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Compressed 65 catalog photos from 164 to 11 MB without changing file names or store links

Industry: Furniture manufacturerService: SEO and content

164 → 11 MBtotal size of 65 files

65 of 65return a 200 response and are under 400 KB

SSIM 0.96-0.99on a sample compared with the originals, with no visible loss

I need something similar

Before

Product gallery photos were 2.5-8 MB, many in CMYK
Compress them for the web without changing file names, so store links would not break
File access only through the MODX file connector, without FTP or SSH

What we built

PNG: converted to RGB, resized to 1024 px, processed with pngquant and oxipng, keeping the same name and extension
JPEG recompressed as JPEG, with the internal format matching the extension
Replaced files through the MODX connector using the same names and cleared the cache
Backed up every original, with file sizes verified down to the byte
Checked in production: response, size, and format of every file; alt text and slider on a sample of product pages

Before and after

What	Before	After
Photo size on product page	2.5-8 MB	32-371 KB
Total size of 65 files	164 MB	11 MB

Result

Both compression batches passed independent checks in production
File names, links, and the store database were not changed
Alt text on product pages remained intact, and the slider serves the compressed version

Technology

PythonPillowpngquantoxipngscikit-image (SSIM)MODX RevolutionminiShop2

What matters in a project like this. The script always output PNG, so 27 .jpg files were uploaded with PNG content inside. We caught it by comparing the byte format with the extension. Compression now branches by extension.