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 half of A5, nominally a quarter of A4. It pairs with the C6 envelope and is the standard for greeting cards, promo cards and pocket notebooks.
Next: Check a photo is sharp enough for A6·Print it at exactly A6·Convert to pixels, points or inches
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, 1 mm trim strip)
A6 · 105 × 148 mm
Dashed outline: a standard credit card (ISO/IEC 7810, 85.6 × 54 mm) at the same scale.
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.
What are you trying to do?
Most people looking up A6 are partway through something else. These open with the size already set.
- Check a photo is sharp enough for A6Drop in the image and see its effective resolution at this size.
- Print it at exactly A6Where the 100% setting hides, and why Fit to page shrinks it 3–6%.
- Convert to pixels, points or inchesEvery unit at any DPI, plus photocopier scaling percentages.
- Find an envelope for A6Pick a fold and see which standard envelopes take it.
Frequently asked questions
How big is A6 paper?
A6 is 105 × 148 mm — 10.5 × 14.8 cm, 4.13 × 5.83 in. To picture it: the international postcard size, about the size of a paperback page. If you need it in pixels the answer depends on resolution — the table above gives every common DPI.
What size is A6 paper?
A6 is 105 × 148 millimetres — 10.5 × 14.8 cm, approximately 4.13 × 5.83 inches. It is exactly half of A5 (210 ÷ 2 = 105 — no rounding at that step) and nominally a 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 a 1 mm trim strip left over (2 × 148 = 296 of A4's 297 mm). It is still the most economical card size: a run of 1000 A6 cards uses about 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.