When you encounter an HTTP Error 404 in Tachiyomi while trying to read manga, it simply means “Not Found.” In the context of the app, this usually indicates that the link Tachiyomi is using to fetch the manga or chapter is broken or no longer valid on the source website.
This is a client-side error (4xx), meaning the error is related to the request the app is making, rather than an issue with the website’s server (which would be a 5xx error). Here is a step-by-step guide to troubleshooting and fixing the HTTP 404 error.
Phase 1: Fixing the Source Link (The Primary Fix)
The most common reason for a 404 error is that the source website changed the URL for the manga or chapter. The extension needs to be updated, or the entry itself needs to be refreshed.
1. Update or Reinstall the Extension
The extension developer likely knows the site changed its links and has released a fix.
- Open the Tachiyomi app and head over to the Browse tab.
- Go to Extensions (using the three dots or top tab).
- Find the source that is giving you the 404 error.
- If there’s an Update available for that source, tap Update.
- If there is no update available, uninstall the extension and then reinstall it. This forces the app to pull the latest working code.
2. Delete and Re-add the Title (Migration)
If the extension is updated but the title still gives an error, the specific entry in your library might be using a corrupted or outdated URL.
- Check if the manga title is still available by searching for it again in the Browse tab under the same source.
- If you can find a working version, delete the broken entry from your library.
- Search and add the new, working version to your library.
- Alternatively, use the Migrate function on the broken entry to switch to the exact same source, which can reset the URL without losing your reading progress.
Phase 2: Clear Stale Data
Old, stuck data can prevent the app from fetching the new, correct URLs.
3. Clear App Cache
Clearing the cache ensures that no old, cached data is interfering with the new fetch requests.
- Go to the More tab.
- Go to Settings.
- Navigate to Advanced.
- Tap Clear cache to make sure nothing is stuck.
4. Clear Cookies and WebView Data
Sometimes, failed security checks (which can manifest as a 404 if the redirect is broken) leave behind conflicting cookies.
- In the same Advanced settings menu.
- Tap Clear cookies and Clear WebView data.
Phase 3: Check External Status
Sometimes, the 404 is unavoidable because the source site itself has changed or removed the content.
5. Check Availability with WebView
Use the in-app browser to see if the content is still live on the website.
- Go to the manga’s details page in Tachiyomi.
- Tap the WebView icon (usually in the top toolbar).
- If the page opens in the internal browser and shows a 404 error, the manga has officially been removed from the source.
- If the page opens to a working website but the app still fails, then you must try searching the title through a different source and use the Migration feature to transfer your progress.
Tachiyomi HTTP Errors Reasons
| Error Code | Meaning | Cause | Tachiyomi Fix |
| 404 (Not Found) | The requested resource (manga/chapter) does not exist at that specific address. | The website changed the URL, the title was removed, or the extension code is outdated. | Update/Reinstall Extension, Migrate Title, Clear Cache. |
| 5xx (Server Error) | The error is on the website’s server side (e.g., 503 Service Unavailable). | The website is down for maintenance, overloaded, or has a critical error. | Wait it out. You cannot fix this—the website staff must fix it. |
If you are receiving a 404 error, you are probably searching for something that doesn’t exist on the website anymore, or the app cannot find the correct link. Focus on updating the extension and migrating the title to a working source.