diff --git a/content/multipledataset.html b/content/multipledataset.html
index 74fd63dd..564116de 100644
--- a/content/multipledataset.html
+++ b/content/multipledataset.html
@@ -34,11 +34,34 @@ draft: false
           break;
       }
       window.dats=await Promise.all(proms)
-      reloadSelect()
-      await reloadContent()
+      reloadFileSelector()
+      await reloadSelect()
     })
   }
-  function reloadSelect(){
+  function reloadFileSelector(){
+    document.getElementById("customFiles_input").value = ""
+  }
+
+  async function reloadSelect(){
+    radioval=$('#form_dat > input[name=datatype]:checked').val();
+    for(file of Array.from(document.getElementById("customFiles_input").files))
+    {
+      switch (radioval) {
+        case "abs":
+          var dat=await AbsDataFile.loadAsync(file)
+          window.dats.push(dat)
+          break;
+      
+        case "fluo":
+          dat=await FluoDataFile.loadAsync(file)
+          window.dats.push(dat)
+          break;
+        case "ZPE":
+          dat=await ZPEDataFile.loadAsync(file)
+          window.dats.push(dat)
+          break;
+      }
+    }
     $('#form_dat > select').each(function(){
       $(this).find('option[value!=""]').remove()
       const vals=uniq(window.dats.map((d)=>{return d[$(this).attr("name")]}))
@@ -49,6 +72,7 @@ draft: false
         $(this).append(op)
     }
     })
+    await reloadContent()
   }
   async function reloadStat(){
     var stb=document.getElementById("stat_table_b");
@@ -162,7 +186,7 @@ draft: false
       var lnkfile=document.createElement("a")
       lnkfile.target="_blank"
       lnkfile.innerText="Go to file"
-      lnkfile.href=d.sourceFile.viewerUrl
+      lnkfile.href=await d.sourceFile.getViewerURL()
       row.appendChild(lnkfile)
       dtb.appendChild(row)
     }
@@ -179,6 +203,9 @@ draft: false
     <input type="radio" id="zpe" value="zpe" name="datatype">
     <label for="zpe">\(\Delta \text{ZPE}\)</label>
     <br/>
+    <label for="customFiles">Add custom data file</label>
+    <input type="file" multiple onchange="reloadSelect()" id="customFiles_input"></input>
+    <br/>
     <label for="mol_select">Molecule</label>
     <select multiple id="mol_select" onchange="reloadContent()" name="molecule"></select>
     <label for="code_select">Code</label>
diff --git a/content/onedataset.html b/content/onedataset.html
index c00ce2da..7b473ecf 100644
--- a/content/onedataset.html
+++ b/content/onedataset.html
@@ -114,7 +114,7 @@ draft: false
               node=document.createElement("a")
               node.innerText="Go to file"
               node.target='_blank'
-              node.href=element.viewerUrl
+              node.href= await element.getViewerURL()
               break
             case "Array":
               k=element[0]
diff --git a/content/view.html b/content/view.html
index 6b8aea64..a7da6002 100644
--- a/content/view.html
+++ b/content/view.html
@@ -24,21 +24,30 @@ draft: false
         console.warn(mystr);
       }
       queryDic=parseQueryStringToDictionary()
-      key="dataFile"
-      if(queryDic[key]!=undefined){       
-        var filename=queryDic[key];
-        var path=getFullDataPath(filename);
-        var textPromise=getTextFromFileAsync(path) 
+      key=["file","fileBase64"]
+      if(key[0] in queryDic){
+        var filename=queryDic[key[0]];
+        var textPromise=getTextFromFileUrlAsync(filename) 
         btn_download=document.getElementById("btn_download");
         btn_download.onclick=function(){
-          window.open(path,"_self");
+          window.open(filename,"_self");
         }
         document.getElementById('fileTitle').innerText=filename;
         document.getElementById('fileContent').innerText=await textPromise;
         document.getElementById('file').hidden=false;
         document.getElementById("div_btn").hidden=false;
+      } else if(key[1] in queryDic){
+        var base64=queryDic[key[1]];
+        btn_download=document.getElementById("btn_download");
+        btn_download.onclick=function(){
+          window.open(String.raw`data:application/pdf;base64,${Base64}`,"_self")
+        }
+        document.getElementById('fileTitle').hudden=true
+        document.getElementById('fileContent').innerText=atob(base64)
+        document.getElementById('file').hidden=false;
+        document.getElementById("div_btn").hidden=false;
       }
-      else {
+      else{
         document.getElementById('error_P').hidden=false;
         errNode;
       }
diff --git a/static/scripts/data.js b/static/scripts/data.js
index c45e486b..d6027c45 100644
--- a/static/scripts/data.js
+++ b/static/scripts/data.js
@@ -111,7 +111,16 @@ class dataFileBase {
     this.sourceFile=null
   }
   static async loadAsync(file) {
-    var dat = this.loadString(await getTextFromFileAsync(getFullDataPath(file)));
+    switch (trueTypeOf(file)) {
+      case "string":
+        file=getFullDataPath(file)
+        var str=await getTextFromFileUrlAsync(file)
+        break;
+      case "File":
+        var str=await getTextFromUploadedFileAsync(file)
+        break
+    }
+    var dat = this.loadString(str);
     dat.sourceFile=new websiteFile(file)
     return dat
   }
diff --git a/static/scripts/getTextFromFile.js b/static/scripts/getTextFromFile.js
index acc499ad..12ab05bb 100644
--- a/static/scripts/getTextFromFile.js
+++ b/static/scripts/getTextFromFile.js
@@ -1,7 +1,7 @@
-async function getTextFromFileAsync(file) {
+async function getTextFromFileUrlAsync(url) {
   return new Promise(function (resolve, reject) {
   var req = new XMLHttpRequest();
-  req.open("GET",file, true);
+  req.open("GET",url, true);
   req.onreadystatechange = function() {
     if (req.readyState == 4) {
       if (req.status == 200) {//when a good response is given do this
@@ -17,4 +17,20 @@ async function getTextFromFileAsync(file) {
   }
   req.send();
   });
-}
\ No newline at end of file
+}
+
+async function getTextFromUploadedFileAsync(inputFile){
+  const temporaryFileReader = new FileReader();
+
+  return new Promise((resolve, reject) => {
+    temporaryFileReader.onerror = () => {
+      temporaryFileReader.abort();
+      reject(new DOMException("Problem parsing input file."));
+    };
+
+    temporaryFileReader.onload = () => {
+      resolve(temporaryFileReader.result);
+    };
+    temporaryFileReader.readAsText(inputFile);
+  });
+};
\ No newline at end of file
diff --git a/static/scripts/websiteFile.js b/static/scripts/websiteFile.js
index 5098180c..1822327a 100644
--- a/static/scripts/websiteFile.js
+++ b/static/scripts/websiteFile.js
@@ -1,8 +1,18 @@
 class websiteFile{
-  constructor(path){
-    this.path=path
+  constructor(file){
+    this.file=file
   }
-  get viewerUrl(){
-    return String.raw`/view?dataFile=${this.path}`
+
+  async getViewerURL(){
+    var urlbase="/view"
+    switch (trueTypeOf(this.file)) {
+      case "string":
+        return String.raw`${urlbase}?file=${this.file}`
+        break
+      case "File":
+        var base64=btoa(await getTextFromUploadedFileAsync(this.file))
+        return String.raw`${urlbase}?fileBase64=${base64}`;
+        break
+    }
   }
 }
\ No newline at end of file