diff --git a/mapper/src/App.js b/mapper/src/App.js
index 3898220..7857ebe 100644
--- a/mapper/src/App.js
+++ b/mapper/src/App.js
@@ -37,12 +37,12 @@ const parseSlider = (end, duration, slider) => {
 	return [lowStr, highStr];
 };
 
-//async function sha256(source) {
-//	const sourceBytes = new TextEncoder().encode(source);
-//	const digest = await crypto.subtle.digest('SHA-26', sourceBytes);
-//	const resultBytes = [...new Uint8Array(digest)];
-//	return resultBytes.map(x => x.toString(16).padStart(2, '0')).join('');
-//}
+async function sha256(source) {
+	const sourceBytes = new TextEncoder().encode(source);
+	const digest = await crypto.subtle.digest('SHA-256', sourceBytes);
+	const resultBytes = [...new Uint8Array(digest)];
+	return resultBytes.map(x => x.toString(16).padStart(2, '0')).join('');
+}
 
 function useSensor(measurement, name, end, duration) {
 	const [data, setData] = useState(false);
@@ -52,8 +52,19 @@ function useSensor(measurement, name, end, duration) {
 		const get = async() => {
 			setLoading(true);
 			try {
-				const api_key = localStorage.getItem('api_key', 'null');
+				const api_key = localStorage.getItem('api_key');
+				const urlParams = new URLSearchParams(window.location.search);
+				const shareStart = urlParams.get('shareStart');
+				const shareEnd = urlParams.get('shareEnd');
+				const shareSig = urlParams.get('shareSig');
 				const params = { end: end.unix(), duration: duration.len.toLowerCase(), window: duration.win, api_key: api_key };
+
+				if (shareStart && shareEnd && shareSig) {
+					params.shareStart = shareStart;
+					params.shareEnd = shareEnd;
+					params.shareSig = shareSig;
+				}
+
 				const res = await axios.get(
 					'https://sensors-api.dns.t0.vc/history/'+measurement+'/'+name,
 					{ params: params },
@@ -321,6 +332,36 @@ function Menu({duration, setDuration, end, setEnd, slider, setSlider, submenu, s
 
 	const range = parseSlider(end, duration, slider);
 
+	const shareRange = async () => {
+		const shareStart = moment(range[0]).unix();
+		const shareEnd = moment(range[1]).unix();
+		const apiKey = localStorage.getItem('api_key');
+
+		if (!apiKey) {
+			alert('API key is not set. Cannot create a shareable link.');
+			return;
+		}
+
+		const dataToSign = `${shareStart}-${shareEnd}-${apiKey}`;
+		const shareSig = await sha256(dataToSign);
+
+		const params = new URLSearchParams(window.location.search);
+		params.set('shareStart', shareStart);
+		params.set('shareEnd', shareEnd);
+		params.set('shareSig', shareSig);
+
+		const shareUrl = `${window.location.origin}${window.location.pathname}?${params.toString()}`;
+
+		try {
+			await navigator.clipboard.writeText(shareUrl);
+			alert('Shareable URL copied to clipboard!');
+		} catch (err) {
+			console.error('Failed to copy: ', err);
+			alert('Failed to copy URL to clipboard.');
+		}
+		setSubmenu(false);
+	};
+
 	const rangeTime = (x) => {
 		if (new Date().getTimezoneOffset()) {  // non-librewolf browser
 			return moment(x).format('lll');  // default to browser's TZ
@@ -439,6 +480,7 @@ function Menu({duration, setDuration, end, setEnd, slider, setSlider, submenu, s
 								/>
 								Show direction
 							</label>
+							<button onClick={shareRange}>Share range</button>
 							<button onClick={resetToDefaults}>Reset to defaults</button>
 						</>
 					}