온라인 무료 이미지 변환기
Convert images between PNG, JPEG, and WebP formats. Batch convert multiple files at once. No upload to any server.
Supports JPEG, PNG, WebP, BMP, GIF · up to 50 MB each
How to Convert Images
- Select your target format (JPEG, PNG, or WebP) above.
- Adjust the quality slider for JPEG/WebP output (higher = better quality, larger file).
- Drop or select one or more images.
- Images are converted instantly in your browser.
- Download individually or all at once.
When to Use Each Format
- JPEG · Best for photographs and complex images with many colors. Uses lossy compression for small file sizes. Does not support transparency.
- PNG · Best for graphics, logos, screenshots, and images requiring transparency. Lossless compression means larger files but perfect quality.
- WebP · Google's modern format that provides both lossy and lossless compression. Typically 25-35% smaller than JPEG at equivalent quality. Supports transparency. Supported by all modern browsers.
Common Conversions
- PNG to JPEG · Reduce file size for photos saved as PNG. Great for web pages and email.
- JPEG to PNG · Convert to lossless format for further editing without quality loss.
- PNG/JPEG to WebP · Optimize images for modern websites. Significantly smaller files.
- WebP to PNG/JPEG · Convert for compatibility with older software or platforms that don't support WebP.
Frequently Asked Questions
Does converting between formats lose quality?
Converting to PNG is always lossless. Converting to JPEG or WebP applies lossy compression, but at the default 92% quality setting, the difference is virtually invisible. Lower quality settings trade visual fidelity for smaller file sizes.
What happens to transparency when converting to JPEG?
JPEG does not support transparency. Transparent areas will be filled with a white background. If you need transparency, use PNG or WebP instead.
Can I convert multiple images at once?
Yes! Select or drop multiple images and they will all be converted to your chosen format. Use "Download All" to get them in one click.
Are my images uploaded to a server?
No. All conversion happens in your browser using the Canvas API. Your images never leave your device.