JPG to PNG Converter

Converting JPG to PNG doesn't recover detail JPG's compression already threw away — it can't. What it gets you is a lossless container going forward: transparency support, no further generational quality loss on re-saves, and compatibility with editing tools that expect PNG input. Useful when you're prepping an asset for design work, not when you're just trying to "upgrade" a photo.

JPG vs PNG: what actually changes

• Compression: JPG is lossy (DCT-based); PNG is lossless. Once converted, the PNG won't lose additional quality no matter how many times you re-save it.
• Transparency: PNG supports a full alpha channel; JPG doesn't. A JPG converted to PNG still has no transparency — the background stays solid, since there was nothing to make transparent in the source.
• File size: Expect the PNG to be considerably larger, often 3-10x, since lossless encoding can't compete with JPG's aggressive compression on photographic content.
• When it's worth it: Editing pipelines, print workflows, or upload forms that specifically require PNG. For everyday sharing, keeping the JPG is usually simpler.

PNG's Compression Borrows the Same Algorithm as ZIP Files

PNG doesn't use anything specific to images for its compression — it relies on DEFLATE, the same general-purpose lossless algorithm (created by Phil Katz, also behind the ZIP format) that compresses ordinary files and archives. DEFLATE works by finding and eliminating statistical redundancy in the data — repeated byte sequences, predictable patterns — without discarding anything, which is fundamentally different from JPG's approach of using a discrete cosine transform to selectively throw away visual detail the eye is less likely to notice. It's part of why PNG is reliably lossless but generally can't match JPG's file-size savings on photographic content.

PNG Has Its Own Version of Progressive Loading

Progressive JPEG isn't the only format with a "load blurry, then sharpen" option — PNG has its own equivalent called Adam7 interlacing, named after its creator, Adam M. Costello. Instead of rendering the image top-to-bottom in one pass, an Adam7-interlaced PNG fills in a rough version of the entire image first and then refines it in six additional passes, progressively adding detail across the whole frame at once. It's an optional encoding choice, not something every PNG uses — most converters, including this one, output a standard non-interlaced PNG by default, since the benefit has diminished the same way progressive JPEG's has on fast connections.

How to convert JPG to PNG

1. Upload: Drag and drop your JPG files, or select them manually.
2. Convert: No quality slider needed — PNG output is lossless by definition.
3. Preview: Review the converted files.
4. Download: Individually or as a ZIP for batches.

Frequently Asked Questions