Base64 Encoder & Decoder

Encode and decode text and files to Base64 format instantly

Client-side Processing File Support Data URL Format Auto-detection

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About Base64

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format.

Common uses:

  • Email attachments
  • Data URLs in web pages
  • API data transmission
  • Configuration files

Data URL format: data:image/png;base64,iVBOR...

Base64 encode/decode: APIs, data URLs, and debugging

Base64 represents binary as ASCII, which survives JSON, XML, and email bodies that cannot carry raw bytes. Developers use it for embedding small images, debugging upload pipelines, and inspecting tokens—never as encryption.

Encoding increases size by roughly a third; do not Base64 large media for fun.

Practical tips

  • Strip data-URL prefixes before decoding raw payloads.
  • Watch newline wrapping when pasting into strict parsers.
  • Prefer streaming uploads for large binaries instead of giant Base64 strings.
  • Redact secrets before sharing encoded snippets in tickets.

Common questions

Is Base64 encryption?
No. Anyone can decode Base64; it is encoding, not secrecy.
URL-safe variant?
Some APIs need `-` and `_` instead of `+` and `/`; convert accordingly.
File vs text mode?
Files produce longer strings; ensure your destination accepts the size.

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