Initials, a short code or tiny mark
Best when the content is deliberately brief. Do not force a full address or detailed logo into a very compact area.
Start around 11mm square or 26 × 9mmSee compact personalised stamps →Impression area first · stamp body second
Which stamp size do I need?
Choose the smallest impression area that keeps your longest line, total number of lines and important detail clear. This guide turns millimetres into practical uses.
Choose by the impression area, not the outside dimensions of the stamp body.
More content needs more room
Proportions are illustrative. A screen cannot show guaranteed physical print size.
mm
Impression area first
The listed size is the maximum printable area.
Aa
Clarity beats empty space
Use enough room for the content, not the biggest stamp by default.
▭
Shape matters
Long wording, square logos and signatures need different proportions.
✓
Designs are checked
Custom artwork is reviewed before manufacture.
The important distinction
The measurement is the maximum impression area.
A 48 × 18mm stamp can place a design within an area up to 48mm wide and 18mm high. The plastic casing is larger. Your finished design may also use slightly less than the full area so letters, lines and edges have breathing room.
Measure the mark you want on the page — not another stamp's outer shell.
Larger outer stamp body
PRINTABLE AREAthe quoted width × height
Illustration only — not shown at physical size
Choose by content
What will your stamp need to say?
These are practical starting points from the current Stamp Ninja range. The longest line, number of lines, font and artwork detail can move you up or down a size.
A name, short message or reference
A compact rectangle suits one to three short lines and keeps a small footprint on paperwork.
Start around 37 × 12mmCompare text stamps →Everyday address or business details
A useful middle ground for several readable lines without taking over the document.
Start around 48 × 18mmShop everyday sizes →A fuller address, logo and wording
Extra width and height help when the design has more lines, a logo, longer wording or several contact details.
Start around 58 × 22mmSee logo stamp options →A long line or prominent large mark
A wide, shallow size can suit a long message or signature. Taller large formats suit multiple lines and more visual impact.
75 × 18mm or 70–77mm wideSee signature stamps →A balanced logo, symbol or QR code
Square artwork usually fits a square impression better than a shallow rectangle. Give QR codes generous room and test the finished mark.
20mm, 30mm or selected 40mm squareSee QR code stamps →Current range map
Common impression sizes at a glance
Use this table to narrow the choice, then confirm the live product description and personalisation preview before ordering.
| Size group | Current examples | Good starting point for | Watch for |
|---|---|---|---|
| Very compact | 11mm square · 26 × 9mm | Initials, tiny labels, very short references | Limited line length and detail |
| Compact rectangle | 37 × 12mm | Names and one to three short lines | Long wording can become too small |
| Everyday rectangle | 48 × 18mm | Addresses and routine business details | Complex logos may need more room |
| Roomy rectangle | 58 × 22mm | Fuller addresses, logo plus text, longer lines | Check the space available on the document |
| Wide line | 75 × 18mm | Signatures, long statements and wide layouts | Not ideal for tall or square artwork |
| Large and extra-large | 70 × 30 · 75 × 38 · 77 × 36mm | Multiple details, larger logos and prominent marks | More size does not rescue unsuitable artwork |
| Square | 20 · 30 · selected 40mm | Square logos, symbols, badges and QR layouts | Leave clear space around important detail |
Product ranges and options can change. Treat these as choosing examples, not a guarantee of current availability. The individual product page is the final source for size, line and ink-colour options.
Fit the shape
The same area can behave very differently.
Choose proportions that follow the content. That normally gives larger, clearer lettering than squeezing the same design into the wrong shape.
ADDRESS
DETAILS
DETAILS
Standard rectangle
The natural fit for addresses, business details and several short lines of text.
Signature
Wide and shallow
Useful for signatures, long wording and layouts that need more width than height.
LOGO
OR QR
OR QR
Square
A better use of space for balanced symbols, square logos, badges and QR code artwork.
Detail needs room
Small is only useful when it stays clear.
A bold, simple logo can work at a smaller size than a detailed crest. Fine lines, tiny type, tight gaps and long web addresses all need enough room to reproduce cleanly.
- Keep important text comfortably readable.
- Avoid hairline strokes and crowded detail.
- Use clean, high-contrast artwork where possible.
- Give QR codes clear space and test every finished impression.
