BrowserTools

JPG to PNG Converter

Convert JPG/JPEG images to lossless PNG

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-01
Free Private No uploads
What is JPG to PNG Converter?

Think of this as a container change, not a quality upgrade. The lossy step happened years ago when the JPG was first written; re-encoding what survives of it into a lossless format cannot bring back detail the original threw away. Expect a larger file that looks identical. What you gain is a predictable raster: full 8-bit RGB or RGBA with no chroma subsampling, which matters once the next stage of your pipeline — a print RIP, a vector editor, a diff-based review, a colour-managed export — starts reading pixels literally. There is deliberately no quality slider, because PNG leaves nothing to tune. Up to 50 JPGs convert in one pass and download as a ZIP.

Convert JPG and JPEG images to lossless PNG format instantly. Batch processing supported and, unlike online converters, your images are processed locally and never uploaded to a server.

Private JPG to PNG Converter In Your Browser

JPG to PNG Converter is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use JPG to PNG Converter

1

Add JPG or JPEG files to the Convert to PNG drop zone; batches are capped at 50 files.

2

Let each file decode and re-encode — there is no quality control to set, because PNG encoding is lossless.

3

Compare the original and new byte counts printed under every thumbnail.

4

Save the batch with Download all (N) as ZIP, or the plain Download button for one file.

Key Capabilities
  • Produces a true 8-bit lossless PNG rather than a renamed JPEG
  • No quality slider is shown, because there is nothing to tune in a lossless encode
  • Accepts 50 JPG or JPEG files per run and packages them into a single ZIP download
  • Reports both byte sizes for every file so the size increase is visible before you commit to it
Common Use Cases
  • A packaging designer handing artwork to a printer whose RIP rejects chroma-subsampled JPEG at large output sizes.
  • A reviewer putting before-and-after images into version control and needing a stable byte-for-byte format across machines.
  • A designer moving a photo into an illustration tool that quantises colour on import and mangles 4:2:0 data.
Clear Answers

Frequently Asked Questions

Why is the output bigger than the input?
JPG compresses by discarding information; PNG compresses by preserving everything. The surviving JPG data has to be stored losslessly, and lossless storage of a photographic image is larger than a lossy approximation of the same image. This is the expected outcome, not a failure.
Does converting to PNG improve the picture?
No. It removes further loss from this point onward, but it cannot restore what compression already discarded. Blurring, ringing around high-contrast edges, and blocked colour in skies are baked in before the file reaches this tool.
What happens to a JPG that already has an alpha channel?
Most JPGs do not — the format has no alpha channel. If a file arrives as a CMYK JPEG, the browser's decoder converts it to sRGB first, and the PNG you receive is an sRGB image. Colour management is worth checking in your print workflow.
Does the conversion send my photos to a server?
It does not. Everything runs in your own tab using the browser's image decoder, so opening the Network panel in DevTools and dropping a file will show no request leaving.

Related Guides

View all guides →
Image & PrivacyDo Image Converters Upload Your Photos?A converter that runs inside the page decodes your file into memory and re-encodes it there, so nothing is sent anywhere and you can check that claim yourself in the Network tab. That is a different promise from a server-side tool, where the photo lands on hardware you do not control. What each format costs, and how to verify it, is below; to convert a file now, the PNG to JPG converter linked from this guide works in the browser.