PNG → JPG 변환 — 무료 온라인 도구
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By the AllFileBox Team · Last updated: 2026-06-28
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PNG to JPG is a free online tool that converts PNG images into compact JPG files in your browser, shrinking large graphics for faster sharing while flattening transparency onto a solid background.
Why convert PNG to JPG
PNG files can be very large because they are lossless, which is wasteful for photographs that do not need pixel-perfect edges. Converting to JPG applies efficient lossy compression, often cutting the file size dramatically, which speeds up email, uploads, and web pages. JPG is also the most universally accepted photo format across devices and platforms.
What happens to transparency
JPG does not support transparency, so any transparent areas in the PNG are filled with a solid background, usually white, during conversion. This is fine for photos and flattened graphics but means a logo meant to sit over other content should stay as PNG. Knowing this avoids the surprise of a white box appearing behind a transparent image.
Quality and compression
JPG quality is adjustable, trading sharpness for size. A high setting keeps photos looking clean while still saving space, and a lower setting maximizes compression for thumbnails and previews. Because JPG is lossy, repeated re-saving gradually softens an image, so convert once from the PNG master rather than editing the JPG over and over.
Private and local
PNG to JPG runs in your browser. The image is drawn to a canvas, re-encoded as JPG locally, and returned as a download. Nothing is uploaded or stored, so your images never leave your device. The conversion completes in a fraction of a second for a typical photo.
사용 방법 PNG → JPG 변환
- Open the PNG to JPG tool and add your image.
- Pick a JPG quality level if offered.
- Let the tool re-encode the image in your browser.
- Review the smaller result and its file size.
- Download the JPG image.
Shrink a large screenshot
Shrink a large screenshot
Convert a heavy PNG screenshot to JPG so it attaches to an email or uploads to a form quickly.
Prepare a web photo
Turn a PNG photo into a compact JPG so a web page loads faster for visitors.
Make a thumbnail
Use a lower JPG quality to produce a small preview image from a large PNG.
| Quality | File size | Best for |
|---|---|---|
| High | Larger | Photos you keep |
| Medium | Smaller | Web and email |
| Low | Smallest | Thumbnails |
관련 도구
주요 기능 PNG → JPG 변환
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