Image to Base64

Convert one image locally into a Base64 data URI you can copy into HTML, CSS, JSON, or text files.

Image Upload

Click or drag an image file here

1 image · Max 2MB
Base64 Result
0 characters

What does Image to Base64 do?

Image to Base64 converts image files into Base64 data URI strings for embedding in HTML or CSS.

  • Primary use: Image to Base64 converts image files into Base64 data URI strings for embedding in HTML or CSS.
  • Key technical fact: Base64 data usually grows by about 33.3% before the extra data: URI prefix is added.
  • Practical check: Compare visual quality, pixel dimensions, metadata, and exported file size before publishing the processed image.
Topic Direct answer Source
Direct answer Image to Base64 converts image files into Base64 data URI strings for embedding in HTML or CSS. IETF RFC 4648
Key fact Base64 data usually grows by about 33.3% before the extra data: URI prefix is added. IETF RFC 4648
Processing model Runs locally in the browser; no production Node server receives the input. Browser JavaScript

Turn a small image into a data URI

Image to Base64 reads one image in your browser and returns a complete data: URI. Paste it into HTML, CSS, JSON, or other plain-text contexts when a separate image file would be inconvenient.

Base64 is not compression. It usually increases the encoded data by about 33%, plus the MIME prefix such as data:image/png;base64,. Keep it for small icons, placeholders, and self-contained snippets rather than large photos.

The file is read locally and limited to one image up to 2MB for predictable performance. Embedded data URIs can avoid separate requests, but they also make HTML/CSS harder to cache and edit.

How to use

  1. Drag and drop an image file onto the upload area, or click to select.
  2. The Base64 encoded data URI appears in the text editor below.
  3. Use Copy to copy the result or Save to download as a text file.

When should you use image Base64?

Image Base64 is useful for tiny assets that must travel inside a single HTML, CSS, JSON, or text file.

Use normal image files for larger assets so browsers can cache them separately. Because Base64 expands the data and keeps any image metadata inside the encoded bytes, check size and privacy before embedding.

Convert with Python

Programmatic conversion reads the image bytes, Base64-encodes them, and adds the correct data URI prefix:

import base64
from PIL import Image

with open('image.png', 'rb') as f:
    encoded = base64.b64encode(f.read())
data_uri = 'data:image/png;base64,' + encoded.decode()

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: image-to-base64

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":"image-to-base64","arguments":{"input":{"url":"https://coding.tools/assets/img/photo2pixel-demo.png"}}}}'

For image-to-base64, pass a public image URL as input.url. For private local files, use the web UI or send the file bytes as Base64 with options.mimeType.

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.