=c.___getTypeName=function(){return(lb=c.___getTypeName=c.asm.L).apply(null,arguments)};c.___embind_register_native_and_builtin_types=function(){return(c.___embind_register_native_and_builtin_types=c.asm.M).apply(null,arguments)};
+c.dynCall_i=function(){return(c.dynCall_i=c.asm.N).apply(null,arguments)};c.dynCall_vi=function(){return(c.dynCall_vi=c.asm.O).apply(null,arguments)};c.dynCall_fii=function(){return(c.dynCall_fii=c.asm.P).apply(null,arguments)};c.dynCall_viif=function(){return(c.dynCall_viif=c.asm.Q).apply(null,arguments)};c.dynCall_iii=function(){return(c.dynCall_iii=c.asm.R).apply(null,arguments)};c.dynCall_viii=function(){return(c.dynCall_viii=c.asm.S).apply(null,arguments)};
+c.dynCall_iiiiii=function(){return(c.dynCall_iiiiii=c.asm.T).apply(null,arguments)};c.dynCall_viiiii=function(){return(c.dynCall_viiiii=c.asm.U).apply(null,arguments)};c.dynCall_vii=function(){return(c.dynCall_vii=c.asm.V).apply(null,arguments)};c.dynCall_viiiiiii=function(){return(c.dynCall_viiiiiii=c.asm.W).apply(null,arguments)};c.dynCall_viiiiiiiii=function(){return(c.dynCall_viiiiiiiii=c.asm.X).apply(null,arguments)};c.dynCall_ii=function(){return(c.dynCall_ii=c.asm.Y).apply(null,arguments)};
+c.dynCall_viiiiiiii=function(){return(c.dynCall_viiiiiiii=c.asm.Z).apply(null,arguments)};c.dynCall_viiii=function(){return(c.dynCall_viiii=c.asm._).apply(null,arguments)};c.dynCall_viiiiii=function(){return(c.dynCall_viiiiii=c.asm.$).apply(null,arguments)};c.dynCall_iidiiii=function(){return(c.dynCall_iidiiii=c.asm.aa).apply(null,arguments)};c.dynCall_iiiii=function(){return(c.dynCall_iiiii=c.asm.ba).apply(null,arguments)};c.dynCall_v=function(){return(c.dynCall_v=c.asm.ca).apply(null,arguments)};
+c.dynCall_fi=function(){return(c.dynCall_fi=c.asm.da).apply(null,arguments)};c.dynCall_iiii=function(){return(c.dynCall_iiii=c.asm.ea).apply(null,arguments)};c.dynCall_iiiiiiiiii=function(){return(c.dynCall_iiiiiiiiii=c.asm.fa).apply(null,arguments)};c.dynCall_jiji=function(){return(c.dynCall_jiji=c.asm.ga).apply(null,arguments)};var xb;P=function yb(){xb||zb();xb||(P=yb)};
+function zb(){function a(){if(!xb&&(xb=!0,c.calledRun=!0,!ka)){za(Ba);za(Ca);aa(c);if(c.onRuntimeInitialized)c.onRuntimeInitialized();if(c.postRun)for("function"==typeof c.postRun&&(c.postRun=[c.postRun]);c.postRun.length;){var b=c.postRun.shift();Da.unshift(b)}za(Da)}}if(!(0<O)){if(c.preRun)for("function"==typeof c.preRun&&(c.preRun=[c.preRun]);c.preRun.length;)Ea();za(Aa);0<O||(c.setStatus?(c.setStatus("Running..."),setTimeout(function(){setTimeout(function(){c.setStatus("")},1);a()},1)):a())}}
+c.run=zb;if(c.preInit)for("function"==typeof c.preInit&&(c.preInit=[c.preInit]);0<c.preInit.length;)c.preInit.pop()();noExitRuntime=!0;zb();
 
 
   return wp2_enc.ready
diff --git a/codecs/wp2/enc/wp2_enc.wasm b/codecs/wp2/enc/wp2_enc.wasm
index ffa99ef4..43a1d1c9 100644
Binary files a/codecs/wp2/enc/wp2_enc.wasm and b/codecs/wp2/enc/wp2_enc.wasm differ
diff --git a/src/codecs/wp2/decoder.ts b/src/codecs/wp2/decoder.ts
index a6d7ea59..b1f9405c 100644
--- a/src/codecs/wp2/decoder.ts
+++ b/src/codecs/wp2/decoder.ts
@@ -8,13 +8,9 @@ export async function decode(data: ArrayBuffer): Promise<ImageData> {
   if (!emscriptenModule) emscriptenModule = initEmscriptenModule(wp2_dec, wasmUrl);
 
   const module = await emscriptenModule;
-  const rawImage = module.decode(data);
-  const result = new ImageData(
-    new Uint8ClampedArray(rawImage.buffer),
-    rawImage.width,
-    rawImage.height,
-  );
-
-  module.free_result();
+  const result = module.decode(data);
+  if (!result) {
+    throw new Error('Decoding error');
+  }
   return result;
 }
diff --git a/src/codecs/wp2/encoder.ts b/src/codecs/wp2/encoder.ts
index 4e8538a3..2a10dada 100644
--- a/src/codecs/wp2/encoder.ts
+++ b/src/codecs/wp2/encoder.ts
@@ -9,8 +9,11 @@ export async function encode(data: ImageData, options: EncodeOptions): Promise<A
   if (!emscriptenModule) emscriptenModule = initEmscriptenModule(wp2_enc, wasmUrl);
 
   const module = await emscriptenModule;
-  const resultView = module.encode(data.data, data.width, data.height, options);
-  const result = new Uint8Array(resultView);
+  const result = module.encode(data.data, data.width, data.height, options);
+
+  if (!result) {
+    throw new Error('Encoding error');
+  }
 
   // wasm can’t run on SharedArrayBuffers, so we hard-cast to ArrayBuffer.
   return result.buffer as ArrayBuffer;