RSA Encrypt / Decrypt
RSA keys, encrypt and decrypt.
🔑RSA Encrypt / Decrypt
All processing happens locallyWhat this tool does
RSA Encrypt / Decrypt is a RSA Encrypt / Decrypt that computes locally and shows the result instantly., everything runs inside your browser, so neither the key nor the plaintext ever leaves your device.
Copy the result directly. Keys are never persisted anywhere, so save them yourself.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
1024 bit is only for legacy compatibility. Start at 2048 bit for new projects, and use 3072 or 4096 for long-lived sensitive data.
OAEP uses randomised padding and resists chosen-ciphertext attacks, so prefer it. PKCS#1 v1.5 is older but the most compatible.
No. Keys are created with the local Web Crypto API and live only in page memory; a refresh clears them.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.