Changing KOReader directory on Android.

foreverconfused · 07-07-2026, 04:27 AM

I am using KOReader on Android 16. I have even tried to migrate the app to external storage. However, the KOReader folder still is still located in Internal Storage. How can I truly migrate the app to external storage so it recognizes the "Fonts" folder in my External Storage instead?

pazos · 07-07-2026, 10:22 AM

Is not possible unless your ROM has a setting that allows you to move the primary storage partition to the external storage. And 99% of users wouldn't want that as sdcards are extremely slow.

foreverconfused · 07-07-2026, 04:19 PM

Quote:

Originally Posted by pazos

Is not possible unless your ROM has a setting that allows you to move the primary storage partition to the external storage. And 99% of users wouldn't want that as sdcards are extremely slow.

I see, can I at least make the app load custom fonts and plugins from SD card then?

pazos · 07-07-2026, 08:03 PM

not really, at least not without fiddling with the code. Maybe it is possible to squeeze a patch in internal storage that changes runtime enough to load the rest of the stuff from the external storage path.

People do fancy Ai stuff these days, you could try that.

IMO not worth it for a few KB of plugins. Im not sure how many GB of fonts do you have around. If less than 1 I wouldn't bother with that either.

foreverconfused · 07-08-2026, 05:15 PM

I have 10GB worth of fonts

I don't understand why it is not easy to add a custom Font directory. Librera has one.

pazos · 07-09-2026, 01:08 AM

Quote:

Originally Posted by foreverconfused

I don't understand why it is not easy to add a custom Font directory. Librera has one.

Because it is a niche feature for a single platform we support, most devices have plenty of internal storage and the majority of them lack any kind of external storage.

But on top of all because almost nobody needs 10GB of fonts in an ereader

I see you opened a ticket in github: https://github.com/koreader/koreader/issues/15658

Unlikely to get addressed as you would like. Somebody could write a patch that you could adapt to your specific needs. The logic that determines which paths are used is in https://github.com/koreader/koreader...t_settings.lua

foreverconfused · 07-09-2026, 01:48 PM

Quote:

Originally Posted by pazos

Because it is a niche feature for a single platform we support, most devices have plenty of internal storage and the majority of them lack any kind of external storage.

But on top of all because almost nobody needs 10GB of fonts in an ereader

I see you opened a ticket in github: https://github.com/koreader/koreader/issues/15658

Unlikely to get addressed as you would like. Somebody could write a patch that you could adapt to your specific needs. The logic that determines which paths are used is in https://github.com/koreader/koreader...t_settings.lua

I understand. I realize that developers actually addressing this is very unlikely. On the other hand, is it realistically possible to do this with a plugin? I'd be willing to try a plugin then. I understand this is possible, but the question is if it is realistic or not.

pazos · 07-09-2026, 05:23 PM

Quote:

Originally Posted by foreverconfused

I understand. I realize that developers actually addressing this is very unlikely. On the other hand, is it realistically possible to do this with a plugin? I'd be willing to try a plugin then. I understand this is possible, but the question is if it is realistic or not.

on the FM there's a + button. On android, if there's an external storage available, you should see a menu entry to switch between internal storage and "sdcard". It should work as is.

If that works and you are able to navigate to your fonts directory once on the sdcard it should be possible to write a small patch that uses the same logic to return the fonts directories that way.

Unfortunately I no longer have an android device with external storage so I'm not able to help :/

That's why I suggested using an ai model in the 1st place.

But yeah, try that and tell me if you are able to navigate. By default the fonts dir ough to be empty unless you enable view unsupported files on the file manager.

foreverconfused · 07-09-2026, 05:47 PM

Thank you. Now that I know it should be realistically possible, I'll try to get it working with the help of AI

Navigation does work. I can easily see my SD card contents. However, it is sometimes a little bit slow: I click and wait a few seconds before it opens a particular folder, even though there are not many files inside.

07-07-2026, 04:27 AM	#1
foreverconfused Member Posts: 23 Karma: 10 Join Date: Jul 2024 Device: Bigme Inknote Color Lite	Changing KOReader directory on Android. I am using KOReader on Android 16. I have even tried to migrate the app to external storage. However, the KOReader folder still is still located in Internal Storage. How can I truly migrate the app to external storage so it recognizes the "Fonts" folder in my External Storage instead?

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07-07-2026, 10:22 AM	#2
pazos cosiñeiro Posts: 1,413 Karma: 2452477 Join Date: Apr 2014 Device: BQ Cervantes 4	Is not possible unless your ROM has a setting that allows you to move the primary storage partition to the external storage. And 99% of users wouldn't want that as sdcards are extremely slow.

07-07-2026, 08:03 PM	#4
pazos cosiñeiro Posts: 1,413 Karma: 2452477 Join Date: Apr 2014 Device: BQ Cervantes 4	not really, at least not without fiddling with the code. Maybe it is possible to squeeze a patch in internal storage that changes runtime enough to load the rest of the stuff from the external storage path. People do fancy Ai stuff these days, you could try that. IMO not worth it for a few KB of plugins. Im not sure how many GB of fonts do you have around. If less than 1 I wouldn't bother with that either.

07-08-2026, 05:15 PM	#5
foreverconfused Member Posts: 23 Karma: 10 Join Date: Jul 2024 Device: Bigme Inknote Color Lite	I have 10GB worth of fonts I don't understand why it is not easy to add a custom Font directory. Librera has one.

07-09-2026, 05:47 PM	#9
foreverconfused Member Posts: 23 Karma: 10 Join Date: Jul 2024 Device: Bigme Inknote Color Lite	Thank you. Now that I know it should be realistically possible, I'll try to get it working with the help of AI Navigation does work. I can easily see my SD card contents. However, it is sometimes a little bit slow: I click and wait a few seconds before it opens a particular folder, even though there are not many files inside.