ChatGPT Conversation Exporter (Improved Browser Console Script only) — export all your conversations as JSON + Markdown + ZIP.

README.md

ChatGPT Conversation Exporter

Export all your ChatGPT conversations as JSON + Markdown + HTML + ZIP. Works with ChatGPT Business/Team/Enterprise accounts (including SSO/Okta).

What's exported

• JSON — Raw conversation data from the API
• Markdown — Clean text with headers per message, relative links to downloaded files
• HTML — ChatGPT-style conversation viewer with sidebar navigation, syntax-highlighted code blocks, and embedded images
• Files — All images (DALL-E, uploads), documents, and code interpreter outputs are downloaded alongside conversations

Option 1: Browser Console (easiest, works for everyone)

1. Go to chatgpt.com and log in
2. Open the browser console: Cmd+Option+J (Chrome) or Cmd+Option+K (Firefox)
3. Copy-paste the contents of export-chatgpt-console.js and press Enter
4. A progress overlay appears → ZIP file downloads automatically

This runs directly in your browser — no Cloudflare issues, no token copy-paste.

Option 2: Shell Script (terminal)

Please refer to original gist here: https://gist.github.com/ocombe/1d7604bd29a91ceb716304ef8b5aa4b5

Troubleshooting

Problem	Solution
Token expired	Tokens are short-lived. Re-open the session URL and copy again
Console version: no overlay appears	Make sure you're on chatgpt.com (not another site)
Some files failed to download	File download URLs can expire. Re-run the export if needed
HTML pages look unstyled	HTML files need internet access (once) to load marked.js and highlight.js from CDN

export-chatgpt-console.js

// ── ChatGPT Conversation Exporter ────────────────────────────────────
// Paste this into your browser console while on chatgpt.com
// It will export all conversations as JSON + Markdown + HTML in a ZIP file.
// ─────────────────────────────────────────────────────────────────────

(async () => {
  const API = "/backend-api";
  const PAGE_SIZE = 100;
  const DELAY = 10000;
  const DEVICE_ID = crypto.randomUUID();


  const HEADERS = {
    "Content-Type": "application/json",
    Accept: "application/json",
    "Oai-Device-Id": DEVICE_ID,
    "Oai-Language": "en-US",
  };

  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

  // ── UI overlay ──────────────────────────────────────────────────────

  const overlay = document.createElement("div");
  overlay.id = "chatgpt-exporter-overlay";
  overlay.innerHTML = `
    <div style="position:fixed;inset:0;background:rgba(0,0,0,0.7);z-index:99999;
      display:flex;align-items:center;justify-content:center;font-family:-apple-system,BlinkMacSystemFont,sans-serif">
      <div style="background:#1e293b;border-radius:16px;padding:40px;max-width:500px;width:90%;color:#e2e8f0;box-shadow:0 25px 50px rgba(0,0,0,0.4)">
        <h2 style="margin:0 0 8px;font-size:20px;color:#f8fafc">ChatGPT Exporter</h2>
        <p id="cge-status" style="color:#94a3b8;font-size:14px;margin:0 0 20px">Starting...</p>
        <div style="width:100%;height:8px;background:#334155;border-radius:4px;overflow:hidden;margin-bottom:8px">
          <div id="cge-bar" style="height:100%;background:#3b82f6;border-radius:4px;transition:width 0.3s;width:0%"></div>
        </div>
        <p id="cge-detail" style="color:#64748b;font-size:13px;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis"></p>
      </div>
    </div>`;
  document.body.appendChild(overlay);

  const ui = {
    status: overlay.querySelector("#cge-status"),
    bar: overlay.querySelector("#cge-bar"),
    detail: overlay.querySelector("#cge-detail"),
    set(status, pct, detail) {
      if (status) this.status.textContent = status;
      if (pct != null) this.bar.style.width = pct + "%";
      if (detail) this.detail.textContent = detail;
    },
    done(msg) {
      this.status.textContent = msg;
      this.bar.style.width = "100%";
      this.bar.style.background = "#22c55e";
      this.detail.textContent = "You can close this overlay by clicking anywhere.";
      overlay.querySelector("div").style.cursor = "pointer";
      overlay.addEventListener("click", () => overlay.remove());
    },
    error(msg) {
      this.status.textContent = msg;
      this.bar.style.background = "#ef4444";
      this.detail.textContent = "Click anywhere to close.";
      overlay.addEventListener("click", () => overlay.remove());
    },
  };

