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index 5f4b0d3..a900249 100644
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+body{font-family:sans-serif}#iframe{border:0;position:absolute;top:0;left:0;width:100%;height:100%}#edit{font-family:monospace;font-weight:bold;color:rgba(0,0,0,0.54);position:absolute;z-index:100;position:absolute;top:.85em;right:1em;display:none}#edit:not(:hover){text-decoration:none}#warning{position:absolute;border-radius:4px;background-color:#feecc2;padding:1em;font-size:16px;width:20em;z-index:100;top:10vh;left:50vw;margin-left:-10em}#warning:empty{display:none}body.toasting #iframe,body.toasting #edit{opacity:.5;pointer-events:none}body.toasting #toast{box-sizing:border-box;background-color:#feecc2;border-radius:4px;font-size:13px;left:50%;top:10px;margin-left:-160px;padding:1em;position:absolute;max-width:320px;z-index:101}body:not(.toasting) #toast,body.toasting #warning{display:none}body:not(.download) #download{display:none}#download{background:#fafafa;width:100vw;height:100vh;position:absolute;top:0;left:0;display:flex;text-decoration:none;color:black;justify-content:center;align-items:center;flex-direction:column;font-size:14px}#dl-image{width:128px;height:128px;background-position:center;background-repeat:no-repeat;background-image:url("data:image/svg+xml,%0A%3Csvg width='128' height='128' viewBox='0 0 128 128' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cmask id='path-1-outside-1_116_2' maskUnits='userSpaceOnUse' x='27' y='15' width='74' height='98' fill='black'%3E%3Crect fill='white' x='27' y='15' width='74' height='98'/%3E%3Cpath d='M80 16H28V112H100V36L80 16Z'/%3E%3C/mask%3E%3Cpath d='M80 16H28V112H100V36L80 16Z' fill='white'/%3E%3Cpath d='M28 16V15H27V16H28ZM80 16L80.7071 15.2929L80.4142 15H80V16ZM28 112H27V113H28V112ZM100 112V113H101V112H100ZM100 36H101V35.5858L100.707 35.2929L100 36ZM28 17H80V15H28V17ZM29 112V16H27V112H29ZM100 111H28V113H100V111ZM99 36V112H101V36H99ZM100.707 35.2929L80.7071 15.2929L79.2929 16.7071L99.2929 36.7071L100.707 35.2929Z' fill='black' fill-opacity='0.15' mask='url(%23path-1-outside-1_116_2)'/%3E%3C/svg%3E%0A");padding:20px 32px;box-sizing:border-box;display:flex;justify-content:center;align-items:center;color:rgba(0,0,0,0.3);font-weight:bold}#dl-button{text-decoration:none;background:gray;color:white;padding:.5em 1em;border-radius:2em;display:none}#dl-button:hover{background:black}#dl-name{margin-bottom:2em}
 </style>
 <noscript>To use itty.bitty, please enable JavaScript.</noscript>
 <div id="toast">itty.bitty is experimental technology that renders linked content from outside sources. <a href="http://toast.bitty.site" target="_blank">Learn&nbsp;more</a>.
@@ -15,4 +15,5 @@ you would show any insecure web page.
