WebP to PNG Converter

This tool solves the compatibility gap between modern web standards and legacy systems by transcoding WebP raster data into the universally accepted PNG format. While WebP offers superior compression using predictive coding, many older image editors, email clients, and operating systems fail to render the RIFF container structure.

The converter operates by decoding the VP8/VP8L bitstream into a raw bitmap buffer within the browser's memory. It then re-encodes this data using the DEFLATE algorithm - a lossless data compression sequence that combines LZ77 and Huffman coding - ensuring that every pixel's RGBA value remains mathematically identical to the source. This process guarantees zero generation loss during the format migration.

The conversion process relies on the lossless mapping of the pixel matrix. For an image with width w and height h, the transformation function T maps every coordinate x, y from the source space S to the target space D.

Where A represents the Alpha channel (transparency). Since PNG uses lossless DEFLATE compression, the equality holds true:

The file size S typically follows the relationship S_png > S_webp due to the lower entropy efficiency of the older DEFLATE algorithm compared to VP8 prediction models.