diff --git a/FormData.js b/FormData.js
index c3111fe..4beefcb 100644
--- a/FormData.js
+++ b/FormData.js
@@ -103,6 +103,15 @@ if (typeof FormData === 'undefined' || !FormData.prototype.keys) {
       : [name + '', value + '']
   }
 
+  // normalize linefeeds for textareas
+  // https://html.spec.whatwg.org/multipage/form-elements.html#textarea-line-break-normalisation-transformation
+  function normalizeLinefeeds(value) {
+    if (typeof value === "string") {
+      value = value.replace(/\r\n/g, "\n").replace(/\n/g, "\r\n")
+    }
+    return value
+  }
+
   function each (arr, cb) {
     for (let i = 0; i < arr.length; i++) {
       cb(arr[i])
@@ -141,7 +150,8 @@ if (typeof FormData === 'undefined' || !FormData.prototype.keys) {
         } else if (elm.type === 'checkbox' || elm.type === 'radio') {
           if (elm.checked) self.append(elm.name, elm.value)
         } else {
-          self.append(elm.name, elm.value)
+          const value = elm.type === 'textarea' ? normalizeLinefeeds(elm.value) : elm.value
+          self.append(elm.name, value)
         }
       })
     }
diff --git a/formdata.min.js b/formdata.min.js
index ac012fa..81c8e07 100644
--- a/formdata.min.js
+++ b/formdata.min.js
@@ -5,13 +5,13 @@ D.prototype.i=function(a){this.f={u:a,v:!0};this.b=this.s||this.l};D.prototype["
 function K(a,b){E(a.a);var d=a.a.c;if(d)return I(a,"return"in d?d["return"]:function(a){return{value:a,done:!0}},b,a.a["return"]);a.a["return"](b);return J(a)}H.prototype.i=function(a){E(this.a);if(this.a.c)return I(this,this.a.c["throw"],a,this.a.h);this.a.i(a);return J(this)};
 function I(a,b,d,c){try{var e=b.call(a.a.c,d);if(!(e instanceof Object))throw new TypeError("Iterator result "+e+" is not an object");if(!e.done)return a.a.g=!1,e;var f=e.value}catch(g){return a.a.c=null,a.a.i(g),J(a)}a.a.c=null;c.call(a.a,f);return J(a)}function J(a){for(;a.a.b;)try{var b=a.A(a.a);if(b)return a.a.g=!1,{value:b.value,done:!1}}catch(d){a.a.m=void 0,a.a.i(d)}a.a.g=!1;if(a.a.f){b=a.a.f;a.a.f=null;if(b.v)throw b.u;return{value:b["return"],done:!0}}return{value:void 0,done:!0}}
 function L(a){this.next=function(b){return a.h(b)};this["throw"]=function(b){return a.i(b)};this["return"]=function(b){return K(a,b)};u();this[Symbol.iterator]=function(){return this}}function M(a,b){var d=new L(new H(b));C&&C(d,a.prototype);return d}
-if("undefined"===typeof FormData||!FormData.prototype.keys){var N=function(a,b){for(var d=0;d<a.length;d++)b(a[d])},O=function(a,b,d){if(2>arguments.length)throw new TypeError("2 arguments required, but only "+arguments.length+" present.");return b instanceof Blob?[a+"",b,void 0!==d?d+"":"string"===typeof b.name?b.name:"blob"]:[a+"",b+""]},P=function(a){if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");return[a+""]},Q=function(a){var b=x(a);a=b.next().value;b=b.next().value;
-a instanceof Blob&&(a=new File([a],b,{type:a.type,lastModified:a.lastModified}));return a},R="object"===typeof window?window:"object"===typeof self?self:this,S=R.FormData,T=R.XMLHttpRequest&&R.XMLHttpRequest.prototype.send,U=R.Request&&R.fetch;p();var V=R.Symbol&&Symbol.toStringTag,W=new WeakMap,X=Array.from||function(a){return[].slice.call(a)};V&&(Blob.prototype[V]||(Blob.prototype[V]="Blob"),"File"in R&&!File.prototype[V]&&(File.prototype[V]="File"));try{new File([],"")}catch(a){R.File=function(b,
-d,c){b=new Blob(b,c);c=c&&void 0!==c.lastModified?new Date(c.lastModified):new Date;Object.defineProperties(b,{name:{value:d},lastModifiedDate:{value:c},lastModified:{value:+c},toString:{value:function(){return"[object File]"}}});V&&Object.defineProperty(b,V,{value:"File"});return b}}p();u();var Y=function(a){W.set(this,Object.create(null));if(!a)return this;var b=this;N(a.elements,function(a){a.name&&!a.disabled&&"submit"!==a.type&&"button"!==a.type&&("file"===a.type?N(a.files||[],function(c){b.append(a.name,
