C# library for easy integration with the API of 2captcha captcha solving service to bypass recaptcha, funcaptcha, geetest and solve any other captchas.
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Published
Jan 23, 2026
$ dotnet add package 2captcha-csharpThe easiest way to quickly integrate 2Captcha into your code to automate solving of any types of captcha.
Install nuget package from nuget
instance can be created like this:
TwoCaptchaTwoCaptcha solver = new TwoCaptcha('YOUR_API_KEY');Also there are few options that can be configured:
solver.SoftId = 123;
solver.Callback = "https://your.site/result-receiver";
solver.DefaultTimeout = 120;
solver.RecaptchaTimeout = 600;
solver.PollingInterval = 10;| Option | Default value | Description |
|---|---|---|
| softId | - | your software ID obtained after publishing in 2captcha sofware catalog |
| callback | - | URL of your web-sever that receives the captcha recognition result. The URl should be first registered in pingback settings of your account |
| defaultTimeout | 120 | Polling timeout in seconds for all captcha types except ReCaptcha. Defines how long the module tries to get the answer from res.php API endpoint |
| recaptchaTimeout | 600 | Polling timeout for ReCaptcha in seconds. Defines how long the module tries to get the answer from res.php API endpoint |
| pollingInterval | 10 | Interval in seconds between requests to res.php API endpoint, setting values less than 5 seconds is not recommended |
IMPORTANT: once
Callbackis defined forTwoCaptchainstance, all methods return only the captcha ID and DO NOT poll the API to get the result. The result will be sent to the callback URL. To get the answer manually use getResult method
When you submit any image-based captcha use can provide additional options to help 2captcha workers to solve it properly.
| Option | Default Value | Description |
|---|---|---|
| numeric | 0 | Defines if captcha contains numeric or other symbols see more info in the API docs |
| minLength | 0 | minimal answer lenght |
| maxLength | 0 | maximum answer length |
| phrase | 0 | defines if the answer contains multiple words or not |
| caseSensitive | 0 | defines if the answer is case sensitive |
| calc | 0 | defines captcha requires calculation |
| lang | - | defines the captcha language, see the list of supported languages |
| hintImg | - | an image with hint shown to workers with the captcha |
| hintText | - | hint or task text shown to workers with the captcha |
Below you can find basic examples for every captcha type. Check out examples directory to find more examples with all available options.
Example below shows a basic solver call example with error handling.
Normal captcha = new Normal();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetMinLen(4);
captcha.SetMaxLen(20);
captcha.SetCaseSensitive(true);
captcha.SetLang("en");
try
{
await solver.Solve(captcha);
Console.WriteLine("Captcha solved: " + captcha.Code);
}
catch (Exception e)
{
Console.WriteLine("Error occurred: " + e.Message);
}To bypass a normal captcha (distorted text on image) use the following method. This method also can be used to recognize any text on the image.
Normal captcha = new Normal();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetNumeric(4);
captcha.SetMinLen(4);
captcha.SetMaxLen(20);
captcha.SetPhrase(true);
captcha.SetCaseSensitive(true);
captcha.SetCalc(false);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Type red symbols only");This method can be used to bypass a captcha that requires to answer a question provided in clear text.
Text captcha = new Text();
captcha.SetText("If tomorrow is Saturday, what day is today?");
captcha.SetLang("en");Use this method to solve ReCaptcha V2 and obtain a token to bypass the protection.
ReCaptcha captcha = new ReCaptcha();
captcha.SetSiteKey("6Le-wvkSVVABCPBMRTvw0Q4Muexq1bi0DJwx_mJ-");
captcha.SetUrl("https://mysite.com/page/with/recaptcha");
captcha.SetInvisible(true);
captcha.SetEnterprise(false);
captcha.SetAction("verify");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");This method provides ReCaptcha V3 solver and returns a token.
ReCaptcha captcha = new ReCaptcha();
captcha.SetSiteKey("6Le-wvkSVVABCPBMRTvw0Q4Muexq1bi0DJwx_mJ-");
captcha.SetUrl("https://mysite.com/page/with/recaptcha");
captcha.SetVersion("v3");
captcha.SetEnterprise(false);
captcha.SetDomain("google.com");
captcha.SetAction("verify");
captcha.SetScore(0.3);
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");FunCaptcha (Arkoselabs) solving method. Returns a token.
FunCaptcha captcha = new FunCaptcha();
captcha.SetSiteKey("69A21A01-CC7B-B9C6-0F9A-E7FA06677FFC");
captcha.SetUrl("https://mysite.com/page/with/funcaptcha");
captcha.SetSUrl("https://client-api.arkoselabs.com");
captcha.SetUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36");
captcha.SetData("anyKey", "anyValue");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");Method to solve GeeTest puzzle captcha. Returns a set of tokens as JSON.
GeeTest captcha = new GeeTest();
captcha.SetGt("f2ae6cadcf7886856696502e1d55e00c");
captcha.SetApiServer("api-na.geetest.com");
captcha.SetChallenge("12345678abc90123d45678ef90123a456b");
captcha.SetUrl("https://mysite.com/captcha.html");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");Method to solve GeeTestV4 puzzle captcha. Returns a set of tokens as JSON.
