Captcha types

reCAPTCHA image grids

OpenAPI JSON llms.txt Markdown

How to send reCAPTCHA v2 image challenges (3x3, 4x4 and 1x1 tiles) and how to read the answer.

On this page

What to send
What you get
Dynamic grids
Tell us what Google said
Accuracy

Use recaptcha for the image challenges of reCAPTCHA v2: 3x3 grids, 4x4 grids, and the single tiles that appear after a click.

Create a reCAPTCHA jobThe endpoint with all fields and error codes.Browser extensionLet the extension read, send and click for you.

#What to send

Field	Meaning
`task`	The instruction text that the user reads, for example `Select all images with buses`. Send the full sentence.
`grid`	`3x3`, `4x4` or `1x1`.
`image_data`	Base64 pictures. For `3x3` and `4x4` send one picture of the whole grid. For `1x1` send 1 to 9 tile pictures.

Request

{
  "task": "Select all images with buses",
  "grid": "3x3",
  "image_data": ["BASE64_GRID"]
}

#What you get

The answer has one boolean per tile. true means: select this tile. Tiles run left to right, top to bottom. For 1x1 the answer has one boolean per picture you sent.

Answer

{"data": [false, true, false, true, true, false, false, false, false]}

In a 3x3 grid the tiles are numbered like this. The answer above selects tiles 2, 4 and 5.

Tile order

1 2 3
4 5 6
7 8 9

#Dynamic grids

Some challenges replace a tile with a new picture after you click it. Send each new tile as a 1x1 job, with the same task text. The browser extension does this for you.

#Tell us what Google said

After you submit the answer, Google accepts or rejects it. Send the verdict with Send feedback. It is optional, costs no quota and helps us improve the models.

#Accuracy

On a hand-checked test set of 453 challenges (October 2026) the model gets 98 % of the image cells right: 97.9 % for 1x1, 98.0 % for 3x3 and 97.5 % for 4x4. On Google's public reCAPTCHA demo, 99.7 % of user sessions got a token within up to 3 fresh challenges (299 of 300 sessions, 17 October 2026, one data-center IP). Other sites, IP addresses and settings can differ. The method and the raw numbers are on the compare page.

Solvecha is an independent service. It is not affiliated with NopeCHA, 2Captcha, CapSolver, Google or CloakHQ. Their names describe compatibility or recommendations only. Figures come from our own tests, see the compare page.