  // ── Get token ───────────────────────────────────────────────────────

  ui.set("Getting session token...");
  let token;
  try {
    const session = await fetch("/api/auth/session").then((r) => r.json());
    token = session.accessToken;
    if (!token) throw new Error("No accessToken in session");
  } catch (e) {
    ui.error("Failed to get session token. Are you logged in?");
    return;
  }

  // ── API helper ──────────────────────────────────────────────────────

  async function apiGet(path) {
    const resp = await fetch(`${API}/${path}`, {
      headers: { ...HEADERS, Authorization: `Bearer ${token}` },
    });
    if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
    return resp.json();
  }

  async function apiFetchBinary(url) {
    const resp = await fetch(url);
    if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
    const data = new Uint8Array(await resp.arrayBuffer());
    const contentType = resp.headers.get("content-type") || "";
    return { data, contentType };
  }

  const MIME_TO_EXT = {
    "image/png": ".png", "image/jpeg": ".jpg", "image/gif": ".gif",
    "image/webp": ".webp", "image/svg+xml": ".svg", "application/pdf": ".pdf",
    "text/plain": ".txt", "text/html": ".html", "text/csv": ".csv",
    "application/json": ".json", "application/zip": ".zip",
    "application/vnd.openxmlformats-officedocument.wordprocessingml.document": ".docx",
    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet": ".xlsx",
  };

  // ── File references ─────────────────────────────────────────────────

  function extractFileReferences(convo) {
    const refs = [];
    const seen = new Set();
    const mapping = convo.mapping || {};

    for (const node of Object.values(mapping)) {
      const msg = node.message;
      if (!msg) continue;

      if (msg.content?.parts) {
        for (const part of msg.content.parts) {
          if (part?.content_type === "image_asset_pointer" && part.asset_pointer) {
            const match = part.asset_pointer.match(/^(?:file-service|sediment):\/\/(.+)$/);
            if (match && !seen.has(match[1])) {
              seen.add(match[1]);
              refs.push({
                fileId: match[1],
                filename: part.metadata?.dalle?.prompt ? "dalle_image.png" : "image.png",
                type: "image",
              });
            }
          }
        }
      }

      if (msg.metadata?.attachments) {
        for (const att of msg.metadata.attachments) {
          if (att.id && !seen.has(att.id)) {
            seen.add(att.id);
            refs.push({ fileId: att.id, filename: att.name || "attachment", type: "attachment" });
          }
        }
      }

      if (msg.metadata?.citations) {
        for (const cit of msg.metadata.citations) {
          const fileId = cit.metadata?.file_id || cit.file_id;
          const title = cit.metadata?.title || cit.title || "citation";
          if (fileId && !seen.has(fileId)) {
            seen.add(fileId);
            refs.push({ fileId, filename: title, type: "citation" });
          }
        }
      }
    }
    return refs;
  }

  async function downloadFile(fileId, fallbackName) {
    const meta = await apiGet(`files/download/${fileId}`);
    if (!meta.download_url) throw new Error("No download_url");
    const { data, contentType } = await apiFetchBinary(meta.download_url);
    let filename = meta.file_name || fallbackName || fileId;
    // Add extension from content-type if missing
    if (!filename.includes(".") && contentType) {
      const mime = contentType.split(";")[0].trim();
      const ext = MIME_TO_EXT[mime];
      if (ext) filename += ext;
    }
    return { filename, data };
  }

  function deduplicateFilename(name, usedNames) {
    if (!usedNames.has(name)) { usedNames.add(name); return name; }
    const dot = name.lastIndexOf(".");
    const base = dot > 0 ? name.slice(0, dot) : name;
    const ext = dot > 0 ? name.slice(dot) : "";
    let i = 1;
    while (usedNames.has(`${base}_${i}${ext}`)) i++;
    const deduped = `${base}_${i}${ext}`;
    usedNames.add(deduped);
    return deduped;
  }

  function sanitize(name) {
    return name.replace(/[<>:"/\\|?*]/g, "_").replace(/^[. ]+|[. ]+$/g, "").slice(0, 80) || "untitled";
  }

  function stripCitations(str) {
    return str.replace(/\u3010[^\u3011]*\u3011/g, "");
  }

  function escapeHtml(str) {
    return str.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
  }

