Data and text tool

Base64 Encode/Decode

Encode text or data to Base64, or decode Base64 strings back to plain text. Runs entirely in your browser — nothing is sent to a server.

How to use Base64 Encode/Decode

Developer tools guide for base64 encode/decode users.

Base64 is an encoding scheme that converts binary data into a string of ASCII characters. It's used extensively in web development: embedding images in CSS, encoding email attachments, passing binary data in JSON APIs, and storing small assets inline in HTML.

This tool handles both directions: paste plain text or a data URI and encode it, or paste a Base64 string and decode it back. URL-safe Base64 (which replaces + with - and / with _) is also supported via the toggle.

What this tool does

Encodes plain text or binary strings to Base64 and decodes Base64 back to readable text. Supports standard and URL-safe Base64 variants.

How to use it

Paste your input into the text area. Click Encode or Decode. Copy the result. Toggle URL-safe mode for use in URLs or filenames.

Best practices

Base64 increases data size by ~33%. Don't use it to 'encrypt' data — it's an encoding, not encryption, and is trivially reversible by anyone.

Quick checklist

Use Encode for text → Base64; use Decode for Base64 → text.
For URL embedding, enable URL-safe mode (replaces + and / with - and _).
Base64 is not encryption — don't use it for passwords or secrets.
Data URIs start with 'data:image/png;base64,' — paste the full string to decode embedded images.

Answers