diff --git a/codecs/basis/enc/basis_enc.cpp b/codecs/basis/enc/basis_enc.cpp
index 8bdcdf31..251f3a5b 100644
--- a/codecs/basis/enc/basis_enc.cpp
+++ b/codecs/basis/enc/basis_enc.cpp
@@ -9,6 +9,9 @@ using namespace basisu;
 
 struct BasisOptions {
   uint8_t quality;
+  uint8_t compression;
+  bool uastc;
+  bool mipmap;
 };
 
 thread_local const val Uint8Array = val::global("Uint8Array");
@@ -24,11 +27,13 @@ val encode(std::string image_in, int image_width, int image_height, BasisOptions
   params.m_read_source_images = false;
   // Writing is unnecessary, too
   params.m_read_source_images = false;
-  // Generate .basis file
-  params.m_uastc = true;
   // No printf pls
   params.m_status_output = false;
-  params.m_compression_level = opts.quality;
+  // True => UASTC, False => ETC1S
+  params.m_uastc = opts.uastc;
+  params.m_mip_gen = opts.mipmap;
+  params.m_quality_level = opts.quality;
+  params.m_compression_level = opts.compression;
   params.m_source_images.push_back(img);
 
   if (!compressor.init(params)) {
@@ -46,7 +51,11 @@ val encode(std::string image_in, int image_width, int image_height, BasisOptions
 }
 
 EMSCRIPTEN_BINDINGS(my_module) {
-  value_object<BasisOptions>("BasisOptions").field("quality", &BasisOptions::quality);
+  value_object<BasisOptions>("BasisOptions")
+    .field("quality", &BasisOptions::quality)
+    .field("compression", &BasisOptions::compression)
+    .field("uastc", &BasisOptions::uastc)
+    .field("mipmap", &BasisOptions::mipmap);
 
   function("encode", &encode);
 }
diff --git a/codecs/basis/enc/basis_enc.d.ts b/codecs/basis/enc/basis_enc.d.ts
index bed974a3..9f5719cd 100644
--- a/codecs/basis/enc/basis_enc.d.ts
+++ b/codecs/basis/enc/basis_enc.d.ts
@@ -1,5 +1,8 @@
 export interface EncodeOptions {
   quality: number;
+  compression: number;
+  uastc: boolean;
+  mipmap: boolean;
 }
 
 export interface BasisModule extends EmscriptenWasm.Module {
diff --git a/codecs/basis/enc/basis_enc.js b/codecs/basis/enc/basis_enc.js
index 7ad8cc87..02f0ae72 100644
--- a/codecs/basis/enc/basis_enc.js
+++ b/codecs/basis/enc/basis_enc.js
@@ -8,54 +8,51 @@ function(Module) {
 
