Ankidroid Not Syncing | Fix Sync In 10 Minutes

When AnkiDroid won’t sync, it feels like your study time is stuck on one device. Cards you made on your laptop don’t show up on your phone. Reviews you did on your phone don’t reach your computer. Most sync failures still follow a few repeatable patterns, and each one has a direct fix.

This article starts with fast checks, then moves into deeper fixes. You’ll learn what syncing changes, what it leaves alone, and how to get back safely when AnkiDroid asks for a full sync.

What Syncing Does In AnkiDroid

Syncing in AnkiDroid works through AnkiWeb. Your devices send changes to AnkiWeb, then pull down changes made elsewhere. You trigger the process from a device app, not from the AnkiWeb page itself, so the website won’t “push” updates on its own.

Most days, syncing is a merge. New notes, edits, and review history combine across devices. A few change types can’t merge cleanly. When that happens, Anki switches to a one-way sync and asks you to pick which side to keep.

• Understand What Sync Moves — Notes, decks, scheduling data, and review history sync across devices when you use the same AnkiWeb account.
• Expect Media To Lag — Audio and images can take longer than card data, especially after a big import.
• Know Why You See A Choice — Note-type and template changes can trigger a one-way sync prompt.
• Don’t Share One Account Across Profiles — Separate Anki profiles should not sync to the same AnkiWeb account, since it can overwrite changes.

Media syncing plays by its own rules. Card data can be forced one way, yet media changes are merged. If you delete media before a device finishes syncing, the files can come back on the next sync because AnkiWeb still has them. If you edited an existing sound file in place, Anki may not notice that change. Rename the file or replace it so the client treats it as a real update, then sync again.

If you sync between phone and computer, use a simple routine. Sync on the first device, sync on the second device, then sync on the first device again. That last round catches changes that were uploaded after your second device started.

Fast Checks When AnkiDroid Won’t Sync

Start here. These checks catch the cases where the sync path is blocked, not your collection.

• Try A Different Connection — Switch from Wi-Fi to mobile data, or try another Wi-Fi network, to rule out routing trouble.
• Open AnkiWeb In A Browser — If the site won’t load, syncing will fail too. Wait a bit and retry.
• Check Date And Time — Set your phone to automatic date and time so TLS handshakes don’t fail due to a clock mismatch.
• Let One Sync Finish — Leave the app open until the sync ends on its own, then run one more sync right after.

Ankidroid Not Syncing With AnkiWeb Accounts

If the sync button runs but nothing changes on your other devices, start with the account. The most common cause is signing into different AnkiWeb accounts across devices, often after switching emails or resetting a password.

On AnkiDroid, open Settings and find the AnkiWeb account area. Confirm the email matches your desktop account. If you changed your AnkiWeb password, log out on AnkiDroid and sign in again so the stored credential is fresh.

• Verify The Account Email — Check the email shown in AnkiDroid settings and compare it to the account used on your computer.
• Log Out Then Log In — Signing in again can clear a stale login state.
• Check Auto Sync Timing — Auto sync on open and close may not run more than once every ten minutes, so tap sync manually while testing.
• Use One Profile Per Account — Give each Anki profile its own AnkiWeb account so collections don’t overwrite each other.

If you haven’t synced or visited AnkiWeb for months, your stored data on AnkiWeb may be cleared under its inactive-data policy. Your phone or computer copy can still be fine. Pick the device that has your real collection, then sync that device to AnkiWeb again.

If the phrase ankidroid not syncing keeps coming up only when you check AnkiWeb, run a tiny test. Add one test note on desktop, sync, then sync AnkiDroid and check for it. Then add one test note on AnkiDroid and repeat in reverse.

Fixing AnkiDroid Sync Issues On Android Phones

Android can block background network work, especially with battery-saver modes. AnkiDroid can still open decks, yet the sync request stalls or times out. The fix is usually changing one setting, then running a fresh sync while the phone stays awake.

