About Decky.onlinePrintable flashcards for teachers, made in your browser.

Decky.online is a free, browser-only tool for building printable flashcards. You paste or type card content, pick a template, choose colours, and download a print-ready PDF. Every card you make stays inside your browser — nothing is uploaded to a server.

What it does

• Four card templates: Quote, Vocabulary, Q&A, and Concept.
• Multi-script: Latin, Cyrillic, Greek, Hebrew, Arabic (and Persian / Urdu / Pashto), Devanagari (Hindi / Marathi / Nepali / Sanskrit), Bengali, Gurmukhi, Gujarati, Tamil, Telugu, Kannada, Malayalam, Sinhala, Thai, Myanmar, Ethiopic, Japanese, Chinese (simplified and traditional) and Korean. Bidi-aware layout — a Hebrew quote with Latin numerals like 1967 renders correctly.
• Print-ready PDF export, in single, fold, or double-sided modes. 1, 2, or 4 cards per A4, B4, or US Letter sheet, portrait or landscape.
• Long-edge or short-edge duplex flip with auto-mirrored backs, so two-sided prints line up after you flip the page.
• Crop marks at every card corner so you can cut accurately with scissors or a guillotine.
• Per-card image upload with size + position controls.
• Per-card colour themes; pick from 16 named presets or create your own.
• Compressed .deck export / import so you can save your work or share it with a colleague — the file format the samples ship in is the same one your exports produce.

Why browser-only

We don't ask you to sign in. We don't store your cards on a server. We don't have a backend. Everything happens in the browser tab you have open right now: PDF generation, font rendering, image processing, deck storage. Your active deck autosaves to your browser's IndexedDB so a reload doesn't lose your work.

For privacy specifics — what we do collect (small aggregate analytics) and how to opt out — see the Privacy policy.

Who it's for

Teachers preparing classroom materials. Language tutors making vocabulary decks. Trainers who want to print their content instead of putting it behind a login. Anyone who wants a flashcard quickly without an account, a subscription, or a sync server.

Design choices

Print-first, screen-second

Most flashcard apps optimise for a quiz interaction on screen. Decky optimises for the printed page: rectangular cards in a regular grid, dashed cut lines, mirrored duplex backs, adjustable density. The on-screen preview shows exactly what the PDF will be.

Fonts that work

Multi-script support is the reason the bundle is large (~32 MB of Noto fonts), but each family is lazy-loaded only when a card actually contains glyphs in that script — so a deck of English quotes never downloads the Hebrew or Arabic font, and only pays for the 825 KB Latin one.

No accounts, no sync

IndexedDB persistence is enough for one device. To move a deck across devices or share it with a colleague, export it as a .deck file and import on the other side. The file is gzip-compressed JSON; you can also read or edit it externally if you ungzip it.

Source & contact

Questions, feedback, bug reports: info@decky.online. Bundled fonts are released under the SIL Open Font License (Noto Sans family). Sample deck images come from Wikimedia Commons / NASA — see the credits file shipped in the source repo for full attribution.