Contact
Bug reports, feature requests, "this tool ate my PNG" stories, and "this conversion is 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.
Files attached to email reports are deleted once the bug is fixed (or once I confirm I can't reproduce it). If your file contains anything sensitive, redact it with Pixelate in solid-block mode or synthesise an equivalent first: the privacy policy covers what happens in your browser, and an email you choose to send me is by definition outside it.
Requesting a tool
Before suggesting a new tool, press / anywhere on the site and search — with 165 of them, the thing you want often exists under a name you would not have guessed. The workflows page is the other place to look: a lot of requests turn out to be a sequence of two tools that already exist. The bar for adding a new one is "useful enough that I'd reach for it again next month."
What this site doesn't do
Four deliberate gaps, so you don't waste time looking for them:
- No OCR. Tesseract.js is several megabytes of WebAssembly; loading it would
slow every page on the site for the few people who want it. Use
tesseractorocrmypdflocally. - No real PNG optimiser. The browser's PNG encoder does one deflate pass —
typically 0–10% off.
oxipngandpngquantdo far better because they try many filter and palette strategies, which takes seconds per file, not milliseconds. Compress is honest about this and points you at WebP instead, which is where the real saving is. - No AI upscaling or background removal. Upscale is repeated 2× canvas resampling with an optional sharpening pass, and Pixel-art upscale is nearest-neighbour; Background keys out one flat colour you pick. Both say so on their own pages. A model that invents plausible detail is a different product, and it would need a server — which would end the "nothing is uploaded" promise this whole site rests on.
- No 16-bit or ICC-managed pipeline. Canvas is 8-bit sRGB, so that is what every tool here is. For colour-managed print work, use something that isn't a browser.
Other sites
Sister tools for adjacent file formats: csvkit.org (CSV), jsonlkit.com (JSONL / JSON Lines), tomlkit.org (TOML), geojsonkit.org (GeoJSON). Same browser-only philosophy.