Use the browser for capture and PHP for storage. For an HTML element or page region, render the DOM with html2canvas, export the canvas with toBlob(), upload the resulting file through fetch() and FormData, then validate its MIME type and move it with PHP’s move_uploaded_file(). If you need the user’s actual screen, window or tab instead, use navigator.mediaDevices.getDisplayMedia(); it requires HTTPS and explicit permission.
Choose what “screenshot” means
There are two different browser jobs, and choosing the wrong API is the most common source of disappointing results.
Capture an HTML element or page region
html2canvas reconstructs visible DOM information into a canvas. It is suitable for a report, dashboard, invoice, chart or selected page section. It does not capture browser chrome and is not guaranteed to match every composited layer pixel for pixel. CSS effects, embedded content and cross-origin images can differ from the live display.
Capture the actual display
getDisplayMedia() asks the user to choose a screen, window or browser tab. The returned MediaStream is assigned to a video element, then one video frame is drawn into a canvas. The call must occur from a user action such as a button click, runs in a secure HTTPS context, and is not available with equal support in every browser.
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| Requirement | DOM capture | Display capture |
|---|---|---|
| API | html2canvas |
navigator.mediaDevices.getDisplayMedia() |
| Permission prompt | Usually none | Always user-selected permission |
| Target | Element or document DOM | Screen, window or tab stream |
| HTTPS | Recommended for site assets | Required |
| Fidelity | DOM reconstruction, not a true display shot | Actual rendered video frame |
| Cross-origin concern | Images without CORS can taint the canvas | Permission and browser support are the main constraints |
Complete DOM-element implementation
The following example captures #capture, creates a PNG Blob, posts it as a multipart upload and reports the filename returned by PHP.
HTML
<button id="save-shot" type="button">Save screenshot</button>
<div id="capture">
<h1>Monthly report</h1>
<p>This panel is the capture target.</p>
</div>
<p id="status" role="status"></p>
<script src="https://cdn.jsdelivr.net/npm/html2canvas@1.4.1/dist/html2canvas.min.js"></script>
<script src="app.js" defer></script>JavaScript upload
const button = document.querySelector('#save-shot');
const status = document.querySelector('#status');
button.addEventListener('click', async () => {
button.disabled = true;
status.textContent = 'Rendering…';
try {
const canvas = await html2canvas(document.querySelector('#capture'), {
scale: window.devicePixelRatio,
useCORS: true,
backgroundColor: '#ffffff'
});
const blob = await new Promise((resolve, reject) => {
canvas.toBlob(result => result ? resolve(result) : reject(new Error('Canvas export failed')), 'image/png');
});
const form = new FormData();
form.append('shot', blob, 'screenshot.png');
status.textContent = 'Uploading…';
const response = await fetch('/save-screenshot.php', {
method: 'POST',
body: form,
credentials: 'same-origin'
});
const data = await response.json();
if (!response.ok) throw new Error(data.error || 'Upload failed');
status.textContent = `Saved as ${data.file}`;
} catch (error) {
status.textContent = error.message;
} finally {
button.disabled = false;
}
});The scale option uses the device pixel ratio for sharper high-DPI output. useCORS: true only helps when the image server sends an appropriate CORS header; it cannot override another origin’s policy.
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Exporting the canvas safely
canvas.toDataURL('image/png') returns a base64 data URL and is convenient for a small download, but it creates the complete image as a large in-memory string. For uploads, toBlob() avoids that extra encoding step. PNG is the default lossless format; request JPEG or WebP when your browser and quality requirements allow smaller files.
// Optional local download
const link = document.createElement('a');
link.download = 'screenshot.png';
link.href = canvas.toDataURL('image/png');
link.click();If a canvas contains pixels loaded from another origin without permission, reading or exporting it throws a security error because the canvas is tainted. Host the asset on the same origin, configure CORS on the asset server, or omit that asset from the capture.
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- 【4K HDMI Input, 2K@30Hz Recording】Powered by a true USB 3.0 high-speed interface, the capture card supports up to 4K@30Hz HDMI input and records at 2K@30Hz or 1080P@60Hz. Perfect for gamers, streamers, and professionals who need crisp, smooth video for live streaming, gameplay recording, or online meetings.
