What it reads, what it stores

As of November 2026

ManhwaSync is a browser extension that keeps track of the chapters you read. This page says what it looks at, what it keeps and who else sees any of it.

On the pages you open

The extension runs on every site, because it can’t know in advance where you read. On each page it checks the address, and that check stays in your browser. Only an address that looks like a chapter, or belongs to a supported site, goes any further.

On those pages it reads the series title and the chapter number, from the address or from the page’s own title text. It doesn’t read what you type on a page, and it doesn’t read your browsing history.

Workplace mode, if you turn it on, deletes chapter addresses from your browser history. Deleting them is the only thing the extension ever does with your history.

Without an account

Your library, your progress and your settings stay in your browser, and uninstalling removes them. Looking up a series sends its title to ManhwaSync’s server, which asks MangaUpdates. The search term and its results are kept in a short-lived cache, with nothing about who searched.

With an account

An account is optional. It’s what syncs your library between devices and makes friends possible. With one, ManhwaSync’s server stores:

your username, your email if you give one, and your password as a salted hash, never in plain text;
your avatar, if you upload one;
your library: the series, your chapter, the link to where you read, your own titles, the order and your chapter alerts;
a private reading log: how far you got in each series each day, for your recaps;
your recaps: every January and July a summary of the past year or half-year is saved from that log and kept until you delete your account;
your friends, friend requests and notifications;
your invite code, and who invited whom: an invite makes the two of you friends, and a new reader who starts reading counts for the inviter’s Word of Mouth achievement;
whether your profile is public (it starts private);
in the reading log too: the hour of the day you read in, the day you catch up with the newest chapter of a series (or finish one that has ended), and your reading time, the seconds a chapter page is in front while you scroll, click or type, added up per series and day. Achievements use these right away, your recaps from 1 January 2027 on. Background tabs and pages left open while you’re away don’t count, nothing outside chapter pages is timed, and Settings → “Count reading time” turns reading time off;
the device and browser name of each signed-in session, so you can review them;
when you use your library on this website: a website session. One the extension hands out lasts an hour; one you start with your password lasts 30 days if you choose “Keep me signed in”, otherwise 12 hours, and notes the device and browser name. A website session can show and change your library, alerts, friends and profile. It can also manage your account, but your username, email and password are changed, and the account deleted, only after you enter your current password again;
what you write in a bug report or feature request, and the replies.

Signing in keeps a random session token in the extension’s storage in your browser. It doesn’t expire on its own: signing out ends that session, and changing your password ends all the others.

Who sees it

Other people can find you by your username to send a friend request. Friends you’ve accepted see what you read last and can open your library. Anyone with your invite link sees your username and avatar and can become your friend with it, so share it with people you know; a new link ends the old one. If you make your profile public, anyone with its link sees your username, your avatar and the series you’re reading, have caught up on and have completed, with your chapter in each; never your reading log or your friends. Turning it off makes it private again at once. Friends never see your reading log; their recaps only compare how many chapters you each read in that period. Your recap says where you stand among all readers (“top 6%”) without naming anyone. A recap image leaves your computer only if you post it yourself. Nothing is sold, and there are no ads.

The services it uses

Your data goes to these services only, and only so that ManhwaSync works:

Convex runs the server and the database behind accounts and search.
MangaUpdates is the catalogue. It gets search terms from the server, nothing about you. Cover images load straight from it, so it sees an ordinary image request from your browser.
Sentry receives crash reports: the stack trace and the name of what failed. Error messages, account details and request data are removed before they’re sent.

What it never collects

No payment details, no location and no IP addresses, no messages, and nothing from the pages you read beyond the series title and chapter number. It doesn’t record keystrokes or mouse movements: for reading time it only notes whether you’re active on a chapter page, never what you do there.

This website

No cookies, no analytics, and nothing loaded from other sites: the fonts are served from here too. Your browser’s local storage remembers your theme and language and, if you sign in here with your password, that session. When you open an invite link, it keeps the invite code until the extension takes it or you accept the invite on the page, so the invite still works after you install the extension. Like any web server, the one that hosts this site logs requests, including your IP address, to keep it running and safe.

Public profiles and the web app on this website load from ManhwaSync’s server, and their covers from MangaUpdates. The web app shows your library, notifications, friends and profile, and what you change there is saved to your account like a change made in the extension. It does not track what you read; only the extension does.

The web app’s Account page shows your username, your email and the devices and browsers your account is signed in on, in the extension and on this website. There you can change your username, add, change or remove your email, set a new password, sign a session out, or delete your account with everything in it. A new username, email or password and deleting the account each ask for your current password, which is sent to ManhwaSync’s server to be checked; wrong attempts are limited. A new password signs every other session out.

You sign in to the web app in one of two ways. Where the extension is installed, the page asks it and gets a session of its own that lasts an hour and ends the moment you sign out of the extension; the page keeps it in memory, never in storage, and never sees the extension’s own sign-in. Anywhere else, such as on a phone, you sign in with your username and password, or make an account right there: a username, a password and, if you like, an email, stored exactly as when you register in the extension. The password is sent to ManhwaSync’s server to be checked and is not kept by the page. The session it starts stays in your browser’s local storage for 30 days if you choose “Keep me signed in”, and otherwise only until you close the tab, 12 hours at most. Sign-in attempts and new accounts are limited.

Settings → “Sign in on the website” turns the automatic sign-in off, and “Devices & sessions”, in the extension’s Settings and on the web app’s Account page, lists the website sessions so you can end them. Changing your password ends them too.

What you can do

Remove any series from your library at any time.
Download your whole library as a JSON backup in Settings.
Sign out your devices one by one or all at once in Settings.
Delete your account on the Profile screen: the account goes at once, everything stored with it shortly after.
Uninstall the extension, which deletes everything stored in your browser.
Write to liokonrad77@gmail.com with any question about your data.

When this page changes

Changes are posted here, and the date at the top changes with them.