Developer Tools

Base64 & URL
Encoder / Decoder

Encode or decode Base64 and URL (percent) strings instantly. UTF-8 safe, two-way, and processed entirely in your browser — your data never leaves the page.

Two-way

UTF-8 safe

100% offline

# base64
Hello → SGVsbG8=

# url encode
a b&c → a%20b%26c

Frequently Asked Questions

What is Base64 used for?

Base64 encodes binary data as ASCII text so it can travel safely through systems that only handle text — email attachments, data URIs, JSON payloads, and HTTP basic-auth headers.

Does Base64 encrypt my data?

No. Base64 is encoding, not encryption — anyone can decode it instantly. Never use it to protect secrets; use real encryption for that.

What is the difference between URL encoding and Base64?

URL (percent) encoding escapes only unsafe characters in a URL, e.g. a space becomes %20. Base64 re-encodes the entire input into a 64-character alphabet. They solve different problems.

Is my input sent to a server?

No. All encoding and decoding runs locally in your browser with JavaScript. Nothing is uploaded, logged, or stored.