-c)}):"select-multiple"===a.type||"select-one"===a.type?N(a.options,function(c){!c.disabled&&c.selected&&b.append(a.name,c.value)}):"checkbox"===a.type||"radio"===a.type?a.checked&&b.append(a.name,a.value):b.append(a.name,a.value))})};k=Y.prototype;k.append=function(a,b,d){var c=W.get(this);c[a]||(c[a]=[]);c[a].push([b,d])};k["delete"]=function(a){delete W.get(this)[a]};k.entries=function b(){var d=this,c,e,f,g,h,q;return M(b,function(b){switch(b.b){case 1:c=W.get(d),f=new G(c);case 2:var t;a:{for(t=
-f;0<t.j.length;){var w=t.j.pop();if(w in t.w){t=w;break a}}t=null}if(null==(e=t)){b.b=0;break}g=x(c[e]);h=g.next();case 5:if(h.done){b.b=2;break}q=h.value;return F(b,[e,Q(q)],6);case 6:h=g.next(),b.b=5}})};k.forEach=function(b,d){for(var c=x(this),e=c.next();!e.done;e=c.next()){var f=x(e.value);e=f.next().value;f=f.next().value;b.call(d,f,e,this)}};k.get=function(b){var d=W.get(this);return d[b]?Q(d[b][0]):null};k.getAll=function(b){return(W.get(this)[b]||[]).map(Q)};k.has=function(b){return b in
-W.get(this)};k.keys=function d(){var c=this,e,f,g,h,q;return M(d,function(d){1==d.b&&(e=x(c),f=e.next());if(3!=d.b){if(f.done){d.b=0;return}g=f.value;h=x(g);q=h.next().value;return F(d,q,3)}f=e.next();d.b=2})};k.set=function(d,c,e){W.get(this)[d]=[[c,e]]};k.values=function c(){var e=this,f,g,h,q,w;return M(c,function(c){1==c.b&&(f=x(e),g=f.next());if(3!=c.b){if(g.done){c.b=0;return}h=g.value;q=x(h);q.next();w=q.next().value;return F(c,w,3)}g=f.next();c.b=2})};Y.prototype._asNative=function(){for(var c=
-new S,e=x(this),f=e.next();!f.done;f=e.next()){var g=x(f.value);f=g.next().value;g=g.next().value;c.append(f,g)}return c};Y.prototype._blob=function(){for(var c="----formdata-polyfill-"+Math.random(),e=[],f=x(this),g=f.next();!g.done;g=f.next()){var h=x(g.value);g=h.next().value;h=h.next().value;e.push("--"+c+"\r\n");h instanceof Blob?e.push('Content-Disposition: form-data; name="'+g+'"; filename="'+h.name+'"\r\n',"Content-Type: "+(h.type||"application/octet-stream")+"\r\n\r\n",h,"\r\n"):e.push('Content-Disposition: form-data; name="'+
-g+'"\r\n\r\n'+h+"\r\n")}e.push("--"+c+"--");return new Blob(e,{type:"multipart/form-data; boundary="+c})};Y.prototype[Symbol.iterator]=function(){return this.entries()};Y.prototype.toString=function(){return"[object FormData]"};V&&(Y.prototype[V]="FormData");[["append",O],["delete",P],["get",P],["getAll",P],["has",P],["set",O]].forEach(function(c){var e=Y.prototype[c[0]];Y.prototype[c[0]]=function(){return e.apply(this,c[1].apply(this,X(arguments)))}});T&&(XMLHttpRequest.prototype.send=function(c){c instanceof
-Y?(c=c._blob(),this.setRequestHeader("Content-Type",c.type),T.call(this,c)):T.call(this,c)});if(U){var Z=R.fetch;R.fetch=function(c,e){e&&e.body&&e.body instanceof Y&&(e.body=e.body._blob());return Z(c,e)}}R.FormData=Y};
+if("undefined"===typeof FormData||!FormData.prototype.keys){var N=function(a,b){for(var d=0;d<a.length;d++)b(a[d])},O=function(a){"string"===typeof a&&(a=a.replace(/\r\n/g,"\n").replace(/\n/g,"\r\n"));return a},P=function(a,b,d){if(2>arguments.length)throw new TypeError("2 arguments required, but only "+arguments.length+" present.");return b instanceof Blob?[a+"",b,void 0!==d?d+"":"string"===typeof b.name?b.name:"blob"]:[a+"",b+""]},Q=function(a){if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");