- 【Ultra Low Latency Screen Sharing】Built with a premium aluminum alloy shell and advanced chipset for stable heat dissipation, ensuring ultra-low latency transmission. Capture high-quality video and dual-channel audio in real time—no lag, no frame drop—ideal for Twitch, YouTube, or OBS streaming.
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- 【What You Get】Includes: HDMI Capture Card, USB 3.0 to USB-C Adapter, User Manual. Tips: Make sure your tablet’s OTG function is enabled before connecting. Test your HDMI device with a monitor first to confirm video and audio output, then connect to the Video Capture Card for recording.
Capture the user’s screen, window or tab
Use this path when “screenshot” means what the user can currently see rather than what your DOM contains.
<button id="share-screen" type="button">Capture screen</button>
<video id="preview" autoplay muted playsinline hidden></video>
<script>
const share = document.querySelector('#share-screen');
share.addEventListener('click', async () => {
let stream;
try {
stream = await navigator.mediaDevices.getDisplayMedia({
video: { displaySurface: 'browser' },
audio: false
});
const video = document.querySelector('#preview');
video.srcObject = stream;
await new Promise(resolve => video.onloadedmetadata = resolve);
await video.play();
const canvas = document.createElement('canvas');
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
canvas.getContext('2d').drawImage(video, 0, 0);
const blob = await new Promise((resolve, reject) =>
canvas.toBlob(b => b ? resolve(b) : reject(new Error('Export failed')), 'image/png'));
const form = new FormData();
form.append('shot', blob, 'display.png');
const response = await fetch('/save-screenshot.php', { method: 'POST', body: form });
if (!response.ok) throw new Error('Server rejected the upload');
stream.getTracks().forEach(track => track.stop());
} catch (error) {
if (error.name === 'NotAllowedError') alert('Select a surface, or allow screen sharing.');
else alert(error.message);
if (stream) stream.getTracks().forEach(track => track.stop());
}
});
</script>Invoke getDisplayMedia() directly in the click handler; browsers may reject calls made later by a timer or without transient user activation. Check navigator.mediaDevices before showing the control, explain the browser requirement, and provide the DOM-capture fallback when screen sharing is unavailable.
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PHP endpoint: validate before saving
Never trust the filename or MIME value supplied by the browser. Reject malformed upload structures, enforce a size limit, inspect the temporary file with PHP’s Fileinfo extension, permit only formats you intend to serve, generate a random server-side name and store uploads outside an executable directory when possible.
<?php
header('Content-Type: application/json');
function fail(int $status, string $message): never {
http_response_code($status);
echo json_encode(['error' => $message]);
exit;
}
if (!isset($_FILES['shot']) || is_array($_FILES['shot']['error'])) {
fail(400, 'Malformed upload');
}
if ($_FILES['shot']['error'] !== UPLOAD_ERR_OK) {
fail(400, 'Upload error: ' . $_FILES['shot']['error']);
}
if ($_FILES['shot']['size'] > 5_000_000) {
fail(413, 'File exceeds the 5 MB limit');
}
$tmp = $_FILES['shot']['tmp_name'];
$finfo = new finfo(FILEINFO_MIME_TYPE);
$mime = $finfo->file($tmp);
$extensions = [
'image/png' => 'png',
'image/jpeg' => 'jpg',
'image/webp' => 'webp'
];
$extension = $extensions[$mime] ?? null;
if ($extension === null) {
fail(415, 'Unsupported image type');
}
$directory = __DIR__ . '/uploads';
if (!is_dir($directory) && !mkdir($directory, 0750, true)) {
fail(500, 'Storage directory is unavailable');
}
$name = bin2hex(random_bytes(16)) . '.' . $extension;
$destination = $directory . '/' . $name;
if (!move_uploaded_file($tmp, $destination)) {
fail(500, 'Could not persist upload');
}
echo json_encode(['file' => $name]);move_uploaded_file() accepts only files received through PHP’s HTTP POST upload mechanism and can overwrite an existing destination. Random names prevent collisions and avoid using attacker-controlled paths. Add authentication, CSRF protection, rate limiting, retention rules and access controls for a public application. Configure PHP’s upload_max_filesize and post_max_size above your application limit, while keeping the application check as the final policy.
