Convert PNG to Base64 instantly

Convert PNG images to Base64 data URIs in your browser. No upload needed. Paste the result directly into HTML, CSS, or JSON.

Drop your PNG file here

or click to browse

Your files stay private
No server upload
Instant conversion

Example

Input (PNG)

[icon.png]
A 64x64 app icon with transparency
File size: 3.2 KB

Output (BASE64)

data:image/png;base64,iVBORw0KGgoAAAANSUhEUg...
(~4.3 KB of Base64 text, ready to paste into CSS or HTML)

About this converter

Need to embed a small PNG directly in your HTML, CSS background-image, or a JSON API response? This tool reads your PNG file and outputs a ready-to-use data URI (data:image/png;base64,...). The encoding runs locally with your browser's btoa() function. Your image never leaves your device. Best for small assets like icons, logos, and UI sprites under ~30 KB. Anything larger and the Base64 string will bloat your page size by about 33% compared to serving the file normally.

PNG vs BASE64

Portable Network Graphics (PNG)

PNG (Portable Network Graphics) is a lossless image format that supports transparency, making it ideal for graphics, icons, and screenshots.

Common uses: screenshots, graphics with transparency, and lossless images

W3C PNG specification

Base64-Encoded String (Base64)

Base64 is a binary-to-text encoding scheme that represents binary data as an ASCII string. Developers use it to embed images directly in HTML, CSS, JSON APIs, and anywhere binary data needs to travel as plain text.

Common uses: embedding images in HTML/CSS, data URIs, API payloads, and email attachments

RFC 4648 (Base64 specification)

How to convert PNG to BASE64

  1. 1

    Upload

    Upload your PNG file using the drop zone above, or click to browse your device.

  2. 2

    Convert

    Click the "Convert to BASE64" button. The conversion runs instantly in your browser.

  3. 3

    Download

    Download your converted BASE64 file. No data was sent to any server.

Frequently Asked Questions

Last updated: 2026-03-23