+return[a+""]},R=function(a){var b=x(a);a=b.next().value;b=b.next().value;a instanceof Blob&&(a=new File([a],b,{type:a.type,lastModified:a.lastModified}));return a},S="object"===typeof window?window:"object"===typeof self?self:this,T=S.FormData,U=S.XMLHttpRequest&&S.XMLHttpRequest.prototype.send,V=S.Request&&S.fetch;p();var W=S.Symbol&&Symbol.toStringTag,X=new WeakMap,Y=Array.from||function(a){return[].slice.call(a)};W&&(Blob.prototype[W]||(Blob.prototype[W]="Blob"),"File"in S&&!File.prototype[W]&&
+(File.prototype[W]="File"));try{new File([],"")}catch(a){S.File=function(b,d,c){b=new Blob(b,c);c=c&&void 0!==c.lastModified?new Date(c.lastModified):new Date;Object.defineProperties(b,{name:{value:d},lastModifiedDate:{value:c},lastModified:{value:+c},toString:{value:function(){return"[object File]"}}});W&&Object.defineProperty(b,W,{value:"File"});return b}}p();u();var Z=function(a){X.set(this,Object.create(null));if(!a)return this;var b=this;N(a.elements,function(a){if(a.name&&!a.disabled&&"submit"!==
+a.type&&"button"!==a.type)if("file"===a.type)N(a.files||[],function(c){b.append(a.name,c)});else if("select-multiple"===a.type||"select-one"===a.type)N(a.options,function(c){!c.disabled&&c.selected&&b.append(a.name,c.value)});else if("checkbox"===a.type||"radio"===a.type)a.checked&&b.append(a.name,a.value);else{var c="textarea"===a.type?O(a.value):a.value;b.append(a.name,c)}})};k=Z.prototype;k.append=function(a,b,d){var c=X.get(this);c[a]||(c[a]=[]);c[a].push([b,d])};k["delete"]=function(a){delete X.get(this)[a]};
+k.entries=function b(){var d=this,c,e,f,g,h,q;return M(b,function(b){switch(b.b){case 1:c=X.get(d),f=new G(c);case 2:var t;a:{for(t=f;0<t.j.length;){var w=t.j.pop();if(w in t.w){t=w;break a}}t=null}if(null==(e=t)){b.b=0;break}g=x(c[e]);h=g.next();case 5:if(h.done){b.b=2;break}q=h.value;return F(b,[e,R(q)],6);case 6:h=g.next(),b.b=5}})};k.forEach=function(b,d){for(var c=x(this),e=c.next();!e.done;e=c.next()){var f=x(e.value);e=f.next().value;f=f.next().value;b.call(d,f,e,this)}};k.get=function(b){var d=
+X.get(this);return d[b]?R(d[b][0]):null};k.getAll=function(b){return(X.get(this)[b]||[]).map(R)};k.has=function(b){return b in X.get(this)};k.keys=function d(){var c=this,e,f,g,h,q;return M(d,function(d){1==d.b&&(e=x(c),f=e.next());if(3!=d.b){if(f.done){d.b=0;return}g=f.value;h=x(g);q=h.next().value;return F(d,q,3)}f=e.next();d.b=2})};k.set=function(d,c,e){X.get(this)[d]=[[c,e]]};k.values=function c(){var e=this,f,g,h,q,w;return M(c,function(c){1==c.b&&(f=x(e),g=f.next());if(3!=c.b){if(g.done){c.b=
+0;return}h=g.value;q=x(h);q.next();w=q.next().value;return F(c,w,3)}g=f.next();c.b=2})};Z.prototype._asNative=function(){for(var c=new T,e=x(this),f=e.next();!f.done;f=e.next()){var g=x(f.value);f=g.next().value;g=g.next().value;c.append(f,g)}return c};Z.prototype._blob=function(){for(var c="----formdata-polyfill-"+Math.random(),e=[],f=x(this),g=f.next();!g.done;g=f.next()){var h=x(g.value);g=h.next().value;h=h.next().value;e.push("--"+c+"\r\n");h instanceof Blob?e.push('Content-Disposition: form-data; name="'+
+g+'"; filename="'+h.name+'"\r\n',"Content-Type: "+(h.type||"application/octet-stream")+"\r\n\r\n",h,"\r\n"):e.push('Content-Disposition: form-data; name="'+g+'"\r\n\r\n'+h+"\r\n")}e.push("--"+c+"--");return new Blob(e,{type:"multipart/form-data; boundary="+c})};Z.prototype[Symbol.iterator]=function(){return this.entries()};Z.prototype.toString=function(){return"[object FormData]"};W&&(Z.prototype[W]="FormData");[["append",P],["delete",Q],["get",Q],["getAll",Q],["has",Q],["set",P]].forEach(function(c){var e=