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Quality, size and performance choices
- Large or full-page captures: prefer
toBlob(); a data URL duplicates memory and can exceed request limits. - Sharpness: device-pixel-ratio scaling improves detail but increases canvas dimensions, memory use and upload size. Cap the scale for very large regions.
- Format: PNG preserves text and transparency; JPEG is smaller for photographs but loses transparency; WebP can reduce size where your consumers support it.
- Long pages: lazy-loaded images may not be present when rendering. Scroll or otherwise load required content first, and wait for fonts and images.
- Server reliability: return JSON for both success and failure, set explicit HTTP status codes, and treat a successful HTTP response as valid only after parsing the JSON body.
Common failures and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Blank or incomplete element | Fonts, images or lazy content have not loaded | Wait for required resources and capture after the UI settles. |
| “Tainted canvas” or security exception | Cross-origin image lacks CORS permission | Serve it same-origin or configure the image server’s CORS headers; useCORS alone is insufficient. |
| Screen prompt never appears | Call was not made from a user gesture, or page is not HTTPS | Call directly from a click and deploy in a secure context. |
NotAllowedError |
User cancelled or denied surface selection | Explain the prompt and allow another attempt; do not retry invisibly. |
| HTTP 400 from PHP | Wrong field name or PHP upload error | Ensure the client uses form.append('shot', ...), inspect $_FILES['shot']['error'], and check PHP limits. |
| HTTP 415 | Fileinfo detected an unapproved type | Export PNG/JPEG/WebP and add only formats your application can safely process. |
| HTTP 500 on move | Missing directory or permissions | Create the directory with restricted permissions and give PHP’s worker write access. |
| Upload succeeds but file is unsafe to serve | Uploads are in an executable web path | Store outside executable paths, disable script execution there and serve through controlled download responses. |
Or skip the browser setup
When you need a screenshot of a public URL rather than a visitor’s private screen, ScreenshotNeo provides a single API request. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups and chat widgets. Bot checks, blank pages, timeouts, failed loads and cache hits are not billed, and response headers identify the page verdict and billing result.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for options such as full-page lazy-image loading, CSS-element capture, device presets, custom viewport and retina scale, PDF output, custom CSS or JavaScript, waits, request blocking, headers, cookies, geolocation, resizing, TTL caching, signed image links, asynchronous webhooks, bulk capture and usage reporting. Its MCP server exposes take_screenshot, get_page_info and capture_pdf to Claude, Cursor and other MCP clients.
Python
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const fs = await import('node:fs/promises');
await fs.writeFile('shot.webp', Buffer.from(await res.arrayBuffer()));The Free plan includes 1,000 screenshots each month with no card. Paid plans start at $5 for 3,000 shots; every feature is included on every plan, and yearly billing gives two months free. Create a free ScreenshotNeo account.
Security and operational checklist
- Require HTTPS for screen capture and authenticated upload endpoints.
- Validate PHP’s upload error, byte size and Fileinfo MIME independently of browser metadata.
- Generate random names; never concatenate an uploaded filename into a path.
- Keep upload directories non-executable and define retention and deletion policies.
- Limit dimensions and request rates if users can submit many high-resolution images.
- Stop every display-capture track after the frame is drawn so the browser indicator and permission session end.
- Log failures without logging image contents or credentials.
Frequently Asked Questions
Can JavaScript capture the browser address bar or other browser chrome?
No. DOM capture sees page content, while display capture records only the surface the user explicitly selects; browser security does not expose unrestricted browser chrome.
Why is my screenshot different from what I see?
html2canvas rebuilds the DOM rather than taking a compositor-level picture. Unsupported CSS, unloaded resources and cross-origin images can therefore change the result.
Should I send a base64 string to PHP?
For small local previews it can be acceptable, but production uploads should use a Blob in multipart FormData to avoid the extra memory and decoding overhead of a data URL.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
