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Current development going on here ➡️ Development Branch


ESP8266 WiFi Connection manager with fallback web configuration portal

Build Status

The configuration portal is of the captive variety, so on various devices it will present the configuration dialogue as soon as you connect to the created access point.

First attempt at a library. Lots more changes and fixes to do. Contributions are welcome.

This works with the ESP8266 Arduino platform with a recent stable release(2.0.0 or newer)


How It Works

  • when your ESP starts up, it sets it up in Station mode and tries to connect to a previously saved Access Point
  • if this is unsuccessful (or no previous network saved) it moves the ESP into Access Point mode and spins up a DNS and WebServer (default ip
  • using any wifi enabled device with a browser (computer, phone, tablet) connect to the newly created Access Point
  • because of the Captive Portal and the DNS server you will either get a 'Join to network' type of popup or get any domain you try to access redirected to the configuration portal
  • choose one of the access points scanned, enter password, click save
  • ESP will try to connect. If successful, it relinquishes control back to your app. If not, reconnect to AP and reconfigure.

How It Looks

ESP8266 WiFi Captive Portal Homepage ESP8266 WiFi Captive Portal Configuration


  • remove dependency on EEPROM library
  • move HTML Strings to PROGMEM
  • cleanup and streamline code (although this is ongoing)
  • if timeout is set, extend it when a page is fetched in AP mode
  • add ability to configure more parameters than ssid/password
  • maybe allow setting ip of ESP after reboot
  • add to Arduino Library Manager
  • add to PlatformIO
  • add multiple sets of network credentials
  • allow users to customize CSS
  • ESP32 support or instructions
  • rewrite documentation for simplicity, based on scenarios/goals
  • rely on the SDK's built in auto connect more than forcing a connect

Quick Start


You can either install through the Arduino Library Manager or checkout the latest changes or a release from github

Install through Library Manager

Currently version 0.8+ works with release 2.0.0 or newer of the ESP8266 core for Arduino

  • in Arduino IDE got to Sketch/Include Library/Manage Libraries Manage Libraries

  • search for WiFiManager WiFiManager package

  • click Install and start using it

Checkout from github

Github version works with release 2.0.0 or newer of the ESP8266 core for Arduino

  • Checkout library to your Arduino libraries folder


  • Include in your sketch
#include <ESP8266WiFi.h>          //ESP8266 Core WiFi Library (you most likely already have this in your sketch)

#include <DNSServer.h>            //Local DNS Server used for redirecting all requests to the configuration portal
#include <ESP8266WebServer.h>     //Local WebServer used to serve the configuration portal
#include <WiFiManager.h>          // WiFi Configuration Magic
  • Initialize library, in your setup function add
WiFiManager wifiManager;
  • Also in the setup function add
//first parameter is name of access point, second is the password
wifiManager.autoConnect("AP-NAME", "AP-PASSWORD");

if you just want an unsecured access point


or if you want to use and auto generated name from 'ESP' and the esp's Chip ID use


After you write your sketch and start the ESP, it will try to connect to WiFi. If it fails it starts in Access Point mode. While in AP mode, connect to it then open a browser to the gateway IP, default, configure wifi, save and it should reboot and connect.

Also see examples.


Password protect the configuration Access Point

You can and should password protect the configuration access point. Simply add the password as a second parameter to autoConnect. A short password seems to have unpredictable results so use one that's around 8 characters or more in length. The guidelines are that a wifi password must consist of 8 to 63 ASCII-encoded characters in the range of 32 to 126 (decimal)

wifiManager.autoConnect("AutoConnectAP", "password")


Enter Config mode

Use this if you need to do something when your device enters configuration mode on failed WiFi connection attempt. Before autoConnect()


configModeCallback declaration and example

void configModeCallback (WiFiManager *myWiFiManager) {
  Serial.println("Entered config mode");

Save settings

This gets called when custom parameters have been set AND a connection has been established. Use it to set a flag, so when all the configuration finishes, you can save the extra parameters somewhere.

See AutoConnectWithFSParameters Example.


saveConfigCallback declaration and example

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;

Configuration Portal Timeout

If you need to set a timeout so the ESP doesn't hang waiting to be configured, for instance after a power failure, you can add


which will wait 3 minutes (180 seconds). When the time passes, the autoConnect function will return, no matter the outcome. Check for connection and if it's still not established do whatever is needed (on some modules I restart them to retry, on others I enter deep sleep)

On Demand Configuration Portal

If you would rather start the configuration portal on demand rather than automatically on a failed connection attempt, then this is for you.

Instead of calling autoConnect() which does all the connecting and failover configuration portal setup for you, you need to use startConfigPortal(). Do not use BOTH.

Example usage

void loop() {
  // is configuration portal requested?
  if ( digitalRead(TRIGGER_PIN) == LOW ) {
    WiFiManager wifiManager;
    Serial.println("connected...yeey :)");

See example for a more complex version. OnDemandConfigPortal

Custom Parameters

You can use WiFiManager to collect more parameters than just SSID and password. This could be helpful for configuring stuff like MQTT host and port, blynk or emoncms tokens, just to name a few. You are responsible for saving and loading these custom values. The library just collects and displays the data for you as a convenience. Usage scenario would be:

  • load values from somewhere (EEPROM/FS) or generate some defaults
  • add the custom parameters to WiFiManager using
// id/name, placeholder/prompt, default, length
WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);

  • if connection to AP fails, configuration portal starts and you can set /change the values (or use on demand configuration portal)
  • once configuration is done and connection is established save config callback is called
  • once WiFiManager returns control to your application, read and save the new values using the WiFiManagerParameter object.
mqtt_server = custom_mqtt_server.getValue();

This feature is a lot more involved than all the others, so here are some examples to fully show how it is done. You should also take a look at adding custom HTML to your form.

