Taiwan’s 3×5 photo size: 3.5×5 inches, 3R and the close Japanese L format

Exact inch sizes and commercial labels

4×6 inches is exactly 10.16 × 15.24 cm, not exactly 10×15 cm. Japanese L is 89 × 127 mm (3.5×5 inches is 88.9 × 127 mm); KG is 102 × 152 mm (4×6 inches is 101.6 × 152.4 mm); 2L is 127 × 178 mm (5×7 inches is 127 × 177.8 mm). These are close commercial formats, not exact equivalents or a guarantee of frame compatibility. Check the supported picture size, the visible opening, and the outside dimensions separately. A smaller L print can usually enter a 4×6 album pocket but may sit loosely; the reverse may not fit. 300 PPI is a common close-viewing target, not a guarantee of sharpness.

flowchart TD
 A["Inches: 3.5 × 5"] --> B["Exact conversion: 88.9 × 127 mm"]
 B --> C["Check product size"]

The photo size called “3 × 5” in Taiwan is 8.9 × 12.7 cm.

That answer needs a qualification: Taiwan’s photo-printing shorthand “3 × 5” actually refers to 3.5 × 5 inches. The short edge is 3.5 inches, not 3. The original article identifies this as the exception in the common photo-size names it compares, which is why people so often calculate it incorrectly.

The close Japanese format is L判, or L size, at 89 × 127 mm, where it remains a basic photo-printing format for albums, frames and convenience-store machines. A size that may feel obsolete to a Taiwan customer can still be the expected standard sheet in Japan.

Quick size reference

Remember the first row and the last two: the specification is 3.5 × 5, not 3 × 5; menus may say 3R, and Japanese menus say L判. The inch format and Japanese metric product are close, with a 0.1 mm short-edge difference. Hong Kong also commonly uses 3R for the size Taiwan calls “3 × 5.”

Why say “3 × 5” when the short edge is 3.5 inches?

Taiwan’s everyday names and international photo-size names follow different conventions. In the original article’s explanation, this size is the one at which both conventions drop the fraction.

In the common R sizes, the number before R matches the short edge in inches: 4R is 4 × 6, 5R is 5 × 7 and 6R is 6 × 8. With a 3.5-inch short edge, this format is instead named 3R. Everyday photo-shop speech then calls that “3 × 5,” losing the decimal.

Taiwan’s other colloquial “inch” naming uses the long edge: a six-inch photo is 4 × 6, seven-inch is 5 × 7, and eight-inch is 6 × 8. By that logic, 3.5 × 5 would be a five-inch photo. You rarely hear that name in Taiwan shops because the size itself is uncommon; the name may not communicate what you want. Joe compares the systems in the complete size-system table.

The safest way to order is therefore to give dimensions rather than a nickname: say 8.9 × 12.7 cm or write 3.5 × 5.

3.5 × 5 is not half of 4 × 6

A common misconception is that the next smaller format must be cut from half a 4 × 6 sheet. It is not part of that subdivision sequence.

The first three rows follow one subdivision sequence. Halving the longer side leaves dimensions starting with 4 or 2; neither edge matches 3.5 × 5. It is a separate format inherited from the film era, not a cut-down 4 × 6. The areas are 17.5 and 24 square inches: 3.5 × 5 is about 73% of 4 × 6, while 4 × 6 is about 37% larger than 3.5 × 5. This is one size smaller, not half as large. To print a 3.5 × 5 composition at 4 × 6, adjust the composition rather than simply enlarging it.

For full 4 × 6 specifications and how phone photos are cropped, see the complete 4 × 6 photo guide.

Japan’s basic format: L size

Taiwan customers may associate 3.5 × 5 with older photographs, but L size remains a current basic format in Japan. The same 8.9 × 12.7 cm sheet has a different market position.

In Japanese convenience-store multifunction printers, L size, 89 × 127 mm, is the smallest basic photo-paper option in the original article’s comparison. Lawson’s published prices cited there are ¥30 for a color L print, ¥80 for 2L and ¥50 for a 127 × 127 mm square. The 7-ELEVEN, FamilyMart and Ministop machines discussed likewise use L as a basic photographic-paper format. Japanese album pages, desktop frames and standard photo printing are also built around it.

