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Download media files from 4chan.org with their posted filenames.
// ==UserScript==
// @name 4chan-dl
// @namespace 0000xFFFF
// @version 1.3.2
// @description Download media files from 4chan.org with their posted filenames.
// @author 0000xFFFF
// @license MIT
// @match *://boards.4chan.org/*/thread/*
// @match *://boards.4channel.org/*/thread/*
// @require https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js
// @grant none
// @icon data:image/ico;base64,AAABAAEAEBAAAAEAIAC+AAAAFgAAAIlQTkcNChoKAAAADUlIRFIAAAAQAAAAEAgGAAAAH/P/YQAAAIVJREFUeJxjYMAO/uPARIP/aWeMUTAxBqDYhsMAnK7BUIzNAEIuItoA2rmArDBQOWcoikWSGAP+a50ylcAwBF0jLoPgmrG5hGTNMMAsyELQCyzCrDgTFFhhIpJidM2JBFIlXEMilkBLICJZo8Q3sndAzkaWw2UAA5IEmNa7qCcGwtjkqAYAtUIYeAqEFoUAAAAASUVORK5CYII=
// ==/UserScript==
(function() {
'use strict';
function GM_addStyle(css) {
const style = document.createElement("style");
style.textContent = css;
(document.head || document.documentElement).appendChild(style);
return style;
}
const fcdl_css = `
.fcdl_button_regular {
padding: 12px 18px;
display: flex;
gap: 5px;
background: #2d5016;
color: white;
border: none;
border-radius: 8px;
cursor: pointer;
font-size: 14px;
font-weight: bold;
box-shadow: 0 4px 15px rgba(0,0,0,0.3);
transition: all 0.3s ease;
white-space: nowrap;
}
.fcdl_button_regular:hover {
background: #4a7c21;
transform: translateY(-2px);
box-shadow: 0 6px 20px rgba(0,0,0,0.4);
}
.fcdl_post_button {
padding: 0 0 0 3px;
margin: 0;
background: transparent;
color: white;
border: none;
cursor: pointer;
opacity: 0.6;
float: right;
}
.fcdl_main_container {
display: flex;
margin: 15px 0 15px 0;
gap: 10px;
}
.fcdl_settings_container {
display: flex;
gap: 10px;
justify-content: flex-end;
align-items: center;
}
.fcdl_radio_label {
display: flex;
align-items: center;
gap: 8px;
cursor: pointer;
overflow: hidden;
}
.fcdl_radio_input {
cursor: pointer;
accent-color: rgb(102, 204, 51);
background-color black;
display: none;
}
.fcdl_radio_span {
height: 15px;
width: 15px;
border: 1px solid #555;
border-radius: 50%;
display: inline-block;
position: relative;
cursor: pointer;
}
.fcdl_radio_input:checked + .fcdl_radio_span {
background-color: green;
border-color: #4CAF50;
}
.fcdl_radio_input:checked + .fcdl_radio_span::after {
content: "";
position: absolute;
top: 3px;
left: 3px;
width: 9px;
height: 9px;
background: lime;
border-radius: 100%;
}
.fcdl_progress_container {
padding-left: 15px;
display: flex;
justify-content: flex-end;
align-items: center;
gap: 15px;
font-family: arial, helvetica, sans-serif;
color: white;
font-size: 14px;
}
.fcdl_progress_bar {
width: 200px;
height: 8px;
background: #333;
border-radius: 4px;
overflow: hidden;
}
.fcdl_progress_fill {
height: 100%;
background: linear-gradient(90deg, #4CAF50, #45a049);
width: 0%;
transition: width 0.3s ease;
border-radius: 4px;
}
`;
GM_addStyle(fcdl_css);
const userscript_icon = "data:image/ico;base64,AAABAAEADg8AAAEAIAC4AAAAFgAAAIlQTkcNChoKAAAADUlIRFIAAAAOAAAADwgGAAAA1BT+dAAAAH9JREFUeJxjYMAE/3FgguB/2hljFIxPI4rpODRi2I6hCJtGXC4gWiP1bCTLj2Ro/M+gcs5QFJcGXAZonTKVAFtJjGYMTTDALMhC0KkswqwYCQGsIBFJEbqmRBypCK4wEUtgJOBJfijxhexskPOQ5dA1MiAJgGm9i3piIIxNDgQAf5IV/0loTT0AAAAASUVORK5CYII=";
function loadSetting(name, def) {
const raw = localStorage.getItem(name);
if (raw === null) {
localStorage.setItem(name, JSON.stringify(def));
return def;
}
return JSON.parse(raw);
}
function saveSetting(name, value) {
localStorage.setItem(name, JSON.stringify(value));
}
const config = {
useOriginalNames: loadSetting("useOriginalNames", true),
usePostIds: loadSetting("usePostIds", false),
combineNames: loadSetting("combineNames", false),
maxConcurrentDownloads: loadSetting("maxConcurrentDownloads", 5)
};
function createDownloadButtons() {
const postContainers = document.querySelectorAll(".postContainer");
postContainers.forEach((postContainer, index) => {
const postInfos = postContainer.querySelectorAll(".postInfo");
postInfos.forEach((postInfo, index) => {
