About SM4 Encryption Tool
Free online SM4 encryption tool supporting text and file encryption. Supports CBC, ECB, CTR, OFB, CFB modes. All operations are performed locally for data security.
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User Guide
Key Features
- SM4 encryption tool that encrypts both text and files, with CBC, ECB, CTR, OFB, CFB modes and Base64/Hex output
- All operations run locally in your browser — your data never leaves your device
How to Use
- Open the tool page — no download or installation needed
- Choose text or file mode, then enter your plaintext and secret key (optionally set the IV, cipher mode, and output format; the key can be generated with one click)
- Click "Encrypt" to generate the ciphertext, then click "Copy" to grab the result
Important Notes
- This tool is completely free and requires no sign-up
- Everything runs locally in your browser — your data never leaves your device
Frequently Asked Questions
What is SM4 Encryption Tool?
Free online SM4 encryption tool supporting text and file encryption. Supports CBC, ECB, CTR, OFB, CFB modes. All operations are performed locally for data security.
How do I use SM4 Encryption Tool?
Open the tool page — no download or installation needed Choose text or file mode, then enter your plaintext and secret key (optionally set the IV, cipher mode, and output format; the key can be generated with one click) Click "Encrypt" to generate the ciphertext, then click "Copy" to grab the result
What should I know before using SM4 Encryption Tool?
This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device
Is SM4 Encryption Tool free to use?
Yes, SM4 Encryption Tool is completely free. No download or installation required — it runs right in your browser.