Free Online Decoders - Base64, JWT, URL, and More
Decode any of the formats below without sending the value to a server. Useful for debugging tokens, payloads, and encoded URLs.
10 tools in this section
Decode Base64 to Text Online
Decode Base64-encoded strings back to readable text. Free online Base64 decoder with UTF-8 support.
URL Decode Percent-Encoded Text Online
Decode percent-encoded URL strings back to readable text. Free online URL decoder for query strings and URIs.
Decode JWT Tokens Online
Decode and inspect JWT token headers and payloads without verification. Free online JWT decoder with claim analysis.
Decrypt AES-256 Encrypted Text Online
Decrypt AES-256-GCM encrypted Base64 ciphertext back to plaintext. Free online AES decryption tool.
Decode Caesar Cipher Online - Brute Force All Shifts
Decode Caesar cipher text by trying all 26 shift values. Free online Caesar cipher decoder and cracker.
Base64 to Text Decoder - Free Online Tool
Decode a Base64 string back to readable text online for free. Inspect data URIs, JWT segments, and encoded headers, all in your browser.
Decode URL Online
Decode a percent-encoded URL online for free. Turn %20 and other escape sequences back into readable text, runs in your browser.
Decode HTML Entities Online
Decode HTML entities back to plain text. Free online HTML unescape tool that converts <, &, and numeric entities to characters, no signup.
Decode Bearer Token Online
Paste a bearer token from an Authorization header and decode the JWT instantly. Reads the header, payload, and claims in your browser, no signup.
Decode a Punycode (xn--) Domain Online
Paste an xn-- domain and see the real Unicode name behind it. Spot IDN homograph and phishing lookalikes. Free decoder that runs in your browser.
Full Tool Pages
About These Tools
Every tool in this section is free and runs entirely in your browser on ToolBox. There are no uploads, no accounts, and no usage limits, so your files and data stay on your own device. Browse the full tool directory for everything else.