  // ── Fetch conversation list ─────────────────────────────────────────

  ui.set("Fetching conversation list...");
  let offset = 0;
  let conversations = [];
  try {
    while (true) {
      const data = await apiGet(`conversations?offset=${offset}&limit=${PAGE_SIZE}`);
      const items = data.items || [];
      if (!items.length) break;
      conversations.push(...items);
      const total = data.total || conversations.length;
      ui.set(`Fetching conversation list... ${conversations.length}/${total}`);
      offset += PAGE_SIZE;
      if (offset >= total) break;
      await sleep(DELAY);
    }
  } catch (e) {
    ui.error(`Failed to fetch conversations: ${e.message}`);
    return;
  }

  if (!conversations.length) {
    ui.done("No conversations found.");
    return;
  }

  ui.set(`Found ${conversations.length} conversations. Downloading...`);

  // ── Pass 1: Download conversations + files ──────────────────────────

  
  let failed = 0;
  let totalFiles = 0;
  let failedFiles = 0;
  const failedConvoList = [];
  const retries = 20;
  const total = conversations.length;
  
    
  // batch management
  const batchsize = 200;
  const batchnum = Math.ceil(total / batchsize)
  
  
// start batch logic here

  const zipEntries = [];
  let delayCatch = DELAY;
  let tries = 0;
  const downloaded = []; // { fname, title, convo, fileMap }
  
  
    for (let offset = 0; offset < batchnum; offset++){
        
      for (let i = 0 + offset; i < total; i = i + batchnum) {
        const { id: cid, title: rawTitle } = conversations[i];
        const title = rawTitle || "Untitled";
        const fname = `${sanitize(title)}_${cid.slice(0, 8)}`;
        const pct = Math.round(((i + 1) / total) * 100);

        ui.set(`Downloading ${i + 1} of ${total} (${pct}%)`, pct, title);

        try {
          const convo = await apiGet(`conversation/${cid}`);
          const jsonStr = JSON.stringify(convo, null, 2);

          // Extract and download file references
          const fileRefs = extractFileReferences(convo);
          const fileMap = {};
          const usedNames = new Set();

          for (const ref of fileRefs) {
            totalFiles++;
            try {
              const { filename: dlName, data } = await downloadFile(ref.fileId, ref.filename);
              const actualName = deduplicateFilename(dlName || ref.filename, usedNames);
              zipEntries.push({ path: `files/${fname}/${actualName}`, data });
              fileMap[ref.fileId] = `../files/${fname}/${actualName}`;
              await sleep(DELAY);
            } catch {
              failedFiles++;
            }
          }

          const mdStr = toMarkdown(convo, fileMap);
          zipEntries.push({ path: `json/${fname}.json`, data: jsonStr });
          zipEntries.push({ path: `markdown/${fname}.md`, data: mdStr });

          downloaded.push({ fname, title, convo, fileMap });
          tries = 0;
          delayCatch = DELAY;
          console.log("Success.")
        } catch {
          
          tries++;
          if (tries < retries) {
            console.log("failed, retrying with delay: "+ delayCatch);
            await sleep(delayCatch);
            delayCatch = delayCatch + DELAY;
            i--;
          } else {
            failed++;
            tries = 0;
            delayCatch = DELAY;
            failedConvoList.push({ cid, title });
            console.log("Given up. Proceeding to next.");
          }
        }

        await sleep(DELAY);
      }
      console.log("Failed downloads: " + failed);
      failedConvoList.forEach(function(entry) {
        console.log(entry.cid + " || " + entry.title);
      });

      // ── Pass 2: Generate HTML with sidebar ──────────────────────────────

      ui.set("Generating HTML pages...", 100);
      const allConvos = downloaded.map((d) => ({ fname: d.fname, title: d.title }));

      for (const d of downloaded) {
        const htmlStr = toHtml(d.convo, d.fileMap, allConvos, d.fname);
        zipEntries.push({ path: `html/${d.fname}.html`, data: htmlStr });
      }

