PNG to JPG Converter — Free & Private

Convert PNG images to JPG using the mozjpeg encoder directly in your browser. No uploads, no server processing — your images stay on your device. Batch convert multiple files and fine-tune quality for the perfect size/quality balance.

Drag & drop PNG files here or

Supports .png files

90%

Converting...

Converted Images

Convert PNG Images to JPG Without Uploading Them Anywhere

PNG is a lossless format that excels at graphics, logos, and screenshots — but for photographs it stores far more data than most uses need, producing files 5–10x larger than a JPG of equivalent visual quality. This free online converter takes your PNG files and re-encodes them as JPG right in your browser, so you get smaller, universally compatible photo files without ever uploading a single byte to a server.

Why Convert PNG to JPG?

  • Much smaller file sizes — typical photo PNGs shrink by 80–90% when converted to JPG at high quality.
  • Faster page loads — smaller images mean better Core Web Vitals scores and happier visitors.
  • Email & upload friendly — many services limit upload size; JPG slips through where PNG hits the cap.
  • Universal compatibility — every photo viewer, printer, and device understands JPG.

How This Converter Works

Your PNG file is decoded in the browser, then re-encoded as JPG using mozjpeg — the open-source encoder developed by Mozilla and used by major CDNs and image-optimization platforms. Mozjpeg uses advanced techniques like trellis quantization, progressive encoding, and optimized Huffman coding to squeeze extra quality out of every byte. You get the same high-fidelity output as premium compression services, but everything runs locally on your device.

Privacy & Security

There is no upload. The converter is a pure WebAssembly application that loads once and then works entirely offline. Your PNG files never leave your device, never touch a server, and cannot be accessed, cached, or logged by anyone. This matters for business documents, personal photos, screenshots containing sensitive data, and any image you would rather not hand to a third-party service.

Tips for Best Results

  • Use 90% quality for photos you plan to view, share, or print — the output is visually indistinguishable from the source but much smaller.
  • Use 75–85% quality for web publishing where every kilobyte matters.
  • Keep transparency in mind — JPG flattens transparent pixels to white. For images with transparency, use PNG to WebP instead.
FAQ

Frequently Asked Questions

PNG files store images losslessly and tend to be large, especially for photographs. JPG uses lossy compression optimized for photos and produces files 5–10x smaller with visually indistinguishable quality at typical settings. Converting photos from PNG to JPG dramatically reduces storage and page-load time. Note that JPG does not support transparency — transparent pixels will be filled with white.

The tool decodes your PNG in the browser, then re-encodes it as JPG using the mozjpeg encoder compiled to WebAssembly. Mozjpeg is the same open-source JPEG encoder used by major CDNs and image-optimization services. Everything happens locally — your file never leaves your device.

No. All conversion happens entirely on your device using WebAssembly. Your PNG files are never transmitted, uploaded, stored, or accessed by any server. The tool works offline after the initial page load and there are no server-side file size limits.

JPG does not support transparency, so any transparent or semi-transparent pixels in your PNG will be flattened against white before encoding. If you need to preserve transparency, use PNG to WebP instead — WebP supports alpha transparency while still producing much smaller files than PNG.

The default 90% quality is ideal for converted PNGs — it produces a noticeably smaller file while preserving nearly identical visual quality. For smaller files at minor quality cost, try 75–85%. For archival-grade output, use 95%. Below 70%, compression artifacts may become visible in smooth gradients and sharp edges.