JPG vs PNG
A detailed comparison of JPEG Image and PNG Image — file size, quality, compatibility, and which format to choose for your workflow.
Short answer: use JPG for photos, PNG for logos/screenshots/UI. JPG can be 5–20× smaller for the same photo, but PNG is the only format that supports true transparency and survives unlimited re-saves with zero quality loss. Below: the numbers, the use-cases, and why even pros mix both.
JPG vs PNG at a glance
| Dimension | JPG | PNG |
|---|---|---|
| Compression | Lossy (DCT) | Lossless (DEFLATE) |
| File size (1080p photo) | ~250-700 KB | ~2-5 MB |
| Transparency | No (8-bit RGB only) | Yes (8/24/32-bit alpha) |
| Best for | Photos, gradients | Logos, screenshots, UI |
| Color depth | 24-bit (16.7M colors) | Up to 48-bit |
| Year released | 1992 | 1996 |
| Browser support | Universal | Universal (since IE5+) |
| Re-saving losses | Generation loss each save | No degradation |
When should you use JPG vs PNG?
JPG Use when…
Pick JPG when bandwidth and file size matter more than pixel-perfection: holiday photos, product catalog images, social media uploads, blog hero images, anything destined for an <img> tag in a high-traffic context. JPG's lossy compression discards visual data your eye barely notices, often hitting ratios of 10:1 vs raw at quality settings of 85+. Avoid JPG for anything you'll re-edit (each save degrades it) or anything with hard edges and flat color (artifacts become visible).
PNG Use when…
Pick PNG when you need transparency, crisp lines, or lossless quality: logos, icons, UI mockups, screenshots, infographics, anything with text overlays. PNG's DEFLATE compression preserves every pixel exactly — re-save 1000 times and the file is identical. The trade-off is size: a screenshot that's 80 KB as PNG might be 8 KB as JPG. Use PNG-8 (palette) for simple graphics with ≤256 colors to shrink files dramatically.
Best format by use case
Photography
Smooth gradients compress 5-20× smaller in JPG with no visible loss
Winner: JPGLogos & icons
PNG preserves sharp edges and supports transparency
Winner: PNGScreenshots
PNG handles UI text and flat color blocks without artifacts
Winner: PNGBlog hero images
Page-load speed matters; JPG quality 85 looks identical at 1/10 the size
Winner: JPGRe-editable artwork
JPG degrades with every save; PNG is bit-perfect across saves
Winner: PNGPrint-ready output
PNG lossless preserves details for high-DPI printing
Winner: PNGJPEG Image
Raster & Vector ImagesJPEG is the most widely used lossy image format on the web. It achieves small file sizes through adjustable compression, making it ideal for photographs and complex images where some quality loss is acceptable.
About JPG filesPNG Image
Raster & Vector ImagesPNG is a lossless image format that supports transparency. It is ideal for graphics, logos, screenshots, and any image where preserving exact pixel data is important.
About PNG filesStrengths Comparison
JPG Strengths
- Excellent compression ratio for photographs (10:1 or better without visible quality loss).
- Universal support — every camera, phone, OS, and browser reads JPEG natively.
- Adjustable quality setting balances file size against visual fidelity.
- Embeds EXIF metadata (camera model, GPS, exposure) automatically.
- Progressive rendering for graceful loading over slow networks.
PNG Strengths
- Lossless compression — every save preserves the original pixels perfectly.
- Full 8-bit alpha channel for smooth transparency.
- Excellent for text, UI screenshots, logos, and line art.
- Royalty-free and an ISO standard (ISO/IEC 15948).
- Supports 16-bit color depth for high-fidelity work.
Limitations
JPG Limitations
- Lossy — every save degrades the image further (generation loss).
- No transparency channel (use PNG or WebP for that).
- Visible compression artifacts on text, sharp edges, and flat colors.
- Limited to 8 bits per channel — poor for HDR or print work.
- Baseline JPEG tops out at 65,535 × 65,535 pixels.