This causes a practical mismatch in both directions. Photos printed in Japan do not properly match Taiwan albums designed for 4 × 6: L size is about 2.5 cm shorter on the long edge. Conversely, a Taiwan 4 × 6 print will not fit an L-size frame or album bought in Japan. To obtain Taiwan’s familiar 4 × 6 size at a Japanese machine, look for KG判. See the section on Japan’s default size in the 4 × 6 guide for the complete naming comparison.

Why has Japan kept L instead of switching to 4 × 6?

The original article explains that a format retained as a default for sixty years is usually supported by more than habit. L size fits Japan’s paper-size system more closely than 4 × 6 does.

L and 2L both fall between 1.40 and 1.43, less than 1% from the A4/B5 system’s 1:√2 ratio. Put two L prints side by side along their long edges and they form a 2L sheet. Joining two sheets and enlarging one image are different questions, however. L and 2L do not have exactly the same aspect ratio, so enlarging an image may still need a small crop or white margins; this is not the A series’ exact preservation of shape. The inch-based sequence here changes from 1:1.5 at 4 × 6 to 1:1.333 at 6 × 8, so changing size requires a fresh crop of the same composition.

In a market where albums, frames and printers must match, this is an inventory issue as well as an aesthetic one. L photos sit neatly within B6 layouts and A5 notebooks; 4 × 6 introduces a different strip of margin to handle. The article’s explanation is that the cost of replacing L as Japan’s basic format is greater than the benefit.

Why Taiwan moved the other way, replacing 3.5 × 5 with 4 × 6 and then rarely printing it, is a separate industry-history topic involving generations of printing equipment and convenience-store format concentration. Joe covers it in Taiwan’s changing photo sizes (Chinese original). For immediate cross-system comparisons, use the size-system table.

Where Taiwan customers could still order 3.5 × 5

It was still available, but through a narrow set of channels. In the September 15, 2026 public-price check for the original article, only the Japan-based cross-border service among the main channels examined offered it to Taiwan customers.

The notable name is 日式（3.5×5）, “Japanese-style (3.5 × 5),” rather than 3R or L. The factory in Japan takes Taiwan orders, so its product naming follows the Japanese default, making it an accessible route for this size from Taiwan in the original comparison. The trade-off is cross-border delivery: international mail was about 14–21 days. nuPhoto’s 幸福小卡 can be mistaken for this format, but it is 3 × 4 inches, 7.6 × 10.1 cm; neither edge matches. Minimum quantities, shipping and delivered-cost examples are in the Taiwan photo-printing channel guide, the page maintained for price changes.

How many pixels do you need?

As with other sizes, multiply inches by PPI.

3.5 × 5 is the smallest of the common photo-print sizes compared here. At 1,050 × 1,500 px, it needs only about 1.58 megapixels; phones from the ten years preceding the original article generally exceed this by a wide margin. Pixel count is therefore rarely the problem at this size. A poor source—such as a messaging-app-compressed image or screenshot—is more likely to cause trouble, and making the print small does not restore missing quality. See the photo-size and pixel-conversion guide.

Related photo-size reading

• The industry history behind the change: why Taiwan replaced 3 × 5 with 4 × 6 while Japan did not (Chinese original).
• Full 4 × 6 specifications and Japanese names: the 4 × 6 guide.
• Full 5 × 7 / 2L specifications: 12.7 × 17.8 cm.
• Full 6 × 8 specifications: 15.2 × 20.3 cm.
• Full 8 × 10 specifications and certificate frames: 20.32 × 25.4 cm.
• Comparisons across eight naming systems: complete size-system table.
• Prices, minimum quantities and shipping: Taiwan photo-printing channels.

Make your own image at the right size

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Sources for the specification checks

Dimensions and formulas checked on 30 October 2026. Prices and service examples retain the observation dates stated in the article.

• FUJIFILM: Japanese photo print dimensions
• IKEA: supported picture size, mount opening and outside measurements
• Adobe: image resolution for printing

Keywords: 3 × 5 photo size, 3.5 × 5, 3R size, L判 dimensions, KG判, printing photos in Japan, Taiwan five-inch photos.