TEXT ENCRYPTER

About data encryption

Data encryption transforms readable text into ciphertext that looks like random data. Without the correct password, an unauthorized person cannot recover the original content — even if they have the encrypted file. Only someone who knows the password used during encryption can decrypt it and read the data again.

Text Encrypter lets you protect passwords, seed phrases, notes, or any plain text by encrypting content you paste or upload as a .txt file. The encrypted result is saved to your device; keep that file and your password safe, because both are required for decryption later.

When to encrypt data

You should encrypt data when you want to stop others from reading it — so that only the person who knows the password can view the original content. Encryption is useful whenever files might be seen by someone who should not have access.

Consider encrypting data stored in places others can reach, for example a shared computer, a family PC, a shared network drive, or cloud storage such as Google Drive, iCloud, Dropbox, or any similar service. Even if others can open the folder or download the file, they will only see encrypted text without your password.

Text Encrypter is well suited for sensitive information: passwords, recovery seed phrases, PIN codes, private notes, backup codes, and other confidential text you need to keep somewhere safe but not readable at a glance.

How AES-256-CBC works in TextEncrypter

By default, Text Encrypter hashes your password with SHA-256 to produce a 256-bit key, then encrypts your data with AES-256-CBC. AES (Advanced Encryption Standard) with a 256-bit key is widely used and considered secure when implemented correctly. CBC mode combines each block of data with a unique random IV (initialization vector) so the same plaintext never produces the same ciphertext twice. PKCS7 padding ensures the data length matches what AES expects.

Text Encrypter is open source and built on well-known, public encryption standards. The same methods are supported by many libraries and tools in different programming languages, so the process is transparent and can be verified or reimplemented by anyone. Source code is available on GitHub.

The encrypted .txt file that Text Encrypter saves to your disk is a JSON document with the essential details needed to decrypt it: the algorithm (aes-256-cbc), the encrypted payload, the IV, whether the password was hashed with SHA-256, and the padding scheme. Because this information is included in the file, anyone can write compatible decryption software in any technology — but the password is still required to recover the original data.

Is data encryption safe and secure?

In Text Encrypter, security depends on how the app works: your password is never sent anywhere — it is hashed with SHA-256 in your browser to derive the encryption key, and your data is encrypted with AES-256-CBC before the result is downloaded. An attacker who steals only the encrypted file cannot read it without guessing the correct password. With SHA-256 enabled, they must find a password whose hash matches the key used for encryption; the hash itself cannot be reversed to reveal the password.

For a random 10-character password using printable ASCII characters (~95 options per character), there are roughly 10¹⁹ possible passwords (about 59 quintillion). Even at billions of guesses per second on powerful hardware, hitting the correct password by brute force would take on the order of many thousands to millions of years. That is why Text Encrypter is safe for strong passwords — but real-world attacks target weak or common passwords first, so use a long, random password for sensitive data.

Privacy and security

Text Encrypter does not store your data, does not track you, and uses no analytics on your plaintext or passwords. All encryption and decryption runs locally in your browser. You can use the app offline after loading the page, and for maximum peace of mind, open it in a private browsing tab and disconnect from the internet while working with sensitive content.