 <iframe id="iframe"></iframe>
 <div id="warning"></div>
 <a id="edit">edit</a>
+<a id="download"><div id="dl-image"></div><div id="dl-name"></div><div id="dl-button">Download</div></a>
 </html>
diff --git a/docs/index.src/index-min.css b/docs/index.src/index-min.css
index a5b1624..f86f66c 100644
--- a/docs/index.src/index-min.css
+++ b/docs/index.src/index-min.css
@@ -1 +1 @@
-body{font-family:sans-serif}#iframe{border:0;position:absolute;top:0;left:0;width:100%;height:100%}#edit{font-family:monospace;font-weight:bold;color:rgba(0,0,0,0.54);position:absolute;z-index:100;position:absolute;top:.85em;right:1em;display:none}#edit:not(:hover){text-decoration:none}#warning{position:absolute;border-radius:4px;background-color:#feecc2;padding:1em;font-size:16px;width:20em;z-index:100;top:10vh;left:50vw;margin-left:-10em}#warning:empty{display:none}body.toasting #iframe,body.toasting #edit{opacity:.5;pointer-events:none}body.toasting #toast{box-sizing:border-box;background-color:#feecc2;border-radius:4px;font-size:13px;left:50%;top:10px;margin-left:-160px;padding:1em;position:absolute;max-width:320px;z-index:101}body:not(.toasting) #toast,body.toasting #warning{display:none}
+body{font-family:sans-serif}#iframe{border:0;position:absolute;top:0;left:0;width:100%;height:100%}#edit{font-family:monospace;font-weight:bold;color:rgba(0,0,0,0.54);position:absolute;z-index:100;position:absolute;top:.85em;right:1em;display:none}#edit:not(:hover){text-decoration:none}#warning{position:absolute;border-radius:4px;background-color:#feecc2;padding:1em;font-size:16px;width:20em;z-index:100;top:10vh;left:50vw;margin-left:-10em}#warning:empty{display:none}body.toasting #iframe,body.toasting #edit{opacity:.5;pointer-events:none}body.toasting #toast{box-sizing:border-box;background-color:#feecc2;border-radius:4px;font-size:13px;left:50%;top:10px;margin-left:-160px;padding:1em;position:absolute;max-width:320px;z-index:101}body:not(.toasting) #toast,body.toasting #warning{display:none}body:not(.download) #download{display:none}#download{background:#fafafa;width:100vw;height:100vh;position:absolute;top:0;left:0;display:flex;text-decoration:none;color:black;justify-content:center;align-items:center;flex-direction:column;font-size:14px}#dl-image{width:128px;height:128px;background-position:center;background-repeat:no-repeat;background-image:url("data:image/svg+xml,%0A%3Csvg width='128' height='128' viewBox='0 0 128 128' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cmask id='path-1-outside-1_116_2' maskUnits='userSpaceOnUse' x='27' y='15' width='74' height='98' fill='black'%3E%3Crect fill='white' x='27' y='15' width='74' height='98'/%3E%3Cpath d='M80 16H28V112H100V36L80 16Z'/%3E%3C/mask%3E%3Cpath d='M80 16H28V112H100V36L80 16Z' fill='white'/%3E%3Cpath d='M28 16V15H27V16H28ZM80 16L80.7071 15.2929L80.4142 15H80V16ZM28 112H27V113H28V112ZM100 112V113H101V112H100ZM100 36H101V35.5858L100.707 35.2929L100 36ZM28 17H80V15H28V17ZM29 112V16H27V112H29ZM100 111H28V113H100V111ZM99 36V112H101V36H99ZM100.707 35.2929L80.7071 15.2929L79.2929 16.7071L99.2929 36.7071L100.707 35.2929Z' fill='black' fill-opacity='0.15' mask='url(%23path-1-outside-1_116_2)'/%3E%3C/svg%3E%0A");padding:20px 32px;box-sizing:border-box;display:flex;justify-content:center;align-items:center;color:rgba(0,0,0,0.3);font-weight:bold}#dl-button{text-decoration:none;background:gray;color:white;padding:.5em 1em;border-radius:2em;display:none}#dl-button:hover{background:black}#dl-name{margin-bottom:2em}
diff --git a/docs/index.src/index-min.js b/docs/index.src/index-min.js
index 53ae692..5f24b0f 100644
--- a/docs/index.src/index-min.js
+++ b/docs/index.src/index-min.js
@@ -1 +1 @@
