RSA Tool

RSA key generation, encryption, decryption, signing, and verification using Web Crypto API. Free, private, and 100% client-side.

param.keySizeModeparam.key

Input

Output

Local only

Recent history

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How to use

Select mode: generate, encrypt, decrypt, sign, or verify.
Choose a key size (1024/2048/4096).
For generate: copy the key pair. For other modes: paste keys and input.
Copy or download the result.

Frequently asked questions

What key size should I use?: 2048-bit is the minimum recommended for general use. 4096-bit provides higher security margin. 1024-bit is insecure and provided for legacy only.
Is my data uploaded anywhere?: No. All RSA operations happen locally in your browser using the Web Crypto API.

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