 
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+for(var x=null!==h[1]&&!1,y=!1,p=1;p<h.length;++p)if(null!==h[p]&&void 0===h[p].ba){y=!0;break}var fa="void"!==h[0].name,z="",H="";for(p=0;p<q-2;++p)z+=(0!==p?", ":"")+"arg"+p,H+=(0!==p?", ":"")+"arg"+p+"Wired";l="return function "+Oa(l)+"("+z+") {\nif (arguments.length !== "+(q-2)+") {\nthrowBindingError('function "+l+" called with ' + arguments.length + ' arguments, expected "+(q-2)+" args!');\n}\n";y&&(l+="var destructors = [];\n");var X=y?"destructors":"null";z="throwBindingError invoker fn runDestructors retType classParam".split(" ");
+n=[R,n,g,La,h[0],h[1]];x&&(l+="var thisWired = classParam.toWireType("+X+", this);\n");for(p=0;p<q-2;++p)l+="var arg"+p+"Wired = argType"+p+".toWireType("+X+", arg"+p+"); // "+h[p+2].name+"\n",z.push("argType"+p),n.push(h[p+2]);x&&(H="thisWired"+(0<H.length?", ":"")+H);l+=(fa?"var rv = ":"")+"invoker(fn"+(0<H.length?", ":"")+H+");\n";if(y)l+="runDestructors(destructors);\n";else for(p=x?1:2;p<h.length;++p)q=1===p?"thisWired":"arg"+(p-2)+"Wired",null!==h[p].ba&&(l+=q+"_dtor("+q+"); // "+h[p].name+
+"\n",z.push(q+"_dtor"),n.push(h[p].ba));fa&&(l+="var ret = retType.fromWireType(rv);\nreturn ret;\n");z.push(l+"}\n");h=$a(z).apply(null,n);p=b-1;if(!f.hasOwnProperty(k))throw new Ra("Replacing nonexistant public symbol");void 0!==f[k].aa&&void 0!==p?f[k].aa[p]=h:(f[k]=h,f[k].ga=p);return[]})},f:function(a,b,c,d,e){function g(l){return l}b=Q(b);-1===e&&(e=4294967295);var m=Ta(c);if(0===d){var h=32-8*c;g=function(l){return l<<h>>>h}}var k=b.includes("unsigned");P(a,{name:b,fromWireType:g,toWireType:function(l,
+n){if("number"!==typeof n&&"boolean"!==typeof n)throw new TypeError('Cannot convert "'+Ya(n)+'" to '+this.name);if(n<d||n>e)throw new TypeError('Passing a number "'+Ya(n)+'" from JS side to C/C++ side to an argument of type "'+b+'", which is outside the valid range ['+d+", "+e+"]!");return k?n>>>0:n|0},argPackAdvance:8,readValueFromPointer:ib(b,m,0!==d),ba:null})},e:function(a,b,c){function d(g){g>>=2;var m=I;return new e(sa,m[g+1],m[g])}var e=[Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,
+Uint32Array,Float32Array,Float64Array][b];c=Q(c);P(a,{name:c,fromWireType:d,argPackAdvance:8,readValueFromPointer:d},{la:!0})},r:function(a,b){b=Q(b);var c="std::string"===b;P(a,{name:b,fromWireType:function(d){var e=I[d>>2];if(c)for(var g=d+4,m=0;m<=e;++m){var h=d+4+m;if(m==e||0==C[h]){g=B(g,h-g);if(void 0===k)var k=g;else k+=String.fromCharCode(0),k+=g;g=h+1}}else{k=Array(e);for(m=0;m<e;++m)k[m]=String.fromCharCode(C[d+4+m]);k=k.join("")}V(d);return k},toWireType:function(d,e){e instanceof ArrayBuffer&&
+(e=new Uint8Array(e));var g="string"===typeof e;g||e instanceof Uint8Array||e instanceof Uint8ClampedArray||e instanceof Int8Array||R("Cannot pass non-string to std::string");var m=(c&&g?function(){for(var l=0,n=0;n<e.length;++n){var q=e.charCodeAt(n);55296<=q&&57343>=q&&(q=65536+((q&1023)<<10)|e.charCodeAt(++n)&1023);127>=q?++l:l=2047>=q?l+2:65535>=q?l+3:l+4}return l}:function(){return e.length})(),h=pb(4+m+1);I[h>>2]=m;if(c&&g)ka(e,h+4,m+1);else if(g)for(g=0;g<m;++g){var k=e.charCodeAt(g);255<k&&
+(V(h),R("String has UTF-16 code units that do not fit in 8 bits"));C[h+4+g]=k}else for(g=0;g<m;++g)C[h+4+g]=e[g];null!==d&&d.push(V,h);return h},argPackAdvance:8,readValueFromPointer:Ma,ba:function(d){V(d)}})},j:function(a,b,c){c=Q(c);if(2===b){var d=ma;var e=na;var g=oa;var m=function(){return D};var h=1}else 4===b&&(d=pa,e=qa,g=ra,m=function(){return I},h=2);P(a,{name:c,fromWireType:function(k){for(var l=I[k>>2],n=m(),q,x=k+4,y=0;y<=l;++y){var p=k+4+y*b;if(y==l||0==n[p>>h])x=d(x,p-x),void 0===q?
+q=x:(q+=String.fromCharCode(0),q+=x),x=p+b}V(k);return q},toWireType:function(k,l){"string"!==typeof l&&R("Cannot pass non-string to C++ string type "+c);var n=g(l),q=pb(4+n+b);I[q>>2]=n>>h;e(l,q+4,n+b);null!==k&&k.push(V,q);return q},argPackAdvance:8,readValueFromPointer:Ma,ba:function(k){V(k)}})},K:function(a,b,c,d,e,g){Ka[a]={name:Q(b),na:U(c,d),oa:U(e,g),fa:[]}},i:function(a,b,c,d,e,g,m,h,k,l){Ka[a].fa.push({ha:Q(b),ka:c,ia:U(d,e),ja:g,va:m,ua:U(h,k),wa:l})},F:function(a,b){b=Q(b);P(a,{Aa:!0,
