๐ Image Format Converter
Convert between PNG, JPG, and WebP โ your files never leave your browser
Drag & drop images here
or click to browse โ JPG, PNG, WebP
Understanding Image Formats
Choosing the right image format affects file size, quality, and compatibility. Here's what you need to know about the three most common web image formats.
JPG (JPEG) โ The Photo Standard
JPG uses lossy compression based on Discrete Cosine Transform (DCT). It's designed for photographs and complex images with many colors and gradients. JPG does not support transparency.
- Best for: Photographs, gradients, complex images
- Compression: Lossy โ some data is discarded every save
- Transparency: Not supported
- Typical size: Small (lossy compression)
PNG โ Lossless Quality
PNG uses lossless DEFLATE compression. It preserves every pixel perfectly and supports alpha transparency. The trade-off is larger file sizes for photographic content.
- Best for: Screenshots, logos, graphics with text, images with transparency
- Compression: Lossless โ no quality loss
- Transparency: Full alpha channel support
- Typical size: Large for photos, small for simple graphics
WebP โ The Modern Format
WebP, developed by Google, supports both lossy and lossless compression, plus transparency. It typically produces 25-35% smaller files than JPG at equivalent quality, and smaller than PNG for the same content.
- Best for: Web images where size matters
- Compression: Both lossy and lossless
- Transparency: Supported
- Typical size: Smallest of all three formats
How Canvas API Conversion Works
This tool uses the browser's Canvas API to convert between formats. The process is:
The toBlob() method encodes the canvas pixel data into the specified MIME type with the given quality parameter. When converting PNG โ JPG, transparent pixels are composited onto a white background since JPG doesn't support alpha channels.
Step-by-Step Guide
- Upload images โ Drag and drop or click to select files in JPG, PNG, or WebP format.
- Choose target format โ Select PNG, JPG, or WebP as the output format.
- Adjust quality โ For JPG and WebP, adjust the quality slider (not applicable for PNG, which is always lossless).
- Click Convert All โ All uploaded images are converted to the target format.
- Download โ Download individual files, all files, or as a ZIP archive.
Frequently Asked Questions
JPG does not support transparency. When converting a PNG with transparent areas to JPG, this tool automatically fills transparent regions with a white background. If you need to preserve transparency, use WebP or PNG as the output format.
WebP typically produces the smallest files โ 25-35% smaller than JPG at the same quality, and much smaller than PNG for photos. PNG is best for graphics with sharp edges, text, or few colors where lossless compression excels.
No. Converting JPG to PNG preserves the existing quality but does not improve it. The JPG artifacts remain. However, PNG prevents further quality loss if you edit and save the image again, since PNG is lossless.
There's no server-side limit since everything runs in your browser. However, very large images may be limited by your device's available memory. For best performance, keep individual images under 20MB.