UD5 Toolkit
Atbash Cipher – Reverse Alphabet Encryption
Apply the ancient Atbash cipher (A→Z, B→Y) to any text. Since it's self‑inverse, encoding and decoding use the same function. Fun for code puzzles.
Tag: Encode - String & File Encoding
13+ toolsURL Component Encoder/Decoder - Online encodeURIComponent
Encode or decode a string for use in a URL query parameter. See the raw and encoded versions. Dev tool.
Polybius Square Cipher Tool – Online Encode & Decode
Encrypt or decrypt text using the classical 5x5 Polybius square. Excludes J or merges I/J.
Base58 Encoder & Decoder - Online Bitcoin-Style Address Tool
Encode or decode data to/from Base58 (Bitcoin alphabet). Useful for cryptocurrency address generation testing. Fully local, no data sent.
HTML Escape/Unescape - Online Encode Special Characters
Escape HTML special characters to prevent XSS attacks, or unescape HTML entities back to original text. Essential for web developers. Runs locally.
File to Base64 Encoder/Decoder - Online Download
Encode any file into a Base64 string that you can copy, or decode a Base64 string back to a downloadable file. Pure frontend.
Hashid Encoder/Decoder - Online Short Unique IDs from Numbers
Convert integers into short, unique, YouTube‑style IDs (hashids) and decode them back. Customize salt and minimum length.
String to Escaped HTML - Online Protect Against XSS
Instantly convert plain text into HTML‑safe escaped characters for secure display in web pages. Prevent cross‑site scripting. All processing local.
Geohash Encoder/Decoder - Online Lat/Lon to String
Encode latitude/longitude into a geohash string and decode a geohash back to coordinates with precision info. Local algorithm.
String Obfuscator - Online Text Encoder to Hide Content
Obfuscate strings using simple techniques to prevent casual reading. Useful for hiding spoilers or email addresses from bots. Decode with the same tool.
Email Obfuscator - Online Protect Address from Bots
Hide your email address from scrapers by encoding it using HTML entities and CSS tricks. Still clickable for real users. Local generator.
Image to Base64 Converter - Online Encode Picture to Text
Transform any image into a Base64 data URI for embedding directly into HTML, CSS, or JSON. Drag and drop support. Entirely browser-side conversion.
Text to Emoji Cipher - Online Encode Secret Messages
Convert your text into a string of emojis using a simple substitution cipher. Share secret messages that look fun. Decode them with the same tool. All local.