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About SM4 Decryption Tool
Free online SM4 decryption tool supporting CBC, ECB, CTR, OFB, and CFB modes. Supports Base64 and hexadecimal input formats. Secure and reliable national cryptography algorithm decryption service, all operations are performed locally.
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User Guide
Key Features
- SM4 decryption tool supporting text and file decryption, with CBC, ECB, CTR, OFB, and CFB modes
- Supports Base64 and hexadecimal input formats
How to Use
- Open the tool page — no installation needed
- Choose text or file mode, paste your Base64 or hexadecimal ciphertext, enter the secret key (and IV except for ECB), and set the mode/input format as needed
- Click "Decrypt" to generate the plaintext, then click "Copy" to grab it
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 Decryption Tool?
Free online SM4 decryption tool supporting CBC, ECB, CTR, OFB, and CFB modes. Supports Base64 and hexadecimal input formats. Secure and reliable national cryptography algorithm decryption service, all operations are performed locally.
How do I use SM4 Decryption Tool?
Open the tool page — no installation needed Choose text or file mode, paste your Base64 or hexadecimal ciphertext, enter the secret key (and IV except for ECB), and set the mode/input format as needed Click "Decrypt" to generate the plaintext, then click "Copy" to grab it
What should I know before using SM4 Decryption 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 Decryption Tool free to use?
Yes, SM4 Decryption Tool is completely free. No download or installation required — it runs right in your browser.