Measured output sizes for exact-file-size image compression

This dataset records the measured output byte sizes produced by CrunchImage's browser-side image compressor across a fixed set of exact file-size targets (20 KB, 50 KB, 100 KB, 200 KB, 500 KB, 1 MB, 2 MB and the neighbouring tiers the site publishes). Each row pairs an input file (format, pixel dimensions, source bytes) with the resulting output (dimensions, bytes, quality setting) so the ceiling behaviour can be checked rather than assumed. The files cover alpha-channel handling, format conversion at a fixed byte budget, and quality-matched encoding comparisons that the compression pages describe in prose. All values were read from the tool's own output panel at https://crunchimage.com; no third-party benchmark figures are included.