      // ── Build ZIP and download ──────────────────────────────────────────

      ui.set("Creating ZIP archive...", 100);

      const zipBlob = buildZipBlob(zipEntries);
      const a = document.createElement("a");
      a.href = URL.createObjectURL(zipBlob);
      a.download = "chatgpt-export.zip";
      a.click();
      URL.revokeObjectURL(a.href);
      
      let batchMsg = `Batch of $(batchnum)`;
      console.log("Batch " + offset + " of " + batchnum);

    // end loop here
    }
  const succeeded = total - failed;
  let doneMsg = `Done! Exported ${succeeded}/${total} conversations.`;
  if (failed) doneMsg += ` (${failed} failed)`;
  if (totalFiles) doneMsg += ` ${totalFiles - failedFiles}/${totalFiles} files downloaded.`;
  ui.done(doneMsg);
  

  // ── Markdown converter ──────────────────────────────────────────────

  function toMarkdown(convo, fileMap = {}) {
    const title = convo.title || "Untitled";
    const ct = convo.create_time;
    let dateStr = "";
    if (ct) dateStr = new Date(ct * 1000).toISOString().replace("T", " ").slice(0, 16) + " UTC";

    const lines = [`# ${title}`, ""];
    if (dateStr) lines.push(`*${dateStr}*\n`);

    const mapping = convo.mapping || {};
    const rootId = Object.keys(mapping).find((k) => mapping[k].parent == null);

    if (rootId) {
      const queue = [rootId];
      while (queue.length) {
        const nid = queue.shift();
        const node = mapping[nid] || {};
        const msg = node.message;
        if (msg?.content?.parts) {
          const role = msg.author?.role || "unknown";
          // Skip system, tool, and non-text assistant messages from markdown
          if (role === "system" || role === "tool") { queue.push(...(node.children || [])); continue; }
          const contentType = msg.content?.content_type || "text";
          if (role === "assistant" && contentType !== "text") { queue.push(...(node.children || [])); continue; }
          const textParts = [];

          for (const part of msg.content.parts) {
            if (typeof part === "string") {
              textParts.push(part);
            } else if (part?.content_type === "image_asset_pointer" && part.asset_pointer) {
              const match = part.asset_pointer.match(/^(?:file-service|sediment):\/\/(.+)$/);
              if (match && fileMap[match[1]]) {
                textParts.push(`![image](${fileMap[match[1]]})`);
              } else {
                textParts.push("[image]");
              }
            } else {
              textParts.push(JSON.stringify(part));
            }
          }

          if (msg.metadata?.attachments) {
            for (const att of msg.metadata.attachments) {
              if (att.id && fileMap[att.id]) {
                textParts.push(`\n📎 [${att.name || "attachment"}](${fileMap[att.id]})`);
              }
            }
          }

          const text = stripCitations(textParts.join("\n")).trim();
          if (text) {
            lines.push(`## ${role.charAt(0).toUpperCase() + role.slice(1)}\n\n${text}\n`);
          }
        }
        queue.push(...(node.children || []));
      }
    }

    return lines.join("\n");
  }

  // ── HTML converter ──────────────────────────────────────────────────

  function toHtml(convo, fileMap = {}, allConversations = [], currentFname = "") {
    const title = escapeHtml(convo.title || "Untitled");
    const ct = convo.create_time;
    let dateStr = "";
    if (ct) dateStr = new Date(ct * 1000).toISOString().replace("T", " ").slice(0, 16) + " UTC";

    const messages = [];
    const mapping = convo.mapping || {};
    const rootId = Object.keys(mapping).find((k) => mapping[k].parent == null);

    if (rootId) {
      const queue = [rootId];
      while (queue.length) {
        const nid = queue.shift();
        const node = mapping[nid] || {};
        const msg = node.message;
        if (msg?.content?.parts) {
          const role = msg.author?.role || "unknown";
          const contentType = msg.content?.content_type || "text";
          if (role === "system") { queue.push(...(node.children || [])); continue; }

          const isInternal = role === "tool" ||
            (role === "assistant" && contentType !== "text") ||
            (role === "user" && contentType === "user_editable_context");

