Truly invisible files are impossible to make, but you can hide files to certain levels.
The first level is just making it hidden in it's properties.
Second level is giving it a white icon and putting it as name Alt+255 which is equal to space, but it's a valid filename, so you effectively get a somewhat hard to detect file in plain sight.
Third level is by using a hiding application which uses the registry for setting special properties.
Fourth level is the STRONGEST level overall and it's by ENCRYPTING your files and then hiding them with an application.
If you don't need to access the file directly you can use other OS who uses a different file system to encrypt the data and then save it, depending on the format and the settings you can make a file undetectable by the OS, which means you won't be able to access it until you boot the other OS.
Only in the last case, which might not be useful for you can the files be completely undetectable, every other method as a flaw and can be detected. Some applications make a good job hiding stuff, but any disk searcher can find the existence of these files by showing the space consumed by them.
Since your question is lacking in the specific details that would assist me to further assist you with advice, I'm going to assume you are using Linux, because I have no way to know if your using windows, right? See this would make a difference, and it's important for me to know in order to assist you. Now what would one mean by make invisible? Gone for good? Or there but invisible? Since I think you must be using Linux, with a broken search engine, here's some linux commands that might help you.
I suppose you googled and didn't like the answer?
Truly invisible files are impossible to make, but you can hide files to certain levels.
The first level is just making it hidden in it's properties.
Second level is giving it a white icon and putting it as name Alt+255 which is equal to space, but it's a valid filename, so you effectively get a somewhat hard to detect file in plain sight.
Third level is by using a hiding application which uses the registry for setting special properties.
Fourth level is the STRONGEST level overall and it's by ENCRYPTING your files and then hiding them with an application.
If you don't need to access the file directly you can use other OS who uses a different file system to encrypt the data and then save it, depending on the format and the settings you can make a file undetectable by the OS, which means you won't be able to access it until you boot the other OS.
Only in the last case, which might not be useful for you can the files be completely undetectable, every other method as a flaw and can be detected. Some applications make a good job hiding stuff, but any disk searcher can find the existence of these files by showing the space consumed by them.
Opening a file which is invisible should be very easy. Please follow the following steps to open files which are hidden i.e. are invisible
**Step 1**
Click on the Start button or next to start button in the search box type, "Control Panel"
**Step 2**
Once the Control Panel window open up. Search for, "File Explore Option" folder
**Step 3**
Click "File Explore Option" and than a new window opens up named, "File Explorer Options", it has three menus: General, View and Search
***Step 4*
The final step click, "View" - You will see a radio button, ""show hidden files" - Select this radio button and save.
Once you save this option, you can now view all the hidden files on a computer.
Since your question is lacking in the specific details that would assist me to further assist you with advice, I'm going to assume you are using Linux, because I have no way to know if your using windows, right? See this would make a difference, and it's important for me to know in order to assist you. Now what would one mean by make invisible? Gone for good? Or there but invisible? Since I think you must be using Linux, with a broken search engine, here's some linux commands that might help you.
https://help.ubuntu.com/community/DeletingFiles