Base64 Encode

Convert plain text to Base64, decode Base64 back to text, and copy or download the result.

Input
Output
0 characters 0 lines

What does Base64 Encode do?

Base64 Encode converts text to Base64 and decodes Base64 back to readable text in your browser.

  • Primary use: Base64 Encode converts text to Base64 and decodes Base64 back to readable text in your browser.
  • Key technical fact: Standard Base64 maps 3 input bytes to 4 output characters, so output is usually about 33.3% larger.
  • Practical check: Validate the result before using it in authentication, signing, checksum, or transport code.
Topic Direct answer Source
Direct answer Base64 Encode converts text to Base64 and decodes Base64 back to readable text in your browser. IETF RFC 4648
Key fact Standard Base64 maps 3 input bytes to 4 output characters, so output is usually about 33.3% larger. IETF RFC 4648
Processing model Runs locally in the browser; no production Node server receives the input. Browser JavaScript

Encode text for Base64 transport and storage

This Base64 encoder turns plain text into an ASCII-safe Base64 string and can decode it again for a quick round trip. It is useful when a value must travel through JSON, HTML, environment variables, command output, email, or other systems that expect printable text.

Base64 is an encoding format, not encryption. Anyone with the string can decode it, and the encoded output is usually about one third larger because every 3 bytes become 4 Base64 characters.

How to use

  1. Paste plain text or a Base64 value into the input editor.
  2. Choose Encode to create a Base64 string, or Decode to read an existing Base64 string.
  3. Check the output editor and status message. Invalid Base64 input is reported immediately when decoding fails.
  4. Use Copy for the clipboard, Download for a text file, or Clear to reset both editors.

What is Base64 encoding?

Base64 encoding represents bytes with a limited alphabet of letters, numbers, +, /, and optional = padding. That makes binary or Unicode-derived data easier to place in text-only channels.

Use Base64 for representation and transport, not secrecy or compression. If you need confidentiality, use encryption; if you need integrity, use a hash or signature; if you need smaller files, use compression before encoding.

Input notes

Encoding accepts normal text, including Unicode. When decoding, paste the complete Base64 value without labels, quotes, headers, or surrounding prose; missing padding or extra characters can make a valid payload fail.

Example

A short message becomes an ASCII-safe Base64 value and can be decoded back to the original text:

--- Plain Text ---
Hello, World!

--- Base64 Encoded ---
SGVsbG8sIFdvcmxkIQ==

--- Decoded Back ---
Hello, World!

MCP integration

MCP (Model Context Protocol) lets AI agents and apps discover and run Coding.Tools utilities for repeatable conversions, formatting, hashing, and generation workflows.

MCP tool name: base64-encode

MCP endpoint: https://coding.tools/mcp

Call tools/list first. Each tool entry includes inputSchema, outputSchema, and examples so an AI agent or client can build valid arguments without guessing.

For tools/call, read result.content[0].text for the display value and result.structuredContent for machine parsing. Tool-level failures return isError: true; protocol failures return a JSON-RPC error.

Example tools/call request:

curl -s https://coding.tools/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "MCP-Protocol-Version: 2025-06-18" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"base64-encode","arguments":{"input":"Hello from Coding.Tools MCP"}}}'

Most text and data tools accept an input string plus optional options. Browser-only image tools are listed for discovery and return a web UI link when they need browser image APIs.