const button = document.createElement("button");
button.title = "Download All as ZIP from this post down";
button.className = "fcdl_post_button";
const img = document.createElement("img")
img.src = userscript_icon;
button.appendChild(img);
button.addEventListener('click', function(e) {
e.preventDefault();
downloadAllImagesAsZip(postContainer.id.replace("pc", ""));
});
postInfo.appendChild(button);
});
});
}
function createDownloadButton() {
const button = document.createElement('button');
button.id = "4chan_dl_button";
button.className = "fcdl_button_regular";
const img = document.createElement("img");
img.src = userscript_icon;
button.appendChild(img);
const span = document.createElement("span");
span.innerHTML = "Download All As Zip";
button.appendChild(span);
return button;
}
function createRadioButton({
id,
name,
label,
title,
checked = false,
onChange
}) {
// Create label wrapper
const labelEl = document.createElement("label");
labelEl.className = "fcdl_radio_label";
labelEl.setAttribute("for", id);
labelEl.title = title;
// Create input
const input = document.createElement("input");
input.type = "radio";
input.id = id;
input.name = name;
input.checked = checked;
input.className = "fcdl_radio_input";
input.title = title;
// Hook event listener
if (typeof onChange === "function") {
input.addEventListener("change", () => {
if (input.checked) {
onChange();
}
});
}
// Custom span for styling
const span = document.createElement("span");
span.className = "fcdl_radio_span";
// Visible text
const textNode = document.createTextNode(label);
textNode.title = title;
// Assemble
labelEl.appendChild(input);
labelEl.appendChild(span);
labelEl.appendChild(textNode);
return labelEl;
}
function createSettings() {
const container = document.createElement("div");
container.className = "fcdl_settings_container";
container.appendChild(createRadioButton({
id: "radioOriginalNames",
name: "filenameOption",
label: "Original Names",
title: "Use the original filenames from the posts.",
checked: config.useOriginalNames,
onChange: () => {
saveSetting("useOriginalNames", true);
saveSetting("usePostIds", false);
saveSetting("combineNames", false);
config.useOriginalNames = true;
config.usePostIds = false;
config.combineNames = false;
}
}));
container.appendChild(createRadioButton({
id: "radioPostIds",
name: "filenameOption",
label: "Post IDs",
title: "Use post IDs as filenames.",
checked: config.usePostIds,
onChange: () => {
saveSetting("useOriginalNames", false);
saveSetting("usePostIds", true);
saveSetting("combineNames", false);
config.useOriginalNames = false;
config.usePostIds = true;
config.combineNames = false;
}
}));
container.appendChild(createRadioButton({
id: "radioCombineNames",
name: "filenameOption",
label: "Combine",
title: "Combine post IDs and original filenames. ({id}_{postname}.ext)",
checked: config.combineNames,
onChange: () => {
saveSetting("useOriginalNames", false);
saveSetting("usePostIds", false);
saveSetting("combineNames", true);
config.useOriginalNames = false;
config.usePostIds = false;
config.combineNames = true;
}
}));
return container;
}
function createProgressIndicator() {
document.querySelectorAll(".fcdl_progress_container").forEach((item, index) => { item.remove(); } );
const progressContainer = document.createElement('div');
progressContainer.className = "fcdl_progress_container";
const bodyColor = getComputedStyle(document.body).color;
const progressText = document.createElement('div');
progressText.id = 'zip-progress-text';
progressText.textContent = 'Preparing download...';
progressText.style.color = bodyColor;
const progressBar = document.createElement('div');
progressBar.className = "fcdl_progress_bar";
const progressFill = document.createElement('div');
progressFill.id = 'zip-progress-fill';
progressFill.className = "fcdl_progress_fill";
const progressPercent = document.createElement('div');
progressPercent.id = 'zip-progress-percent';
progressPercent.textContent = '0%';
progressPercent.style.color = bodyColor;
progressContainer.appendChild(progressPercent);