  • Save and load custom parameters to file system in json form AutoConnectWithFSParameters
  • Save and load custom parameters to EEPROM (not done yet)

Custom IP Configuration

You can set a custom IP for both AP (access point, config mode) and STA (station mode, client mode, normal project state)

Custom Access Point IP Configuration

This will set your captive portal to a specific IP should you need/want such a feature. Add the following snippet before autoConnect()

//set custom ip for portal
wifiManager.setAPStaticIPConfig(IPAddress(10,0,1,1), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
Custom Station (client) Static IP Configuration

This will make use the specified IP configuration instead of using DHCP in station mode.

wifiManager.setSTAStaticIPConfig(IPAddress(192,168,0,99), IPAddress(192,168,0,1), IPAddress(255,255,255,0));

There are a couple of examples in the examples folder that show you how to set a static IP and even how to configure it through the web configuration portal.

Custom HTML, CSS, Javascript

There are various ways in which you can inject custom HTML, CSS or Javascript into the configuration portal. The options are:

  • inject custom head element You can use this to any html bit to the head of the configuration portal. If you add a <style> element, bare in mind it overwrites the included css, not replaces.
wifiManager.setCustomHeadElement("<style>html{filter: invert(100%); -webkit-filter: invert(100%);}</style>");
  • inject a custom bit of html in the configuration form
WiFiManagerParameter custom_text("<p>This is just a text paragraph</p>");
  • inject a custom bit of html in a configuration form element Just add the bit you want added as the last parameter to the custom parameter constructor.
WiFiManagerParameter custom_mqtt_server("server", "mqtt server", "iot.eclipse", 40, " readonly");

Filter Networks

You can filter networks based on signal quality and show/hide duplicate networks.

  • If you would like to filter low signal quality networks you can tell WiFiManager to not show networks below an arbitrary quality %;

will not show networks under 10% signal quality. If you omit the parameter it defaults to 8%;

  • You can also remove or show duplicate networks (default is remove). Use this function to show (or hide) all networks.


Debug is enabled by default on Serial. To disable add before autoConnect



If you get compilation errors, more often than not, you may need to install a newer version of the ESP8266 core for Arduino.

Changes added on 0.8 should make the latest trunk work without compilation errors. Tested down to ESP8266 core 2.0.0. Please update to version 0.8

I am trying to keep releases working with release versions of the core, so they can be installed through boards manager, but if you checkout the latest version directly from github, sometimes, the library will only work if you update the ESP8266 core to the latest version because I am using some newly added function.

If you connect to the created configuration Access Point but the configuration portal does not show up, just open a browser and type in the IP of the web portal, by default

If trying to connect ends up in an endless loop, try to add setConnectTimeout(60) before autoConnect();. The parameter is timeout to try connecting in seconds.



  • removed 204 header response
  • fixed incompatibility with other libs using isnan and other std:: functions without namespace
  • a lot more reliable reconnecting to networks
  • custom html in custom parameters (for read only params)
  • custom html in custom parameter form (like labels)
  • custom head element (like custom css)
  • sort networks based on signal quality
  • remove duplicate networks
  • some css changes
  • bug fixes and speed improvements
  • added an alternative to waitForConnectResult() for debugging
  • changed setTimeout(seconds) to setConfigPortalTimeout(seconds)
  • fixed support for encoded characters in ssid/pass
  • made it compile on older versions of ESP8266 core as well, tested down to 2.0.0
  • added simple example for Custom IP
  • added static IP in station mode
  • added example of persisting custom IP to FS config.json
  • more option on portal homepage
  • added on PlatformIO
  • custom parameters
  • prettier
  • on demand config portal
  • commit #100 :D
  • Added to Arduino Boards Manager - Thanks Max
  • moved most stuff to PROGMEM
  • added signal quality and a nice little padlock to show which networks are encrypted
v0.4 - all of it user contributed changes - Thank you
  • added ability to password protect the configuration Access Point
  • callback for enter configuration mode
  • memory allocation improvements
  • removed the need for EEPROM and works with the 2.0.0 and above stable release of the ESP8266 for Arduino IDE package
  • removed restart on save of credentials
  • updated examples

needs the latest staging version (or at least a recent release of the staging version) to work


works with the staging release ver. 1.6.5-1044-g170995a, built on Aug 10, 2015 of the ESP8266 Arduino library.

Contributions and thanks

The support and help I got from the community has been nothing short of phenomenal. I can't thank you guys enough. This is my first real attept in developing open source stuff and I must say, now I understand why people are so dedicated to it, it is because of all the wonderful people involved.


Shawn A

Maximiliano Duarte


Niklas Wall

Jakub Piasecki

Peter Allan

John Little



Alberto Ricci Bitti




Sorry if i have missed anyone.