Contact
Bug reports, feature requests, "the compressor missed my target size" stories, and "this conversion looks wrong" reports are all welcome. The fastest way to get my attention is email with a small sample file attached (one I can use to reproduce — preferably one I can keep, but not required).
Reporting a bug
A useful bug report has three things: (1) the URL of the tool you used, (2) what you expected vs. what happened, and ideally (3) a sample file that triggers it. The third one is the most valuable — without a reproducer, I'm guessing. The sample JPGs are a good starting point if your own photo is private.
Files attached to email reports are deleted once the bug is fixed (or once I confirm I can't reproduce it). If your photo contains anything sensitive, please synthesise an equivalent — the privacy policy on the site only covers what happens in the browser, not what you choose to send me. Tip: strip the EXIF before attaching, at minimum.
Requesting a tool
Before suggesting a new JPG tool, check the homepage and the footer to make sure it's not already there in slightly different form. The tools that currently exist solve problems I've personally hit; the bar for adding more is "useful enough that I'd reach for it again next month."
What this site doesn't do
It does not convert HEIC (iPhone) photos — browsers outside Safari can't decode HEIC, and shipping a multi-megabyte decoder would slow every page load. It does not do AI background removal or upscaling. And it does not edit EXIF selectively (keep copyright, drop GPS) — Remove EXIF strips the whole block; per-tag editing is desktop-tool territory. Each of those is a deliberate gap, not an oversight.
Other sites
Sister tools for adjacent file formats: pngtoolskit.org (PNG), pdftoolskit.org (PDF), csvkit.org (CSV), jsonlkit.com (JSONL / JSON Lines). Same browser-only philosophy.