          const textParts = [];
          const imageParts = [];

          for (const part of msg.content.parts) {
            if (typeof part === "string") {
              textParts.push(part);
            } else if (part?.content_type === "image_asset_pointer" && part.asset_pointer) {
              const match = part.asset_pointer.match(/^(?:file-service|sediment):\/\/(.+)$/);
              if (match && fileMap[match[1]]) imageParts.push(fileMap[match[1]]);
            }
          }

          const attachments = [];
          if (msg.metadata?.attachments) {
            for (const att of msg.metadata.attachments) {
              if (att.id && fileMap[att.id]) {
                attachments.push({ name: att.name || "attachment", path: fileMap[att.id] });
              }
            }
          }

          const text = stripCitations(textParts.join("\n")).trim();
          if (text || imageParts.length || attachments.length) {
            messages.push({ role, text, images: imageParts, attachments, isInternal, contentType });
          }
        }
        queue.push(...(node.children || []));
      }
    }

    const LOGO = '<svg viewBox="0 0 41 41" fill="none" xmlns="http://www.w3.org/2000/svg" width="24" height="24"><path d="M37.532 16.87a9.963 9.963 0 0 0-.856-8.184 10.078 10.078 0 0 0-10.855-4.835A9.964 9.964 0 0 0 18.306.5a10.079 10.079 0 0 0-9.614 6.977 9.967 9.967 0 0 0-6.664 4.834 10.08 10.08 0 0 0 1.24 11.817 9.965 9.965 0 0 0 .856 8.185 10.079 10.079 0 0 0 10.855 4.835 9.965 9.965 0 0 0 7.516 3.35 10.078 10.078 0 0 0 9.617-6.981 9.967 9.967 0 0 0 6.663-4.834 10.079 10.079 0 0 0-1.243-11.813ZM22.498 37.886a7.474 7.474 0 0 1-4.799-1.735c.061-.033.168-.091.237-.134l7.964-4.6a1.294 1.294 0 0 0 .655-1.134V19.054l3.366 1.944a.12.12 0 0 1 .066.092v9.299a7.505 7.505 0 0 1-7.49 7.496ZM6.392 31.006a7.471 7.471 0 0 1-.894-5.023c.06.036.162.099.237.141l7.964 4.6a1.297 1.297 0 0 0 1.308 0l9.724-5.614v3.888a.12.12 0 0 1-.048.103l-8.051 4.649a7.504 7.504 0 0 1-10.24-2.744ZM4.297 13.62A7.469 7.469 0 0 1 8.2 10.333c0 .068-.004.19-.004.274v9.201a1.294 1.294 0 0 0 .654 1.132l9.723 5.614-3.366 1.944a.12.12 0 0 1-.114.012L7.044 23.86a7.504 7.504 0 0 1-2.747-10.24Zm27.658 6.437-9.724-5.615 3.367-1.943a.121.121 0 0 1 .114-.012l8.048 4.648a7.498 7.498 0 0 1-1.158 13.528V21.36a1.293 1.293 0 0 0-.647-1.132v-.17Zm3.35-5.043c-.059-.037-.162-.099-.236-.141l-7.965-4.6a1.298 1.298 0 0 0-1.308 0l-9.723 5.614v-3.888a.12.12 0 0 1 .048-.103l8.05-4.645a7.497 7.497 0 0 1 11.135 7.763Zm-21.063 6.929-3.367-1.944a.12.12 0 0 1-.065-.092v-9.299a7.497 7.497 0 0 1 12.293-5.756 6.94 6.94 0 0 0-.236.134l-7.965 4.6a1.294 1.294 0 0 0-.654 1.132l-.006 11.225Zm1.829-3.943 4.33-2.501 4.332 2.5v5l-4.331 2.5-4.331-2.5V18Z" fill="currentColor"/></svg>';

    const INTERNAL_LABELS = {
      multimodal_text: "File context", code: "Code", execution_output: "Output",
      computer_output: "Output", tether_browsing_display: "Web browsing",
      system_error: "Error", text: "Tool output",
    };

    const messagesHtml = messages.map((m) => {
      if (m.isInternal) {
        const label = INTERNAL_LABELS[m.contentType] || "Internal context";
        const b64 = btoa(unescape(encodeURIComponent(m.text)));
        return `<details class="thinking"><summary>${label}</summary><div class="thinking-content md-content" dir="auto" data-md="${b64}"></div></details>`;
      }