-var HEAD_TAGS="PGJhc2UgdGFyZ2V0PSJfdG9wIj4K";var HEAD_TAGS_EXTENDED="PG1ldGEgY2hhcnNldD0idXRmLTgiPjxtZXRhIG5hbWU9InZpZXdwb3J0IiBjb250ZW50PSJ3aWR0aD1kZXZpY2Utd2lkdGgiPjxiYXNlIHRhcmdldD0iX3RvcCI+PHN0eWxlIHR5cGU9InRleHQvY3NzIj5ib2R5e21hcmdpbjowIGF1dG87cGFkZGluZzoxMnZtaW4gMTB2bWluO21heC13aWR0aDozNWVtO2xpbmUtaGVpZ2h0OjEuNWVtO2ZvbnQtZmFtaWx5OiAtYXBwbGUtc3lzdGVtLEJsaW5rTWFjU3lzdGVtRm9udCxzYW5zLXNlcmlmO3dvcmQtd3JhcDogYnJlYWstd29yZDt9PC9zdHlsZT4g";function dismiss(){if(document.getElementById("never").checked)window.localStorage.setItem("toasted",true);document.body.classList.remove("toasting")}window.onhashchange=window.onload=function(){var hash=window.location.hash.substring(1);if(hash.length<3){location.href="/edit"}else{var iframe=document.getElementById("iframe");var link=document.getElementById("edit");var preamble=undefined;var slashIndex=hash.indexOf("/");var title=hash.substring(0,slashIndex);document.title=title.length?decodeURIComponent(title.replace(/_/g," ")):location.hostname;hash=hash.substring(slashIndex+1);var editable=hash.charAt(0)=="?";if(editable){hash=hash.substring(1)}if(hash.indexOf("data:")!=0){var colon=hash.indexOf(":");if(colon>0&&colon<15){document.body.classList.remove("toasting");return window.location.replace(hash)}var compressed=true;preamble=HEAD_TAGS_EXTENDED;hash="data:text/html;charset=utf-8;"+(compressed?"bxze64,":"base64,")+hash}else if(hash.indexOf("data:text/html;")==0){preamble=HEAD_TAGS}else if(hash.indexOf("data:text/plain;")==0){preamble=HEAD_TAGS_EXTENDED}link.onclick=function(){location.href="/edit"+location.hash};var isIE=navigator.userAgent.match(/rv:11/);var isEdge=navigator.userAgent.match(/Edge\//);if((isEdge||isIE)&&location.href.length==2083){document.getElementById("warning").innerHTML='Edge only supports shorter URLs (maximum 2083 bytes).<br>Larger sites may require a different browser.<br><a href="http://reference.bitty.site">Learn more</a>'}decompressDataURI(hash,preamble,(function(hash){if(!hash)return;iframe.sandbox="allow-downloads allow-scripts allow-forms allow-top-navigation allow-popups allow-modals allow-popups-to-escape-sandbox";if(!isIE){if(hash)iframe.src=hash}else{dataToString(hash,(function(content){var doc=iframe.contentWindow.document;doc.open();doc.write(content);doc.close()}))}}));var link=document.getElementById("edit");link.href="/edit"+location.hash;link.style.display=editable?"block":"none"}};
+var HEAD_TAGS="PGJhc2UgdGFyZ2V0PSJfdG9wIj4K";var HEAD_TAGS_EXTENDED="PG1ldGEgY2hhcnNldD0idXRmLTgiPjxtZXRhIG5hbWU9InZpZXdwb3J0IiBjb250ZW50PSJ3aWR0aD1kZXZpY2Utd2lkdGgiPjxiYXNlIHRhcmdldD0iX3RvcCI+PHN0eWxlIHR5cGU9InRleHQvY3NzIj5ib2R5e21hcmdpbjowIGF1dG87cGFkZGluZzoxMnZtaW4gMTB2bWluO21heC13aWR0aDozNWVtO2xpbmUtaGVpZ2h0OjEuNWVtO2ZvbnQtZmFtaWx5OiAtYXBwbGUtc3lzdGVtLEJsaW5rTWFjU3lzdGVtRm9udCxzYW5zLXNlcmlmO3dvcmQtd3JhcDogYnJlYWstd29yZDt9PC9zdHlsZT4g";function dismiss(){if(document.getElementById("never").checked)window.localStorage.setItem("toasted",true);document.body.classList.remove("toasting")}var validTypes=["image/svg+xml"];window.onhashchange=window.onload=function(){var hash=window.location.hash.substring(1);if(hash.length<3){location.href="/edit"}else{var iframe=document.getElementById("iframe");var link=document.getElementById("edit");var preamble=undefined;var download=undefined;var slashIndex=hash.indexOf("/");var title=hash.substring(0,slashIndex);document.title=title.length?decodeURIComponent(title.replace(/_/g," ")):location.hostname;hash=hash.substring(slashIndex+1);var editable=hash.charAt(0)=="?";if(editable){hash=hash.substring(1)}if(hash.indexOf("data:")!