CleanBase64 lets you convert text to Base64 and convert Base64 back to text. Requires no extra permissions to run, does not use data, does not show ads. Tiny footprint, takes up almost no space on your device.
Base64 is used mainly by programmers and IT people, but it can also be useful to hide email addresses and phone numbers on sites that block those.
Base64 is not "encryption" as it can be easily decoded by any other base64 program, but it is useful for hiding content from automated scanners. Some websites block email addresses or phone numbers so this is an easy way to overcome that.
You can type in or paste text using the Paste icon on the left, and copy the results using the big Copy button.