Text Encryptor
Encrypt and decrypt text with AES-256-GCM and a passphrase.
Input
Settings
Run
Results
Results will appear here once you run the tool.
About Text Encryptor
Encrypt and decrypt text with AES-256-GCM and a passphrase. Paste or type your text into Text Encryptor, adjust the settings, and the result appears below.
Your files stay on your device. ZyncTools has no upload step: the file is read in your browser, processed there, and handed straight back to you. There is no account, no watermark and no size cap beyond what your own device can hold.
Settings. Text Encryptor gives you control over action, passphrase and key strengthening.
Also known as: encrypt, decrypt, aes, password, secure, cipher.
How to use Text Encryptor
- Add your input. Paste or type your text into the input box. You can also load a text file from your device.
- Choose your settings. Adjust action, passphrase, key strengthening to suit what you need.
- Run the tool. Press Run. Processing happens on your own device, so the time it takes depends on your machine rather than a queue.
- Save the result. Copy the output, or press Download to save it. Nothing is kept once you close the tab.
Frequently asked questions
How strong is the encryption?
AES-256-GCM with a key derived from your passphrase using PBKDF2 at up to 600,000 rounds. That is the same primitive used by password managers. Its strength depends almost entirely on your passphrase being long and unguessable.
Are my files uploaded when I use Text Encryptor?
No. Text Encryptor runs entirely inside your browser. Your text is read locally, processed on your own device, and handed straight back to you. You can confirm this yourself: open your browser's developer tools, watch the Network tab, and run the tool — no request carries your data anywhere.
Is Text Encryptor free?
Yes, completely. No account, no sign-up, no watermark on your output, and no cap on how many times you can use it. The project is open source under the AGPL licence.
Does Text Encryptor work offline?
Mostly. The site caches itself after your first visit, so it keeps working without a connection. Tools that need a specialised library — PDF editing, OCR, QR codes, MP3 encoding — need a connection the first time you run them, then that library is cached too.