CONVERT PNG → JPG (PNG to JPG)
Convert PNG images to compressed JPEG format for smaller file sizes on the web.
📈 Target Minimum File Size (Guaranteed ≥ KB)
Lossless JPEG Q100 + standard COM segment padding for government & exam portals
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Automatic format identification and lossless transcoding across 201+ formats.
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EXIF & Color Verification Audit ISO Verified
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GPS Coordinates (37.1773° N, 3.5986° W): Stripped (Zero Location Leak)
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Device Serial & Lens ID: Stripped (EXIF / IPTC / XMP Clean)
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Color Space Profile: Display P3 → sRGB IEC61966-2.1
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Chroma Subsampling: 4:4:4 High Fidelity (Massive size savings for photos)
HOW TO CONVERT PNG → JPG
Upload the PNG
Drop one or many PNGs. The pipeline reads the alpha channel if present.
Flatten and encode
Transparent pixels blend onto a white background; ImageMagick writes a JPEG at q=90.
Download the JPG
A download link appears immediately. Both files auto-delete inside two hours.
Most people reach for this conversion because a PNG has grown unreasonably heavy. PNG stores pixels with lossless DEFLATE compression, so a photograph saved as PNG keeps every subtle gradient byte-for-byte and routinely lands three to five times larger than the same image as JPG. JPG instead uses lossy DCT compression that discards detail your eye barely registers, which is why a 6 MB PNG screenshot of a photo can drop under 1 MB as a JPG with no obvious quality hit. The trade you are making is concrete: PNG's transparent (alpha) channel cannot survive the move, because JPEG has no concept of transparency. Our engine flattens any transparent areas onto a solid white background before encoding, so a logo that floated on nothing will arrive sitting on a white rectangle. You also drop from PNG's optional 16-bit-per-channel depth to JPG's fixed 8-bit, and the re-encode is permanent. For photos, vacation shots, and anything headed to an email attachment, a JPEG upload field, or a size-capped web form, that is a fair deal. Upload, get the JPG, done.
Why convert PNG to JPG
The honest reason is file size on continuous-tone images. A PNG of a photo carries every pixel losslessly, so it bloats; the equivalent JPG is a fraction of the weight while looking nearly identical at normal viewing. Convert when you need to attach a photo to email, satisfy an upload form that rejects PNG or caps size, or shrink a folder of camera-like images for the web. Skip it if the PNG is a logo, icon, screenshot of text, or anything with hard edges and transparency you must keep.
PNG vs JPG — Technical specifications
Side-by-side comparison of the technical details.
PNG
- MIME type
- image/png
- Compression
- Lossless — DEFLATE (zlib)
- Color depth
- 1, 2, 4, 8 or 16 bits per channel
- Max dimensions
- 2^31 − 1 pixels per side (2.1 billion)
- Transparency
- Full 8-bit alpha channel
- Standard
- ISO/IEC 15948:2004
- MIME Type
- image/png
- Extension
- .png
- Category
- Raster & Vector Images
- Full Name
- PNG Image
- Conversion Engine
- IMAGEMAGICK
JPG
- MIME type
- image/jpeg
- Compression
- Lossy — Discrete Cosine Transform + quantization + Huffman coding
- Color depth
- 8 bits per channel (24-bit RGB or 8-bit grayscale)
- Max dimensions
- 65,535 × 65,535 pixels (baseline)
- Transparency
- Not supported
- MIME Type
- image/jpeg
- Extension
- .jpg
- Category
- Raster & Vector Images
- Full Name
- JPEG Image
- Conversion Engine
- IMAGEMAGICK
- Typical quality
- 75–90 for web, 95+ for print
| Specification | PNG | JPG |
|---|---|---|
| MIME type | image/png | image/jpeg |
| Compression | Lossless — DEFLATE (zlib) | Lossy — Discrete Cosine Transform + quantization + Huffman coding |
| Color depth | 1, 2, 4, 8 or 16 bits per channel | 8 bits per channel (24-bit RGB or 8-bit grayscale) |
| Max dimensions | 2^31 − 1 pixels per side (2.1 billion) | 65,535 × 65,535 pixels (baseline) |
| Transparency | Full 8-bit alpha channel | Not supported |
| Standard | ISO/IEC 15948:2004 | — |
| MIME Type | image/png | image/jpeg |
| Extension | .png | .jpg |
| Category | Raster & Vector Images | Raster & Vector Images |
| Full Name | PNG Image | JPEG Image |
| Conversion Engine | IMAGEMAGICK | IMAGEMAGICK |
| Typical quality | — | 75–90 for web, 95+ for print |
PNG vs JPG — Strengths and limitations
What each format does best, and where it falls short.
