For X (Twitter) bookmarks
Your X bookmarks, as files on your own disk. Even after we're gone.
A Chrome extension that quietly archives every post you bookmark on X into a folder you pick — as plain text files you can open, search, and carry to any other computer. No account, no upload, no server to shut down.
Be told when it launches
One email on launch day, plus the occasional short update. This is not a newsletter — expect a handful of emails, not a weekly one. The founding price is limited to 100 licences, first come.
Coming to the Chrome Web Store in late September 2026. Unlimited capture and export are free forever; installing starts a 14-day full trial, no card.
0 accounts · 0 bookmarks uploaded · 0 ways for us to read them — verify
If it can’t find Chinese, it can’t find it.
Don’t take that on faith — the box below runs against a sample archive. Type in it. Left is whitespace splitting; right is ours.
An ordinary keyword search
What every other bookmark tool gives you. It looks for the letters you typed, nothing more.
MarkVault
It reads the phrase the way you meant it, then puts the closest match on top.
Sample data; every account here is invented. This panel is a stripped-down version of what ships — the real thing is faster and reads far more than twelve posts. It is here so you can settle the question yourself instead of taking our word for it.
Your archive, on your disk
Every tool in this category says your data is “in your browser” or “on your device.” None of them will show you the file. Here is ours.
# the folder you picked, after your first full collection ~/Archives/MarkVault/ ├── bookmarks-2026-08.jsonl 1,204 lines ├── bookmarks-2026-07.jsonl 2,880 lines ├── bookmarks-2024-03.jsonl 3,517 lines └── manifest.json counts, ranges, integrity check # one archived post = one line. shown wrapped; it is a single line on disk. {"tweet_id":"18…907","author":"@sample_dev","created_at":"2024-03-11T08:22:14Z", "text":"中文搜索做不好，一个库存得再多也是个摆设。","cashtags":[], "folder_ids":["default"],"media":[],"deleted_upstream":false, "archived_at":"2026-08-20T05:41:02Z","raw":{ … }}
The posts you saved are already disappearing.
Authors delete. Accounts get suspended. X caps what it will show you. When that happens, the bookmark stays in your list but the post is gone — and there is no copy anywhere you control.
MarkVault keeps the copy. If the original is deleted, your archive becomes the last one that exists.
How it works
Open your bookmarks and scroll
Everything you scroll past gets archived. A live counter shows the archive filling up, dated backwards through the years.
Choose a data location once
Choose a data folder once during setup. Synced bookmarks keep saving there automatically. Change or reauthorize it under Data location in Settings.
Search it like it’s yours
Because it is. Ask it in your own words, in Chinese or English, and it finds the thing — including anything that has vanished from X since you archived it.
The archive is free, forever. What you pay for is finding things in it.
Unlimited capture and full export are free and always will be. Pro adds the retrieval layer: proper search that actually understands Chinese and runs on your own machine at hundreds of thousands of bookmarks, video saving and automatic media archiving, an overview of what you save, and author aggregation.
Five products in this category are more mature than we are. We wrote a sourced comparison of which one fits you — including where we fall short.
The person who built this
I have been saving things on X since 2018 — a little over thirty-one thousand posts. A while ago I went looking for one of them and got “This Post is from an account that no longer exists.” I counted: twelve of my bookmarks are like that. They are still sitting in my bookmark list, the content is gone from the world, and I do not hold a copy of any of it.
MarkVault is the thing I built about that. It is Chrome only. There is no mobile app, no integrations, and not one user yet — all of which is written down on the comparison page, none of it hidden. I would rather you know that before you give me an email address than after.
The one guarantee I can give: your archive is plain text files on your own disk. The day I stop working on this, you do not need my permission to keep using it.
— nerd bk. Mail to support@markvault.app reaches me, not a helpdesk.
Questions
What happens to my archive if I stop paying?
Nothing. Archiving and export never downgrade — not on trial expiry, not ever. An absent or expired trial only turns off search, video saving and automatic media archiving, the overview page, and MCP access for AI tools. Your data and your export stay open.
Do I need an account?
No. There is no signup, no login and no server holding your data. A licence is a signed key you paste into the extension.
I get a new computer. What happens to my archive?
Before changing computers, open Backup and restore and click Back up. Choose a separate location and wait for the folder copy to complete, then copy that backup folder to the new computer. There, choose Restore from backup and select the copy. Its contents are restored to the browser, which then keeps saving to the selected folder. You can also restore from the original data folder; neither option needs conversion or unpacking.
What if I uninstall the extension, or clear my browser data?
Your data folder and any backup copies you created remain on disk. After reinstalling or clearing browser data, open Backup and restore, choose Restore from backup, and select a backup folder or the original data folder. This browser then keeps saving to the folder you select.
I have several X accounts. What happens when I switch between them in the same browser?
Each account's bookmarks go into the same archive. They never overwrite each other, and syncing one account never marks another account's bookmarks as removed. Your library shows them together; it doesn't split them by account. If you switch accounts mid-collection, that account's progress is kept and resumes automatically when you switch back. Capture and export work with any number of accounts; a personal licence covers search and analysis for up to 3 syncing accounts in one archive, and you can stop syncing any account from Sync accounts in Backup and restore at any time. Daily sync only updates the account you're signed in to on X; another account's new bookmarks are saved when you switch to it.
What happens when I turn on Automatically save images and videos?
MarkVault gradually saves bookmarked images and video cover images to the media folder inside your data location.
What if MarkVault shuts down?
Your archive does not change by a single byte. Activating a code once requires the licence service, but your archive and export never do. There is no proprietary format to be locked out of. The extension keeps running on the version you have, and the files are readable by anything.