Base64 Encoder/Decoder

Plain Text0 chars
Base64 Output0 chars
Output will appear here...

What This Tool Does

Base64 Encoder/Decoder is built for deterministic developer and agent workflows.

Encode and decode Base64 strings and files.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/base64/

For automation planning, fetch the canonical contract at /api/tool/base64.json.

How to Use Base64 Encoder/Decoder

  1. 1

    Encode text or file

    Paste text directly or upload a binary file (image, PDF, ZIP). Choose between Standard Base64 and URL-safe variants.

  2. 2

    View encoded output

    The tool shows the Base64 string instantly. For large files, streaming encoding prevents memory overload.

  3. 3

    Decode Base64 strings

    Paste an encoded string and decode to plaintext. Auto-detects charset and handles padding issues gracefully.

  4. 4

    Download decoded file

    When decoding binary data (images, archives), save the reconstructed file directly to your system.

  5. 5

    Compare size

    View original vs. encoded size and compression ratio. Useful for evaluating if Base64 embedding is practical.

Frequently Asked Questions

What is Base64 Encoder/Decoder?
Base64 Encoder/Decoder converts text and files to and from Base64 encoding. It is commonly used for embedding images in CSS, encoding API credentials, and working with data URIs.
How do I use Base64 Encoder/Decoder?
Paste text or upload a file, then choose Encode or Decode. The tool instantly converts your input and provides the result ready to copy. It handles both text strings and binary file data.
Is Base64 Encoder/Decoder free?
Yes. This tool is free to use with immediate access—no account required.
Does Base64 Encoder/Decoder store or send my data?
No. All processing happens entirely in your browser. Your data never leaves your device — nothing is sent to any server.
What is Base64 encoding used for?
Base64 encodes binary data as ASCII text. Common uses include embedding images in HTML/CSS via data URIs, encoding email attachments, transmitting binary data in JSON APIs, and encoding authentication credentials.