ISO 216 · A-series
A6 paper size — 105 × 148 mm
A6 is 105 × 148 millimetres (4.13 × 5.83 in) — the international postcard size, exactly one quarter of A4. It pairs with the C6 envelope and is the standard for greeting cards, promo cards and pocket notebooks.
A6 — instant conversion
| Unit | Width | Height |
|---|---|---|
| Millimetres (mm) | 105 mm | 148 mm |
| Centimetres (cm) | 10.5 cm | 14.8 cm |
| Inches (in) | 4.134 in | 5.827 in |
| Pixels @ 300 DPI | 1240 px | 1748 px |
| PostScript points (pt) | 297.6 pt | 419.5 pt |
| Picas | 24.8 | 34.96 |
Change the DPI selector to see the pixel resolution at 72, 96, 150, 200, 300 or 600 DPI. Physical dimensions (mm, cm, in, pt, picas) do not change with DPI.
A6 print specifications
- Trim size
- 105 × 148 mm
- With 3 mm bleed
- 111 × 154 mm
- Safe area (3 mm inset)
- 99 × 142 mm
- Print-ready pixels @ 300 DPI
- 1240 × 1748 px
- Matching envelope
- C6 (162 × 114 mm)
- Cards per A4 sheet
- 4 (2 × 2, zero waste)
A6 · 105 × 148 mm
Where A6 is used
- Postcards — the international default
- Greeting cards and invitations (folded A5 → A6 face)
- Promotional handout cards and loyalty cards
- Pocket notebooks and memo pads
- Save-the-date and RSVP cards
- Product tags and packaging inserts
Postcard mailing notes
Most European postal services price A6 postcards at the standard letter rate as long as the card is 250 gsm or stiffer. Leave the right half of the back free for the address block and stamp; postal sorting machines read the bottom 15 mm strip, so keep that clear of design elements.
For the front, full-bleed images need the 3 mm bleed (111 × 154 mm export) — a white-bordered design avoids the bleed requirement entirely and prints reliably everywhere.
Frequently asked questions
What size is A6 paper?
A6 is 105 × 148 millimetres — 10.5 × 14.8 cm, approximately 4.13 × 5.83 inches. It is half of A5 and exactly one quarter of A4.
Is A6 the standard postcard size?
Yes, internationally. A6 (105 × 148 mm) is the default postcard format across Europe and most of the world. The traditional US postcard is 4 × 6 inches (101.6 × 152.4 mm) — slightly narrower and taller than A6.
What is A6 in pixels at 300 DPI?
At 300 DPI, A6 is 1240 × 1748 pixels — the print-ready size for postcards, flyers and greeting cards. At 96 DPI it is 397 × 559 px.
What envelope fits an A6 card?
A C6 envelope (162 × 114 mm) holds an A6 card flat with comfortable clearance. This is the standard greeting-card envelope pairing across Europe.
How many A6 cards fit on one A4 sheet?
Four, in a 2 × 2 grid with no waste. This makes A6 the most economical size for postcards and promotional cards — a print run of 1000 A6 cards uses only 250 A4-equivalent sheets.
What paper weight should A6 postcards be?
250–350 gsm for mailed postcards (postal services require stiffness), 300–400 gsm for premium greeting cards, 170–250 gsm for promotional handout cards that don't need to survive the mail.
A6 vs 4 × 6 inch — which for photo prints?
Photo labs print 4 × 6 in (102 × 152 mm), not A6. If you design at A6 and order 4 × 6 prints, expect ~3 mm cropped from the long edge or thin white borders. For photo products, design at the lab's native 4 × 6 dimensions.