Are my images uploaded to a server?

No. The entire conversion runs inside your browser using the HTML5 Canvas API. Your image never leaves your device.

Will the PNG be higher quality than the original JPG?

The PNG will be lossless, meaning no further quality is lost. However, any compression artifacts already present in the JPEG cannot be reversed — the PNG simply preserves the exact pixels decoded from the JPG.

Why is the PNG file larger than the original JPG?

PNG uses lossless compression, which is less space-efficient than JPEG's lossy compression for photographic images. A larger file size is normal and expected when converting from JPG to PNG.

Does the PNG support transparency?

JPG images do not contain transparency data. The converted PNG will have a fully opaque background. To add transparency, you would need a separate background-removal step.

What JPEG variants are supported?

Standard .jpg and .jpeg files are both supported. Progressive JPEGs and baseline JPEGs are handled automatically by the browser's built-in image decoder.

Is there a file size limit?

The practical limit is your browser's available memory — typically several hundred megabytes. Very large images over 30 megapixels may be slow to process on low-end devices.

JPG to PNG Image Converter

Upload a JPG and download a lossless PNG instantly — converted entirely inside your browser with no file upload.

Upload JPG

Click or drag a JPG here

JPG and JPEG files supported

Preview (PNG output)

Upload a JPG to see the PNG preview

Conversion happens instantly, entirely in your browser

Downloaded!

Summary

This tool converts JPG and JPEG images to lossless PNG format entirely inside your browser using the HTML5 Canvas API. No files are ever uploaded to a server — your images stay completely private on your device. PNG uses lossless compression, so the converted image retains full pixel fidelity without the artifacts introduced by JPEG encoding. The output PNG file is typically larger than the original JPG, which is expected for lossless format.

How it works

Select or drag a JPG/JPEG image onto the upload area.
The tool decodes the image in your browser using the Canvas API.
A lossless PNG is generated from the decoded pixel data.
A live preview and file size comparison appear immediately.
Click "Download PNG" to save the converted image to your device.

Use cases

Convert product photos to PNG for e-commerce platforms requiring lossless images.
Prevent further compression generation loss during future editing cycles.
Prepare images for web graphics that require a transparent background layer.
Convert social media JPGs to PNG for use in presentations or documents.
Archive photographs in a lossless format to prevent quality degradation over edits.
Convert screenshots saved as JPEG back to PNG for clearer text rendering.
Prepare images for tools or workflows that require PNG input.
Process images privately without uploading to any third-party service.

Frequently Asked Questions

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