CONVERT JPG → PNG (JPG to PNG)
Convert JPEG photos to lossless PNG format, preserving quality and adding transparency support.
📈 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 (High-fidelity algorithmic conversion)
HOW TO CONVERT JPG → PNG
Upload your JPG
Drag a JPG or JPEG file (up to 25 MB free (up to 2 GB with Kaiju Cloud) free) into the uploader. Multiple files are queued automatically.
PNG is pre-selected
We detect the pair and default to PNG with lossless settings. No knobs to turn unless you want to resize.
Download the PNG
Conversion runs in the cloud in a few seconds. Hit download, or save straight to Google Drive / Dropbox.
JPG stores photos as 8×8 pixel blocks run through a discrete cosine transform, then throws away the high-frequency detail your eye is least likely to miss. That works beautifully for a sunset and terribly for a screenshot: the moment a JPG meets a hard edge — black text on white, a UI button border, a logo outline — those blocks produce a halo of grey speckle called ringing. Converting JPG to PNG stops that bleed from getting worse. PNG uses DEFLATE compression that is fully lossless, so every pixel the JPG handed over is written back byte-for-byte, and from this point on you can crop, recolour or annotate the file as many times as you like without stacking another round of artefacts. The other reason people make this switch is the alpha channel: PNG carries true per-pixel transparency, which JPG simply cannot represent. Drop a JPG above and KaijuConverter re-encodes it with ImageMagick over an encrypted connection, keeps your resolution and colour intact, and wipes both files within the hour. No account, no email.
Why convert JPG to PNG
JPG is generational and lossy: every re-save runs the discrete cosine transform again, so a photo edited several times grows steadily mushier and gains more 8×8 block ringing around hard edges. Moving to PNG freezes the file at its current quality, because DEFLATE compression is lossless and costs nothing on subsequent saves. That matters most for content JPG handles badly: screenshots with small text, charts, diagrams, comics, pixel art and logos, where the blocky compression smears outlines that PNG keeps razor-sharp. The switch is also the correct first step before adding transparency, since PNG can hold a real alpha channel and JPG cannot. For ordinary photographs none of this helps and the PNG will simply be much heavier.
JPG vs PNG — Technical specifications
Side-by-side comparison of the technical details.
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
- Typical quality
- 75–90 for web, 95+ for print
- MIME Type
- image/jpeg
- Extension
- .jpg
- Category
- Raster & Vector Images
- Full Name
- JPEG Image
- Conversion Engine
- IMAGEMAGICK
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
- MIME Type
- image/png
- Extension
- .png
- Category
- Raster & Vector Images
- Full Name
- PNG Image
- Conversion Engine
- IMAGEMAGICK
- Standard
- ISO/IEC 15948:2004
| 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 | — |
| MIME Type | image/jpeg | image/png |
| Extension | .jpg | .png |
| Category | Raster & Vector Images | Raster & Vector Images |
| Full Name | JPEG Image | PNG Image |
| Conversion Engine | IMAGEMAGICK | IMAGEMAGICK |
| Standard | — | ISO/IEC 15948:2004 |
JPG vs PNG — Strengths and limitations
What each format does best, and where it falls short.
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.
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.
Quality & Compatibility
The re-encode is mathematically lossless, but lossless from where you are now — PNG cannot rebuild detail the JPG already discarded, so existing block artefacts and colour banding around hard edges remain visible. Colour is copied as standard 8-bit-per-channel RGB (24-bit), the same depth JPG uses, so nothing is gained or lost there. No alpha channel is created: a JPG has no transparency to carry over, so the PNG is fully opaque until you remove a background separately. Any embedded ICC colour profile and EXIF block (camera, date, GPS) are preserved into PNG's eXIf/iTXt chunks unless you choose to strip them.
Tips for Best Results
- Start from the highest-resolution, least-compressed JPG you have — re-saving an already-tiny JPG as PNG just locks in the existing artefacts inside a much larger file.
- If your goal is a transparent cut-out, convert to PNG first, then remove the background in an editor like Photopea — the format change alone adds no alpha channel.
- For UI icons and screenshots, run the resulting PNG through oxipng or pngquant afterwards; lossless re-optimisation often trims 20–40% with zero visible change.
Frequently Asked Questions
Yes, KaijuConverter offers free JPG to PNG conversion with no registration required. You can convert files up to 25 MB at no cost.
No. PNG is a lossless container, so nothing new is added — it simply stops losing more detail from that point on. Any block artefacts, colour banding or smeared text already baked into the JPG will still be visible in the PNG. The benefit is future-proofing: every subsequent save will keep exactly what you see in the PNG instead of re-compressing it.
Converting from JPG to PNG will not improve the original image quality because data lost during JPG compression cannot be recovered. However, PNG uses lossless compression so no further quality is lost after conversion.
Almost always, yes. A typical photo JPG at 80 % quality is 3 to 5 times smaller than the equivalent PNG, because JPG throws away detail the eye does not notice while PNG keeps every pixel. For screenshots, diagrams or flat illustrations the gap narrows — PNG can even beat JPG on images with large solid areas.
Free users can convert files up to 25 MB. For larger files, consider our premium plan which supports files up to 500 MB.
Converting the format alone cannot add transparency — the source JPG has no alpha information to restore. After the conversion you can remove the background in a tool like Photopea, Photoshop or remove.bg and re-save as PNG. The result will have a real alpha channel that any editor or browser can use.
No. JPG does not support transparency, so the converted PNG will retain the original background. You would need an image editor to remove the background after conversion.
KaijuConverter uploads over HTTPS, processes the file in an isolated container, and deletes both the source and the output automatically within two hours. We never look at file contents, share them with third parties or use them for training. No account or email is required, so there is no long-term record tying the file to you.
The free tier accepts files up to 25 MB each and queues multiple uploads in one session. Paid plans unlock larger files and parallel batch conversion. For very large batches (hundreds of files) the API is usually a better fit than the web UI because it runs unattended.
Yes by default. PNG has an equivalent metadata container (iTXt/eXIf chunks) and KaijuConverter copies the EXIF, IPTC and XMP blocks across so camera settings, timestamps and GPS tags survive the conversion. Tick the "strip metadata" option in Advanced if you plan to publish the file and do not want to leak location data.
JPEG Image
Source 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.
PNG Image
Target 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.
Going the other way? Convert PNG back to JPG with the same engine.
Common Use Cases
Screenshots that stay sharp
JPG smears text in screenshots; PNG keeps it pixel-perfect so bug reports, documentation and tutorial images remain legible at 100 % zoom.
Logos and product shots
Product photos cut out on white look crisper as PNG, and the format is ready for a transparent background once you mask out the subject.
Master copies for editing
If you plan to crop, retouch or colour-grade later, working from a PNG avoids stacking JPG artefacts every time you save.
Platforms that require PNG
Some submission systems (stamp art, chat-sticker platforms, Apple touch icons) reject JPG outright and demand PNG.
JPG vs PNG — Typical file sizes
Approximate file sizes for common scenarios.
- Phone photo (12 MP, quality 85) 2–5 MB
- Web thumbnail (400px) 20–60 KB
- Full-page magazine photo 500 KB – 2 MB
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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