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.
- 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
- 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
- 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
- Proxies
- Error handling
- Get in touch
- License
(Coming soon) Install nuget package from nuget:
dotnet add package solvecaptcha-csharp
You can also install the library directly from GitHub.
Clone the repository:
git clone https://github.com/solvercaptcha/solvecaptcha-csharp.gitAdd the project as a dependency:
<ItemGroup>
<ProjectReference Include="path/to/solvecaptcha-csharp/SolveCaptcha/SolveCaptcha.csproj" />
</ItemGroup>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;| 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
When you submit any image-based captcha use can provide additional options to help solvecaptcha 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 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.
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 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");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 (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");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 (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);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 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");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");Use this method to solve Friendly Captcha. Returns a token to bypass the captcha.
Important
To successfully use the received token, the captcha widget must not be loaded on the page. To do this, you need to abort request to /friendlycaptcha/...module.min.js on the page. When the captcha widget is already loaded on the page, there is a high probability that the received token will not work.
FriendlyCaptcha captcha = new FriendlyCaptcha();
captcha.SetSiteKey("2FZFEVS1FZCGQ9");
captcha.SetUrl("https://example.com");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");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");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");Use this method to solve DataDome captcha.
Important
To solve the DataDome captcha, you must use a proxy. It is recommended to use [residential proxies].
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:[email protected]: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");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/");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/");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 incorrectlyYou 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");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
}
The code in this repository is licensed under the MIT License. See the LICENSE file for more details.