JPEG vs PNG
Szczegółowe porównanie JPEG Image i PNG Image — rozmiar pliku, jakość, kompatybilność oraz wybór odpowiedniego formatu do Twojej pracy.
JPEG Image
Raster & Vector ImagesJPEG alternate extension. Functionally identical to JPG but uses the four-letter extension. Some older systems and cameras produce files with this extension.
O plikach JPEGPNG 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.
O plikach PNGPorównanie zalet
JPEG Zalety
- Universally supported — every camera, browser, OS, and editor reads JPEG.
- Mature, deterministic, and fast to encode/decode.
- Small file sizes for photographs — DCT compression shines on continuous-tone imagery.
- Rich metadata ecosystem (EXIF for shooting data, XMP for editing, IPTC for captions).
- Progressive variant enables perceived faster loading on slow networks.
PNG Zalety
- 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.
Ograniczenia
JPEG Ograniczenia
- Lossy by design — every save further degrades quality ("generation loss").
- No transparency channel. Logos and UI elements belong in PNG or WebP.
- Terrible on flat colors, text, and sharp edges — blocking artifacts are visible.
- Limited to 8-bit color — HDR and wide gamut need JPEG XL or AVIF.
- Twice the size of WebP and 30-50% bigger than AVIF at comparable quality.
PNG Ograniczenia
- 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.
Specyfikacja techniczna
| Specyfikacja | JPEG | PNG |
|---|---|---|
| MIME type | image/jpeg | image/png |
| File extensions | .jpg, .jpeg, .jpe, .jfif | — |
| Standard | ITU-T T.81 / ISO/IEC 10918-1:1994 | ISO/IEC 15948:2004 |
| Compression | Lossy DCT (baseline); lossless mode exists but rarely used | Lossless — DEFLATE (zlib) |
| Color depth | 8-bit per channel (24-bit RGB total) | 1, 2, 4, 8 or 16 bits per channel |
| Max dimensions | 65 535 × 65 535 px | 2^31 − 1 pixels per side (2.1 billion) |
| Transparency | — | Full 8-bit alpha channel |
Typowe rozmiary plików
JPEG
- Thumbnail (400px) 20-60 KB
- Web photo (1920px) 200-500 KB
- Print-quality photo (3000px) 1-4 MB
- DSLR JPEG (24 MP, quality 95) 6-12 MB
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
Gotowy do konwersji?
Konwertuj między JPEG a PNG online, za darmo i bez instalowania czegokolwiek. Szyfrowane przesyłanie, automatyczne usuwanie po 60 minutach.
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Często zadawane pytania
JPEG (Joint Photographic Experts Group) is the most widely used image format on the web, standardized in 1992. It uses lossy compression optimized for photographs, discarding visual information the human eye barely notices to achieve 10-20× smaller files than raw bitmaps. The .jpg and .jpeg extensions refer to the same format — the difference is purely historical.
JPEG files open natively on every operating system and device since 1995. Windows Photos, macOS Preview, every web browser, Photoshop, GIMP, and smartphone galleries all read JPEG without any additional software.
Use the JPEG-to-PNG converter on KaijuConverter — upload the JPEG and download a PNG copy. Keep in mind PNG will be larger (often 3-5×) because JPEG is lossy while PNG is lossless, but PNG preserves sharper edges and supports transparency.
They are exactly the same format. JPEG is the official committee name; .jpg became the common extension because early Windows systems only allowed 3-character file extensions. Every tool treats them identically.
JPEG uses lossy compression — each save recompresses the image, accumulating subtle artifacts. This is called generation loss. To preserve quality across edits, work in PNG or TIFF and export to JPEG only for the final delivery.
JPEG remains the universal default because every device supports it. Modern formats (WebP, AVIF, JPEG XL) offer 30-50% smaller files at equivalent quality, but compatibility is not yet universal. For maximum reach use JPEG; for web delivery with modern browsers, consider WebP or AVIF.