Convert JPG to PNG losslessly. PNG output preserves exact pixel values from the JPG canvas. Useful for editing workflows that need a lossless format. Batch convert up to 10 files with file size comparison.
Click or drag up to 10 JPG or JPEG files. The tool draws each image on a canvas and exports it as a lossless PNG file.
Each file is processed instantly. Note that PNG files will usually be larger than the original JPG, since PNG uses lossless compression and JPG uses lossy compression.
Download each PNG. The pixels are exactly preserved from the JPG decode — no additional quality loss. For editing transparency or backgrounds, the PNG format is now ready for a photo editor.
Converting JPG to PNG does not recover quality lost during JPG compression. The JPG was lossy-compressed when originally saved — those artefacts are baked into the pixel data. PNG simply stores those pixels losslessly. The result looks identical to the JPG but in a lossless container. PNG is useful for further editing without additional quality loss, but does not improve the original JPG quality.
JPG uses lossy compression that typically achieves 10:1 ratios. PNG uses lossless compression (typically 2:1 for photographs). A JPG photo at 500 KB might become a PNG at 3–8 MB. This is expected — you are trading smaller file size for lossless storage. For web use, JPG is almost always the better choice for photographs. PNG excels for graphics, logos, and screenshots.
Convert to PNG when: you need to edit the image in software that saves as a lossy format on every save (avoiding generation loss in your workflow), you need to add a transparent background (PNG supports alpha), the image will be used as a base for further editing or compositing, or you need to embed the image in a PDF or print job that requires lossless data.
No — JPG has no transparency. When you convert JPG to PNG, the PNG canvas has no alpha channel (it is fully opaque). You can then add transparency in a photo editor. Some software incorrectly adds a white background when converting JPG to PNG — this tool preserves the original opaque pixels exactly.
The browser's Canvas toDataURL("image/png") method uses the browser's built-in PNG encoder, typically at a moderate compression level. The resulting PNG is always losslessly identical to the canvas pixels regardless of the compression level — different compression levels produce the same visual output but different file sizes.
For batches of hundreds of files, command-line tools are faster: ImageMagick: mogrify -format png *.jpg. FFmpeg: for i in *.jpg; do ffmpeg -i "$i" "${i%.jpg}.png"; done. Python with Pillow: from PIL import Image; Image.open("photo.jpg").save("photo.png"). This browser tool handles up to 10 files and is best for quick one-off conversions without installing software.