+Z.prototype[c[0]];Z.prototype[c[0]]=function(){return e.apply(this,c[1].apply(this,Y(arguments)))}});U&&(XMLHttpRequest.prototype.send=function(c){c instanceof Z?(c=c._blob(),this.setRequestHeader("Content-Type",c.type),U.call(this,c)):U.call(this,c)});if(V){var aa=S.fetch;S.fetch=function(c,e){e&&e.body&&e.body instanceof Z&&(e.body=e.body._blob());return aa(c,e)}}S.FormData=Z};
 })();
diff --git a/package-lock.json b/package-lock.json
index 53deb44..9a8cdc0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1010,12 +1010,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -1030,17 +1032,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -1157,7 +1162,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -1169,6 +1175,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -1183,6 +1190,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -1190,12 +1198,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -1214,6 +1224,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -1294,7 +1305,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -1306,6 +1318,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -1427,6 +1440,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
diff --git a/package.json b/package.json
index cc6c293..7f15df3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "formdata-polyfill",
-  "version": "3.0.13",
+  "version": "3.0.14",
   "description": "HTML5 `FormData` polyfill for Browsers.",
   "main": "formdata.min.js",
   "scripts": {
diff --git a/test/test.js b/test/test.js
index fe3d39b..5a71976 100644
--- a/test/test.js
+++ b/test/test.js
@@ -169,6 +169,56 @@ window.File = new Proxy(nativeFile, {
       })
     })
 
+    describe('linebreaks', () => {
+      // Native FormData normalizes linefeeds in textareas to CRLF
+      // In order to be consistent the polyfill should do the same
+      it('Should convert LF to CRLF for textareas', () => {
+        // This can not be tested with 'create_form' as the function ignores \n
+        const form = document.createElement('form')
+        const textarea = document.createElement('textarea')
+        textarea.name = 'key'
+        textarea.value = '\n'
+        form.appendChild(textarea)
+        const fd = new FormData(form)
+        const value = fd.get('key')
+        assert.equal('\r\n', value)
+      })
+
+      it('Should convert CR to CRLF for textareas', () => {
+        const form = document.createElement('form')
+        const textarea = document.createElement('textarea')
+        textarea.name = 'key'
+        textarea.value = '\r'
+        form.appendChild(textarea)
+        const fd = new FormData(form)
+        const value = fd.get('key')
+        assert.equal('\r\n', value)
+      })
+
+      it('Should normalize mixed linefeeds to CRLF for textareas', () => {
+        const form = document.createElement('form')
+        const textarea = document.createElement('textarea')
+        textarea.name = 'key'
+        textarea.value = 'a\n\ra\r\na\n\r\n\r\n\r\n\na\r\r'
+        form.appendChild(textarea)
+        const fd = new FormData(form)
+        const value = fd.get('key')
+        assert.equal('a\r\n\r\na\r\na\r\n\r\n\r\n\r\n\r\na\r\n\r\n', value)
+      })
+
+      it('Should not convert LF to CRLF when provided by append', () => {
+        const fd = create_formdata(['key', '\n'])
+        const value = fd.get('key')
+        assert.equal('\n', value)
+      })
+
+      it('Should not convert CR to CRLF when provided by append', () => {
+        const fd = create_formdata(['key', '\r'])
+        const value = fd.get('key')
+        assert.equal('\r', value)
+      })
+    })
+
     describe('disabled', () => {
       it('Shold not include disabled fields', () => {
         const fd = create_form(