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Encoders & Decoders

Browse our free collection of encoders & decoders. All tools run locally in your browser for maximum privacy.

8 Tools

Encoders & Decoders handle the translation between binary and text representations, Base64, URL encoding, HTML entities, JWT tokens, and certificate decoding. These tools are essential when debugging API payloads, inspecting authentication tokens, or preparing data for transport through text-only channels.

Common Workflows & Recommended Tools

01

Decode a Base64-encoded API response to inspect the raw JSON

→ Base64 Encoder/Decoder
02

Decode a JWT to inspect claims and expiration without sending it anywhere

→ JWT Decoder
03

Encode URL parameters safely per RFC 3986

→ URL Encoder/Decoder
04

Decode an X.509 certificate to inspect its subject, SANs, and validity

→ Certificate Decoder
05

Encode/decode HTML entities in user-generated content

→ HTML Entity Encoder

Common Mistakes to Avoid

  • ✗Treating Base64 as encryption, it is encoding only. Anyone who intercepts Base64 data can decode it trivially.
  • ✗Decoding JWTs on a third-party website that transmits the token to its own server, use a client-side decoder instead.
  • ✗Double-encoding URL parameters, encoding an already-encoded string produces %25 instead of the intended character.
  • ✗Confusing URL encoding (%20) with HTML entity encoding ( ), they serve different contexts and are not interchangeable.

Privacy-First by Design

Encoded data often includes authentication tokens, certificates, and API payloads. All encoding and decoding runs client-side, your tokens and credentials never leave your browser.

Frequently Asked Questions

Is Base64 encryption?

No. Base64 is an encoding scheme that converts binary data to ASCII text. It provides no security, anyone can decode it. Use encryption (AES, ChaCha20) for confidentiality.

Is it safe to decode JWTs in a browser tool?

Yes, as long as the tool runs client-side. AllDevToolsHub JWT Decoder runs entirely in your browser, the token is never transmitted to any server.

What is the difference between URL encoding and HTML entity encoding?

URL encoding (%XX) is for safe transport in URLs per RFC 3986. HTML entity encoding (&name; or &#NNN;) is for safe inclusion in HTML documents. They use different character sets and serve different purposes.