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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Steamworks provides screenshot capture through ISteamScreenshots, accessed with SteamScreenshots(). For a game that can use Steam’s normal screenshot behavior, leave screenshot handling with Steam. If your game needs to control which frame or image is saved, enable screenshot hooking, handle ScreenshotRequested_t, and submit the image with WriteScreenshot or AddScreenshotToLibrary. In either path, saving is asynchronous: wait for ScreenshotReady_t before attaching screenshot metadata.
What the Steam Screenshots API does
ISteamScreenshots lets a Steam game add images to the user’s local Steam screenshot library and attach supported metadata to them. It supports two different capture flows: Steam can capture the game in response to its screenshot hotkey, or the game can take responsibility for supplying the image. Choose between those flows before writing capture code; they determine who controls the captured frame and how much screenshot-specific work belongs in the game.
The Steam Overlay must be active in the game for the Screenshots system to be available. Steam’s default screenshot hotkey is F12, and users can change it in Steam’s In-Game settings. Obtain the interface through SteamScreenshots() after the game has initialized and can use the Steamworks API.
Choose who handles the screenshot
| Approach | Who captures the frame? | Use it when | What the game must do |
|---|---|---|---|
| Steam handles the request | Steam’s screenshot system | The ordinary Steam capture is suitable and the game does not need to supply a specially processed image. | Leave hooking disabled. The game can still receive ScreenshotReady_t and use a successful screenshot handle for supported metadata. |
| The game hooks requests | The game’s screenshot manager or rendering code | The game needs to control the selected frame or provide an image it has rendered or processed. | Enable hooking with HookScreenshots(true), handle ScreenshotRequested_t, and submit the image using WriteScreenshot or AddScreenshotToLibrary. |
Hooking is disabled by default. Enabling it changes responsibility: Steam signals that a screenshot is wanted, but your game must provide the image. Do not enable hooking unless the game has a path to capture and submit that image.
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Set up the interface and callbacks
Initialize Steamworks using the initialization and callback mechanism already used by your game. Once the Steam Screenshots interface is available, keep its pointer and register handlers for the request and ready callbacks. The example below shows the control flow in C++; it is intended to be integrated with your existing Steamworks initialization and application loop rather than used as a standalone program.
// Illustrative Steamworks C++ integration.
// Construct this handler after Steamworks has initialized.
class ScreenshotHandler {
public:
ScreenshotHandler()
: m_ready(this, &ScreenshotHandler::OnScreenshotReady),
m_requested(this, &ScreenshotHandler::OnScreenshotRequested),
m_screenshots(SteamScreenshots()) {}
void UseGameOwnedCapture(bool enabled) {
if (m_screenshots) {
m_screenshots->HookScreenshots(enabled);
}
}
void RequestCapture() {
if (m_screenshots) {
m_screenshots->TriggerScreenshot();
}
}
private:
void OnScreenshotRequested(ScreenshotRequested_t* event);
void OnScreenshotReady(ScreenshotReady_t* event);
ISteamScreenshots* m_screenshots;
STEAM_CALLBACK(ScreenshotHandler, OnScreenshotReady,
ScreenshotReady_t, m_ready);
STEAM_CALLBACK(ScreenshotHandler, OnScreenshotRequested,
ScreenshotRequested_t, m_requested);
};Use the callback registration form supported by the Steamworks SDK version integrated into your game. Keep the handler alive while callbacks may arrive, and continue processing Steamworks callbacks through your game’s established callback loop. The capture and file-writing functions do not replace that loop.
Capture through Steam or take control
Let Steam handle the default hotkey
If you leave hooking disabled, Steam handles its screenshot hotkey and adds the resulting image to the screenshot library. Your game does not need to intercept the request or submit an image. It can nevertheless process ScreenshotReady_t if it needs to associate supported metadata with a successfully saved screenshot.
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Trigger a screenshot in code
Call TriggerScreenshot() for an in-game screenshot button or another programmatic capture point. Its effect depends on the hook state: without hooking, the overlay takes the screenshot; with hooking enabled, the game’s screenshot manager is told that a screenshot is needed. Thus, the same trigger call does not mean the same capture work is performed in both modes.
void ScreenshotHandler::OnScreenshotRequested(
ScreenshotRequested_t* event) {
// Hooking is enabled: capture the intended game image here,
// then submit it with WriteScreenshot or AddScreenshotToLibrary.
// Supply the actual captured image; do not leave the request unanswered.
}The request callback is the point at which a hooked game should connect Steam’s request to its own capture pipeline. The exact rendering steps depend on the game; the API submission methods accept either raw RGB image data or an existing image file.
Submit an image to the screenshot library
Submit raw RGB data with WriteScreenshot
Use WriteScreenshot(void *pubRGB, uint32 cubRGB, int nWidth, int nHeight) when the game already has the screenshot as a raw RGB buffer. Pass the buffer, its byte count, width, and height. The API expects RGB data, not an encoded PNG or JPEG file. Keep the buffer valid for the call and ensure its byte count and dimensions describe the image you intend to submit.
