Is my PNG uploaded to a server?

No. All processing happens entirely in your browser using the FileReader API. Your image is never sent to any server.

Does the tool preserve PNG transparency?

Yes. The PNG is embedded as-is using its original MIME type (image/png), so transparency (alpha channel) is fully preserved in the output HTML.

Why is the HTML file larger than the original PNG?

Base64 encoding expands binary data by roughly 33%, so the resulting HTML file will be approximately 1.37x the size of the original PNG, plus a small HTML wrapper overhead.

Can I open the downloaded HTML file without internet?

Yes. The HTML file is fully self-contained — the image data is embedded directly inside the file, so it works offline in any browser.

Is there a file size limit?

There is no enforced limit, but very large PNG files (above 20 MB) may be slow to process in older browsers. For best performance, keep images under 10 MB.

Can I customize the HTML output after downloading?

Yes. The generated HTML is minimal and valid. Open it in any text editor to add styles, scripts, or other markup around the embedded image.

PNG to HTML Converter

Select a PNG file and download a self-contained HTML document with the image embedded as a base64 data URI.

Choose PNG Image

Drag & drop a PNG here, or click to browse

HTML Document Title

Sets the <title> tag and caption of the generated HTML file.

Preview

No image selected yet

Add a PNG using the panel on the left

Generated HTML snippet

Done!

Summary

This tool converts a PNG image into a self-contained HTML file by encoding the image as a base64 data URI and embedding it directly inside a minimal HTML document. All processing happens in your browser via the FileReader API — no file is ever sent to a server. The resulting HTML file can be opened offline in any browser and displays the image without any external files or network access.

How it works

Click "Choose PNG" or drag and drop a PNG file onto the upload area.
A preview of your image appears with file details.
Optionally set a custom title for the HTML document.
Click "Convert to HTML" — the image is encoded to base64 and wrapped in a minimal HTML template.
Click "Download HTML" to save the fully self-contained HTML file to your device.

Use cases

Bundle a PNG screenshot or diagram as a portable HTML file for offline sharing.
Embed a logo or graphic into a self-contained HTML email template.
Archive design mockups or UI screenshots in a format any browser can open without external dependencies.
Generate a base64-embedded image snippet to paste directly into an HTML or email builder.
Package a chart or infographic as a single HTML file for client handoffs.
Create offline-capable documentation pages with embedded PNG figures.
Convert transparency-preserving PNG images into HTML for use in presentations or demos.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu