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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchTo export a Leaflet map with html2canvas, give the map container a real height, configure its tile layer for cross-origin access when the provider supports it, wait for tiles and overlays to finish loading, then render the map element and download the canvas as a PNG. The important limitation: html2canvas rebuilds an image from DOM properties; it does not take a literal browser screenshot. Tiles without compatible CORS headers can therefore appear blank or make the canvas unreadable.
What you need before capturing
- A Leaflet map inside an element with non-zero width and height. A fixed CSS height is the simplest choice.
- html2canvas loaded on the page and a map element you can select.
- A tile provider whose usage terms permit your use and whose server supports the cross-origin access needed for exporting pixels.
- A capture triggered only after the map tiles and any overlays have loaded.
Leaflet provides the interactive map library, not the underlying map imagery. Choose a tile provider separately, retain its required attribution, and follow its production and usage policy. Leaflet lists providers including Mapbox, Bing Maps, Esri ArcGIS, HERE Maps, and Stadia Maps; their availability, terms, and CORS behavior are provider-specific. See Leaflet and its quick start.
Give the map a defined size
Leaflet needs a visible container to lay out the map. Set its height explicitly and ensure its width is not zero or hidden when you initialize or capture it.
#map {
width: 100%;
height: 480px;
}If the map is in a tab, modal, or other initially hidden region, reveal it and let Leaflet recalculate its size before capturing. A zero-size or stale layout can yield an empty or clipped image even when the tile requests succeed.
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Set up Leaflet and html2canvas
The example below assumes Leaflet and html2canvas are already loaded, a tile URL and attribution appropriate to your provider, and a page containing <div id="map"></div>. Keep the provider attribution visible in the map or include it in the final output as required by the provider. Do not treat a public demo tile endpoint as unrestricted production hosting.
const map = L.map('map').setView([51.505, -0.09], 13);
const tiles = L.tileLayer('YOUR_TILE_PROVIDER_URL', {
attribution: 'YOUR_PROVIDER_ATTRIBUTION',
crossOrigin: true
}).addTo(map);Replace the URL and attribution with the values specified by your tile provider. Leaflet’s TileLayer reference describes crossOrigin as an option for accessing tile pixel data. Some providers require a particular string or request configuration rather than simply true; use the provider’s documented value. A provider may also require a referrerPolicy for token or referrer validation.
Wait for map content, then download a PNG
Call html2canvas only once the base tiles and any asynchronous overlays you depend on have completed. The following helper waits for Leaflet’s currently loading tiles, then captures the map. If your application adds overlays or changes layers asynchronously, include those operations in the readiness logic too.
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function waitForTiles(layer) {
return new Promise((resolve) => {
// If all tiles are already loaded, there may be no pending load event.
if (layer._loading !== true) {
resolve();
return;
}
layer.once('load', resolve);
});
}
async function downloadLeafletMap() {
const mapEl = document.querySelector('#map');
if (!mapEl || mapEl.clientWidth === 0 || mapEl.clientHeight === 0) {
throw new Error('Map element is missing or has no visible dimensions.');
}
await waitForTiles(tiles);
const canvas = await html2canvas(mapEl, {
useCORS: true,
backgroundColor: null,
scale: window.devicePixelRatio,
logging: false
});
const link = document.createElement('a');
link.download = 'leaflet-map.png';
link.href = canvas.toDataURL('image/png');
link.click();
}
downloadLeafletMap().catch(console.error);The helper checks Leaflet’s internal _loading property to handle the case where loading has already finished. Because that property is internal, adapt the readiness check to your application if you need a stable, application-level guarantee: for example, track the tile layer’s loading and load events from the moment it is added, and separately await data-backed overlays. The core export pattern uses the html2canvas Promise and canvas.toDataURL().
useCORS: true asks html2canvas to load images through CORS where supported; it cannot grant permission the tile server has not sent. backgroundColor: null preserves transparency where the rendered content permits it. scale: window.devicePixelRatio creates a higher-resolution output on high-density displays, but increases memory use and can run into browser canvas-size limits. Set logging: false to silence html2canvas logging.
Crop the output or set its dimensions
html2canvas supports crop coordinates and dimensions through x, y, width, and height. Set them when you need a defined portion or output size rather than relying on the viewport or the map element’s natural dimensions.
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const canvas = await html2canvas(mapEl, {
useCORS: true,
x: 0,
y: 0,
width: 800,
height: 500,
scale: 1
});The values are capture coordinates and dimensions; choose them to match the intended region and confirm the resulting canvas dimensions before using it downstream. html2canvas’s configuration reference documents these and other options.