progressBar.appendChild(progressFill);
progressContainer.appendChild(progressBar);
progressContainer.appendChild(progressText);
return progressContainer;
}
function postFileTextToMediaLink(fileText, index) {
const link = fileText.querySelector('a');
if (link && link.href) {
const url = link.href.startsWith('//') ? 'https:' + link.href : link.href;
const isImage = /\.(jpg|jpeg|png|gif|webp|bmp|svg)(\?|$)/i.test(url);
const isVideo = /\.(mp4|webm|mkv|avi|mov)(\?|$)/i.test(url);
if (isImage || isVideo) {
const postId = url.split('/').pop().split('?')[0];
let originalName = link.title.trim() || link.textContent.trim() || postId;
// if 4chan-X is used fix the name fetching
const fnfull = link.querySelector('.fnfull');
if (fnfull) { originalName = fnfull.textContent.trim(); }
return {
url: url,
originalName: originalName,
postId: postId,
index: index + 1
};
}
}
return null;
}
function findMediaLinks(startFromThisPostId = "") {
const mediaLinks = [];
if (startFromThisPostId != "") {
let found = false;
const fileTexts = document.querySelectorAll('div.fileText');
fileTexts.forEach((fileText, index) => {
if (fileText.id.replace("fT", "") == startFromThisPostId) { found = true; }
if (found) {
const mediaLink = postFileTextToMediaLink(fileText, index);
if (mediaLink != null) {
mediaLinks.push(mediaLink);
}
}
});
}
else {
const fileTexts = document.querySelectorAll('div.fileText');
fileTexts.forEach((fileText, index) => {
const mediaLink = postFileTextToMediaLink(fileText, index);
if (mediaLink != null) {
mediaLinks.push(mediaLink);
}
});
}
return mediaLinks;
}
function findMediaLinksFromImgAndVideoElements() {
const mediaLinks = [];
const imgElements = document.querySelectorAll('img[src*="jpg"], img[src*="jpeg"], img[src*="png"], img[src*="gif"], img[src*="webp"], img[src*="bmp"]');
const videoElements = document.querySelectorAll('video[src*="mp4"], video[src*="webm"], video[src*="mkv"], video[src*="avi"], video[src*="mov"]');
const mediaElements = [...imgElements, ...videoElements];
mediaElements.forEach((img_or_vid, index) => {
const url = img_or_vid.src;
const filename = url.split('/').pop().split('?')[0];
mediaLinks.push({
url: url,
originalName: filename,
postId: filename,
index: index + 1
});
});
return mediaLinks;
}
function generateFilename(imageData) {
let filename;
if (config.usePostIds) {
filename = imageData.postId;
} else if (config.combineNames) {
const postIdBase = imageData.postId.split('.')[0];
filename = `${postIdBase}_${imageData.originalName}`;
} else {
filename = imageData.originalName;
}
filename = filename.replace(/[<>:"/\\|?*]/g, '_');
return filename;
}
function updateProgress(current, total, status = '', filename = '') {
const progressText = document.getElementById('zip-progress-text');
const progressFill = document.getElementById('zip-progress-fill');
const progressPercent = document.getElementById('zip-progress-percent');
if (progressText && progressFill && progressPercent) {
const percentage = Math.round((current / total) * 100);
let displayText = status;
if (filename) {
displayText += ` - ${filename}`;
}
if (current <= total) {
displayText = `${status} (${current}/${total})` + (filename ? ` - ${filename}` : '');
}
progressText.textContent = displayText;
progressFill.style.width = `${percentage}%`;
progressPercent.textContent = `${percentage}%`;
}
}
async function downloadAllImagesAsZip(startFromThisPostId = "") {
const imageLinks = findMediaLinks(startFromThisPostId);
if (imageLinks.length === 0) {
alert('No images found on this page!\n\nMake sure your page has images in div.fileText elements or direct img tags.');
return;
}
const container = document.getElementById("4chan_dl_cont");
const progressIndicator = createProgressIndicator();
container.appendChild(progressIndicator);
progressIndicator.style.display = 'flex';
console.log(`Found ${imageLinks.length} images to download`);
const zip = new JSZip();
const downloadedFilenames = new Set();
let completed = 0;
let successful = 0;
