Convert JPG to PNG Online - Free, Local & Instant
Convert JPG (image/jpeg) to Lossless RGBA PNG (.png) locally in your browser using HTML5 Canvas. Adjust compression quality, resize in pixels, and download instantly with zero server uploads.
Technical Comparison: JPG vs PNG
Images & Game/Web Assets| Specification | JPG (Source) | PNG (Target) |
|---|---|---|
| Format Name | JPEG Photographic Image | Lossless RGBA PNG |
| MIME Type | image/jpeg | image/png |
| Transparency / Alpha | No (opaque RGB) | Preserved for PNG, WEBP, AVIF, ICO, SVG, BMP |
| Compression Profile | Lossy DCT photographic | pixel-perfect lossless graphics with full alpha transparency |
| Processing Engine | Native Browser Image Decoder | HTML5 Canvas + Client-Side Binary Encoder |
JPG to PNG — Before & After Example
Input File: asset.jpg MIME Type: image/jpeg Alpha: No (opaque RGB) Compression: Lossy DCT photographic Decoding: Browser HTML5 Image + Canvas 2D Context
Output File: converted.png MIME Type: image/png Pipeline: High-quality bicubic Canvas resampling -> Blob download Best For: pixel-perfect lossless graphics with full alpha transparency
Frequently Asked Questions: JPG to PNG
Does converting JPG to PNG upload my images to a remote server? ▾
Never. Every JPG file you select is decoded directly in your browser using the HTML5 Canvas API and FileReader API. Your images stay in your computer or phone RAM at all times.
Can I resize and adjust compression quality when converting JPG to PNG? ▾
Yes. Use the Quality slider (10%–100%) and the Width/Height pixel inputs above the drop zone. Keeping "Lock Ratio" checked preserves your original aspect ratio automatically.
Does this converter support batch JPG to PNG conversion with ZIP download? ▾
Yes. Drag and drop multiple JPG files at once; you can download each converted PNG individually or click "Download All (.ZIP)" to bundle them locally via JSZip.
Why use PNG instead of JPG? ▾
Converting JPG to PNG gives you pixel-perfect lossless graphics with full alpha transparency while keeping full control over pixel dimensions and byte size.