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
- 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.
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.
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.
Quality & Compatibility
Two things change permanently. First, transparency is gone: JPEG has no alpha channel, so our engine composites transparent pixels onto a white background and flattens the image. If your PNG was on transparency, expect white where it was clear. Second, color depth drops to 8 bits per channel and the DCT pass introduces lossy artifacts around sharp edges and text, more visible at lower quality. PNG's exact pixels and any 16-bit data are not recoverable afterward. EXIF and other metadata are stripped by default for privacy. The sRGB color of typical web PNGs carries over fine.
Tips for Best Results
- If your PNG has transparency you need to keep, do not convert to JPG — the clear areas become a solid white background; choose WebP or keep PNG instead.
- JPG is ideal for photographic PNGs but bad for screenshots of text or sharp-edged graphics, where DCT compression smears edges — those stay smaller and crisper as PNG.
- Files convert in your browser session and outputs are auto-deleted after 60 minutes, and the free tier caps uploads at 25 MB, so download your JPG before the window closes.
Frequently Asked Questions
Yes, JPG uses lossy compression which typically reduces file size by 60-80% compared to PNG, making it ideal for photos and web images where some compression is acceptable.
Yes — JPG is a lossy format, so some information is always discarded. At the default 85 % setting the loss is invisible on photographs but can create halos on text and logos. For graphical content with hard edges, staying on PNG is usually a better call than accepting the JPG artefacts.
Yes — JPG has no alpha channel. Transparent PNG pixels become opaque white in the JPG. If transparency matters, convert to WebP instead, which supports alpha and beats PNG on file size too.
JPG does not support transparency. Any transparent areas in your PNG will be filled with a white background in the resulting JPG file.
JPG has no alpha channel, so transparent pixels must be flattened onto a solid colour. KaijuConverter fills them with white by default; you can pick any hex colour in Advanced. If you rely on the transparency — for overlaying on a coloured page — convert to WebP or AVIF instead, both of which keep alpha and compress photos as well as JPG.
q=90 by default — visually indistinguishable from lossless on photographic content. Advanced exposes the full q=1 to q=100 range; q=80 is a common sweet-spot for web.
Yes, KaijuConverter allows you to set the JPEG quality from 1 to 100. Higher values preserve more detail but produce larger files. We recommend 85 for a good balance of quality and size.
On photos the JPG is typically 5 to 10 times smaller than the PNG. A 10 MB iPhone screenshot of a photo often becomes 900 KB–1.2 MB. On screenshots with large solid areas or text the saving is more modest, usually 2-3x, and the JPG may introduce visible artefacts.
No, usually. JPG compresses text and sharp edges poorly, introducing visible ringing. For UI screenshots keep PNG, which handles flat colour efficiently and losslessly.
Yes. Upload multiple files in a single session on the free tier; each is processed independently so one corrupted file does not stop the rest. For large batches (50+ files) the Pro plan removes throttling, and the REST API lets you automate the process from a script or cron.
PNG and JPG use different metadata containers, but the common fields (EXIF, XMP, IPTC) are mapped across. Camera settings, timestamps and GPS tags survive. tEXt chunks unique to PNG that have no JPG equivalent are dropped, and colour-profile (ICC) data is preserved unless you strip it explicitly.
Technically yes — you can convert back to PNG afterwards — but the JPG compression that happened on the way out cannot be reversed. The resulting PNG will be lossless from that point forward but will still carry whatever JPG artefacts existed. For a clean round-trip, keep the original PNG as your master.
PNG Image
Source formatPNG 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.
JPEG Image
Target formatJPEG 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.
Going the other way? Convert JPG back to PNG with the same engine.
Common Use Cases
Photo emails and chat
A 15 MB PNG becomes a 1.5 MB JPG — fits comfortably in Gmail and WhatsApp without auto-resize.
Web page optimisation
Swap photo PNGs for JPGs to drop LCP by 30-50% on image-heavy landing pages.
Cloud storage savings
Libraries of a thousand screenshots-of-photos shrink from gigabytes to a few hundred MB after JPG conversion.
PNG vs JPG — Typical file sizes
Approximate file sizes for common scenarios.
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
- Phone photo (12 MP, quality 85) 2–5 MB
- Web thumbnail (400px) 20–60 KB
- Full-page magazine photo 500 KB – 2 MB
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Convert thousands of camera RAW files (CR3, NEF, ARW) to WebP, AVIF, or TIFF in one pass.
GPU-accelerated RAW development with end-to-end 16-bit ICC color profile management.
Related comparisons
See these formats side by side to understand which fits your use case best.
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