Exclude controls or other page elements
To omit Leaflet controls or decorations from a clean map export, mark them with data-html2canvas-ignore where appropriate, or use the ignoreElements configuration callback. These options remove selected DOM elements from the html2canvas render; they do not fix a tile’s CORS restrictions.
const canvas = await html2canvas(mapEl, {
useCORS: true,
ignoreElements: (element) => element.classList.contains('export-ignore')
});Why tiles are missing or the canvas cannot be downloaded
The most common cause is cross-origin access. Browsers restrict reading pixels from images loaded from another origin unless that server grants access with a compatible Access-Control-Allow-Origin response header. If a tile server does not provide the required header, html2canvas cannot make the tile readable by setting useCORS alone. The browser may omit the tile, or the canvas may become tainted and reject toDataURL().
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Leaflet’s crossOrigin option and html2canvas’s useCORS address different parts of the path: Leaflet configures tile image requests for pixel access, while html2canvas attempts CORS-aware loading when it reconstructs the DOM. Neither overrides the server’s policy. The html2canvas FAQ explains the tainted-canvas restriction and possible proxy approach at its FAQ.
What html2canvas can and cannot reproduce
html2canvas reconstructs a picture from DOM information instead of taking a browser screenshot. Unsupported CSS, cross-origin iframes, and already-tainted canvases may be missing or unreadable; its supported-features documentation is at html2canvas features.
Leaflet’s HTML controls and HTML-based L.divIcon content are not rasterized by the separate leaflet-image exporter. For vector layers that must appear in an export, Leaflet can render vectors to Canvas with renderer: L.canvas() or preferCanvas: true where appropriate. This does not make arbitrary HTML controls part of a canvas-rendered vector layer. See the leaflet-image documentation.
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Troubleshooting checklist
| Symptom | Likely cause | What to check or change |
|---|---|---|
| Tiles are blank or missing | Capture started before tiles loaded, the tile request failed, or the provider does not grant compatible CORS access. | Wait for the layer’s load event; inspect browser Network and Console panels; verify tile responses include the required CORS header. If not, use a provider that supports the needed access or a properly authorized same-origin proxy. |
toDataURL() throws a security error |
A cross-origin image tainted the canvas. | Fix the tile server CORS path or proxy the image through a server you control and are permitted to use. allowTaint does not make a tainted canvas safely readable. |
| Map is empty or clipped | The element has zero dimensions, is hidden, or the capture viewport does not match its scroll dimensions. | Confirm non-zero width and height, make the map visible, call Leaflet’s size update after revealing it, and align windowWidth and windowHeight with the element’s scroll dimensions where needed. |
| Markers or custom overlays are absent | The overlay was not ready, uses unsupported DOM or CSS, or is an HTML-based icon not handled by a canvas exporter. | Wait for overlay data and rendering; inspect whether it is DOM, SVG, or canvas; use Canvas rendering for vector layers that must be exported, or retain html2canvas for supported DOM elements. |
| Image is soft, oversized, or capture fails on a large map | High device-pixel scale creates a large bitmap that exceeds browser canvas or memory limits. | Reduce scale, crop to the required region, or lower output dimensions. Browser canvas limits vary, so there is no single safe maximum for every browser and device. |
| Tiles fail when an API key or referrer is involved | The provider validates the request origin, token, or referrer policy. | Check the provider’s browser integration instructions and configure Leaflet’s referrerPolicy only as that provider requires; do not expose a secret key in client code. |
When to use a proxy or a different renderer
If the chosen tile provider does not grant browser-readable CORS access, a same-origin proxy can fetch tiles and return them under your origin, but use it only when your provider’s terms permit that delivery pattern. A proxy adds server work, latency, and responsibility for access controls; avoid creating an unrestricted endpoint that anyone can use to fetch arbitrary URLs. Alternatively, choose a tile source whose policy and CORS behavior fit the export use case.
If the requirement is a literal browser-rendered screenshot rather than a reconstructed DOM image, or the page includes content html2canvas cannot reproduce, use a browser-based screenshot approach or server-side renderer instead. The right choice depends on whether you need the live browser’s actual painted result, pixel-readable tiles, reliable automation, or simply a client-side export of supported map DOM.
Or skip the browser setup
For a server-side screenshot of a rendered map page, ScreenshotNeo provides a website screenshot API. It is not a replacement for the Leaflet CORS rules when you are exporting a client-side canvas; it is an alternative when you want a rendered page capture without wiring html2canvas into the browser. One GET request can return PNG, JPEG, WebP, or PDF. See the ScreenshotNeo site and API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpReplace the example URL with a publicly accessible page containing your map and supply your API key. ScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, failed loads, and cache hits are not billed. Its MCP server offers take_screenshot, get_page_info, and capture_pdf tools for AI agents. The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots.
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Frequently Asked Questions
Can I save a Leaflet map as JPEG or WebP with html2canvas?
Yes. Convert the canvas with canvas.toDataURL('image/jpeg') or canvas.toDataURL('image/webp') in browsers that support the requested format, and use a matching filename extension.
Does html2canvas capture map attribution automatically?
It renders eligible DOM content inside the selected element, so visible attribution may appear in the image. Check the tile provider’s terms and ensure attribution remains legible and present in any exported or redistributed image.
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