Online encoding and decoding tools

Base64 URL encoding HTML escaping MD5 AES

Base64 encoding and decoding

Encode text as Base64 or decode it back to text. Supports UTF-8, including non-Latin characters. Useful for data transfer, image data URIs and API parameters.

Input text

Result

URL encoding / decoding

Percent-encode special characters, non-ASCII text and spaces in URLs, or decode them. Useful for query parameters and handling links.

Input

Result

Encoding converts non-ASCII and special characters to hexadecimal sequences beginning with %. Decoding reverses this. Encode a parameter before inserting it into a URL.

HTML escaping / unescaping

Convert special characters such as < > & " to HTML entities, or restore the original symbols. Useful for displaying text without interpreting it as HTML.

Input

Result

Calculate an MD5 hash

Calculate a 32-character hexadecimal MD5 digest of text to compare content or create short identifiers. MD5 is unsuitable for password storage or security-sensitive integrity checks.

Input text

MD5 digest

MD5 is a one-way digest. The result here uses 32 lowercase hexadecimal characters.

AES encryption / decryption

Protect text with AES symmetric encryption and a custom passphrase (16 or more characters recommended). Output is Base64; decryption requires the same passphrase. All processing stays in your browser.

Passphrase

Use at least 16 random characters. Decryption requires exactly the same passphrase.

Plaintext / ciphertext

Result

AES-256 in the OpenSSL format, with a random salt and key derivation. Compatible tools must use the same derivation method and settings. This format does not authenticate ciphertext and cannot detect every modification. Output is Base64.

Online codecs for text and data transfer

Working with APIs, query parameters, pages and data often requires Base64, URL encoding, HTML escaping, MD5 hashes or AES encryption. These Online encoding and decoding tools bring common encoding and cryptographic operations together in your browser, with no installation required.

Calculations run locally in your browser and tool inputs are not uploaded. You can use them for code snippets, API parameters and text.

Base64 encoding and decodingConvert between text and Base64 with UTF-8 support, including image data URIs.

URL encodingPercent-encode or decode query parameters and non-ASCII links.

HTML escapingConvert special characters to entities and back. HTML escaping is not rich-text sanitization.

MD5 digestQuickly calculate a content fingerprint for consistency checks.

AES encryption and decryptionLocal encryption compatible with a legacy format; it does not authenticate ciphertext.

When these tools help

Use them for frontend parameters, API debugging, URL handling, escaping content and comparing content hashes. Enter text, choose an operation and copy the result.

Frequently asked questions

Are these tools secure?

Encoding and cryptographic operations run in your browser. Inputs and keys are not uploaded as tool requests. Device security, browser extensions and clipboard access can still affect confidentiality.

Does Base64 support non-Latin text?

Yes. The tool uses UTF-8 so supported characters can be encoded and decoded without losing the original text.

Is MD5 encryption?

MD5 is a one-way hash used for non-security content checks and fingerprints. Do not use it to store passwords. AES supports reversible encryption.

What if I lose my AES passphrase?

AES requires the same secret for decryption. If you lose it, you cannot recover the plaintext through this tool. Store it securely, for example in a password manager.

Privacy: Encoding, hashing, encryption and decryption run locally in your browser. Tool inputs are not uploaded or saved by the site. Manage any copies, downloads and browser-restored content yourself.

Online encoding and decoding tools

Base64 encoding and decoding

URL encoding / decoding

HTML escaping / unescaping

Calculate an MD5 hash

AES encryption / decryption

Online codecs for text and data transfer

When these tools help

Frequently asked questions

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