Web app

How bg0.parastus.me works, what it accepts, and what to expect on first load.

The web app at bg0.parastus.me is the whole product in one page. Drop an image, compare, download. There is no account, no upload, and no limit on how many images you process.

Input

Drag a file anywhere on the page, paste an image from the clipboard, or choose one with the file picker. On a phone, the picker opens the camera roll.

First load

BG0 selects the model automatically: full BiRefNet is roughly 452 MiB, and the lite fallback is roughly 94 MiB. The selected model downloads on the first removal. It is stored in the browser cache, so later sessions normally read it from local storage instead of downloading it again. Reloading still requires ONNX initialization and copying weights to the GPU, which can take a few seconds. Private browsing, cleared site data, or browser storage eviction can trigger another download.

Compare view

After processing you land on the compare view. The line splits the original on the left from the result on the right. Drag it with the pointer, slide it with the arrow keys, or hold Space to see the whole original. Use the Result and Original tabs to view either image on its own.

Output

Downloads are PNG files with an alpha channel, named after the original with a -bg0 suffix. Copy places the same PNG on the clipboard so you can paste it straight into a design tool or a chat.

Hardware

BG0 uses browser hardware hints to choose whether to try full BiRefNet or the smaller BiRefNet-lite first. Those hints cannot guarantee compatibility. If the selected model cannot load or run, BG0 attempts the lite model and WebAssembly fallbacks automatically. Processing time varies by device. See the browser library’s selection rules and verification scope for the thresholds and environments tested.