[DECRYPT FILE ONLINE]

Free file decryption that runs in your browser — nothing is uploaded, nothing is stored.

Drop in a .enc file, supply the password or key it was encrypted with, and get your original file back. Decryption happens locally using the Web Crypto API, so the encrypted file and the key you type never leave your device — you can confirm that yourself in your browser's Network tab.

There is no account, no file size cap, and no queue. Large files are processed in 2 MB chunks so a multi-gigabyte archive works the same way a text document does.

ENCRYPT_FILE_ONLINE_v1.0.0
🔒 [ENCRYPT] 🔓 [DECRYPT]

[1] SELECT FILE

[2] CHOOSE ENCRYPTION ALGORITHM

[4] ENCRYPT FILE

[WHAT THIS TOOL CAN DECRYPT]

This decrypter reads the .enc format produced by CryptFile.Online. It reads the algorithm, key-derivation method, salt and IV straight out of the file header, so you do not have to remember which settings you used — only the password or key.

  • Files encrypted with AES-256 on this site
  • Files encrypted with ChaCha20-Poly1305 on this site
  • Password-derived keys (PBKDF2, 600,000 iterations), random 256-bit keys, and keys you supplied yourself
  • Files that were compressed before encryption — decompression is automatic

[WHAT THIS TOOL CANNOT DECRYPT]

Being direct about this saves you time. A decryption tool can only reverse an encryption it understands, and it always needs the key.

  • Files encrypted by other software. VeraCrypt, 7-Zip, BitLocker, OpenSSL and GPG each use their own container formats. Use the tool that created the file.
  • Files held by ransomware. If your files were renamed with an unfamiliar extension and you were asked for payment, no online decrypter can help. See No More Ransom, a free service run by Europol that identifies ransomware strains and provides genuine decryptors where they exist.
  • Files whose key you have lost. Strong encryption without the key is not a puzzle to be solved — it is arithmetically out of reach. Nobody can recover it, including us.
  • Password-protected PDFs or Office documents. Those use their own in-format encryption; open them in the application that made them.

[WHY DECRYPT IN THE BROWSER INSTEAD OF UPLOADING]

Most "online decrypt" services upload your file to a server, decrypt it there, and hand you a download link. That means a stranger's machine sees both your ciphertext and your key — which defeats the point of having encrypted the file at all.

This tool never transmits either. The decryption runs in JavaScript on your own machine using your browser's built-in cryptography. Load the page once and you can even disconnect from the internet before decrypting.

[HOW TO DECRYPT A FILE ONLINE]

Decrypt an encrypted file in your browser without uploading it to a server.

  1. Select the encrypted file. Choose your .enc file with the file picker or drag it onto the drop zone. The tool reads the header and detects the algorithm and key method automatically.
  2. Enter the password or key. Type the password used to encrypt the file, or paste the 256-bit key in hex or base64 form. The tool shows which one the file needs.
  3. Decrypt. Click decrypt. The file is processed locally in 2 MB chunks and the authentication tag is verified to confirm the file has not been altered.
  4. Download the original file. Save the decrypted file. Its original filename is restored from the metadata stored in the encrypted file header.

[FREQUENTLY ASKED QUESTIONS]

Is it safe to decrypt a file online?

It is safe here, because nothing is uploaded. The decryption runs in your browser using the Web Crypto API, so the encrypted file and your key stay on your device. You can verify this by opening your browser developer tools, switching to the Network tab, and confirming no request carries your file. Be far more careful with services that require an upload.

Can I decrypt a file without the password or key?

No. AES-256 and ChaCha20-Poly1305 are designed so that decryption without the key is computationally infeasible — there is no back door and no recovery option. If you have lost the key, the data is gone. This is what makes the encryption worth using.

Which file types can be decrypted?

Any file type. The tool operates on raw bytes, so PDFs, Word and Excel documents, images, videos, ZIP archives, database dumps, config files and VPN profiles all decrypt identically. The original filename and extension are restored from the file header.

Is there a file size limit for decryption?

There is no hard limit. Files are read and decrypted in 2 MB chunks, so memory use stays modest even for very large files. Files above roughly 500 MB will simply take longer, depending on your device.

Why does decryption fail with the correct password?

The most common causes are a trailing space in the pasted password, a different keyboard layout than the one used when encrypting, or a file that was truncated or altered in transit — for example by an email gateway. The tool verifies an HMAC-SHA256 authentication tag, so a modified file is rejected rather than silently producing corrupt output.

Can I decrypt a file encrypted by someone else?

Yes, provided it was encrypted with this tool and they have given you the password or key. Send the encrypted file and the key through separate channels — for example the file by email and the key by a messaging app — so that intercepting one does not reveal the other.