PNG to JPG Converter

PNG (Portable Network Graphics) uses lossless compression—every pixel is stored and reproduced exactly. JPEG (Joint Photographic Experts Group) uses lossy compression—it discards some image information to achieve significantly smaller file sizes. Converting PNG to JPEG involves re-encoding the PNG pixel data using JPEG's DCT (Discrete Cosine Transform) compression algorithm.



This tool loads the PNG into an HTML Image element, draws it onto an HTML5 Canvas, then exports the canvas content as JPEG using canvas.toBlob() with the 'image/jpeg' MIME type and a quality parameter from 0 to 1. The quality parameter controls the compression ratio: 0.95 produces high-quality output with modest size reduction; 0.7 produces significant size reduction with minor visible quality loss.



Important: PNG supports full transparency (alpha channel), but JPEG format does not. Transparent pixels in PNG are filled with a background color (default white) during the conversion. If your PNG has meaningful transparent areas, consider the visual impact before converting.

1. Reducing File Size for Web Use
PNG screenshots and exports are often 2-5x larger than equivalent JPEGs. For photographs or complex graphics where lossless quality isn't critical, PNG to JPEG conversion significantly reduces file size. A 1.5MB PNG photograph might convert to a 150KB JPEG at 85% quality, achieving 10x size reduction.



2. Email and Messaging Attachments
PNG files are often larger than necessary for sharing via email or messaging apps where the recipient won't edit the image further. Converting to JPEG reduces upload and download time and keeps under attachment size limits, especially for high-resolution photos saved as PNG.



3. Website Performance Optimization
Pages with PNG images that don't require transparency (photographs, colorful backgrounds, complex illustrations) can load faster after converting to JPEG. Replacing PNG with JPEG for appropriate images is a standard performance optimization that reduces page weight and improves Core Web Vitals scores.



4. Social Media Upload Preparation
Some social media platforms compress PNGs significantly when uploading, producing poor results. Pre-converting to JPEG with controlled quality settings gives you more predictable results than platform auto-compression.



5. Print Workflow Compatibility
Some print workflows and older print software handle JPEG more reliably than PNG. Converting PNG assets to JPEG ensures compatibility with print systems that may not fully support PNG transparency or color profiles.

• Don't convert PNGs with transparency: If your PNG uses transparency for overlays, UI elements, or logos on colored backgrounds, converting to JPEG will fill transparent areas with white (or another background color). Transparency is a key reason to use PNG, so converting destroys that benefit.



• Quality 80-90% is usually optimal: At 80-90% JPEG quality, most photographs are visually indistinguishable from 100% quality at roughly 1/3 to 1/5 the file size. Below 70%, JPEG artifacts become visible around edges and in smooth gradients.



• Avoid PNG→JPEG for screenshots with text: Screenshots containing text and UI elements use sharp edges that JPEG handles poorly—text becomes blurry with visible compression artifacts. PNG's lossless compression is preferred for screenshots.



• Keep originals: JPEG conversion is lossy and irreversible—pixel data is permanently discarded. Always keep your original PNG files as masters and treat converted JPEGs as derived copies for specific use cases.