PNG to Base64 Converter

Encode PNG images as Base64 data URLs with transparency preserved for inline CSS, HTML, and emails

Upload a PNG and encode it as a Base64 data URL with transparency preserved.

Data URL prefix: data:image/png;base64,

Drop a PNG file here or pick one below.

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What is PNG to Base64 Converter

Written by Giorgos Kostas. Last reviewed: April 18, 2026

PNG is a lossless image format that supports full alpha transparency. Encoding a PNG as Base64 embeds the exact pixel data into a text-safe data URL.

PNG to Base64 Encoder accepts a PNG file and returns a `data:image/png;base64,…` string you can drop into HTML `<img>` tags, CSS `background-image`, or any JSON field.

Why use it

Preserve transparency without the color banding that JPG introduces.
Inline icons, logos, and UI graphics in email templates where external images are blocked.
Embed small assets directly in a single-file HTML artifact.
Keep the conversion client-side — nothing leaves your browser.

Features

Lossless PNG encoding
Transparency preserved
Copy data URL or raw Base64
Drag-and-drop PNG upload
PNG never leaves your browser
Live PNG preview before copy

How to use PNG to Base64 Converter

Drop a PNG. Drag a PNG file into the tool or click Choose PNG.
Copy the data URL. Copy the full `data:image/png;base64,…` string or the raw Base64.
Paste it in. Drop it into HTML, CSS, JSON, or email HTML.

Example (before/after)

PNG file

logo.png (binary, 32 KB, RGBA)

Base64 data URL

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA…

Common errors

Blown-up HTML size

Every Base64-encoded PNG inflates the HTML by ~4/3 of its binary size.

Fix: Reserve Base64 for assets under ~50 KB; link to a CDN for larger graphics.

Copied data URL missing the prefix

Consumers that expect a full data URL reject a raw Base64 payload.

Fix: Copy the Data URL (with `data:image/png;base64,`) for HTML/CSS consumers.

FAQ

Does it keep transparency?

Yes. Encoding is byte-for-byte, so the alpha channel in the original PNG is preserved exactly.

Is my image uploaded?

No. The encoding happens in the browser using the FileReader API — no network request is made.

Can I decode it back later?

Yes — pair this with the Base64 to PNG tool to recover the original image.

Is there a file-size limit?

Practical limit is your browser's memory. We recommend staying under ~5 MB for smooth encoding.

Related tools

Related encoders and image tools: You can also browse the full Encoders & Decoders category for more options.

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