solvecaptcha-csharp 0.0.3-alpha

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C# Captcha solver (.NET): Bypass reCAPTCHA, Cloudflare, hCaptcha, GeeTest and more

Use the C# captcha solver to automatically bypass any captcha — including reCAPTCHA v2, Invisible, v3, Enterprise, hCaptcha, Cloudflare Turnstile, GeeTest sliders, Amazon WAF, FunCaptcha, and both image and text-based challenges.

✅ Supported сaptcha solvers

To get started quickly, check out the Captcha solver API documentation.

Helpful links:

• reCAPTCHA v2 solver
• reCAPTCHA v3 solver
• hCaptcha solver
• Text and image captcha solver
• Cloudflare captcha solver (Turnstile)
• Amazon captcha solver (AWS WAF)
• GeeTest solver
• FunCaptcha (Arkose Labs) solver
• Others

🛠️ Features

• Fast and fully automated captcha bypass
• Native support for C# / .NET environments
• Works with Selenium WebDriver, PuppeteerSharp, or HTTP clients
• Clean and async-friendly code structure
• Pay only for successful solves
• 99.9% uptime
• 24/7 support for developers and integration teams

📦 Use Cases

• Web scraping behind reCAPTCHA or Cloudflare
• Automating login and registration forms protected by captcha
• Integrating captcha solving in .NET testing pipelines
• Bot-detection bypass in QA and security research
• Custom automation flows in enterprise C# applications

Need help integrating with your C# project? Open an issue or fork this repo to contribute.

• C# Captcha solver (.NET): Bypass reCAPTCHA, Cloudflare, hCaptcha, GeeTest and more
  • Installation
  • Configuration
    • SolveCaptcha instance options
  • Solve captcha
    • Captcha options
    • Basic example
    • Normal Captcha
    • Text Captcha
    • reCAPTCHA v2
    • reCAPTCHA v3
    • FunCaptcha
    • GeeTest
    • GeeTest v4
    • hCaptcha
    • KeyCaptcha
    • Capy
    • Grid
    • Canvas
    • ClickCaptcha
    • Rotate
    • Audio Captcha
    • Yandex
    • Lemin Cropped Captcha
    • Cloudflare Turnstile
    • Amazon WAF
    • Friendly Captcha
    • MTCaptcha
    • Cutcaptcha
    • CyberSiARA
    • DataDome
    • atbCAPTCHA
    • Tencent
  • Other methods
    • send / getResult
    • balance
    • report
  • Proxies
  • Error handling
  • Get in touch
• License

Installation

(Coming soon) Install nuget package from nuget:

dotnet add package solvecaptcha-csharp

Installation from GitHub

You can also install the library directly from GitHub.

Clone the repository:

git clone https://github.com/solvercaptcha/solvecaptcha-csharp.git

Add the project as a dependency:

<ItemGroup>
  <ProjectReference Include="path/to/solvecaptcha-csharp/SolveCaptcha/SolveCaptcha.csproj" />
</ItemGroup>

Configuration

SolveCaptcha instance can be created like this:

SolveCaptcha solver = new SolveCaptcha('YOUR_API_KEY');

Also there are few options that can be configured:

solver.DefaultTimeout = 120;
solver.RecaptchaTimeout = 600;
solver.PollingInterval = 10;

SolveCaptcha instance options

Option	Default value	Description
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

To get the answer manually use getResult method

Solve captcha

When you submit any image-based captcha use can provide additional options to help solvecaptcha workers to solve it properly.

Captcha options

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 length
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.

Basic example

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);
}

Normal Captcha

^{API method description.}

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");

Text Captcha

^{API method description.}

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");

reCAPTCHA v2

^{API method description.}

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");

reCAPTCHA v3

^{API method description.}

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

^{API method description.}

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");

GeeTest

^{API method description.}

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");

GeeTest v4

^{API method description.}

Method to solve GeeTest v4 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");

hCaptcha

^{API method description.}

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");

KeyCaptcha

^{API method description.}

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");

Capy

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

^{API method description.}

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

^{API method description.}

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

^{API method description.}

ClickCaptcha (Coordinates) 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");

Rotate

^{API method description.}

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");

Audio Captcha

This method can be used to solve a audio captcha (mp3 formats only). You must provide the language as lang = 'en'. Supported languages are "en", "ru", "de", "el", "pt", "fr".

