Base64, URL & Cryptographic Hash Encoder /
Encode, decode, and hash strings in real time. Features Base64, URL encoding, HTML entities, Hex ASCII, and Web Crypto SHA-256 hashing.
🔐 Cryptographic Security Guarantee
Unlike online encoding portals that send your passwords or API tokens across the internet, this suite executes entirely inside your browser sandbox using native crypto.subtle and typed array buffers. Zero data is ever sent over the network.
About this tool
How to use it
- Type or paste your text into the main input textarea.
- Inspect the real-time outputs across Base64, URL percent-encoding, SHA-256 cryptographic hash, HTML entities, and Hex bytes.
- Click 'Copy' next to any output field to instantly transfer the encoded value to your clipboard.
- Use 'Decode Base64' or 'Decode URL' to reverse encoded strings back into plaintext.
Why it matters
Web developers frequently need to encode binary payloads, prepare query strings, escape user input against XSS vulnerabilities, and compute cryptographic hashes. Doing this through server-dependent websites risks leaking sensitive API keys or credentials. A local Web Crypto encoder provides instant transformations with total privacy.
When to use it
Use this tool when inspecting JWT authorization tokens, debugging REST API URLs, sanitizing HTML input, verifying data integrity hashes, or working with raw byte streams.
Good to know
Cryptographic hashing utilizes the browser's native window.crypto.subtle.digest standard, ensuring zero server transmission of your data.
Common questions
What is the difference between Base64 and URL encoding?
Base64 encodes arbitrary binary or text data into 64 printable ASCII characters (including +, /, and =). URL encoding (percent-encoding) replaces reserved URI characters with %XX format so they can safely pass through web addresses.
Can SHA-256 hashes be reversed into original plaintext?
No. SHA-256 is a one-way cryptographic mathematical hash function. It is designed to be computationally impossible to reverse back into the original input string.
Does this handle multi-byte Unicode and emojis?
Yes. Standard browser `btoa` fails on Unicode characters, but this tool includes an internal UTF-8 byte stream handler to seamlessly encode complex scripts and emojis.
Are my strings or secret keys uploaded to any server?
Never. All string manipulation and cryptographic hashing executes 100% locally in your client browser memory.