Stamp Ninja FAQs

A self-inking stamp contains its ink pad inside the mechanism. Each press makes the impression and then returns the rubber die to the pad, so there is no separate ink pad to carry for normal use.

Choose by the stated impression size, not the outside size of the stamp body. Short names and simple loyalty marks suit compact stamps; addresses, several lines of text and detailed logos normally need more room. If the design looks cramped at its real printed size, move up a size.

A 37 × 12mm stamp takes up to 3 lines of text and a 45 × 18mm stamp takes up to 5 lines. Larger stamps take more, and the personaliser shows the limit for each stamp.

Use the shape that best matches the design. Addresses and multi-line wording usually fit a rectangle; compact logos often suit a square; badges, seals and circular branding usually look best on a round stamp.

Choose a text stamp when you only need typed wording such as an address, name or status. Choose a logo stamp when the impression must reproduce your own logo, signature, symbol or supplied artwork. Use the product description and personaliser to confirm what that item accepts.

Yes. Tell us what you want to stamp, the surface you will use and the approximate space available. For logo orders, send the artwork too. The team can then point you towards a suitable shape and impression size.

Open the relevant personalised product and use its customisation button or fields. Enter the wording exactly as it should appear, upload artwork where offered and check the on-screen layout before adding the product to your basket.

The on-screen preview is your proof. We make your stamp from the design you see when you add it to your basket, so check the spelling, line breaks and layout carefully before you order. We don't email separate proofs.

Yes. Upload the clearest PNG, JPEG or WebP version you have, up to 5MB. A rubber stamp prints solid ink or no ink, so colours, gradients, shadows and transparency may need to be simplified.

Upload a PNG, JPEG or WebP file up to 5MB. Use the largest, sharpest version you have, ideally black artwork on a white or transparent background, and avoid screenshots or images saved from social media.

If needed, you can email vector files (PDF, SVG, EPS or AI) to hello@stampninja.co.uk with your order number.

Yes. Custom designs are reviewed before manufacture. If the artwork, layout or chosen impression size is likely to prevent a reliable result, Stamp Ninja will contact you before production begins.

No. Screens show designs at different sizes, so use the millimetre size on the product page to check your stamp fits the space. The preview is still your proof for wording, layout and position.

Standard self-inking stamps use water-based ink designed for absorbent surfaces such as ordinary office paper, envelopes, cardboard and untreated matt card. The surface needs to absorb the ink for a clean, quick-drying impression.

Our standard ink colours are Black, Red, Blue, Green and Violet. You choose the colour on the product page or in the personaliser.

Standard water-based self-inking ink is not recommended for glossy, laminated, coated or other non-porous surfaces. It can remain wet, smudge or wipe away because the surface does not absorb it. Contact us before ordering if your material is uncertain.

No. Standard office stamp ink is not made for fabric or washing. Choose a product specifically sold as a textile stamp and follow its fabric, drying and wash-care instructions.

A UV security stamp makes an impression intended to be viewed under suitable ultraviolet light rather than normal room light. Use a dedicated UV product and check its product instructions; standard coloured self-inking ink is not the same thing.

For UK delivery, order before 2pm on these dates. We dispatch Monday to Friday.

Standard stamps: order by Friday 18 December, whether you choose Standard or Express delivery.

COLOP EOS stamps: order by Wednesday 16 December. EOS stamps are made to order separately and need two extra working days before dispatch.

Orders for Ireland need to be placed earlier, so please email us first and we will confirm a date. All dates are subject to our delivery carrier's Christmas delivery times, so we recommend ordering as early as you can.

Order before 2pm for same-day dispatch, Monday to Friday. Orders placed after 2pm, at weekends or on bank holidays are dispatched the next working day. If we need to check your artwork with you, it can take a little longer.

Standard UK delivery usually takes 2–4 working days after dispatch. Express aims for the next working day after dispatch.

Free UK delivery over £15. Below £15, Standard tracked UK delivery is £2.

Express UK delivery is £4, or £2 when your order is £15 or more. Delivery to Ireland is £12.99.

You'll see the exact charge at checkout before you pay.

Contact Stamp Ninja immediately with your order number and the change required. Personalised production can begin quickly, so a change or cancellation may not be possible once work has started.

An order confirmation is sent to the email address used at checkout. Dispatch and tracking information depend on the delivery service selected. Check spam or junk folders first, then contact us with your name and order details if an expected message is missing.

Yes. Your VAT invoice is sent automatically in your order confirmation email.

We accept Visa, Mastercard, Maestro, American Express, Discover, Diners Club and UnionPay cards. You can also pay with Shop Pay, Apple Pay or Google Pay; Apple Pay and Google Pay appear at checkout on supported devices and browsers.

Pad life depends on the model, impression coverage, storage and frequency of use. A quality self-inking pad is designed for many impressions. When the print becomes consistently pale or incomplete, it is usually time to fit the correct replacement cartridge rather than replace the whole stamp.

Yes. When the impression starts to look pale, fit a new replacement ink pad rather than buying a new stamp. Each stamp takes the pad that matches its model, which is printed on the stamp body: for example, the 37 × 12mm C20 takes an E/20 pad and the 45 × 18mm C30 takes an E/30 pad.

You'll find them in our COLOP Replacement Ink Pads collection. If you can't find the model number, email a photo of your stamp to hello@stampninja.co.uk and we'll tell you which pad fits.

Look for the model reference on the front or side of the stamp body, such as COLOP C30 or Printer 40, and match it to the compatibility list on the cartridge product page. Contact us with a clear photo of the stamp if the reference is hard to find.

Store it closed in a cool, dry place away from direct heat and sunlight. Remove loose paper fibres gently and avoid solvents or harsh cleaners, which may damage the rubber die or mechanism. Follow the model instructions before taking the stamp apart.

Contact Stamp Ninja promptly with your order number, a description of the problem and clear photographs where relevant. Keep the product and packaging until the team has reviewed the issue and advised the next step.

Personalised items are made to your specification, so the position can differ from a standard unused product. Check the current Refund Policy and contact Stamp Ninja before sending anything back. Faulty, damaged or incorrectly supplied items should always be reported promptly.

Yes. Stamp Ninja supplies businesses, schools, libraries, solicitors, charities and public-sector organisations. Contact the team with the quantities, designs, models and deadline so the most suitable approach can be discussed.

For an existing order, include the order number and the email address used at checkout. For product advice, explain what you need to stamp, the surface, the available space and how often it will be used. Attach artwork or a photo of an existing stamp when that helps identify the right solution.