diff --git a/README.md b/README.md
index 0ba5eeb1..904a4789 100644
--- a/README.md
+++ b/README.md
@@ -325,6 +325,7 @@ You don't have to do anything manually!
 1. Google Cloud DNS API
 1. ConoHa (https://www.conoha.jp)
 1. netcup DNS API (https://www.netcup.de)
+1. GratisDNS.dk (https://gratisdns.dk)
 
 And: 
 
diff --git a/dnsapi/README.md b/dnsapi/README.md
index 47862d6c..891417f3 100644
--- a/dnsapi/README.md
+++ b/dnsapi/README.md
@@ -970,6 +970,26 @@ acme.sh --issue --dns dns_netcup -d example.com -d www.example.com
 
 The `NC_Apikey`,`NC_Apipw` and `NC_CID` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
 
+## 52. Use GratisDNS.dk
+
+GratisDNS.dk (https://gratisdns.dj/) does not provide an API to update DNS records (other than IPv4 and IPv6
+dynamic DNS addresses).  The acme.sh plugin therefore retrieves and updates domain TXT records by logging
+into the GratisDNS website to read the HTML and posting updates as HTTP.  The plugin needs to know your
+userid and password for the GratisDNS website.
+
+```sh
+export GDNSDK_Username="..."
+export GDNSDK_Password="..."
+```
+The username and password will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
+
+
+Now you can issue a certificate.
+
+```sh
+acme.sh --issue --dns dns_gdnsdk -d example.com -d *.example.com
+```
+
 # Use custom API
 
