Summarize webpage, selected text or YouTube transcript via local API
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// ==UserScript==
// @name GPT4Free Page Summarizer
// @version 1.7.3
// @description Summarize webpage, selected text or YouTube transcript via local API
// @author SH3LL
// @match *://*/*
// @grant GM.xmlHttpRequest
// @run-at document-end
// @namespace http://tampermonkey.net/
// ==/UserScript==
(function () {
'use strict';
// === Globals ===
let loading = false;
let ytTranscript = null;
let isSidebarVisible = false;
let isTextSelected = false;
let hoverTimeout;
const isYouTubeVideoPage = window.location.hostname.includes("youtube.com") && window.location.pathname === "/watch";
const browserLanguage = navigator.language;
const selectedLanguage = getDisplayLanguage(browserLanguage);
const modelProviderPairs = [
{ label: 'DDG / gpt-4o-mini', model: 'gpt-4o-mini', provider: 'DDG' },
{ label: 'Blackbox / DeepSeek-R1', model: 'DeepSeek-V3', provider: 'Blackbox' },
{ label: 'Free2GPT / gemini-1.5-flash', model: 'gemini-1.5-flash', provider: 'Free2GPT' },
{ label: 'PollinationsAI / gpt-4o-mini', model: 'gpt-4o-mini', provider: 'PollinationsAI' }
];
let selectedModel = modelProviderPairs[0].model;
let selectedProvider = modelProviderPairs[0].provider;
// === Init DOM UI ===
const { shadowRoot, sidebar, toggleButton, summarizeButton, statusDisplay, summaryContainer } = createSidebarUI();
document.body.appendChild(shadowRoot.host);
setTimeout(() => {
toggleButton.style.opacity = '0.3';
}, 2000);
// === Start transcript load if on YouTube ===
if (isYouTubeVideoPage) {
loadYouTubeTranscript().then(transcript => {
ytTranscript = transcript;
console.log("YOUTUBE Transcript:", transcript);
updateButtonText();
}).catch(err => {
console.warn("Transcript not found:", err);
ytTranscript = null;
updateButtonText();
// Mostra messaggio arancione nel contenitore dei summary
summaryContainer.style.display = 'block';
summaryContainer.textContent = '⚠️ The video has no subtitles';
summaryContainer.style.color = 'orange';
});
}
// === Add Event Listeners ===
document.addEventListener('mouseup', updateButtonText);
document.addEventListener('mousedown', () => setTimeout(updateButtonText, 100));
toggleButton.addEventListener('click', toggleSidebar);
toggleButton.addEventListener('mouseover', () => {
clearTimeout(hoverTimeout);
toggleButton.style.opacity = '1';
});
toggleButton.addEventListener('mouseout', () => {
hoverTimeout = setTimeout(() => {
if (!isSidebarVisible) toggleButton.style.opacity = '0.3';
}, 3000);
});
summarizeButton.addEventListener('click', handleSummarizeClick);
// === Initial button text ===
updateButtonText();
updateStatusDisplay('Idle', '#888888');
// === Language Utility ===
function getDisplayLanguage(langCode) {
try {
const name = new Intl.DisplayNames([langCode], { type: 'language' }).of(langCode);
return name || langCode;
} catch {
return langCode;
}
}
// === Summarize Request ===
function summarizePage(text, lang) {
return new Promise((resolve, reject) => {
const prompt = `Summarize the following text in ${lang}. The summary is organised in blocks of topics.
Return the result in a json list composed of dictionaries with fields "title" (the title starts with a contextual emoji) and "text".
Don't add any other sentence like "Here is the summary", or coding formatting like \"\`\`\`json\", write directly the summary itself.
Exclude from the summary any advertisement or sponsorization.
