Launching today

Imposia

Launching today

HTML pagination where preview and print stay in sync

2 followers

HTML pagination where preview and print stay in sync

2 followers

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Documents can look right in the browser, then shift when printed or saved as a PDF. Imposia is an open-source, browser-native publishing toolkit built to reduce that drift. It keeps one canonical page document across HTML/CSS pagination, preview, and native print instead of rebuilding the layout for each surface. Use it with React or its framework-neutral Core, inspect typed layout warnings, control asset loading, and export reflowable EPUB 3.3—without a server renderer.

Free

Launch tags:Open Source•Developer Tools•GitHub

Launch Team / Built With

Customer.ioAutomate Messaging Everywhere — Startups Get 12 Months Free

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OpenAI

OpenAI Day

What did GPT-5.6 Sol, Terra and Luna unlock that made your launch possible?

Maker

GPT-5.6 Sol, Terra, and Luna helped turn a difficult browser-specific problem into a shippable open-source toolkit. I used them to reason through pagination edge cases, review the React and TypeScript architecture, build cross-browser tests, and audit the repository before making it public. They also accelerated documentation, localization, and launch preparation. The biggest unlock was being able to iterate across implementation, debugging, testing, and release work as a solo developer without lowering the bar for correctness.

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14h ago

Maker

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Hi Product Hunt, I started building Imposia after repeatedly running into the same frustrating problem: a document looked right in the browser, but the printed or Save as PDF result did not. Page breaks moved, page counts changed, and small differences became long debugging sessions. The underlying issue was that pagination, preview, and print were often handled by different DOM trees or rendering paths. I wanted one document to remain the source of truth throughout the entire process. That became Imposia, an open-source, browser-native HTML/CSS publishing toolkit. It keeps one canonical page document across pagination, preview, and native print. Today it includes: • React-first and framework-neutral Core APIs • Paginated HTML/CSS with page geometry and typed layout warnings • Continuous, single-page, and spread viewing modes • Publication outlines, search, thumbnails, and diagnostics • Controlled asset loading and sanitization • Reflowable EPUB 3.3 export Imposia does not replace the browser with a server-side PDF renderer, and it does not promise perfect support for every CSS fragmentation case. The goal is an inspectable and explicit workflow that is less likely to drift between preview and print. I would love feedback from anyone building editors, reports, books, invoices, or other document workflows. Where has browser printing caused the most trouble for you?

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4d ago

Customer.ioAutomate Messaging Everywhere — Startups Get 12 Months Free

Promoted

OpenAI

OpenAI Day

What did GPT-5.6 Sol, Terra and Luna unlock that made your launch possible?

Maker

Report

14h ago

Maker

📌

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4d ago