=0){var colon=hash.indexOf(":");if(colon>0&&colon<15){document.body.classList.remove("toasting");return window.location.replace(hash)}var compressed=true;preamble=HEAD_TAGS_EXTENDED;hash="data:text/html;charset=utf-8;"+(compressed?"bxze64,":"base64,")+hash}else if(hash.indexOf("data:text/html;")==0){preamble=HEAD_TAGS}else if(hash.indexOf("data:text/plain;")==0){preamble=HEAD_TAGS_EXTENDED}else{let match=hash.match(/data:([^;]+)/);let type=match[1];console.log("match",match,type);if(!validTypes.includes(type)){console.log("unknown type, rendering as download");let extension=title.split(".");document.querySelector("#dl-name").innerText=title;if(extension.length>1)document.querySelector("#dl-image").innerText=extension.pop();download=document.querySelector("#download");download.download=title}}link.onclick=function(){location.href="/edit"+location.hash};var isIE=navigator.userAgent.match(/rv:11/);var isEdge=navigator.userAgent.match(/Edge\//);if((isEdge||isIE)&&location.href.length==2083){document.getElementById("warning").innerHTML='Edge only supports shorter URLs (maximum 2083 bytes).<br>Larger sites may require a different browser.<br><a href="http://reference.bitty.site">Learn more</a>'}decompressDataURI(hash,preamble,(function(dataURL){if(!dataURL)return;iframe.sandbox="allow-downloads allow-scripts allow-forms allow-top-navigation allow-popups allow-modals allow-popups-to-escape-sandbox";if(download){try{download.href=dataURL;download.click();document.body.classList.add("download")}catch(e){iframe.src=dataURL}}else if(!isIE){iframe.src=dataURL}else{dataToString(dataURL,(function(content){var doc=iframe.contentWindow.document;doc.open();doc.write(content);doc.close()}))}}));var link=document.getElementById("edit");link.href="/edit"+location.hash;link.style.display=editable?"block":"none"}};
diff --git a/docs/index.src/index.css b/docs/index.src/index.css
index 5e6f4bc..6ff7702 100644
--- a/docs/index.src/index.css
+++ b/docs/index.src/index.css
@@ -60,3 +60,52 @@ body:not(.toasting) #toast,
 body.toasting #warning {
   display: none;
 }
+
+body:not(.download) #download {
+  display:none;
+}
+
+#download {
+  background:#fafafa;
+  width:100vw;
+  height:100vh;
+  position:absolute;
+  top:0;
+  left:0;
+  display:flex;
+  text-decoration: none;
+  color:black;
+  justify-content: center;
+  align-items: center;
+  flex-direction: column;
+  font-size:14px;
+
+}
+#dl-image {
+  width:128px;
+  height:128px;
+  background-position: center;
+  background-repeat: no-repeat;
+  background-image: url("data:image/svg+xml,%0A%3Csvg width='128' height='128' viewBox='0 0 128 128' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cmask id='path-1-outside-1_116_2' maskUnits='userSpaceOnUse' x='27' y='15' width='74' height='98' fill='black'%3E%3Crect fill='white' x='27' y='15' width='74' height='98'/%3E%3Cpath d='M80 16H28V112H100V36L80 16Z'/%3E%3C/mask%3E%3Cpath d='M80 16H28V112H100V36L80 16Z' fill='white'/%3E%3Cpath d='M28 16V15H27V16H28ZM80 16L80.7071 15.2929L80.4142 15H80V16ZM28 112H27V113H28V112ZM100 112V113H101V112H100ZM100 36H101V35.5858L100.707 35.2929L100 36ZM28 17H80V15H28V17ZM29 112V16H27V112H29ZM100 111H28V113H100V111ZM99 36V112H101V36H99ZM100.707 35.2929L80.7071 15.2929L79.2929 16.7071L99.2929 36.7071L100.707 35.2929Z' fill='black' fill-opacity='0.15' mask='url(%23path-1-outside-1_116_2)'/%3E%3C/svg%3E%0A");
+  padding: 20px 32px;
+  box-sizing: border-box;
+  display:flex;
+  justify-content: center;
+  align-items: center;;
+  color:rgba(0,0,0,0.3);
+  font-weight:bold;
+}
+#dl-button {
+  text-decoration:none;
+  background:gray;
+  color:white;
+  padding:0.5em 1em;
+  border-radius:2em;
+  display:none;
+}
+#dl-button:hover {
+  background:black;
+}
+#dl-name {
+margin-bottom:2em;
+}
diff --git a/docs/index.src/index.html b/docs/index.src/index.html
index 001b43d..97f1908 100644
--- a/docs/index.src/index.html
+++ b/docs/index.src/index.html
@@ -16,4 +16,5 @@ you would show any insecure web page.
