parallax

parallax shows a web page and its translation side by side in the same tab, and keeps them on the same sentence as you scroll. Translation runs on your own machine, using Chrome's built-in Translator API. There is no API key to get, no account to make, and no service to trust: the text of what you read never leaves your computer. Once Chrome has downloaded a language pack, it works with no network at all. WHAT IT DOES • Splits left/right or top/bottom, at whatever ratio you drag the divider to. • Drag a pane small enough and it goes away. Dragging away the translation puts you back on the original page, exactly where you left it. Dragging away the original leaves the translation full width to read. • Keeps the panes aligned by content, not by percentage. A translated paragraph rarely takes up its original height, so scrolling two columns in proportion drifts further apart with every screen. parallax matches the panes block by block and scrolls the other one so the matching block lands in the same place. • Translates what is on screen first, so a long article is readable in about the time it takes to translate one screen rather than all of it. • Can read sites that normally refuse to be shown in a frame — GitHub, MDN, arXiv and others — if you allow it, one site at a time, for one tab, until the split closes. REQUIREMENTS Chrome 138 or later on desktop, where the built-in Translator API is available. It does not exist on Android or iOS. The first use of a language pair downloads a language pack. PRIVACY No analytics, no telemetry, no accounts, no data collection of any kind. The only things stored are your chosen languages and split layout, kept on your machine. Full policy: https://github.com/mei28/parallax/blob/main/PRIVACY.md KNOWN LIMITATIONS • Each pane is another load of the page, so in-page state — form input, an SPA's route, media playback — starts fresh inside them. The original page underneath is untouched and gets it all back when the split closes. • Following a link moves both panes but does not yet re-translate automatically; use "Translate this page again" in the popup. • A link to another site ends the split and returns you to where you started. • Some sites will not run inside a frame for reasons no permission can change. Source code: https://github.com/mei28/parallax