在线免费JPG转PNG转换器

PNG supports lossless compression and transparent backgrounds, making it better for logos, screenshots, and images with text or hard edges. If you're editing an image further, PNG preserves quality through multiple save cycles whereas JPEG degrades each time.

No. Converting from JPEG to PNG stops further quality loss, but it cannot recover detail already lost during the original JPEG compression. If the JPEG looks fine, the PNG will look identical — just larger in file size.

No. The conversion runs entirely in your browser using the Canvas API. Your file never leaves your device and nothing is stored or transmitted to any server.

JPEG uses lossy compression optimised for photos, achieving very small file sizes. PNG uses lossless compression, which preserves every pixel exactly — this results in larger files. PNG's advantage is quality retention and transparency support, not smaller size.

Currently the tool processes one image at a time. To batch convert, use each image in sequence — clear the previous result, drop the next file, and download. For large batches, a desktop tool like ImageMagick or XnConvert is more efficient.

Yes, the JPG转PNG转换器 on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

无损地将JPG图像转换为PNG格式。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The JPG转PNG转换器 runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The JPG转PNG转换器 processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the JPG转PNG转换器 works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

The JPG转PNG转换器 works with common image formats supported by your browser, including JPEG, PNG, WebP, and GIF. SVG support varies by tool. No format conversion plugin or driver is needed.

Yes. The JPG转PNG转换器 processes files entirely in your browser using the Canvas API. Very large files (over 20 MB) may take a few extra seconds on older or lower-powered devices. Closing other tabs can free up memory for better performance.

Yes. The JPG转PNG转换器 is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.