Overview
This guide compares JPG and PNG across the most important criteria to help you choose the right format for your needs.
JPG is best for photographs; PNG is best for graphics with transparency or text.
Head-to-Head Comparison
File Size
JPG: JPG is much smaller for photos due to lossy compression.
PNG: PNG is lossless and larger but necessary for graphics with transparency.
Winner: JPG
Quality
JPG: JPG loses quality each time it is saved due to lossy compression.
PNG: PNG is lossless - no quality loss on save.
Winner: PNG
Transparency
JPG: JPG does not support transparency.
PNG: PNG supports full alpha channel transparency.
Winner: PNG
Best For
JPG: Best for photographs and complex images with millions of colors.
PNG: Best for logos, icons, screenshots, and images with sharp edges.
Winner: Tie
Web Use
JPG: JPG loads faster for photos - better for page speed.
PNG: PNG is larger but necessary when transparency is needed.
Winner: JPG
How JPG and PNG Differ Technically
JPG (JPEG) is built around a lossy, block-based transform: the encoder splits the image into 8x8 pixel blocks, applies a discrete cosine transform (DCT) to convert spatial pixels into frequency coefficients, and then quantizes those coefficients, discarding the high-frequency detail the human eye is least sensitive to.[1] This makes JPG extremely efficient for continuous-tone photographs but introduces irreversible artifacts. PNG takes the opposite approach: it is fully lossless, storing every pixel exactly. It uses the DEFLATE algorithm (LZ77 dictionary matching plus Huffman coding), preceded by per-row prediction filters that improve compressibility without altering the data.[3][4]
Color, Transparency, and Fidelity
JPG encodes in the YCbCr color space and typically subsamples chrominance (often 4:2:0), reducing color resolution to save space, and it has no alpha channel.[2] PNG supports full 8- or 16-bit-per-channel color and a true alpha channel for variable transparency, which is why it is the standard for logos, screenshots, and images placed over varied backgrounds.[3] Because PNG preserves sharp edges and flat color regions perfectly, it avoids the ringing and blocking that JPG produces around text and hard lines.
When Each Format Wins
For photographs and complex natural scenes, JPG's perceptual compression yields far smaller files at visually acceptable quality, which is why it dominated web photography for three decades.[1] PNG wins wherever exact reproduction, transparency, or repeated re-editing matters, since lossless storage means no generational quality loss. The trade-off is file size: a lossless PNG of a photograph is usually several times larger than an equivalent JPG.
Convert Between JPG and PNG
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Convert Files NowFrequently Asked Questions
When should I use JPG vs PNG?
Use JPG for photographs and complex images. Use PNG for logos, screenshots, icons, or anything needing transparency.
Does PNG support transparency?
Yes, PNG fully supports alpha channel transparency. JPG does not support transparency at all.
Which is better for web use?
JPG is better for photos (smaller files). PNG is necessary for transparent graphics. WebP is ideal for both.
Can I convert JPG to PNG without quality loss?
No, converting JPG to PNG cannot recover quality already lost during JPG compression.
Is PNG or JPG better for printing?
PNG is generally better for printing graphics and logos. For photographs, either works well at high resolution.