NINJA
CO.Simple and openBold lettering and useful gaps
CO.Simple and openBold lettering and useful gaps
STAMP NINJA CUSTOM RUBBER STAMPS
VERY SMALL DETAILS • THIN LINES
LONG-WEBSITE-ADDRESS.CO.UK
BLACKBURN • LANCASHIRECrowded and tinyMove up a size or simplify
VERY SMALL DETAILS • THIN LINES
LONG-WEBSITE-ADDRESS.CO.UK
BLACKBURN • LANCASHIRECrowded and tinyMove up a size or simplify
Before you choose
Measure these three things.
A ruler and a quick paper mock-up can prevent an oversized stamp, undersized lettering or a design that does not fit its intended space.
The available surface
Measure the clear space on the actual envelope, form, card or packaging — including margins and nearby printed content.
Tip: draw the width and height on scrap paper.The longest line
Count the lines and identify the wording that takes the most horizontal space. That line often decides the minimum width.
Tip: shorten optional wording before buying a much larger stamp.The smallest detail
Look at tiny type, fine lines and narrow gaps. Detailed elements often decide the minimum height and overall scale.
Tip: simpler artwork usually produces the strongest mark.Go to the right range
Choose by what you are making.
Each collection is organised around a different design problem, so you can compare relevant sizes without searching the whole shop.
Personalised text stamps
Names, addresses, messages and everyday business wording across compact, standard and large impression areas.
Shop personalised stamps →Logo stamps
Choose the shape and size around the proportions, fine detail and supporting wording in your logo.
Shop logo stamps →Signature stamps
Made for handwritten signatures and other long, shallow designs that need width without unnecessary height.
Shop signature stamps →QR code stamps
Square-format options with guidance for clear space, artwork quality, ink coverage and testing.
Shop QR code stamps →A useful safety net
Your custom design is checked before manufacture.
Choose the closest impression area and submit the personalisation or artwork. If the selected size or design is likely to affect the result, Stamp Ninja can contact you before production.
1
Choose the impression areaUse this guide, the Stamp Finder and the live product description.
2
Personalise and reviewCheck spelling, line breaks and the on-screen design before ordering.
3
Artwork checkYour custom design is reviewed before it is made in Blackburn.
Size is only half the choice — check the surface too.
Standard self-inking stamp ink is intended for absorbent paper and untreated matt card. Glossy, coated, non-porous and washable surfaces can need a different product or ink.
Made with experience
A sizing guide backed by real production.
100,000+stamps produced
Since 2017making custom stamps
BlackburnUK production and support
COLOPauthorised products and expertise
Stamp size FAQs
Before you order.
Clear answers to the questions that most often affect the final size.
How do I measure the stamp size I need?
Measure the mark you want on the page, not the outside of another stamp. Check the clear width and height available on the actual document, envelope, card or packaging, then choose an impression area that fits comfortably.
Is the listed size the stamp body or the printed impression?
It is the maximum impression area: the space available for the printed design. The plastic stamp body is larger. The finished artwork may use slightly less than the full area to allow breathing room around letters and edges.
Should I always choose the smallest stamp that fits?
No. Choose the smallest size that keeps every important line and detail comfortably clear. Forcing long wording, tiny type or a detailed logo into a very compact area can reduce legibility and print quality.
What is a good size for an address stamp?
A 48 × 18mm impression is a useful everyday starting point for several short address lines. Shorter addresses may suit a compact size, while longer business details or a logo may benefit from 58 × 22mm or a larger format. Check the live product line allowance and preview.
Does a detailed logo need a larger stamp?
Usually. A simple, bold logo can reproduce at a smaller size than artwork with fine lines, tiny lettering or tight gaps. Moving up a size or simplifying the artwork can give important detail more room.
Which shape is best for a signature stamp?
A wide, shallow rectangle normally follows a signature more efficiently than a tall format. Measure the signature itself and leave a little space around its highest, lowest and longest strokes.
How large should a QR code stamp be?
QR codes need clear artwork, enough size for the code complexity, a clean quiet area around the code and an even impression. A short destination URL can produce a less complex code. Test the final physical impression on the intended material and do not rely on size alone.
What happens if I choose a size that is too small?
Stamp Ninja checks custom designs before manufacture. If the selected size or artwork is likely to affect the result, the team can contact you before production. This check does not replace reviewing your spelling, line breaks, measurements and on-screen personalisation before ordering.
What should I send if I am unsure about the size?
Send the exact wording or artwork, the maximum space available and what you will stamp. A photo or measurement of the document, label or packaging area can also help the team recommend an appropriate format.
Still deciding between two sizes?
Use the Stamp Finder for a quick recommendation, or send the wording, artwork and available space to Stamp Ninja for help.