Quick Summary
Text Online Viewer is a client-side suite for line-by-line text diff comparison, Base64 encoding/decoding, URL query parameter escaping, HTML entity conversion, string unescaping, and case switching.
Text Online Viewer & Side-by-Side Diff Checker
Compare text differences with line-by-line diff highlighting, encode/decode Base64 and URL queries, convert case styles, and calculate character analytics.
Line-by-Line Diff Checker
Compare Text A and Text B to highlight line additions (+ green) and deletions (- red) side by side (Alt+1).
Base64 & URL Encoders
Encode or decode binary-to-text strings, URL queries, and HTML entities securely in browser memory (Alt+3 / Alt+7).
Case Converters & Metrics
Convert text to UPPERCASE or lowercase while viewing real-time character, word, line, and byte size counters.
Frequently Asked Questions
How does Base64 encoding work?
Base64 converts binary or UTF-8 text data into 64 ASCII characters for safe transmission over HTTP headers and URL queries.
What is the difference between URL encode and HTML encode?
URL encode escapes special URL query characters (e.g. %20 for space), while HTML encode escapes reserved HTML tags (e.g. < for <).