AudioCaptcha captcha = new AudioCaptcha();
byte[] bytes = File.ReadAllBytes("../../resources/audio-en.mp3");
string base64EncodedImage = Convert.ToBase64String(bytes);
captcha.SetBase64(base64EncodedImage);

Yandex

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");

Lemin Cropped Captcha

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");

Cloudflare Turnstile

^{API method description.}

Use this method to solve Cloudflare 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");

Amazon WAF

Use this method to solve Amazon WAF Captcha also known as AWS WAF Captcha is a part of Intelligent threat mitigation for Amazon AWS. Returns JSON with the token.

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");

Friendly Captcha

Use this method to solve Friendly Captcha. Returns a token to bypass the captcha.

FriendlyCaptcha captcha = new FriendlyCaptcha();
captcha.SetSiteKey("2FZFEVS1FZCGQ9");
captcha.SetUrl("https://example.com");

MTCaptcha

Use this method to solve MTCaptcha. Returns a token to bypass the captcha.

MTCaptcha captcha = new MTCaptcha();
captcha.SetSiteKey("MTPublic-KzqLY1cKH");
captcha.SetPageUrl("https://mysite.com/page/with/mtcaptcha");

Cutcaptcha

Use this method to solve Cutcaptcha. Returns a token to bypass the captcha.

Cutcaptcha captcha = new Cutcaptcha();
captcha.SetMiseryKey("a1488b66da00bf332a1488993a5443c79047e752");
captcha.SetPageUrl("https://example.cc/foo/bar.html");
captcha.SetApiKey("SAb83IIB");

CyberSiARA

Use this method to solve CyberSiARA. Returns a token to bypass the captcha.

CyberSiARA cyberSiARA = new CyberSiARA();
cyberSiARA.SetMasterUrlId("tpjOCKjjpdzv3d8Ub2E9COEWKt1vl1Mv");
cyberSiARA.SetPageUrl("https://demo.mycybersiara.com/");
cyberSiARA.SetUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36");

DataDome

Use this method to solve DataDome captcha.

DataDome dataDome = new DataDome();
dataDome.SetCapthaUrl("https://geo.captcha-delivery.com/captcha/?initialCid=AHrlqAAA...P~XFrBVptk&t=fe&referer=https%3A%2F%2Fhexample.com&s=45239&e=c538be..c510a00ea");
dataDome.SetPageUrl("https://example.com/");
dataDome.SetProxy("http", "username:password@1.2.3.4:5678");
dataDome.SetUserAgent("Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Mobile Safari/537.3");

atbCAPTCHA

Use this method to solve atbCAPTCHA. Returns a token to bypass the captcha.

AtbCAPTCHA atbCAPTCHA = new AtbCAPTCHA();
atbCAPTCHA.SetAppId("af23e041b22d000a11e22a230fa8991c");
atbCAPTCHA.SetApiServer("https://cap.aisecurius.com");
atbCAPTCHA.SetPageUrl("https://www.example.com/");

Tencent

Use this method to solve Tencent captcha. Returns a token to bypass the captcha.

Tencent tencent = new Tencent();
tencent.SetAppId("190014885");
tencent.SetPageUrl("https://www.example.com/");

Other methods

send / getResult

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);

balance

^{API method description.}

Use this method to get your account's balance

double balance = await solver.Balance();

report

^{API method description.}

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 incorrectly

Proxies

You can pass your proxy as an additional argument for methods: recaptcha, funcaptcha, geetest, geetest v4, hcaptcha, keycaptcha, capy puzzle, lemin, cloudflare turnstile, amazon waf, friendly captcha, mtcaptcha, cutcaptcha, cybersiara, datadome, atbcaptcha, tencent and etc. The proxy will be forwarded to the API to solve the captcha.

captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

Error handling

If 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. The list of all errors can be found in the API documentation.

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
}

Get in touch

<a href="mailto:info@solvecaptcha.com"><img src="https://github.com/user-attachments/assets/539df209-7c85-4fa5-84b4-fc22ab93fac7" width="80" height="30" alt="Send email to support"></a> <a href="https://solvecaptcha.com/support/faq#create-ticket"><img src="https://github.com/user-attachments/assets/be044db5-2e67-46c6-8c81-04b78bd99650" width="81" height="30" alt="Create ticket"></a>

License

The code in this repository is licensed under the MIT License. See the LICENSE file for more details.