RSA Public and Private Key Basics Online

RSA is easiest to understand when you see a real key pair and try encrypting a short message yourself.

3 common issues 1 matching tools Follow steps, then fix it

Common situations

Start from what you need to do

Public key encrypts, private key decrypts

For a simple encryption workflow, the public key is the shareable side and the private key is the side you must keep protected.

Keep the payload short

Browser-side RSA tools are best for short text checks and demos. Large files or long data blocks are not the right fit.

Generate, test, then export

A practical flow is: generate a key pair, encrypt a short message, confirm decryption works, then export the keys you need.

Steps

1 Start by matching your situation with the problem cards below.

2 Open RSA Key Tool and fix the issue directly on the tool page.

3 After that, verify the output and continue into the next step if needed.

Recommended tools

Related how-to guides

FAQ

Can I use the same page for long documents?

Not ideally. RSA is better suited to short messages and key-exchange style workflows.