 If your API is not supported yet, you can write your own DNS API.
diff --git a/dnsapi/dns_gdnsdk.sh b/dnsapi/dns_gdnsdk.sh
new file mode 100755
index 00000000..05a4c9fc
--- /dev/null
+++ b/dnsapi/dns_gdnsdk.sh
@@ -0,0 +1,168 @@
+#!/usr/bin/env sh
+#Author: Herman Sletteng
+#Report Bugs here: https://github.com/loial/acme.sh
+#
+#
+# Note, gratisdns requires a login first, so the script needs to handle
+# temporary cookies. Since acme.sh _get/_post currently don't directly support
+# cookies, I've defined wrapper functions _myget/_mypost to set the headers
+
+GDNSDK_API="https://admin.gratisdns.com"
+########  Public functions #####################
+#Usage: dns_gdnsdk_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_gdnsdk_add() {
+  fulldomain=$1
+  txtvalue=$2
+  _info "Using gratisdns.dk"
+  _debug fulldomain "$fulldomain"
+  _debug txtvalue "$txtvalue"
+  if ! _gratisdns_login; then
+    _err "Login failed!"
+    return 1
+  fi
+  #finding domain zone
+  if ! _get_domain; then
+    _err "No matching root domain for $fulldomain found"
+    return 1
+  fi
+  # adding entry
+  _info "Adding the entry"
+  _mypost "action=dns_primary_record_added_txt&user_domain=$_domain&name=$fulldomain&txtdata=$txtvalue&ttl=1"
+  if _successful_update; then return 0; fi
+  _err "Couldn't create entry!"
+  return 1
+}
+
+#Usage: fulldomain txtvalue
+#Remove the txt record after validation.
+dns_gdnsdk_rm() {
+  fulldomain=$1
+  txtvalue=$2
+  _info "Using gratisdns.dk"
+  _debug fulldomain "$fulldomain"
+  _debug txtvalue "$txtvalue"
+  if ! _gratisdns_login; then
+    _err "Login failed!"
+    return 1
+  fi
+  if ! _get_domain; then
+    _err "No matching root domain for $fulldomain found"
+    return 1
+  fi
+  _findentry "$fulldomain" "$txtvalue"
+  if [ -z "$_id" ]; then
+    _info "Entry doesn't exist, nothing to delete"
+    return 0
+  fi
+  _debug "Deleting record..."
+  _mypost "action=dns_primary_delete_txt&user_domain=$_domain&id=$_id"
+  # removing entry
+
+  if _successful_update; then return 0; fi
+  _err "Couldn't delete entry!"
+  return 1
+}
+
+####################  Private functions below ##################################
+
+_checkcredentials() {
+  GDNSDK_Username="${GDNSDK_Username:-$(_readaccountconf_mutable GDNSDK_Username)}"
+  GDNSDK_Password="${GDNSDK_Password:-$(_readaccountconf_mutable GDNSDK_Password)}"
+
+  if [ -z "$GDNSDK_Username" ] || [ -z "$GDNSDK_Password" ]; then
+    GDNSDK_Username=""
+    GDNSDK_Password=""
+    _err "You haven't specified gratisdns.dk username and password yet."
+    _err "Please add credentials and try again."
+    return 1
+  fi
+  #save the credentials to the account conf file.
+  _saveaccountconf_mutable GDNSDK_Username "$GDNSDK_Username"
+  _saveaccountconf_mutable GDNSDK_Password "$GDNSDK_Password"
+  return 0
+}
+
+_checkcookie() {
+  GDNSDK_Cookie="${GDNSDK_Cookie:-$(_readaccountconf_mutable GDNSDK_Cookie)}"
+  if [ -z "$GDNSDK_Cookie" ]; then
+    _debug "No cached cookie found"
+    return 1
+  fi
+  _myget "action="
+  if (echo "$_result" | grep -q "logmeout"); then
+    _debug "Cached cookie still valid"
+    return 0
+  fi
+  _debug "Cached cookie no longer valid"
+  GDNSDK_Cookie=""
+  _saveaccountconf_mutable GDNSDK_Cookie "$GDNSDK_Cookie"
+  return 1
+}
+
+_gratisdns_login() {
+  if ! _checkcredentials; then return 1; fi
+
+  if _checkcookie; then
+    _debug "Already logged in"
+    return 0
+  fi
+  _debug "Logging into GratisDNS with user $GDNSDK_Username"
+
+  if ! _mypost "login=$GDNSDK_Username&password=$GDNSDK_Password&action=logmein"; then
+    _err "GratisDNS login failed for user $GDNSDK_Username bad RC from _post"
+    return 1
+  fi
+
+  GDNSDK_Cookie="$(grep -A 15 '302 Found' "$HTTP_HEADER" | _egrep_o 'Cookie: [^;]*' | _head_n 1 | cut -d ' ' -f2)"
+
+  if [ -z "$GDNSDK_Cookie" ]; then
+    _err "GratisDNS login failed for user $GDNSDK_Username. Check $HTTP_HEADER file"
+    return 1
+  fi
+  export GDNSDK_Cookie
+  _saveaccountconf_mutable GDNSDK_Cookie "$GDNSDK_Cookie"
+  return 0
+}
+
+_myget() {
+  #Adds cookie to request
+  export _H1="Cookie: $GDNSDK_Cookie"
+  _result=$(_get "$GDNSDK_API?$1")
+}
+_mypost() {
+  #Adds cookie to request
+  export _H1="Cookie: $GDNSDK_Cookie"
+  _result=$(_post "$1" "$GDNSDK_API")
+}
+
+_get_domain() {
+  _myget 'action=dns_primarydns'
+  _domains=$(echo "$_result" | grep -o -P ' domain="\K([[:alnum:].-_]+)')
+  if [ -z "$_domains" ]; then
+    _err "Primary domain list not found!"
+    return 1
+  fi
+  for _domain in $_domains; do
+    if (_endswith "$fulldomain" "$_domain"); then
+      _debug "Root domain: $_domain"
+      return 0
+    fi
+  done
+  return 1
+}
+
+_successful_update() {
+  if (echo "$_result" | grep -q 'table-success'); then return 0; fi
+  return 1
+}
+
+_findentry() {
+  #returns id of dns entry, if it exists
+  _myget "action=dns_primary_changeDNSsetup&user_domain=$_domain"
+  _id=$(echo "$_result" | grep -o -P "$1</td>\s*<td>$2.*?id=\K(\d*)")
+  if [ -n "$_id" ]; then
+    _debug "Entry found with _id=$_id"
+    return 0
+  fi
+  return 1
+}