Text tools
Base64 Encode / Decode
/base64-encode-decode
Encode and decode Base64 and base64url, including files — without mangling non-ASCII text.
URL Encode / Decode
/url-encode-decode
Percent-encode and decode URLs — and see which of the three encodings you actually need.
Text & JSON Diff
/diff
Compare two files or pasted texts side by side — line diff, word-level highlights, and a structural view for JSON.
HTML Entity Encode / Decode
/html-entity-encode-decode
Encode and decode HTML entities — named, decimal and hex — without silently eating your markup.
JSON String Escape / Unescape
/json-escape
Escape a string for embedding in JSON — and see what JSON.stringify leaves unescaped that will still break your page.
Case Converter
/case-converter
camelCase, snake_case, kebab-case and the rest — with acronyms and digits split the way you meant.