JPEG 到 PNG 转换器 — 快速免费
JPEG to PNG converts lossy, DCT-compressed photos into PNG with lossless pixel storage, preserving edges and enabling transparency when needed.
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支持所有主要格式
How JPEG to PNG Conversion Works
JPEG Image (JPEG) uses lossy DCT compression that permanently discards fine pixel detail to achieve small file sizes, ideal for photographs. Portable Network Graphics (PNG) uses lossless DEFLATE compression and supports a full alpha-transparency channel, preserving every pixel exactly as encoded. This conversion changes the file's encoding, compression method, and supported feature set. The output is pixel-accurate: no further quality is lost beyond what the source already encoded. The result is a standard PNG file readable by any compatible application. 1converter handles JPEG-to-PNG conversion server-side: files are uploaded over HTTPS, processed on isolated cloud infrastructure, and the converted output is available for download for 24 hours before automatic deletion. No account is required for standard conversions.
Sources & specifications
如何将 JPEG 转换为 PNG
按照以下简单步骤，几秒钟内将 JPEG 文件转换为 PNG 格式
步骤 1
Upload your JPEG file to the converter
步骤 2
Choose PNG output format and confirm any transparency/background options
步骤 3
Convert to generate a lossless PNG file from the JPEG source
步骤 4
Download the resulting PNG to your device
步骤 5
Verify sharpness (text/edges) and transparency in any viewer you use
平均转换时间: 不到2分钟
转换可视化预览
源文件
转换中...
输出文件
此可视化展示了从 JPEG 到 PNG 格式的典型转换过程，包括预期的大小缩减和质量保持。
选择转换质量
为您的 JPEG 到 PNG 转换找到质量与文件大小的完美平衡
低质量
文件最小，基础质量
中等质量
大小与质量平衡
高质量
文件更大，质量出色
最高质量
文件最大，最佳质量
tips_and_updates质量选择技巧
何时使用低/中质量：
- •网页上传和社交媒体分享
- •有大小限制的电子邮件附件
- •快速预览和缩略图
何时使用高/最高质量：
- •专业打印和出版
- •归档和长期存储
- •当质量比大小更重要时
图片提示：中等质量为照片提供最佳平衡。对于带文字的图形，使用高或最高质量以保持清晰度。
为什么要将 JPEG 转换为 PNG？
了解将 JPEG 文件转换为 PNG 格式的优势
Lossless PNG keeps pixel data intact, avoiding JPEG generation artifacts
Better for sharp lines and text than JPEG’s blocky compression
PNG supports alpha transparency for cutouts and overlays
More reliable color fidelity for repeated edits and recompression-free saves
Ideal for screenshots and UI images where exact edges matter
附加功能
热门使用场景
专业人士如何使用我们的 JPEG 到 PNG 转换器
Extracting crisp assets from a saved JPEG for a website header
快速轻松地将 JPEG 转换为 PNG。
Converting a JPEG screenshot to PNG before adding annotations
快速轻松地将 JPEG 转换为 PNG。
Creating transparent logos/cutouts from a JPEG background for compositing
快速轻松地将 JPEG 转换为 PNG。
Preserving quality when editing images in tools that re-save PNGs
快速轻松地将 JPEG 转换为 PNG。
Archiving images that must retain maximum visual detail after edits
快速轻松地将 JPEG 转换为 PNG。
专业人士信赖
Frequently Asked Questions
Everything you need to know about converting JPEG to PNG
Still Have Questions?
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