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// rgbPixels must contain the captured image in raw RGB format.
// rgbByteCount, imageWidth, and imageHeight must match that buffer.
ScreenshotHandle handle = screenshots->WriteScreenshot(
rgbPixels, rgbByteCount, imageWidth, imageHeight);The returned value is a screenshot handle, but do not treat the return as proof that the save has completed. Saving is asynchronous; use the ready callback and check its result.
Add an existing image file with AddScreenshotToLibrary
Use AddScreenshotToLibrary(const char *pchFilename, const char *pchThumbnailFilename, int nWidth, int nHeight) when the image is already stored on disk. The documented formats are JPG, PNG, and TGA, and the screenshot path must be absolute. Pass the screenshot dimensions. If you supply a thumbnail, it must be 200 pixels wide and have the same aspect ratio as the screenshot. Pass NULL for the thumbnail path if you want Steam to create one.
// Both paths must be absolute when supplied.
// Passing NULL asks Steam to create the thumbnail.
ScreenshotHandle handle = screenshots->AddScreenshotToLibrary(
absoluteImagePath, NULL, imageWidth, imageHeight);For example, if the game writes a PNG to a temporary capture directory, pass that file’s absolute path rather than a path relative to the game’s working directory. Keep the file available for Steam to load while the asynchronous operation completes.
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Wait for the save before adding metadata
Both submission methods are asynchronous. Handle ScreenshotReady_t, inspect its EResult, and use the returned local screenshot handle for metadata only after the result indicates success. The documented callback includes the local handle and result. INVALID_SCREENSHOT_HANDLE is zero; screenshot handles remain valid only for the lifetime of the game process.
void ScreenshotHandler::OnScreenshotReady(ScreenshotReady_t* event) {
if (event->m_eResult != k_EResultOK) {
// Record or surface the failure; do not tag this screenshot.
return;
}
ScreenshotHandle saved = event->m_hLocal;
// Apply supported metadata to saved here, if needed.
}Use the handle from the successful ready callback for SetLocation, TagUser, or TagPublishedFile. The API reference lists a maximum location string length of 255 bytes, up to 32 users tagged per screenshot, and up to 32 Workshop items tagged per screenshot. These are API limits, not targets: attach only metadata that is meaningful for the image.
Handle common failures and edge cases
- No screenshot system or no callback: Confirm that the Steam Overlay is active for the game and that Steamworks callback processing continues after initialization. The screenshot feature is unavailable when the Overlay is not active.
- Hotkey behaves differently than expected: Check whether hooking is enabled. Without a hook Steam handles the capture; with a hook the game receives a request and must supply the image. F12 is the default, but the user can change it in Steam’s In-Game settings.
- Image does not appear after submission: Do not assume the returned handle means saving has finished. Wait for
ScreenshotReady_tand inspect its result. Documented failure outcomes include failure to load or parse the image and disk I/O failure. - File submission fails: Verify that the screenshot is a documented JPG, PNG, or TGA file and that its filename is an absolute path. If a thumbnail is supplied, check its 200-pixel width and matching aspect ratio; otherwise pass
NULLto request automatic thumbnail creation. - Metadata is missing or inconsistent: Apply it only after a successful ready result, using the callback’s local screenshot handle. Do not retain that handle for use beyond the game process.
- Hooked requests produce no library image: Enabling a hook makes image submission the game’s responsibility. Ensure the request handler reaches a capture path and calls one of the submission methods with valid image data or a readable file.
Reliability and implementation choices
The simplest implementation is to let Steam handle screenshots when its normal capture is sufficient. That leaves the capture itself to the overlay and limits game-owned screenshot logic. Use hooking when the game must select or provide the image; it gives the game control but also makes its capture and submission path responsible for completing each request.
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In either design, treat save completion as a separate stage from capture. A robust integration checks callback results, avoids attaching metadata on failure, and handles image-load or disk-I/O errors rather than assuming every request succeeds. The cited Steamworks documentation does not specify a performance comparison between these paths, so choose based on capture control and implementation needs, not an assumed speed advantage.
Or skip the browser setup
Steam’s API above is for screenshots of a Steam game. ScreenshotNeo is a separate website screenshot API and MCP server for developers; it does not replace ISteamScreenshots or capture a game frame. Use it when your task is capturing web pages instead. One GET request returns an image or PDF, with output format configurable:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo documentation for request options. It can accept cookie or consent banners and remove more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, with response headers identifying the page verdict and billing status. Its MCP server offers take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients.
ScreenshotNeo’s free plan includes 1,000 screenshots per month with no card. Paid plans start at $5 for 3,000 screenshots; the other monthly tiers are Growth at $15 for 15,000, Pro at $39 for 60,000, Scale at $99 for 250,000, and Business at $249 for 1,000,000. Yearly billing gives two months free, and every feature is available on every plan. Sign up for ScreenshotNeo’s free plan to try website captures without a card.
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