Online encoding tools
This category brings together 6 online encoding tools that translate data from one representation into another without losing information: text to Base64, special characters to percent-encoding, HTML entities, JWT tokens into their readable header and payload, hash fingerprints, and numbers across binary, octal, decimal and hexadecimal. Every one of them runs entirely in the browser, so whatever you paste never reaches a server.
These are the utilities a developer opens halfway through a debugging session: working out why a URL with accents breaks a request, checking which claims the token your API returns actually carries, computing the SHA-256 of a downloaded file, or embedding an icon in CSS as a Data URI. Each page explains the algorithm, the real use cases and the classic mistakes, because encoding is not encryption and confusing the two causes a fair share of security incidents.
Tools in this category
Base64 Encoder
Encode and decode text in Base64 format
URL Encoder
Encode and decode special characters in URLs
JWT Decoder
Decode JWT tokens showing header, payload and signature
Hash Generator
Generate MD5, SHA1, SHA256 and SHA512 hashes
HTML Encoder
Encode and decode HTML entities
Number Base Converter
Convert numbers between binary, decimal, hexadecimal and octal
Frequently asked questions
Are encoding and encryption the same thing?
No. Encoding changes how data is represented so it can travel through a particular channel, and anyone can reverse it without a key: Base64, percent-encoding and HTML entities protect nothing. Encryption requires a key, and without it the data is unrecoverable. To protect sensitive information use the security category, not an encoder.
Is my data sent to a server when I use these tools?
No. All 6 tools in this category are client-side: the processing happens in your browser through native APIs such as TextEncoder or Web Crypto. You can verify it by going offline and confirming that they still work, which is why they are safe for pasting development tokens or internal content.
Which tool do I need to inspect an authentication token?
The JWT decoder: it splits the token into header, payload and signature and displays the claims along with their expiry. Remember that decoding is not validating: signature verification must always happen on the server with the matching secret or public key.