Convert JPEG to PNG
Switch from lossy JPEG to lossless PNG. Perfect for preserving quality in future edits.
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JPEG, PNG, WebP, AVIF up to 50MB each
JPEG to PNG: Lossless Conversion
Quality Preservation
PNG is lossless — once converted, no further quality loss occurs during editing or re-saving.
File Size
PNG files are larger than JPEG. Convert when quality preservation matters more than file size.
Use Cases
Image editing, screenshots, graphics with text, and archival storage.
Transparency
PNG supports transparency, which JPEG does not. Useful for future graphic design work.
Why Switching from JPEG to PNG Preserves What Lossy Compression Destroyed
The JPEG standard, finalized in 1992 by the Joint Photographic Experts Group, was revolutionary for its era but introduced permanent quality loss through discrete cosine transform (DCT) compression. Every time a JPEG is saved, quantization discards high-frequency detail — fine text, sharp edges, and subtle gradients suffer most. Converting to PNG freezes the image at its current quality level, preventing further degradation. This matters enormously when a file will be edited multiple times before final delivery.
PNG uses DEFLATE lossless compression, which means every pixel in the converted file is mathematically identical to the source. For screenshots, UI mockups, and technical diagrams, this distinction is critical. A typical 1920x1080 screenshot saved as JPEG at quality 80 weighs around 180 KB but shows visible artifacts around text. The same image as a 24-bit PNG may reach 400-600 KB, yet every character remains pixel-perfect — a worthwhile trade-off for any document destined for print or presentation.
The JPEG specification originally defined both .jpeg and .jpg extensions due to the three-character limit in MS-DOS and early Windows FAT file systems. While modern operating systems treat them identically, many legacy CMS platforms and batch-processing scripts still expect one or the other. Converting to PNG sidesteps this ambiguity entirely, since .png has been universal across every major operating system since the format's adoption by the W3C in 1996.
Alpha channel support is arguably the most practical reason to move from JPEG to PNG. JPEG has no concept of transparency — the format simply cannot store it. If you need a product photo on a transparent background for an e-commerce listing or a logo overlay for video editing, PNG is the only lossless option with full 8-bit alpha. Krunkit handles this conversion entirely in your browser using WASM, so no pixel data ever leaves your device.
Pro Tips
Use PNG-8 for simple graphics to cut file size by 60-80%
If your converted image has fewer than 256 colors — common with logos, icons, and flat illustrations — opt for PNG-8 instead of PNG-24. A typical 500x500 icon drops from 45 KB to under 10 KB with zero visible difference.
Convert before editing, not after
Each JPEG save cycle introduces additional artifacts through re-quantization. Convert your JPEG to PNG first, perform all edits on the lossless file, then export to whatever delivery format you need. This preserves maximum quality throughout your workflow.
Check for JPEG artifacts before converting
Converting a heavily compressed JPEG (quality 30-50) to PNG preserves existing block artifacts permanently. If the source JPEG shows visible 8x8 pixel blocks, consider using an AI upscaler or denoiser before converting, rather than locking in the damage as lossless PNG data.
Frequently Asked Questions
Is JPEG the same as JPG?
Yes. JPEG and JPG are the same format — JPG is just a shorter file extension from the DOS era's 3-character limit.
Will converting JPEG to PNG improve quality?
It won't restore quality lost in JPEG compression, but it prevents any further loss in future edits.
Why is the PNG file so much larger?
PNG uses lossless compression which preserves all data. JPEG achieves smaller sizes through lossy compression that discards some data.
Is this converter private?
Yes. All conversion happens in your browser. No images are uploaded to any server.