Delete all your Reddit comments at once

// Responsive Muse · Delete All Reddit Comments · v1.0 · 2026-10-22
// Deletes your Reddit comments, newest first: all of them, the latest LIMIT, or only those in
// some subreddits. Runs only on your comments page on old.reddit.com, whose pages stay the same
// for years. It asks before changing anything, then clicks the same "delete" and "yes" links you
// would, at a human pace, in a hidden frame of the same site. It makes no network requests of
// its own and never reads cookies, passwords or tokens.
(async () => {
  const TOOL = 'Delete Reddit comments';
  const LIMIT = 0;             // only the latest this many comments (0 = all)
  const SUBREDDITS = [];       // only in these subreddits, e.g. ['pics', 'AskReddit'] (empty = everywhere)
  const DELAY = 2000;          // pause between deletions, in milliseconds. Reddit limits fast actions.

  if (location.hostname !== 'old.reddit.com' || !/^\/user\/[^/]+\/comments/.test(location.pathname)) {
    alert('Open your comments on old Reddit first (signed in):\nhttps://old.reddit.com/user/me/comments/');
    return;
  }
  // Must be your own list: old Reddit shows the signed-in user in the header
  const me = (document.querySelector('#header .user a[href*="/user/"]')?.textContent || '').trim();
  const owner = (location.pathname.split('/')[2] || '').toLowerCase();
  if (owner !== me.toLowerCase()) {
    alert(me
      ? `This isn't your own list. Open:\nhttps://old.reddit.com/user/${me}/comments/`
      : 'Sign in on old.reddit.com first, then open your own comments list.');
    return;
  }
  // A small box on the page shows progress and asks before changing anything,
  // so you never need to read or edit the console.
  const many = (n, word) => `${n} ${word}${n === 1 ? '' : 's'}`;   // 1 video, 2 videos
  const panel = (() => {
    const box = document.createElement('div');
    box.style.cssText = 'position:fixed;right:16px;bottom:16px;z-index:2147483647;width:340px;max-width:calc(100vw - 32px);' +
      'background:#111318;color:#e6e8ee;font:14px/1.5 system-ui,sans-serif;border-radius:12px;padding:16px;' +
      'box-shadow:0 8px 30px rgba(0,0,0,.4);text-align:left';
    const head = document.createElement('strong');
    head.textContent = TOOL;
    const msg = document.createElement('p');
    msg.style.cssText = 'margin:8px 0 12px;white-space:pre-line';
    const row = document.createElement('div');
    row.style.cssText = 'display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end';
    box.append(head, msg, row);
    document.body.append(box);
    const button = (label, primary, onClick) => {
      const b = document.createElement('button');
      b.textContent = label;
      b.style.cssText = 'font:600 14px system-ui,sans-serif;padding:8px 14px;border-radius:8px;cursor:pointer;' +
        (primary ? 'background:#0f766e;color:#fff;border:1px solid #0f766e' : 'background:none;color:#e6e8ee;border:1px solid #3a3f4b');
      b.onclick = onClick;
      row.append(b);
    };
    return {
      text(t) { msg.textContent = t; },
      ask(t, yes) {
        msg.textContent = t;
        row.replaceChildren();
        return new Promise(r => {
          button('Cancel', false, () => { row.replaceChildren(); r(false); });
          button(yes, true, () => { row.replaceChildren(); r(true); });
        });
      },
      stoppable(onStop) { row.replaceChildren(); button('Stop', false, onStop); },
      actions(t, list) {
        msg.textContent = t;
        row.replaceChildren();
        list.forEach(([label, primary, run]) => button(label, primary, run));
      },
      finish(t) { this.actions(t, [['Close', true, () => box.remove()]]); },
      close() { box.remove(); },
    };
  })();
  const sleep = ms => new Promise(r => setTimeout(r, ms));
  const only = new Set(SUBREDDITS.map(s => s.replace(/^\/?r\//i, '').toLowerCase()));
  if (!document.querySelector('.thing.comment form.del-button')) {
    alert('This doesn\'t look like your own comments page (there are no "delete" links). Sign in and open:\nhttps://old.reddit.com/user/me/comments/');
    return;
  }

  // 1. Ask (the total isn't known until the end: Reddit shows 25 per page)
  const where = only.size ? ` in ${[...only].map(s => 'r/' + s).join(', ')}` : '';
  const scope = LIMIT ? `your latest ${LIMIT} comments${where}` : `all your comments${where}, newest first`;
  if (!await panel.ask(`Delete ${scope}?\nThis can't be undone. You can stop at any time.`, LIMIT ? `Delete ${LIMIT}` : 'Delete all')) {
    panel.finish('Cancelled. Nothing was changed.');
    return 0;
  }

  // Each page of comments opens in a hidden frame of the same site; it stays open while we click
  let frame = null;
  const openPage = path => new Promise(resolve => {
    frame?.remove();
    frame = document.createElement('iframe');
    frame.style.cssText = 'position:absolute;left:-9999px;width:1000px;height:800px';
    const timer = setTimeout(() => resolve(null), 30000);
    frame.onload = () => { clearTimeout(timer); resolve(frame.contentDocument); };
    frame.src = new URL(path, location.origin).href;
    document.body.appendChild(frame);
  });

  // 2. Delete page by page. Deleted comments leave the list, so the first page is reloaded
  //    until nothing on it is left to delete; then the script moves on to the next page.
  let stop = false;
  panel.stoppable(() => { stop = true; });
  const done = new Set();
  const start = location.pathname + location.search;
  let path = start, count = 0, skipped = 0;
  while (!stop && !(LIMIT && count >= LIMIT)) {
    const doc = await openPage(path);
    if (!doc) break;
    let deletedHere = 0;
    for (const t of doc.querySelectorAll('#siteTable > .thing.comment[data-fullname]')) {
      if (stop || (LIMIT && count >= LIMIT)) break;
      const id = t.dataset.fullname;
      if (done.has(id)) continue;
      done.add(id);
      if (only.size && !only.has((t.dataset.subreddit || '').toLowerCase())) { skipped++; continue; }
      const form = t.querySelector('form.del-button');
      if (!form) continue;
      form.querySelector('a.togglebutton').click();   // "delete"
      await sleep(300);
      form.querySelector('a.yes').click();             // "are you sure? yes"
      count++;
      deletedHere++;
      panel.text(`Deleting… ${count}${LIMIT ? ` of ${LIMIT}` : ''}${skipped ? ` (${skipped} kept in other subreddits)` : ''}`);
      await sleep(DELAY);
    }
    if (deletedHere) { path = start; continue; }     // fresh look at the first page
    const next = doc.querySelector('.next-button a')?.getAttribute('href');
    if (!next) break;
    path = next;
    await sleep(1000);
  }
  frame?.remove();
  if (!count && !stop) {
    panel.finish(only.size ? 'No comments to delete in those subreddits.' : 'You have no comments to delete.');
    return 0;
  }
  panel.finish(`${stop ? 'Stopped' : 'Done'}: deleted ${many(count, 'comment')}.\nReload the page to see the result.`);
  return count;
})();