How to Decrypt CSV
- 1Upload the .enc file you received or created earlier.
- 2Enter the password used during encryption.
- 3Decryption verifies the GCM authentication tag automatically.
- 4Download the restored plaintext CSV.
Security · browser workspace
Decrypt Encrypted CSV Files in Your Browser
Open HappyCSV .enc files with the correct password. AES-GCM decryption runs locally — wrong passwords fail safely without corrupting anything.
Quick start
Built for decrypt previously encrypted csv files.
Everything runs in your browser, so you can test the workflow with sample data when available before using production files.
Output: A new file or report produced locally in your browser.
- 1Choose a supported file or use sample data when available.
- 2Set the options shown for this workflow.
- 3Process the file locally, inspect the result, and download a new copy.
Preparing your private workspace…
Why Use This Tool?
- ✓Authenticated - Tampered files refuse to decrypt
- ✓Fast Failure - Wrong passwords error immediately and safely
- ✓No Server Round-Trip - Plaintext exists only in your tab
- ✓Same Engine - Fully compatible with files from Encrypt CSV
Frequently Asked Questions
What does an authentication error mean?
Almost always a wrong password. It can also mean the file was truncated or modified in transit.
Can you recover files if I forgot the password?
No. By design there is no recovery path, which is exactly what makes the encryption trustworthy.
Does decryption reveal the password strength?
No. Decryption either succeeds with the exact password or fails; it never leaks information about near-misses.