Convert PNG to JPG Online — Free, 100% Local
100% local processing. The tool runs entirely inside your browser — nothing is uploaded to any server.
PNG is a great format when you need transparency, sharp text or pixel-perfect fidelity — screenshots, logos, UI mockups, technical diagrams. It is a poor format for photographs, and for anything that gets shared over the web at scale, because it stores every pixel losslessly and produces file sizes 5-20x larger than JPG for the same visible image. Converting PNG to JPG is one of the fastest wins for reducing image weight: a 5 MB PNG photograph typically becomes a 300-500 KB JPG that looks the same. This page walks through how to do that conversion in the browser using ImageMarker, without uploading your PNG anywhere.
The conversion itself is straightforward. Drop a PNG on the tool, the browser's Canvas API re-encodes it as JPG at your chosen quality (default 90%), and the result downloads. Batch mode is supported for whole folders. Because the encoding happens locally, there is no server round-trip and no file size limit beyond your device's memory. A large batch of PNG screenshots converts in seconds on a modern laptop.
The one thing worth being explicit about: JPG does not support transparency. If your PNG has transparent pixels — a logo on a transparent background, a screenshot with a translucent overlay, a design mockup with alpha edges — those pixels get filled with a solid color when converted to JPG. The default is white, which is usually what a photo-editor expects. You can change the fill color in the tool if the destination expects a different background. If you need transparency preserved, convert to WebP instead: it supports transparency and produces files even smaller than JPG.
Common practical reasons to convert: reducing a folder of PNG screenshots so it fits in an email attachment, uploading a phone screenshot to a form that only accepts JPG, embedding a design mockup in a shared document without inflating the file, uploading an ID scan to a portal that rejects PNG. The privacy angle: ImageMarker runs the entire conversion inside your browser tab. The source PNG never leaves your device, which matters especially for ID scans, contracts and other private material that PNG format is often used for.
Cut a 5 MB PNG photograph to 300-500 KB JPG with no visible quality loss.
Choose the color that transparent pixels get filled with — white by default.
Batch mode: drop a folder of PNGs, get JPGs back in a single operation.
Frequently asked questions
How much smaller does the JPG version get?
For photographs and screenshots with lots of color detail, a JPG at 85% quality is typically 60-90% smaller than the source PNG. For simple images (logos, flat-color UI elements), the difference is smaller — often only 20-40% — because PNG already compresses flat color efficiently.
What happens to transparent pixels?
JPG does not support transparency, so transparent pixels get filled with white by default. You can change the fill color in the tool to match your destination background. If you need transparency to survive, convert to WebP instead — WebP supports it and is often even smaller than JPG.
Is my PNG uploaded to a server?
No. ImageMarker uses the browser's Canvas API to re-encode locally, so the source PNG never leaves your device. This matters for ID scans, contracts and screenshots of private material where PNG was chosen for fidelity.
Does converting PNG to JPG lose quality?
JPG is lossy, so technically yes — but at 85-90% quality the visible difference on a photograph or a screenshot is essentially zero at normal viewing distance. For a photograph, JPG at 85% is what any camera would produce anyway. For a diagram with sharp lines and text, you might see faint compression halos; keep the quality above 90% or stay with PNG in that case.
Can I convert multiple PNGs at once?
Yes. Drop or select multiple PNG files and the tool processes them locally in batch. Because everything runs on your device, batch throughput is limited only by memory — a modern laptop handles hundreds of PNGs in one operation.
What quality setting should I use?
85-90% for photographs and screenshots — visually indistinguishable from the source, dramatic size cut. 95% if the destination is print or a large display. Below 75% starts to show visible JPG artifacts around sharp edges.
Ready to try it? The tool loads instantly — no sign-up, no upload.
Open the PNG → JPG converterSee also