Here is the text: ${text}`;
const payload = {
messages: [{ role: 'user', content: prompt }],
model: selectedModel,
provider: selectedProvider
};
GM.xmlHttpRequest({
method: 'POST',
url: 'http://localhost:1337/v1/chat/completions',
headers: { 'Content-Type': 'application/json' },
data: JSON.stringify(payload),
onload: response => {
const color = (response.status >= 200 && response.status < 300) ? '#00ff00' : '#ffcc00';
console.log(response.responseText);
resolve({ status: response.status, responseText: response.responseText, color });
},
onerror: err => reject({ message: 'Network error', color: '#ff4444' })
});
});
}
// === YouTube Transcript Extraction ===
function loadYouTubeTranscript() {
return new Promise((resolve, reject) => {
const TRANSCRIPT_ID = "engagement-panel-searchable-transcript";
const SELECTOR = `ytd-engagement-panel-section-list-renderer[target-id="${TRANSCRIPT_ID}"] #content`;
const panelObserver = new MutationObserver((mutationsList, observerInstance) => {
const panel = document.querySelector(`ytd-engagement-panel-section-list-renderer[target-id="${TRANSCRIPT_ID}"]`);
if (panel) {
observerInstance.disconnect();
panel.setAttribute("visibility", "ENGAGEMENT_PANEL_VISIBILITY_EXPANDED");
const content = panel.querySelector('#content');
if (content) {
observeTranscriptContent(content, panel);
} else {
reject("Contenuto non trovato nel pannello.");
}
}
});
panelObserver.observe(document.body, { childList: true, subtree: true });
function observeTranscriptContent(content, panel) {
const contentObserver = new MutationObserver((mutationsList, observerInstance) => {
const segments = content.querySelectorAll('.segment-text');
if (content.children.length > 0 && segments.length > 0) {
const transcript = Array.from(content.querySelectorAll('.segment-text'))
.map(seg => seg.textContent.trim())
.join(" ");
observerInstance.disconnect();
panel.setAttribute("visibility", "ENGAGEMENT_PANEL_VISIBILITY_HIDDEN");
resolve(transcript.trim());
}
});
contentObserver.observe(content, { childList: true, subtree: true });
setTimeout(() => {
contentObserver.disconnect();
reject("Timeout: Trascrizione non trovata.");
}, 10000);
}
setTimeout(() => {
panelObserver.disconnect();
reject("Timeout: Pannello di trascrizione non trovato.");
}, 10000);
});
}
// === Sidebar Toggle ===
function toggleSidebar() {
isSidebarVisible = !isSidebarVisible;
sidebar.style.right = isSidebarVisible ? '0' : '-300px';
toggleButton.style.right = isSidebarVisible ? '300px' : '0';
setTimeout(() => {
toggleButton.style.opacity = isSidebarVisible ? '1' : '0.3';
}, 1000);
}
// === UI Updates ===
function updateButtonText() {
if (loading) {
summarizeButton.textContent = 'Loading..';
return;
}
const selectedText = window.getSelection().toString();
if (selectedText) {
summarizeButton.textContent = `Summary [${selectedText.substring(0, 2).trim()}..]`;
isTextSelected = true;
} else if (isYouTubeVideoPage) {
if (ytTranscript && ytTranscript.trim().length > 0) {
summarizeButton.textContent = 'Summary 📹️';
} else {
summarizeButton.textContent = 'Summary';
}
isTextSelected = false;
} else {
summarizeButton.textContent = 'Summary';
isTextSelected = false;
}
}
function updateStatusDisplay(text, color) {
while (statusDisplay.firstChild) {
statusDisplay.removeChild(statusDisplay.firstChild);
}
const statusLabel = document.createElement('span');
statusLabel.textContent = 'Status: ';
const statusText = document.createElement('span');
statusText.textContent = text;
statusText.style.color = color;
const langLabel = document.createElement('span');
langLabel.textContent = ' | Lang: ';
const langText = document.createElement('span');
langText.textContent = selectedLanguage;
langText.style.color = '#00bfff';
statusDisplay.appendChild(statusLabel);
statusDisplay.appendChild(statusText);
statusDisplay.appendChild(langLabel);
statusDisplay.appendChild(langText);
}
function craftJson(jsonData) {
const container = document.createElement('div');
JSON.parse(jsonData).forEach(block => {
const title = document.createElement('strong');
title.textContent = block.title;
const text = document.createElement('div');
text.textContent = block.text;
container.appendChild(title);
container.appendChild(text);
