JPEG PNG Image Compressor

JPEG compression is a lossy process that reduces image file size by discarding visual data the human eye is least sensitive to. The encoder applies a Discrete Cosine Transform (DCT) to blocks of pixels, then quantizes the frequency coefficients based on the quality setting - lower quality means more aggressive quantization and a smaller file. PNG compression, by contrast, is always lossless - it uses zlib DEFLATE encoding to reduce file size without discarding any pixel data. Our JPEG PNG image compressor handles both formats in one tool, letting you compress JPEG and PNG files with a single quality slider.

1. 1Upload your JPEG or PNG files: Drag and drop one or more JPEG/JPG or PNG images onto the drop zone, or click to browse. Use the format selector to filter which file types are accepted. Multiple files are supported.
2. 2Set your quality level: Use the quality slider (1-100) to choose your compression level. Quality 80 is the recommended default for JPEG - it typically reduces file size by 60-80% with minimal visible quality loss. PNG files ignore the slider: they are re-encoded losslessly and kept unchanged if that is not smaller.
3. 3Download your compressed images:Click "Compress & Download". Single files download directly; multiple files are packaged into a ZIP archive. The stats panel shows exact KB saved and compression ratio per file.

• JPEG - DCT Quantization: High-frequency detail (fine textures, sharp edges) is reduced based on the quality setting - the primary driver of JPEG file size reduction.
• JPEG - EXIF Metadata Removal: The re-encoded output strips embedded metadata (GPS, camera model, timestamps), which can save an additional 10-50 KB on photos from modern smartphones.
• PNG - Lossless Re-encoding:PNG files are re-encoded through the browser's Canvas API, which strips ancillary chunks (metadata, color profiles, text annotations) while preserving every pixel exactly.
• Both - Dimensions Preserved: Neither JPEG nor PNG compression changes image dimensions. Width and height remain exactly the same after compression.

Use JPEG compressionfor photographs, product images, and any image with continuous tones and gradients - JPEG's lossy encoding achieves the best size-to-quality ratio for these. Use PNG compressionfor logos, screenshots, illustrations, and images with transparency or sharp edges - PNG's lossless encoding preserves crisp lines and solid colors without introducing compression artifacts. When in doubt, try both and compare the output sizes using our JPEG PNG image compressor.