updateProgress(0, imageLinks.length, 'Initializing', '');
const downloadImage = async (imageData) => {
let filename = generateFilename(imageData);
let counter = 1;
const originalFilename = filename;
while (downloadedFilenames.has(filename)) {
const dotIndex = originalFilename.lastIndexOf('.');
if (dotIndex > 0) {
const name = originalFilename.substring(0, dotIndex);
const ext = originalFilename.substring(dotIndex);
filename = `${name}_${counter}${ext}`;
} else {
filename = `${originalFilename}_${counter}`;
}
counter++;
}
downloadedFilenames.add(filename);
try {
updateProgress(completed + 1, imageLinks.length, 'Downloading', filename);
const response = await fetch(imageData.url);
if (!response.ok) {
throw new Error(`HTTP ${response.status} - ${response.statusText}`);
}
const blob = await response.blob();
zip.file(filename, blob);
successful++;
console.log(`✓ Added to ZIP: ${filename}`);
return { success: true, filename };
} catch (error) {
console.error(`✗ Failed to download ${imageData.url}:`, error);
return { success: false, filename, error: error.message };
} finally {
completed++;
updateProgress(completed, imageLinks.length, 'Downloading', filename);
}
};
const processDownloads = async () => {
const promises = [];
for (const imageData of imageLinks) {
promises.push(downloadImage(imageData));
if (promises.length >= config.maxConcurrentDownloads) {
await Promise.all(promises.splice(0, config.maxConcurrentDownloads));
}
}
if (promises.length > 0) {
await Promise.all(promises);
}
};
try {
await processDownloads();
completed = imageLinks.length;
updateProgress(completed, imageLinks.length, 'Creating ZIP file', '');
const zipBlob = await zip.generateAsync({
type: "blob",
compression: "DEFLATE",
compressionOptions: {
level: 6
}
});
const now = new Date();
const timestamp = now.toISOString().slice(0, 19).replace(/:/g, '-');
const pageTitle = document.title.replace(/[<>:"/\\|?*]/g, '_').slice(0, 50);
const zipFilename = `${pageTitle || 'images'}_${timestamp}.zip`;
updateProgress(completed, imageLinks.length, 'Downloading ZIP', zipFilename);
const downloadLink = document.createElement('a');
downloadLink.href = URL.createObjectURL(zipBlob);
downloadLink.download = zipFilename;
downloadLink.style.display = 'none';
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
setTimeout(() => URL.revokeObjectURL(downloadLink.href), 5000);
setTimeout(() => {
//progressIndicator.style.display = 'none';
//container.removeChild(progressIndicator);
const sizeInMB = (zipBlob.size / (1024 * 1024)).toFixed(2);
const message = `✅ ZIP Download Complete!\n\n` +
`📁 File: ${zipFilename}\n` +
`📊 Total images: ${imageLinks.length}\n` +
`✅ Successful: ${successful}\n` +
`❌ Failed: ${imageLinks.length - successful}\n` +
`💾 ZIP size: ${sizeInMB} MB`;
alert(message);
console.log(message);
}, 1000);
} catch (error) {
console.error('Error creating ZIP:', error);
progressIndicator.style.display = 'none';
document.body.removeChild(progressIndicator);
alert(`❌ Error creating ZIP file:\n${error.message}`);
}
}
async function init() {
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
return;
}
setTimeout(async () => {
try {
const containerDiv = document.createElement('div');
containerDiv.id = "4chan_dl_cont";
containerDiv.className = "fcdl_main_container";
const settingsContainer = createSettings();
const downloadButton = createDownloadButton();
downloadButton.addEventListener('click', function(e) {
e.preventDefault();
downloadAllImagesAsZip();
});
containerDiv.appendChild(downloadButton);
containerDiv.appendChild(settingsContainer);
const threadElement = document.querySelector(".thread");
threadElement.parentElement.insertBefore(containerDiv, threadElement);
const mediaLinks = findMediaLinks();
console.log(`Found ${mediaLinks.length} media files on page:`, mediaLinks);
document.getElementById("4chan_dl_button").title = `Download All (${mediaLinks.length}) as ZIP`;
createDownloadButtons();
} catch (error) {
console.error('Error initializing userscript:', error);
}
}, 500);
}
init();
})();