container.appendChild(document.createElement('br'));
});
return container;
}
function handleSummarizeClick() {
if (loading) return;
updateButtonText();
updateStatusDisplay('Requesting..', '#888888');
summaryContainer.style.display = 'none';
let content = '';
if (isYouTubeVideoPage && ytTranscript && isTextSelected!=true) {
content = ytTranscript;
} else if (isTextSelected) {
content = window.getSelection().toString();
} else {
content = document.body.innerText;
}
loading = true;
summarizeButton.disabled = true;
summarizePage(content, selectedLanguage)
.then(({ status, responseText, color }) => {
try {
const json = JSON.parse(responseText);
const result = json.choices?.[0]?.message?.content || 'Invalid API response format.';
summaryContainer.append(craftJson(result));
summaryContainer.style.color = '#ffffff';
updateStatusDisplay(`Success (${status})`, color);
} catch (err) {
summaryContainer.textContent = `Error parsing response: ${err}`;
summaryContainer.style.color = '#ff4444';
updateStatusDisplay(`Failed (${status})`, '#ff4444');
}
})
.catch(err => {
summaryContainer.textContent = `Error: ${err.message}`;
summaryContainer.style.color = '#ff4444';
updateStatusDisplay('Failed', err.color);
})
.finally(() => {
loading = false;
summarizeButton.disabled = false;
updateButtonText();
summaryContainer.style.display = 'block';
});
}
// === UI Construction ===
function createSidebarUI() {
const host = document.createElement('div');
const root = host.attachShadow({ mode: 'open' });
const sidebar = document.createElement('div');
Object.assign(sidebar.style, {
position: 'fixed',
right: '-300px',
top: '0',
width: '300px',
height: '100vh',
backgroundColor: '#000',
color: '#fff',
padding: '20px',
zIndex: '999999',
fontFamily: 'Arial, sans-serif',
display: 'flex',
flexDirection: 'column',
gap: '10px',
boxSizing: 'border-box',
transition: 'right 0.3s ease',
borderLeft: '1px solid #cccccc',
borderTopLeftRadius: '5px',
borderBottomLeftRadius: '5px'
});
const toggleBtn = document.createElement('button');
Object.assign(toggleBtn.style, {
position: 'fixed',
right: '0',
top: '20px',
backgroundColor: '#333',
color: '#000',
border: '1px solid #cccccc',
borderRadius: '6px',
padding: '10px',
cursor: 'pointer',
zIndex: '1000000',
fontSize: '14px',
transition: 'right 0.3s ease, opacity 0.3s ease'
});
toggleBtn.textContent = '✨';
const container = document.createElement('div');
Object.assign(container.style, {
display: 'flex',
gap: '10px',
alignItems: 'center'
});
const modelSelect = document.createElement('select');
modelSelect.style.padding = '6px';
modelSelect.style.fontSize = '14px';
modelSelect.style.borderRadius = '4px';
modelSelect.style.border = '1px solid #ccc';
modelSelect.style.backgroundColor = '#222';
modelSelect.style.color = '#fff';
modelProviderPairs.forEach((pair, index) => {
const option = document.createElement('option');
option.value = index;
option.textContent = pair.label;
modelSelect.appendChild(option);
});
modelSelect.addEventListener('change', (e) => {
const selected = modelProviderPairs[e.target.value];
selectedModel = selected.model;
selectedProvider = selected.provider;
});
const summarizeBtn = document.createElement('button');
Object.assign(summarizeBtn.style, {
backgroundColor: '#333',
color: '#fff',
border: '1px solid #cccccc',
borderRadius: '6px',
padding: '10px 20px',
cursor: 'pointer',
fontSize: '14px',
flex: '1',
transition: 'background-color 0.3s'
});
summarizeBtn.onmouseover = () => summarizeBtn.style.backgroundColor = '#4d4d4d';
summarizeBtn.onmouseout = () => summarizeBtn.style.backgroundColor = '#333';
const status = document.createElement('div');
status.style.fontSize = '12px';
const summary = document.createElement('div');
Object.assign(summary.style, {
fontSize: '14px',
lineHeight: '1.5',
display: 'none',
overflowY: 'auto',
maxHeight: 'calc(100vh - 130px)',
whiteSpace: 'pre-line'
});
container.appendChild(summarizeBtn);
sidebar.appendChild(modelSelect);
sidebar.appendChild(container);
sidebar.appendChild(status);
sidebar.appendChild(summary);
root.appendChild(sidebar);
root.appendChild(toggleBtn);
return {
shadowRoot: root,
sidebar,
toggleButton: toggleBtn,
summarizeButton: summarizeBtn,
statusDisplay: status,
summaryContainer: summary
};
}
})();