What this product is
Crush is a free web page that re-encodes still images in your browser. You choose JPEG, PNG, or WebP, set a quality for the lossy formats, optionally cap width or height, and download the result or a ZIP. The pipeline is createImageBitmap plus Canvas plus toBlob. That is the whole machine. There is no queue on a GPU box, no “processing…” spinner that means someone else’s disk, and no watermark.
The design problem we actually care about is JPEG math vs WebP vs PNG — when 8×8 blocks appear, when a CMS still rejects .webp, when a screenshot must not become a JPEG. That is documented on JPG vs WebP rather than hidden in a tooltip.
What we deliberately do not do
We do not convert HEIC (wrong codec). We do not transcode video. We do not keep animation. We do not store jobs. We do not train models on your pixels. We do not require an email to download. Ads, when the site is approved, are Google AdSense placeholders until then — they are not mixed into the download button.
Who makes it
Ultimatum is a brand-marketing studio. Crush is one local-first utility in a family of tools that keep files on the device (invoice PDFs, HEIC conversion, PDF toolkit). Other tools are mentioned once so you can find them; this site is only the compressor. Studio work — identity, sites — is separate from this free page.
Questions: contact. How the slider works: how to. Legal: privacy and terms.