      const roleClass = m.role === "user" ? "user" : "assistant";
      let content = "";

      if (m.role === "user") {
        content = `<div class="bubble" dir="auto">${escapeHtml(m.text).replace(/\n/g, "<br>")}</div>`;
      } else {
        const b64 = btoa(unescape(encodeURIComponent(m.text)));
        content = `<div class="avatar">${LOGO}</div><div class="content"><div class="md-content" dir="auto" data-md="${b64}"></div></div>`;
      }

      if (m.images.length) {
        content += `<div class="images">${m.images.map((s) => `<a href="${escapeHtml(s)}" target="_blank"><img src="${escapeHtml(s)}" alt="image" loading="lazy"></a>`).join("")}</div>`;
      }
      if (m.attachments.length) {
        content += `<div class="attachments">${m.attachments.map((a) => `<a class="attachment" href="${escapeHtml(a.path)}" target="_blank"><span class="att-icon">📎</span><span class="att-name">${escapeHtml(a.name)}</span></a>`).join("")}</div>`;
      }

      return `<div class="message ${roleClass}">${content}</div>`;
    }).join("\n");

    const sidebarItems = allConversations.map((c) => {
      const cls = c.fname === currentFname ? "sidebar-item active" : "sidebar-item";
      return `<a class="${cls}" href="${c.fname}.html" title="${escapeHtml(c.title)}">${escapeHtml(c.title)}</a>`;
    }).join("\n");

    return `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>${title}</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release/build/styles/github-dark.min.css">
<style>
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    background: #ffffff; color: #0d0d0d;
    line-height: 1.65; font-size: 16px;
    display: flex; height: 100vh;
  }
  .sidebar {
    width: 260px; min-width: 260px; height: 100vh;
    background: #f9f9f9; border-right: 1px solid #e5e5e5;
    overflow-y: auto; padding: 16px 0;
    flex-shrink: 0; position: sticky; top: 0;
  }
  .sidebar-header {
    padding: 8px 16px 16px; font-size: 14px; font-weight: 600;
    color: #6b6b6b; border-bottom: 1px solid #e5e5e5; margin-bottom: 8px;
  }
  .sidebar-item {
    display: block; padding: 8px 16px; font-size: 13px;
    color: #0d0d0d; text-decoration: none;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    border-radius: 8px; margin: 2px 8px;
  }
  .sidebar-item:hover { background: #ececec; }
  .sidebar-item.active { background: #e5e5e5; font-weight: 600; }
  .sidebar-toggle {
    display: none; position: fixed; top: 12px; left: 12px; z-index: 100;
    background: #f4f4f4; border: 1px solid #e5e5e5; border-radius: 8px;
    width: 36px; height: 36px; cursor: pointer;
    align-items: center; justify-content: center; font-size: 20px;
  }
  @media (max-width: 768px) {
    .sidebar {
      position: fixed; left: -280px; z-index: 99;
      transition: left 0.2s; box-shadow: 2px 0 8px rgba(0,0,0,0.1);
    }
    .sidebar.open { left: 0; }
    .sidebar-toggle { display: flex; }
    .main { margin-left: 0 !important; }
  }
  .main { flex: 1; overflow-y: auto; }
  .header {
    max-width: 768px; margin: 0 auto; padding: 32px 24px 16px;
    border-bottom: 1px solid #e5e5e5;
  }
  .header h1 { font-size: 22px; font-weight: 600; }
  .header .date { font-size: 13px; color: #6b6b6b; margin-top: 4px; }
  .chat { max-width: 768px; margin: 0 auto; padding: 24px; }
  .message { margin-bottom: 24px; }
  .message.user { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
  .message.user .bubble {
    background: #f4f4f4; border-radius: 18px; padding: 10px 16px;
    max-width: 85%; white-space: pre-wrap; word-break: break-word;
  }
  .message.user .images { width: 100%; display: flex; justify-content: flex-end; }
  .message.assistant { display: flex; gap: 12px; align-items: flex-start; }
  .message.assistant .avatar {
    width: 28px; height: 28px; border-radius: 50%;
    background: #00a67e; color: #fff;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; margin-top: 2px;
  }
  .message.assistant .content { flex: 1; min-width: 0; }
  .message.assistant .content h1,
  .message.assistant .content h2,
  .message.assistant .content h3 { margin: 16px 0 8px; font-weight: 600; }
  .message.assistant .content h1 { font-size: 20px; }
  .message.assistant .content h2 { font-size: 18px; }
  .message.assistant .content h3 { font-size: 16px; }
  .message.assistant .content p { margin: 8px 0; }
  .message.assistant .content ul,
  .message.assistant .content ol { margin: 8px 0; padding-left: 24px; }
  .message.assistant .content li { margin: 4px 0; }
  .message.assistant .content a { color: #1a7f64; }
  .message.assistant .content code {
    background: #f0f0f0; border-radius: 4px; padding: 2px 5px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 14px;
  }
  .message.assistant .content pre { margin: 12px 0; border-radius: 8px; overflow: hidden; }
  .message.assistant .content pre code {
    display: block; background: #0d0d0d; color: #f8f8f2;
    padding: 16px; overflow-x: auto; border-radius: 0;
    font-size: 13px; line-height: 1.5;
  }
  .code-block { position: relative; }
  .code-block .copy-btn {
    position: absolute; top: 8px; right: 8px;
    background: #333; border: none; color: #999; cursor: pointer;
    font-size: 12px; padding: 4px 10px; border-radius: 4px;
    opacity: 0; transition: opacity 0.2s;
  }
  .code-block:hover .copy-btn { opacity: 1; }
  .code-block .copy-btn:hover { color: #fff; background: #555; }
  .images img { max-width: 100%; border-radius: 8px; margin: 4px 0; display: block; cursor: pointer; }
  .images img:hover { opacity: 0.9; }
  .message.user .images img { max-width: 300px; }
  .attachments { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px; }
  .attachment {
    display: inline-flex; align-items: center; gap: 8px;
    background: #f4f4f4; border: 1px solid #e5e5e5; border-radius: 8px;
    padding: 8px 12px; text-decoration: none; color: #0d0d0d; font-size: 14px;
  }
  .attachment:hover { background: #ececec; }
  .att-icon { font-size: 16px; }
  .att-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 200px; }

