Problem

I download a lot. Invoices, research PDFs, screenshots. The default filenames are garbage — download (47).pdf, IMG_2241.png. A folder of those is a hostile place to search through three weeks later.

Approach

A Chrome extension that catches the download intent, reads the page context (title, headings, the visible URL slug), and renames via a small ruleset. Smart placeholders like {domain}, {date}, {originalFilename}, {category}, plus a custom-placeholder editor with regex-backed text and counter types. A floating preview panel shows the resolved name in real time before the file is saved.

Stack

Plain Manifest V3 — vanilla JavaScript, no framework, no build step. HTML + CSS for the options UI. The whole thing is a few hundred lines plus a small placeholder DSL. Easier to audit than to bundle.

What shipped

Live on the Chrome Web Store. Five-star reviews from a small number of people who really, really cared about filenames — which turns out to be exactly the audience.

What’s next

Firefox build (Manifest V3 has finally stabilized over there) and an exportable rule pack so teams can share conventions.