Base64 Encoder and Decoder

Encode / Decode

Encode text or binary to Base64 and decode Base64 strings back to plain text.

Input

#base64#base64 encode#base64 decode#data uri

About Base64 Encoder and Decoder

Encode text or binary to Base64 and decode Base64 strings back to plain text. Base64 Encoder and Decoder runs entirely in your browser — no installation, no uploads, and no data ever leaves your device.

Common use cases: embed images as data uris in html/css; encode api credentials for http basic auth; decode base64 payloads from api responses or emails. Whether you are debugging, prototyping, or building production code, having a fast and private tool for this task saves time compared to writing one-off scripts or using an online tool that logs your data.

Like every tool in Catalyst, this one is free forever, requires no login, and is safe to use with confidential data. All processing happens client-side via native browser APIs.

How to use Base64 Encoder and Decoder

1
Open the tool
Open Base64 Encoder and Decoder directly — no signup or installation required. The interactive interface loads instantly.
2
Paste or enter your input
Drop your data into the input area. The tool validates and processes your input live as you type or paste.
3
Review the result
The output updates instantly. If the tool has configuration options, adjust them and watch the result update.
4
Copy or download
Use the copy button to send the result to your clipboard. Nothing is saved between page loads, so closing the tab discards everything.

Frequently asked questions

Is Base64 encryption?

No. Base64 is an encoding, not encryption. Anyone can decode a Base64 string instantly without a key. Use it for data transport (URLs, HTTP headers, embedded images), never for protecting secrets. For real encryption, use the AES tool in the Security Toolkit.

Can I encode binary files like images to Base64?

Yes. Upload any file (PNG, PDF, zip, etc.) and the tool produces a Base64 string you can embed as a data URI. Typical use: inlining small icons in HTML or CSS to reduce HTTP requests.

What's the difference between Base64 and Base64 URL-safe?

Standard Base64 uses + and / characters, which have special meaning in URLs. Base64 URL-safe (RFC 4648 §5) replaces them with - and _ so the string can be used in URLs and filenames without percent-encoding. JWTs use Base64 URL-safe.