GenzeeImage Format Converter
Convert images between PNG, JPG and WebP right in your browser — with a quality slider for the lossy formats and before/after file sizes. Your image never leaves your device.
PNG, JPG or WebP — which and when?
The three formats solve different problems. JPG compresses photographs brilliantly but is lossy and has no transparency — the default for photos, and what most upload forms expect. PNG is lossless and supports transparency, ideal for logos, screenshots and graphics with text, at the cost of much larger files for photos. WebP is the modern web format: typically 25–35% smaller than JPG at the same visual quality, with transparency support — but a few older systems and government portals still reject it. Converting between them is a daily need precisely because each has territory where it wins.
How to use this converter
Choose an image, pick the target format, and — for JPG or WebP — set the quality slider. The converted preview, both file sizes and a download button appear immediately. Everything happens via your browser's canvas engine on your own device: no upload, no queue, no watermark, and it keeps working offline once the page has loaded.
How it works
One consequence worth knowing: converting to JPG flattens transparency onto a white background, because JPG cannot represent it. And converting JPG → PNG doesn't restore lost detail — lossy damage is permanent; PNG just stops further loss.
Worked example
A designer's logo arrives as a 2.1 MB PNG, but a directory site demands JPG under 200 KB. Selecting JPG at 85% produces a 96 KB file — accepted first try (transparency flattens to white, fine for that use). Meanwhile the same designer's website hero photo, a 1.4 MB JPG, converts to WebP at 80% and lands at ~420 KB — the page loads visibly faster with no visible quality change. Same tool, opposite directions, both wins.
When is this useful?
Upload forms that accept only one format (job portals, government sites, marketplaces), converting screenshots for documents, preparing WebP versions to speed up your website, extracting a usable JPG from a WebP that desktop software won't open, and shrinking bloated PNG photos. If size rather than format is the problem, the image compressor resizes and compresses in one pass, and the image to PDF converter handles the "send it as one PDF" requests.
Frequently asked questions
Will converting to JPG lose quality?
JPG is lossy, so some detail is discarded — at 85% quality the difference is invisible for most photos. Keep an original copy, and use PNG when pixel-perfect fidelity matters.
What happens to transparency when converting to JPG?
JPG has no transparency, so transparent areas are flattened onto white. Convert to PNG or WebP instead if you need the transparency preserved.
Why is my PNG bigger than the JPG it came from?
PNG is lossless — for photographic content it stores far more data than lossy JPG. That's expected; PNG only wins on graphics, text and screenshots.
Is WebP safe to use everywhere?
All modern browsers support WebP, and most platforms accept it. A minority of older portals and desktop apps still reject it — that's exactly when you convert back to JPG here.
Are my images uploaded to your server?
Never. Conversion runs in your browser via the canvas API — load the page, disconnect from the internet, and it still works. Private photos stay private.