  .thinking {
    margin-bottom: 24px; border-left: 3px solid #d4d4d4;
    padding-left: 16px; font-size: 14px;
  }
  .thinking summary {
    color: #8e8e8e; font-style: italic; cursor: pointer;
    padding: 4px 0; user-select: none;
  }
  .thinking summary:hover { color: #555; }
  .thinking-content {
    color: #6b6b6b; padding: 8px 0; font-style: italic;
  }
  .thinking-content p, .thinking-content li { color: #6b6b6b; }
  .thinking-content pre code { opacity: 0.7; }
  .thinking-content h1, .thinking-content h2, .thinking-content h3 {
    color: #6b6b6b; font-size: 15px;
  }
</style>
</head>
<body>
<button class="sidebar-toggle" onclick="document.querySelector('.sidebar').classList.toggle('open')">&#9776;</button>
<nav class="sidebar">
  <div class="sidebar-header">Conversations</div>
  ${sidebarItems}
</nav>
<div class="main">
  <div class="header">
    <h1>${title}</h1>
    ${dateStr ? `<div class="date">${dateStr}</div>` : ""}
  </div>
  <div class="chat">
  ${messagesHtml}
  </div>
</div>
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"><\/script>
<script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release/build/highlight.min.js"><\/script>
<script>
document.addEventListener('DOMContentLoaded', () => {
  marked.setOptions({
    highlight: (code, lang) => {
      if (lang && hljs.getLanguage(lang)) {
        return hljs.highlight(code, { language: lang }).value;
      }
      return hljs.highlightAuto(code).value;
    },
    breaks: true,
  });