+name:b,argPackAdvance:0,fromWireType:function(){},toWireType:function(){}})},k:Xa,N:function(a){if(0===a)return T(kb());var b=jb[a];a=void 0===b?Q(a):b;return T(kb()[a])},G:function(a){4<a&&(S[a].ea+=1)},L:function(a,b,c,d){a||R("Cannot use deleted val. handle = "+a);a=S[a].value;var e=mb[b];if(!e){e="";for(var g=0;g<b;++g)e+=(0!==g?", ":"")+"arg"+g;var m="return function emval_allocator_"+b+"(constructor, argTypes, args) {\n";for(g=0;g<b;++g)m+="var argType"+g+" = requireRegisteredType(Module['HEAP32'][(argTypes >>> 2) + "+
+g+'], "parameter '+g+'");\nvar arg'+g+" = argType"+g+".readValueFromPointer(args);\nargs += argType"+g+"['argPackAdvance'];\n";e=(new Function("requireRegisteredType","Module","__emval_register",m+("var obj = new constructor("+e+");\nreturn __emval_register(obj);\n}\n")))(lb,f,T);mb[b]=e}return e(a,c,d)},s:function(a,b){a=lb(a,"_emval_take_value");a=a.readValueFromPointer(b);return T(a)},b:function(){A()},y:function(){return 2147483648},g:function(a,b){W(a,b||1);throw"longjmp";},w:function(a,b,c){C.copyWithin(a,
+b,b+c)},x:function(a){var b=C.length;a>>>=0;if(2147483648<a)return!1;for(var c=1;4>=c;c*=2){var d=b*(1+.2/c);d=Math.min(d,a+100663296);d=Math.max(a,d);0<d%65536&&(d+=65536-d%65536);a:{try{ha.grow(Math.min(2147483648,d)-sa.byteLength+65535>>>16);va();var e=1;break a}catch(g){}e=void 0}if(e)return!0}return!1},p:function(){return 0},z:function(a,b,c,d){a=Ja.za(a);b=Ja.xa(a,b,c);F[d>>2]=b;return 0},u:function(){},o:function(a,b,c,d){for(var e=0,g=0;g<c;g++){for(var m=F[b+8*g>>2],h=F[b+(8*g+4)>>2],k=0;k<
+h;k++){var l=C[m+k],n=Ia[a];if(0===l||10===l){for(l=0;n[l]&&!(NaN<=l);)++l;l=ja.decode(n.subarray?n.subarray(0,l):new Uint8Array(n.slice(0,l)));(1===a?da:v)(l);n.length=0}else n.push(l)}e+=h}F[d>>2]=e;return 0},d:function(){return ea},l:function(a){var b=Date.now();F[a>>2]=b/1E3|0;F[a+4>>2]=b%1E3*1E3|0;return 0},t:qb,m:rb,h:sb,O:tb,P:ub,c:function(a){ea=a}};
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+a)}catch(e){return v("Module.instantiateWasm callback failed with error: "+e),!1}(function(){return w||"function"!==typeof WebAssembly.instantiateStreaming||Ba()||"function"!==typeof fetch?c(b):fetch(M,{credentials:"same-origin"}).then(function(e){return WebAssembly.instantiateStreaming(e,d).then(b,function(g){v("wasm streaming compile failed: "+g);v("falling back to ArrayBuffer instantiation");return c(b)})})})().catch(ba);return{}})();
+f.___wasm_call_ctors=function(){return(f.___wasm_call_ctors=f.asm.R).apply(null,arguments)};var V=f._free=function(){return(V=f._free=f.asm.S).apply(null,arguments)},pb=f._malloc=function(){return(pb=f._malloc=f.asm.T).apply(null,arguments)},gb=f.___getTypeName=function(){return(gb=f.___getTypeName=f.asm.V).apply(null,arguments)};f.___embind_register_native_and_builtin_types=function(){return(f.___embind_register_native_and_builtin_types=f.asm.W).apply(null,arguments)};
+var Y=f.stackSave=function(){return(Y=f.stackSave=f.asm.X).apply(null,arguments)},Z=f.stackRestore=function(){return(Z=f.stackRestore=f.asm.Y).apply(null,arguments)},W=f._setThrew=function(){return(W=f._setThrew=f.asm.Z).apply(null,arguments)};f.dynCall_jiiii=function(){return(f.dynCall_jiiii=f.asm._).apply(null,arguments)};f.dynCall_jiji=function(){return(f.dynCall_jiji=f.asm.$).apply(null,arguments)};
+function sb(a,b){var c=Y();try{J.get(a)(b)}catch(d){Z(c);if(d!==d+0&&"longjmp"!==d)throw d;W(1,0)}}function rb(a,b,c){var d=Y();try{return J.get(a)(b,c)}catch(e){Z(d);if(e!==e+0&&"longjmp"!==e)throw e;W(1,0)}}function qb(a,b){var c=Y();try{return J.get(a)(b)}catch(d){Z(c);if(d!==d+0&&"longjmp"!==d)throw d;W(1,0)}}function ub(a,b,c,d){var e=Y();try{J.get(a)(b,c,d)}catch(g){Z(e);if(g!==g+0&&"longjmp"!==g)throw g;W(1,0)}}
+function tb(a,b,c){var d=Y();try{J.get(a)(b,c)}catch(e){Z(d);if(e!==e+0&&"longjmp"!==e)throw e;W(1,0)}}var wb;L=function xb(){wb||yb();wb||(L=xb)};
+function yb(){function a(){if(!wb&&(wb=!0,f.calledRun=!0,!ia)){Fa(xa);aa(f);if(f.onRuntimeInitialized)f.onRuntimeInitialized();if(f.postRun)for("function"==typeof f.postRun&&(f.postRun=[f.postRun]);f.postRun.length;){var b=f.postRun.shift();ya.unshift(b)}Fa(ya)}}if(!(0<K)){if(f.preRun)for("function"==typeof f.preRun&&(f.preRun=[f.preRun]);f.preRun.length;)za();Fa(wa);0<K||(f.setStatus?(f.setStatus("Running..."),setTimeout(function(){setTimeout(function(){f.setStatus("")},1);a()},1)):a())}}f.run=yb;
+if(f.preInit)for("function"==typeof f.preInit&&(f.preInit=[f.preInit]);0<f.preInit.length;)f.preInit.pop()();yb();
 
