The conversions you need, all in your browser.
A fast, browser-side toolkit for the file and format conversions you reach for every week. Images, CSV / JSON / YAML, Base64, color spaces and more. Files are processed locally in your browser, never uploaded to a server.
Why we built it, and the bet that conversions belong on your machine, not on someone else's server.
Most online converters are ad-stuffed, slow, and quietly upload your files to someone else's server. For sensitive data or large batches, that's a non-starter.
One clean app for the conversions you actually need, all running in the browser. Drop a file or paste data, pick the target format, get the result. No signup, no upload, no waiting in a queue.
Four design choices that keep Konvertr fast and out of your way.
Conversions run entirely in the browser via WebAssembly. Your files never leave the device.
Image formats, structured data (CSV/JSON/YAML), Base64 and color spaces, under a consistent UI with the same keyboard-friendly flow.
Drop dozens of files at once, convert them in parallel, and download the whole batch as a single ZIP.
TanStack Start + React + Tailwind on the front, with type-safe routes and SSR where it helps SEO. No bloated SaaS dashboard.
No bloated framework, no server-side processing. Just modern web primitives doing the work.
Free to use, no account required. Drop a file and try it now.
Try Konvertr