 <iframe id="iframe"></iframe>
 <div id="warning"></div>
 <a id="edit">edit</a>
+<a id="download"><div id="dl-image"></div><div id="dl-name"></div><div id="dl-button">Download</div></a>
 </html>
\ No newline at end of file
diff --git a/docs/index.src/index.js b/docs/index.src/index.js
index f0921e5..48fbee7 100644
--- a/docs/index.src/index.js
+++ b/docs/index.src/index.js
@@ -7,6 +7,8 @@ function dismiss() {
   document.body.classList.remove("toasting")
 }
 
+var validTypes = ["image/svg+xml"]
+
 window.onhashchange = window.onload = function() {
   var hash = window.location.hash.substring(1);
   if (hash.length < 3) {
@@ -17,6 +19,7 @@ window.onhashchange = window.onload = function() {
     var iframe = document.getElementById("iframe");
     var link = document.getElementById("edit");
     var preamble = undefined;
+    var download = undefined;
 
     var slashIndex = hash.indexOf("/");
     var title = hash.substring(0, slashIndex);
@@ -45,6 +48,19 @@ window.onhashchange = window.onload = function() {
       preamble = HEAD_TAGS;
     } else if (hash.indexOf("data:text/plain;") == 0) {
       preamble = HEAD_TAGS_EXTENDED;
+    } else {
+      let match = hash.match(/data:([^;]+)/)
+      let type = match[1];
+      console.log("match", match, type)
+
+      if (!validTypes.includes(type)) {
+        console.log("unknown type, rendering as download")
+        let extension = title.split(".")
+        document.querySelector("#dl-name").innerText = title;
+        if (extension.length > 1) document.querySelector("#dl-image").innerText = extension.pop();
+        download = document.querySelector("#download");
+        download.download = title;  
+      }
     }
     link.onclick = function() {
       location.href = "/edit" + location.hash;
@@ -56,14 +72,22 @@ window.onhashchange = window.onload = function() {
       document.getElementById("warning").innerHTML =
         'Edge only supports shorter URLs (maximum 2083 bytes).<br>Larger sites may require a different browser.<br><a href="http://reference.bitty.site">Learn more</a>';
     }
-    decompressDataURI(hash, preamble, function(hash) {
-      if (!hash) return;
-      iframe.sandbox =
-        "allow-downloads allow-scripts allow-forms allow-top-navigation allow-popups allow-modals allow-popups-to-escape-sandbox";
-      if (!isIE) {
-        if (hash) iframe.src = hash;
+    decompressDataURI(hash, preamble, function(dataURL) {
+      if (!dataURL) return;
+      iframe.sandbox = "allow-downloads allow-scripts allow-forms allow-top-navigation allow-popups allow-modals allow-popups-to-escape-sandbox";
+      
+      if (download) {
+        try {
+          download.href = dataURL
+          download.click();
+          document.body.classList.add("download");  
+        } catch (e) {
+          iframe.src = dataURL;
+        }
+      } else if (!isIE) {
+        iframe.src = dataURL;
       } else {
-        dataToString(hash, function(content) {
+        dataToString(dataURL, function(content) {
           var doc = iframe.contentWindow.document;
           doc.open();
           doc.write(content);
diff --git a/firebase.json b/firebase.json
index 4a78365..b4e14b4 100644
--- a/firebase.json
+++ b/firebase.json
@@ -1,6 +1,6 @@
 {
   "hosting": {
-    "public": "public",
+    "public": "docs",
     "ignore": [
       "firebase.json",
       "**/.*",