 
   return Module.ready
diff --git a/codecs/basis/enc/basis_enc.wasm b/codecs/basis/enc/basis_enc.wasm
index 2f181f24..407194d4 100755
Binary files a/codecs/basis/enc/basis_enc.wasm and b/codecs/basis/enc/basis_enc.wasm differ
diff --git a/src/features/encoders/basis/client/index.tsx b/src/features/encoders/basis/client/index.tsx
index d3296578..bee1bec5 100644
--- a/src/features/encoders/basis/client/index.tsx
+++ b/src/features/encoders/basis/client/index.tsx
@@ -46,9 +46,19 @@ export class Options extends Component<Props, State> {
     const newOptions: EncodeOptions = {
       // Copy over options the form doesn't currently care about, eg arithmetic
       ...this.props.options,
+      uastc: inputFieldChecked(
+        form.uastc,
+        options.uastc,
+      ),
+      mipmap: inputFieldChecked(
+        form.mipmap,
+        options.mipmap,
+      ),
       // .value
       quality: inputFieldValueAsNumber(form.quality, options.quality),
+      compression: inputFieldValueAsNumber(form.compression, options.compression),
     };
+    console.log({newOptions});
     this.props.onChange(newOptions);
   };
 
@@ -60,14 +70,25 @@ export class Options extends Component<Props, State> {
         <div class={style.optionOneCell}>
           <Range
             name="quality"
-            min="0"
-            max="4"
+            min="1"
+            max="255"
             value={options.quality}
             onInput={this.onChange}
           >
             Quality:
           </Range>
         </div>
+        <div class={style.optionOneCell}>
+          <Range
+            name="compression"
+            min="0"
+            max="4"
+            value={options.compression}
+            onInput={this.onChange}
+          >
+            Compression:
+          </Range>
+        </div>
         <label class={style.optionReveal}>
           <Revealer
             checked={showAdvanced}
@@ -75,7 +96,25 @@ export class Options extends Component<Props, State> {
           />
           Advanced settings
         </label>
-        <Expander>{showAdvanced ? <div>Nothing here yet</div> : null}</Expander>
+          <Expander>{showAdvanced ? (<div>
+          <label class={style.optionToggle}>
+            UASTC 
+                      <Checkbox
+                        name="uastc"
+                        checked={options.uastc}
+                        onChange={this.onChange}
+                      />
+                    </label>
+          <label class={style.optionToggle}>
+            Embed Mipmaps 
+                      <Checkbox
+                        name="mipmap"
+                        checked={options.mipmap}
+                        onChange={this.onChange}
+                      />
+                    </label>
+
+        </div>) : null}</Expander>
       </form>
     );
   }
diff --git a/src/features/encoders/basis/shared/meta.ts b/src/features/encoders/basis/shared/meta.ts
index b044d41a..9230ec09 100644
--- a/src/features/encoders/basis/shared/meta.ts
+++ b/src/features/encoders/basis/shared/meta.ts
@@ -18,5 +18,8 @@ export const label = 'Basis';
 export const mimeType = 'image/basisu';
 export const extension = 'basis';
 export const defaultOptions: EncodeOptions = {
-  quality: 2,
+  quality: 128,
+  compression: 2,
+  uastc: false,
+  mipmap: false,
 };