AES Encryption Tool

AES Encryption Tool | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Security
Input types: select, textarea, file, text
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The AES Encryption Tool provides secure encryption and decryption for text and files using the industry-standard AES-256-GCM algorithm. By generating authenticated cryptographic bundles containing the salt, initialization vector (IV), authentication tag, and ciphertext, it ensures data confidentiality and integrity without relying on external storage.

When to use

When you need to securely encrypt sensitive text snippets, passwords, or API keys before sharing them over insecure communication channels.
When you want to protect local files with authenticated AES-256-GCM encryption before uploading them to cloud storage providers.
When you need to decrypt an AES bundle JSON or encrypted file package using a pre-shared secret key.

How it works

1Select the input type (text or file) and choose whether to encrypt or decrypt.
2Enter your plaintext or upload your file, then provide a strong secret key passphrase of at least 8 characters.
3Choose your output encoding (Base64 or Hex) and run the tool to generate a secure JSON bundle or download the encrypted package.

Use cases

Encrypting database credentials or configuration files before committing them to public version control repositories.
Sharing confidential text messages or notes securely via email or chat applications using a pre-shared passphrase.
Securing personal documents, PDFs, or images locally before storing them on public cloud drives.

Examples

1. Encrypting API Credentials for Secure Sharing

DevOps Engineer

Background

A DevOps engineer needs to send a database connection string containing sensitive passwords to a remote developer over Slack.

Problem

Sending raw credentials over chat platforms risks exposure if the channel is compromised.

How to use

Set the input type to 'Text' and operation to 'Encrypt'. Paste the connection string into the text input, enter a strong passphrase, select 'Base64' encoding, and click encrypt.

Input Type: Text
Operation: Encrypt
Secret Key: SuperSecretPass123!
Output Encoding: Base64

Outcome

The tool generates a secure JSON bundle containing the ciphertext, IV, and auth tag, which can be safely shared and decrypted by the developer.

2. Decrypting a Received Text Bundle

Software Developer

Background

A developer received a JSON bundle containing encrypted configuration parameters from a teammate.

Problem

The developer needs to recover the original plaintext configuration parameters using the pre-shared key.

How to use

FAQ

What encryption algorithm does this tool use?

It uses AES-256-GCM, which provides both data confidentiality and authenticated integrity checks.

What is included in the output text bundle?

The output JSON bundle contains the algorithm name, output encoding, salt, initialization vector (IV), authentication tag, and ciphertext.

Can I decrypt files that were encrypted using this tool?

Yes, you can decrypt them by selecting the decrypt operation, uploading the encrypted package, and entering the correct secret key.

What is the maximum file size supported?

The tool supports file uploads up to 20 MB for encryption and decryption.

Is my secret key stored on your servers?

No, all encryption and decryption operations are performed locally in your browser, and your secret key is never stored or transmitted.

Input Type: Text
Operation: Decrypt
Text Input: {"algorithm":"aes-256-gcm","encoding":"base64","salt":"c2FsdC1mb3ItYWVzLXRvb2w=","iv":"AQIDBAUGBwgJCgsM","authTag":"1VBqj1TTlms/dNQoH4WMGA==","ciphertext":"h4VrXvk="}
Secret Key: test-key-123

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Encrypting API Credentials for Secure Sharing

2. Decrypting a Received Text Bundle

FAQ

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