Printable flashcards PDF generator
A flashcards PDF generator turns typed question–answer pairs into cut-ready card sheets. Type one card per line as front | back and this page lays them onto A4 sheets of 8 cards (2 across, 4 down) with dashed cut lines, entirely in your browser. Each fronts sheet is immediately followed by its backs sheet with the columns mirrored, so printing double-sided with "flip on long edge" puts every answer exactly behind its question.
How it works
The input is parsed line by line: everything before the first vertical bar (|) is the card's front, everything after it the back. Cards are taken eight at a time, and each batch produces two consecutive PDF pages — fronts, then backs — in a 2 × 4 grid on A4, giving cards of roughly 99 × 66 mm after the margins. Cut boundaries are drawn as dashed vector lines, thin enough to disappear into the cut but visible enough to follow with scissors or a guillotine.
The detail everyone gets wrong is the back-page layout. When a duplex printer flips a sheet on its long edge (the normal setting for portrait pages), the paper is mirrored left-to-right relative to what was printed on the front: the card printed in the front's left column physically ends up behind the back page's right column. If you naively lay out the backs in the same order as the fronts, every answer prints behind its horizontal neighbor instead of behind its own question. This generator therefore mirrors the columns on every backs page: for the front grid positions 1–2 / 3–4 / 5–6 / 7–8, the backs page is laid out 2–1 / 4–3 / 6–5 / 8–7. Rows are not reversed, because a long-edge flip on a portrait sheet mirrors horizontally only. The two transformations cancel, and each back lands precisely behind its front.
Interleaving fronts and backs page by page — rather than putting all fronts first — means the PDF works with any duplex pipeline: an automatic duplex printer handles it with the standard "two-sided, flip on long edge" setting, and a single-sided printer can do the same job by printing odd pages, reloading the stack, and printing even pages. Text is centered in each cell with an embedded standard font and automatically stepped down in size for long entries. Print at 100% scale, never "fit to page": duplex alignment depends on the front and back passes using identical geometry, and any rescaling shifts the cut lines relative to the card content.
Illustrative example: 30 Spanish vocabulary cards
Illustrative scenario, not a recorded benchmark. File sizes, timings and results depend on the input and device. Try the reproducible samples.
A learner pastes 30 lines such as la mesa | the table. Thirty cards fill three full batches of 8 plus a partial batch of 6, so the PDF comes out as 8 pages: fronts 1–8, backs 1–8, fronts 9–16, backs 9–16, fronts 17–24, backs 17–24, fronts 25–30, backs 25–30. Card 1 ("la mesa") sits in the top-left cell of page 1; its translation sits in the top-right cell of page 2, which is exactly the position that ends up behind top-left after the long-edge flip. The whole file is about 12 KB. Printed duplex at 100% and cut along the dashed lines, the result is 30 double-sided cards of 99 × 66 mm — front-to-back registration is limited only by the printer's own duplex accuracy, typically within 1 mm.
Frequently asked questions
How do I type my flashcards into the tool?
One card per line, with the front and back separated by a vertical bar, for example: photosynthesis | conversion of light energy into chemical energy. Each group of 8 lines becomes one fronts sheet plus its matching backs sheet.
Why are the backs printed in mirrored columns?
When a duplex printer flips a sheet on its long edge, the left column of the front lands behind the right column of the back. Mirroring the columns on the backs page cancels that flip, so every answer prints directly behind its question.
Which duplex setting should I choose when printing?
Choose two-sided printing with flip on long edge, the default for portrait pages, and print at 100% scale. Flip on short edge would put the backs upside down relative to the layout this tool generates.
How many flashcards fit on one sheet?
Eight cards per A4 sheet, arranged 2 across and 4 down, each card about 99 by 66 mm. Dashed cut lines between cards show exactly where to cut with scissors or a guillotine.
Can I make double-sided flashcards without a duplex printer?
Yes. Print odd pages first, put the printed stack back into the tray, then print even pages on the reverse. Because fronts and backs alternate page by page in the PDF, this manual method gives the same alignment.