Observed arrival · 2026-09-04

UnderKB: compression for the exact limit

underkb.online Observed source

Editorial interest 83/100 Selection signal · not a rating of the site

A browser-based tool for shrinking PDFs and images to specific KB caps, with separate workflows for portal photos and signature PNGs.

Landing page captured for the 2026-09-04 issue.

Field notes

UnderKB organizes separate browser tools around the constraints commonly imposed by application and upload portals. Its presets target exact limits from 10 KB through 300 KB, while the photo workflow combines a 3.5 × 4.5 cm dimension with a white background and file-size cap. The page also describes a signature route that turns ink on paper into a transparent PNG under 20 KB. It states that Canvas and WebAssembly process files in the current tab rather than uploading them.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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