DOCXNow
Flow
Lossless round-trip plus the line-breaking and pagination pipeline — what the private preview runs on.
● Private preview — one core · two targets
A document in, the same document out — every line proven.
Three planes, one file: the bytes you trust, the layout we prove, the page you get. Scroll to collapse the stack — losslessness is the distance between them being zero.
三層紙、一個檔案：你信任的位元組、我們證明的版面、你看到的頁面。 向下捲動把紙堆壓平——無損，就是三者之間的距離為零。
bytes · untouched ZIP entries
model · KP break points
quire / specimen
無損不是承諾，而是結構：引擎未觸碰的每一個位元組，都會在寫回時原樣出現。
The browser tab and the desktop share one layout core — same advances, same breaks, same display list.
¶ every break proven, never guessed
Everything you see is a rendering target: display lists out, pixels in.
scroll to press the sheet
The pipeline.
Three stages, one Rust core, compiled twice. Nothing is approximated twice — so browser and desktop cannot disagree.
The container opens, nothing is thrown away
OPC is unzipped entry by entry. Every part — even ones Quire has never seen — is claimed, content-addressed, held for write-back. Unknown is not the same as absent.
Real metrics, Knuth–Plass optimum
Shaped advances against real fonts; breaks chosen jointly per paragraph to minimise total badness. UAX#14 decides legality — KP decides what is right.
One keystroke ≠ re-paginate the chapter
Paragraph caches reflow only the dirty interval; breaks settle in background passes. p95 incremental reflow under 8 ms. Output: a display list both renderers draw from.
The line-break theatre — scroll to set the type
One paragraph, proven optimal.
Evidence, not promises
399/399 real-world corpus files round-trip byte-identical in CI — ZIP64 and unknown extensions included
2 × 2 CI matrix: ubuntu / Windows × native + wasm32-unknown-unknown
< 54 KB gzipped first wasm payload — CRDT collaboration code lives in a deferred chunk
Reflow lab — drag it.
The same justification model the engine uses, live in your browser. 拉動滑桿，版面即時重排。
無損不是承諾，而是結構：一個 Office 檔案是數千個宣告的容器，引擎未觸碰的每一個宣告、每一條 ZIP entry、每一個位元組，都會在寫回時原樣出現。瀏覽器分頁與桌面共用同一個排版核心：相同的整形 advance、相同的最佳化斷點、相同的 display list。沒有任何計算被近似兩次，因此也不可能出現分歧——你現在看到的這一行，與原生端渲染的是同一個答案。
One lossless core, three document formats
XLSXNext
Grid
Sibling format crate on the same OPC/lossless core: workbook model, formula engine, sheet render list.
PPTXThen
Canvas
Slide and shape model reusing the layout and shaping crates; its own presentation render list.
Shared: OPC container, OOXML part machinery, lossless discipline. Not shared: the layout model — each format typesets the way its format says it should.
Principles the build enforces
Lossless by construction
Untouched ZIP entries are copied byte-for-byte on write-back; roundtrip --check plus a 400-file corpus gate it on every commit across two OSes.
One core, two targets
The engine compiles to native and wasm32-unknown-unknown. The browser shell is a thin platform adapter, not a second implementation.
Layering, machine-checked
Format crates never import shells; shells enter through one engine API. A CI script enforces the boundary instead of a code review convention.
Real typesetting
Shaped advances against real font metrics, Knuth-Plass optimal breaks, incremental pagination with p95 reflow under 8 ms.
Opening soon
The engine is in private preview while the foundations — XLSX groundwork and the collaborative layer — hold. When the site opens, this section becomes a one-field waitlist; until then, write to [email protected] if you want early access to the playground build.