GeeTestV4 captcha = new GeeTestV4();
captcha.SetCaptchaId("72bf15796d0b69c43867452fea615052");
captcha.SetChallenge("12345678abc90123d45678ef90123a456b");
captcha.SetUrl("https://mysite.com/captcha.html");Use this method to solve hCaptcha challenge. Returns a token to bypass captcha.
HCaptcha captcha = new HCaptcha();
captcha.SetSiteKey("10000000-ffff-ffff-ffff-000000000001");
captcha.SetUrl("https://www.site.com/page/");
captcha.SetData("foo");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");Token-based method to solve KeyCaptcha.
KeyCaptcha captcha = new KeyCaptcha();
captcha.SetUserId(10);
captcha.SetSessionId("493e52c37c10c2bcdf4a00cbc9ccd1e8");
captcha.SetWebServerSign("9006dc725760858e4c0715b835472f22");
captcha.SetWebServerSign2("2ca3abe86d90c6142d5571db98af6714");
captcha.SetUrl("https://www.keycaptcha.ru/demo-magnetic/");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");Token-based method to bypass Capy puzzle captcha.
Capy captcha = new Capy();
captcha.SetSiteKey("PUZZLE_Abc1dEFghIJKLM2no34P56q7rStu8v");
captcha.SetUrl("https://www.mysite.com/captcha/");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");Grid method is originally called Old ReCaptcha V2 method. The method can be used to bypass any type of captcha where you can apply a grid on image and need to click specific grid boxes. Returns numbers of boxes.
Grid captcha = new Grid();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetRows(3);
captcha.SetCols(3);
captcha.SetPreviousId(0);
captcha.SetCanSkip(false);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Select all images with an Orange");Canvas method can be used when you need to draw a line around an object on image. Returns a set of points' coordinates to draw a polygon.
Canvas captcha = new Canvas();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetPreviousId(0);
captcha.SetCanSkip(false);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Draw around apple");ClickCaptcha method returns coordinates of points on captcha image. Can be used if you need to click on particular points on the image.
Coordinates captcha = new Coordinates();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Select all images with an Orange");This method can be used to solve a captcha that asks to rotate an object. Mostly used to bypass FunCaptcha. Returns the rotation angle.
Rotate captcha = new Rotate();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetAngle(40);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Put the images in the correct way up");This method can be used to solve a audio captcha
AudioCaptcha captcha = new AudioCaptcha();
byte[] bytes = File.ReadAllBytes("../../resources/audio-en.mp3");
string base64EncodedImage = Convert.ToBase64String(bytes);
captcha.SetBase64(base64EncodedImage);Use this method to solve Yandex and obtain a token to bypass the protection.
Yandex captcha = new Yandex();
captcha.SetSiteKey("Y5Lh0tiycconMJGsFd3EbbuNKSp1yaZESUOIHfeV");
captcha.SetUrl("https://rutube.ru");Use this method to solve Lemin and obtain a token to bypass the protection.
Lemin captcha = new Lemin();
captcha.SetCaptchaId("CROPPED_d3d4d56_73ca4008925b4f83a8bed59c2dd0df6d");
captcha.SetApiServer("api.leminnow.com");
captcha.SetUrl("http://sat2.aksigorta.com.tr");Use this method to solve Turnstile and obtain a token to bypass the protection.
Turnstile captcha = new Turnstile();
captcha.SetSiteKey("0x4AAAAAAAChNiVJM_WtShFf");
captcha.SetUrl("https://ace.fusionist.io");
captcha.SetData("foo");
captcha.SetPageData("bar");
captcha.SetAction("baz");Use this method to solve AmazonWaf and obtain a token to bypass the protection.
AmazonWaf captcha = new AmazonWaf();
captcha.SetSiteKey("AQIDAHjcYu/GjX+QlghicBgQ/7bFaQZ+m5FKCMDnO+vTbNg96AF5H1K/siwSLK7RfstKtN5bAAAAfjB8BgkqhkiG9w0BBwagbzBtAgEAMGgGCSqGSIb3DQEHATAeBglg");
captcha.SetUrl("https://non-existent-example.execute-api.us-east-1.amazonaws.com");
captcha.SetContext("test_iv");
captcha.SetIV("test_context");These methods can be used for manual captcha submission and answer polling.
string captchaId = await solver.Send(captcha);
Task.sleep(20 * 1000);
string code = await solver.GetResult(captchaId);Use this method to get your account's balance
double balance = await solver.Balance();Use this method to report good or bad captcha answer.
await solver.Report(captcha.Id, true); // captcha solved correctly
await solver.Report(captcha.Id, false); // captcha solved incorrectlyIf case of an error captcha solver throws an exception. It's important to properly handle these cases. We recommend to use try catch to handle exceptions.
try
{
await solver.Solve(captcha);
}
catch (ValidationException e)
{
// invalid parameters passed
}
catch (NetworkException e)
{
// network error occurred
}
catch (ApiException e)
{
// api respond with error
}
catch (TimeoutException e)
{
// captcha is not solved so far
}