• Disable Battery Restrictions For AnkiDroid — In Android battery settings, allow AnkiDroid to run without aggressive limits, then retry syncing.
• Allow Background Data — In app data settings, allow background data and unrestricted data use if your phone offers that switch.
• Turn Off Data Saver — Data saver can block transfers, which can stall media syncing.
• Free Storage Space — Leave a buffer of free space so media downloads don’t fail mid-stream.
• Restart The Phone — A reboot clears stuck network services and file locks that can trigger repeat timeouts.

If AnkiDroid reports database trouble, use the built-in tools before you reinstall anything. On the deck list screen, open the menu and run the database check, then try syncing again. If you see missing audio, run the media check too. AnkiDroid’s automatic backups save cards and review history, yet they don’t store sounds or images. If you are about to do a one-way sync and you rely on media, export a deck package with media from a device that has it.

If media is the part that won’t finish, check the AnkiDroid setting that controls fetching media on sync. If it’s off, your cards can sync while audio and images stay missing. Turn it on, then sync again and let it run.

Handle 403, TLS, And Login Errors Without Guessing

Error codes usually point to one of three things: a blocked connection, a rejected login, or a server-side outage. Match the message to the action list below, then retry on a clean network.

Sometimes nothing is wrong on your phone. AnkiWeb outages do happen, and they can look like a TLS error or a generic network failure. When AnkiWeb won’t load in a browser, stop changing settings. Wait, then retry later on the same network. When the site loads again, a normal sync often works on the first try.

• Switch Networks After A TLS Error — TLS handshake errors can show up during outages or on networks with filtering. Try mobile data or a different Wi-Fi.
• Disable VPN Or Proxy — VPNs and proxies can trigger blocks or break certificate checks, so turn them off during sync.
• Confirm Your Phone Clock — A wrong clock can cause certificate validation to fail. Set date and time to automatic.
• Pause After Many Wrong Logins — Too many retries can trigger a temporary block. Wait, then try once with the correct password.
• Update AnkiDroid — Running a current build reduces odd bugs that are already fixed.

If AnkiDroid says the collection synced but media fails with a 403-style message, treat it as a media path issue, not a card data issue. First, confirm AnkiWeb loads in your phone browser on the same network. Next, turn off VPN and retry. If it still fails, switching networks often clears it.

Full Sync Without Losing Your Work

A full sync is the “replace one side” option. It’s useful when one device has the right collection and the other side is wrong, out of date, or damaged. It’s risky when you have new cards or reviews on both sides, since only one side’s changes survive the overwrite.

If you see a prompt to upload or download, pause and decide which device has the collection you want to keep. Then back up that device before you proceed.

1. Pick Your Source Device — Decide whether your phone or your computer has the correct, up-to-date collection.
2. Create A Backup First — Save a backup on that source device so you can roll back if you tap the wrong choice.
3. Run Check Database — If AnkiDroid offers a database check in its tools, run it to fix inconsistencies before syncing.
4. Force A One-Way Sync — In AnkiDroid settings under advanced options, use the force full sync option so the next sync lets you choose which side to keep.
5. Sync Other Devices Afterward — After the overwrite, sync each other device and choose the matching direction so everything ends up aligned.

After a one-way sync, run the two-round routine again. Sync the device you just synced, sync the next device, then sync the first device once more.

If sync trouble began suddenly right after you edited note types, added fields, or changed card templates, a one-way sync prompt is common. Those edits can’t always merge across devices, so a forced choice is Anki’s way of keeping one clear history.

Keep Sync Running Smoothly After You Fix It

Once everything is in sync again, a few habits help it stay that way. You just want to avoid long gaps where multiple devices change the same collection without syncing.

• Sync Before And After A Study Session — Two quick syncs bookend your reviews and cut down conflict prompts.
• Let Media Finish On New Decks — After importing a deck with audio, leave the app open on a stable network until media work ends.
• Keep One Account Per Person — Sharing one AnkiWeb login across people or profiles can overwrite collections.
• Use Backups As Your Safety Net — AnkiDroid makes automatic backups of your collection, which gives you a rollback option if a sync choice goes wrong.
• Update Desktop And Phone Apps — Keeping both clients current helps prevent odd sync behavior.

If you want a quick weekly check, sync on each device, then open a deck and confirm the due count feels right. If something looks off, stop and sync again before a long review session.

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