Work05Browser application
Transmute
Files in. Other files out. A local-first file converter. Images to PNG, JPG, WebP, GIF or PDF; DOCX to HTML, Markdown or text; CSV, TSV and JSON between each other. Every conversion runs in the tab, and the app works offline after first load.
01 /
Why
Online converters ask you to upload the file to find out what you will get back. Transmute does the work with the Canvas API and a few well-chosen libraries in the browser, then explains exactly what it did with GIF palettes, JPG transparency and PDF page sizes instead of guessing on your behalf.
02 / Details
What it actually does.
- 01
Three families
Images (PNG, JPG, WebP, GIF, BMP, AVIF, SVG), Word documents (DOCX) and tabular data (CSV, TSV, JSON).
- 02
Honest edge cases
JPG has no alpha, so transparency is painted onto a colour you pick. PDF embeds opaque images as JPEG and transparent ones as PNG. Unsupported or broken files are reported per file, with the reason.
- 03
Loads only what it needs
The PDF, DOCX and CSV libraries are dynamic imports, so the first paint carries only the image path.
- 04
No network after load
No analytics, no telemetry, no upload endpoint. Disconnect and convert anyway.
03 / Stack
Built with.
A React 19 application built with Vite and Tailwind CSS. Everything runs in the browser; the build is a static folder deployed to Vercel on its own subdomain.
- 01React 19
- 02Vite
- 03Tailwind CSS
- 04Canvas API
- 05pdf-lib