PNG Limitations
- Much larger than JPEG for photographs (no perceptual compression).
- No native animation in most software (APNG support is inconsistent).
- No CMYK support — web and screen only, not print.
- Metadata capabilities are less rich than JPEG's EXIF.
Technical Specifications
| Specification | JPG | PNG |
|---|---|---|
| MIME type | image/jpeg | image/png |
| Compression | Lossy — Discrete Cosine Transform + quantization + Huffman coding | Lossless — DEFLATE (zlib) |
| Color depth | 8 bits per channel (24-bit RGB or 8-bit grayscale) | 1, 2, 4, 8 or 16 bits per channel |
| Max dimensions | 65,535 × 65,535 pixels (baseline) | 2^31 − 1 pixels per side (2.1 billion) |
| Transparency | Not supported | Full 8-bit alpha channel |
| Typical quality | 75–90 for web, 95+ for print | — |
| Standard | — | ISO/IEC 15948:2004 |
Typical File Sizes
JPG
- Phone photo (12 MP, quality 85) 2–5 MB
- Web thumbnail (400px) 20–60 KB
- Full-page magazine photo 500 KB – 2 MB
- Social-media square (1080×1080) 100–400 KB
PNG
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
- Print-ready illustration 5–50 MB
Technical deep dive: JPG vs PNG
The compression difference, demystified. JPG uses Discrete Cosine Transform (DCT) — it converts 8×8 pixel blocks into frequency components, then discards high-frequency data your visual system barely registers. At quality 85, you typically lose 80–95% of the file size with negligible perceptual loss in photos. The catch: each save re-applies the lossy step, so editing a JPG and re-saving 10 times leaves visible blur and color shifts ("generation loss").
PNG uses DEFLATE (the same algorithm as ZIP) — it never discards data, only compresses redundant patterns. A flat-color logo with 4 colors might compress 50:1; a noisy photo only 1.5:1, which is why photos in PNG balloon to 5–10× the JPG size. PNG also supports an alpha channel (transparency), which JPG fundamentally cannot: a JPG either has a white background or whatever color the encoder chose.
When transparency forces your hand. If you need anti-aliased edges over a non-white background — UI icons, web mockups, marketing graphics — PNG is mandatory. JPG will fill the alpha with white and create ugly halos. Modern formats like WebP and AVIF combine the best of both (lossy/lossless modes + alpha), and we recommend trying JPG → WebP or PNG → WebP for ~30–50% smaller files at equivalent quality.
The 2026 verdict. For 90% of web work: JPG for photos at quality 80–85, PNG for everything with transparency or hard edges. For the bleeding edge: WebP for both, with JPG/PNG fallback via <picture>. Avoid PNG-24 for photos (massive files) and avoid JPG for anything you'll re-edit.
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Frequently Asked Questions
For photos, yes — typically 5–20× smaller. For logos and screenshots, often the opposite: PNG can be smaller because it compresses flat colors and repeated patterns more efficiently than JPG.
No. Once data is discarded by JPG compression, converting to PNG cannot recover it. The PNG will be larger but visually identical to the JPG.
Yes — PNG supports both 1-bit (binary) and 8-bit (256-level) alpha channels. JPG does not support transparency at all.
JPG re-applies its lossy DCT compression on every save (\"generation loss\"). Edit and save as PNG to preserve quality, then export final to JPG once.
Use JPG for content photos and PNG for UI elements with transparency. Better still, serve WebP or AVIF with JPG/PNG fallback via the `<picture>` tag.
WebP combines lossy + lossless modes with alpha, typically 25–35% smaller than JPG/PNG at equivalent quality. Universal browser support since 2020.
JPG (JPEG) is the most widely used image format, developed by the Joint Photographic Experts Group in 1992. It uses lossy compression to achieve small file sizes, making it the standard for digital photography, web images, and social media.
JPG files can be opened by virtually any image viewer or editor, including Windows Photos, macOS Preview, Adobe Photoshop, GIMP, and all web browsers.