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Reducing Your Minecraft World Save File Size Dramatically!!

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Shyao6644's Avatar Shyao6644
Level 40 : Master Pixel Puncher
Hello Fellow Minecrafters! Today I am going to teach you on how to reduce your Minecraft world save's file size. eg. My world was originally 74.44MB but I reduced it to 23.8MB. This is especially useful if you are going to upload your world onto the internet or if your computer is full. Here are the steps for reduction:

Locate your save file at the following directory:
Mac: FinderusernameLibraryApplication Supportminecraft
Vista: C:UsersusernameAppDataRoaming.minecraft

Then go into the folder 'saves'. Locate your world save folder. eg. Shyao6644's Ultimate World. Then make a backup of the whole save folder onto your desktop. Then follow these steps on reducing the file size:
1. In the saves folder go inside your world save folder and then delete all the unnecessary mod files if you have any. eg. aether.dat . All the files and folders you should have left over are now level.dat, level.dat_old, region, session.lock, spc.settings and data.
2. Now go into the folder named data. Now in this folder is your map saves. If you opened an unnecessary map on minecraft then you should delete it. eg. In minecraft you opened 2 maps, Map_0 and Map_1, but you didn't need Map_1 so in your save folder you can delete map_1.dat and in minecraft the save for that map is gone and the map that originally had that save on it is now a blank new map. The files you should have left over are idcounts.dat and your needed map saves.
3. Caution: This step reduces your save dramatically but if you do it wrong you will mess up your save so make sure you have a backup copy of the original on your computer somewhere!!!! Okay now that we got that through, go into your folder named region. In here you will find your actual saves of your world. eg. Creeper holes and buildings. In here you can delete all the files except r.-1.-1.mcr, r.-1.0.mcr, r.-2.-1.mcr, r.-2.0.mcr, r.0.-1.mcr and r.0.0.mcr (r.0.0.mcr can be deleted I think because I did it once and it still worked but just leave it alone to be safe).

Okay now check your world save file folder and it should be around 20-30MB (Big reduction eh?). Now make a backup of your now reducted save somewhere on your computer. Go into minecraft and check if your world is still the same. If not then I don't know what went wrong because it works for me. If it doesn't work then just copy the backup of the original back into the saves folder and retry. Note:In minecraft the world will still say it's the original file size because it to lazy to change to the reducted size. :D Okay now if it works then your world is now reducted and ready for your use! Hoped this helped! ;P

Your Sincerely,

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08/26/2019 1:08 am
Level 1 : New Miner
lucekira's Avatar
THANK YOU! Now I can finally upload my world into Aternos server and play with my friend, thank you kind person
03/07/2017 6:24 pm
Level 1 : New Network
AceofArrows's Avatar
Thanks! Everyone keep in mind it works by removing areas which you have discovered, re-discovering the areas will put the data back in the file and you'll have to delete it again.
03/02/2017 7:26 am
Level 1 : New Network
dangerORclose's Avatar
Hey i have just a hub but i have 280 maps in the data folder.
How do i know wish one i may delete? Or none?
My hub folder is like 114 mb
03/21/2015 11:13 am
Level 1 : New Miner
Adrian89's Avatar
Sort by date modified and delete just the oldest modified files ".mca" and keep the newest ".mca" files.
06/23/2014 2:07 pm
Level 19 : Journeyman Artist
Elliptisoar's Avatar
This will only work if your world only occupies the first few chunks around 0,0. What you are telling us to do is remove every single chunk except for the 6 right around 0x, 0y. If you have any buildings say, 500 blocks outside 0,0, they will be gone after you delete the said files.

And so I advise, DO NOT DO THIS unless you know exactly what you are doing! But then again, that's what backups are for.
07/20/2014 8:59 am
Level 42 : Master Blob
Olhcim's Avatar
Yeah, this could remove important parts of your world and like Elliptisoar said, i wouldnt recomend doing this.

Although what you can do is use MC Edit and trim your world, deleting unused chunks - Just remember that different versions of the game have different world generation algorithms.
04/30/2014 10:59 am
Level 1 : New Miner
MineralBoy's Avatar
In region the files that are there are r.0.0.mca, r.0.-1.mca, r.-1.0.mca, and r.-1.-1.mca. I see they are most of the file size, but what do I do if theyre the only files? o.O Any suggestions?