  const renderer = new marked.Renderer();
  renderer.code = function({ text, lang }) {
    const highlighted = lang && hljs.getLanguage(lang)
      ? hljs.highlight(text, { language: lang }).value
      : hljs.highlightAuto(text).value;
    return '<div class="code-block"><button class="copy-btn" onclick="navigator.clipboard.writeText(this.nextElementSibling.querySelector(\\'code\\').textContent);this.textContent=\\'Copied!\\';setTimeout(()=>this.textContent=\\'Copy\\',1500)">Copy</button>'
      + '<pre><code class="hljs">' + highlighted + '</code></pre></div>';
  };
  marked.use({ renderer });

  document.querySelectorAll('.md-content').forEach(el => {
    const md = decodeURIComponent(escape(atob(el.dataset.md)));
    el.innerHTML = marked.parse(md);
  });

  const active = document.querySelector('.sidebar-item.active');
  if (active) active.scrollIntoView({ block: 'center', behavior: 'instant' });
});
<\/script>
</body>
</html>`;
  }

  // ── Minimal ZIP builder (store, no compression) ─────────────────────

  function buildZipBlob(entries) {
    const te = new TextEncoder();
    const parts = [];
    const cdParts = [];
    let offset = 0;

    for (const entry of entries) {
      const pathBytes = te.encode(entry.path);
      const dataBytes = typeof entry.data === "string" ? te.encode(entry.data) : entry.data;
      const crc = crc32(dataBytes);

      // Local file header (30 bytes)
      const lh = new DataView(new ArrayBuffer(30));
      lh.setUint32(0, 0x04034b50, true);
      lh.setUint16(4, 20, true);
      lh.setUint16(8, 0, true); // store
      lh.setUint32(14, crc, true);
      lh.setUint32(18, dataBytes.length, true);
      lh.setUint32(22, dataBytes.length, true);
      lh.setUint16(26, pathBytes.length, true);

      parts.push(new Uint8Array(lh.buffer), pathBytes, dataBytes);

      // Central directory entry (46 bytes)
      const cd = new DataView(new ArrayBuffer(46));
      cd.setUint32(0, 0x02014b50, true);
      cd.setUint16(4, 20, true);
      cd.setUint16(6, 20, true);
      cd.setUint16(10, 0, true); // store
      cd.setUint32(16, crc, true);
      cd.setUint32(20, dataBytes.length, true);
      cd.setUint32(24, dataBytes.length, true);
      cd.setUint16(28, pathBytes.length, true);
      cd.setUint32(42, offset, true);

      cdParts.push(new Uint8Array(cd.buffer), pathBytes);

      offset += 30 + pathBytes.length + dataBytes.length;
    }

    const cdSize = cdParts.reduce((s, p) => s + p.length, 0);

    // End of central directory (22 bytes)
    const eocd = new DataView(new ArrayBuffer(22));
    eocd.setUint32(0, 0x06054b50, true);
    eocd.setUint16(8, entries.length, true);
    eocd.setUint16(10, entries.length, true);
    eocd.setUint32(12, cdSize, true);
    eocd.setUint32(16, offset, true);

    return new Blob([...parts, ...cdParts, new Uint8Array(eocd.buffer)], {
      type: "application/zip",
    });
  }

  function crc32(buf) {
    const table = new Uint32Array(256);
    for (let i = 0; i < 256; i++) {
      let c = i;
      for (let j = 0; j < 8; j++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
      table[i] = c;
    }
    let crc = 0xffffffff;
    for (let i = 0; i < buf.length; i++) crc = table[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
    return (crc ^ 0xffffffff) >>> 0;
  }
})();

Theoretically, it works (no errors downloading conversations in the console), but the final ZIP export fails. The browser crashes at 100%, so I can't save the data. Could we implement a 'one-by-one' ZIP save instead? Would that yield the same result? As it stands, I can't use it. Could you point me to what needs to be changed in the code to achieve this?

Edit: I tried modifying const batchSize = 2; (down from 200), but the result wasn't optimal. Each new ZIP file includes all the data from the previous ones, causing the file size to grow exponentially (e.g., 4MB, 6MB, 10MB, 18MB...). This eventually crashes the browser before the process is even halfway done. It seems the data isn't being cleared from memory between batches.

It seems the data isn't being cleared from memory between batches.

Probably also means I sent my colleague duplicated exports then. Anyways, see if you can "clear" all loop data by resetting all used variables near the end of the loop.

I'm currently at work and it will be a while for me to get back. Just saw your comment.