hello, and welcome.
have you ever wanted to switch between creative mode and survival?
or have you ever wanted to switch between survival and creative mode?
well, now you Can! thanks to the minecraft seed-software!

This is how:

you download the file from the link.
then, you open it with winrar, and navigate the file : "minecraftseed" to desktop. Or anywhere else.
you open the software and you'll see this:
(the picture of above)on the left bar you see your world. you click it and select the world you want to change.
Then you check the checkbox that says: "creative mode"
or "survival mode"
or "hardcore mode"
(The mode you want to switch it to)
Then you click "save changes" and you close the program.
now open minecraft, select the world, and play it.
TADA!
and you're done!

Here is the download link!
https://github.com/thedarkfreak/Minecraft-Save-Seed-Reader/wiki