Private Base64 Decoder

Private Base64 Decoder is a browser-based tool for encoding and decoding Base64 strings, data URIs and JWT payloads without sending your data to a server. It keeps everything local in the browser so you can inspect text, images and files quickly and privately.

The interface handles plain text and uploaded files, recognises URL-safe Base64 used in tokens, and offers character-set options when output isn’t standard UTF-8. Decoded images and documents can be previewed and downloaded straight from the page.

• Local, in-browser processing — nothing is uploaded
• Support for standard Base64 and Base64URL (JWTs)
• Data URI inspection and file handling with previews
• Line-by-line decoding and character-set selection

This is useful if you regularly inspect API payloads, debug tokens, check embedded assets or examine logs. For situations where privacy matters — API keys, internal IDs or sensitive attachments — keeping decoding local reduces the risk of accidentally sharing data. The tool’s site is at https://base64decode.ai/.