llms.txt
+18 −2
− - [MCP server](https://b59.link/mcp): the same functions as MCP tools− - [Public analytics](https://b59.link/analytics)+ - [Slide QR sizer](https://b59.link/tools/slide-qr): a link, the screen height (or width and aspect) and the back row (row count on 36-inch centres from a front gap, or a distance) -> the share of the slide height the code needs at 3 and 2 camera pixels a square (1,445 px per metre at 1 m for a 1920-pixel phone frame), whether it fits with its margin, a verdict per row, PowerPoint inches and a 1920 x 1080 PNG. Runs in the browser+ - [Badge QR sheet](https://b59.link/tools/badge-qr): an attendee CSV (name, company, optional link; header row or that order), 4 x 3 or 4 x 6 inch badges, one per page or 6/2 per US Letter or A4 sheet (backs mirrored for a long-edge duplex flip) -> a double-sided PDF: names on the front, the event short link code on the back with what it opens and up to 4 lines, each attendee's own link code on the front sized at level M, with how close a phone must come (3 camera pixels a square) and warnings f+ - [Booking page](https://b59.link/tools/booking): a booking page in the owner's look (plans paid once, per session or monthly; times in the visitor's time zone; payment to the owner's own Stripe, Razorpay or Cashfree account; emails and reminders to both sides; customer and admin pages to move or cancel). Free to make at https://b59.link/book/me. REST API and MCP server with email-code sign-in: https://b59.link/book/docs, https://b59.link/book/llms.txt+ - [Printed-link watch](https://b59.link/tools/printed-link-watch): up to 25 printed links (QR codes, short links, any vendor) checked once a day from the server -> dead, lands somewhere new, deactivated/parking page, redirect changed or certificate expiring, a shareable result page at b59.link/w/<slug> and optional email alerts (POST https://b59.link/api/watch {"links": [{"url": ...}]}; MCP watch_printed_links, get_watch_report; docs https://b59.link/docs/printed-link-watch)+ - [MCP server](https://b59.link/mcp): the same functions as MCP tools, 10 requests a second with or without a key+ - [Analytics](https://b59.link/analytics): signed-in view of your own trackers and short links+ - [Links in a PDF price list or trade catalogue: order pages that keep working when the prices change](https://b59.link/articles/pdf-price-list-trade-catalogue-links): Trade customers order from last year's PDF. One distributor's 2026 list shows 31 price increases from 22 manufacturers, one item up almost 30% in a year. One short link per section (24 to 64 links, not 640), what our test found Chrome and Firefox do with addresses that aren't real links, QR sizes for a dense page, a discontinued-i+ - [An insert card in the parcel with a QR code: reviews, reorders and what Amazon, Etsy and eBay allow](https://b59.link/articles/package-insert-card-qr-code-amazon-etsy-ebay-rules): What Amazon's, Etsy's (rewritten 5 October 2026) and eBay's own policies say about review requests, QR codes and links on insert cards, the $4-$6 fee on a repeat order that explains them, what the code should open on each channel, scans per 100 orders and how long to test two card versions, a 20-25 mm code size, and+ - [A QR code on a class timetable at the gym, studio or dance school: booking links that change every term](https://b59.link/articles/class-timetable-qr-code-gym-studio-booking-link): Why the Book link you copied may open one class from last July (we checked five: four did), what each printed place should open, how big the code must be to read from a metre (70 mm for a short link, 85 mm for a booking-system address), one code per class type to see demand, trial-offer links, and keeping last term+ - [Links in a product's instruction leaflet: setup videos, spare parts and warranty registration that outlive the print run](https://b59.link/articles/instruction-leaflet-qr-code-setup-video-warranty-registration): The leaflet is printed in thousands and sealed in boxes, but its link gets scanned for a dozen years. What breaks (YouTube made pre-2017 unlisted videos private in 2021), one link per product and language (12 links for six products, not 288), warranty registration numbers (13% average+ - [We timed 11 link shorteners from 3 cities: the short link cost 34 ms to over a second before the page began](https://b59.link/articles/link-shortener-redirect-speed-11-shorteners-3-cities): Does a short link slow the page down? We clicked test links on 11 shorteners 20 times each from Chennai, eastern France and St. Louis and timed the first hop. Two answered in under 100 ms everywhere; from Chennai, five took over half a second, ours included. The table, the three reasons, and how to time yo+ - [A QR code on a machine or piece of equipment: the manual, the service log and reporting a fault](https://b59.link/articles/equipment-qr-code-label-manual-fault-report): One code per machine opening one page: how-to, manual and a fault form. How far away a phone reads each payload on 19, 25 and 38 mm asset tags (a short link from 36 cm on a 1 × 2 inch tag, a pre-filled form only from 20 cm), our test of scratched, greasy and torn labels at every error correction level, label materials from $0.+ - [A QR code on a wedding invitation or save-the-date: the RSVP form, the gift list and the page after the day](https://b59.link/articles/wedding-invitation-qr-code-rsvp): What a wedding invitation code should open from save-the-date to thank-you, how big it must be on a 5 × 7 card (a short link is 25 squares, a pre-filled Google Form 49), our test of foil (a lamp reflection across a fifth of the code stops every read) and letterpress ink spread, one link per batch to chase replies, and what rep+ - [A QR code on a conference badge or name tag: the contact swap, the session list and what organisers can count](https://b59.link/articles/qr-code-conference-name-badge): What a badge code should open for each job (contact swap, lead scan, agenda), how close a phone must be for each payload (50 cm for a short link, 24 cm for a full vCard on a 30 mm code), our test of badges turned 35-50° away, what lead scanning costs exhibitors ($800 for three app licences at one 2026 show) and keeping links w+ - [QR codes on a market stall: price cards, allergens and the shop that's open after Saturday](https://b59.link/articles/market-stall-qr-code-price-card-allergens-shop): What a market customer scans for (mostly the shop, after the market), what UK and US allergen rules say about information behind a code, a 6 cm code with a short link on an A6 price card, our glare test (a white patch over a tenth of a glossy code stops level M every time), signal at rural and crowded markets, and one link per m+ - [A QR code on a noticeboard poster for a club, class or community event: what to link and when to take it down](https://b59.link/articles/noticeboard-poster-qr-code-club-class-event): How long library, council and parish boards keep posters up (2 weeks to 60 days, A4 or letter), England's 28-days-before and 14-days-after rule for outdoor event signs, a 6-8 cm code with a short link versus 10 cm for a full Google Form address, why two-thirds of over-60s aren't comfortable scanning, what the lin+ - [Links in an email signature: which ones get clicked, and the ones that land you in spam](https://b59.link/articles/email-signature-links-clicks-spam): Signature click rates (0.5 to 4 per 100 emails, all from vendors), the SpamAssassin rules a signature can trip (a short link scores 0 until it points somewhere bad; image-only mail up to 2.8 points), a 6.5 KB generator signature that gets a thread clipped by Gmail after about 13 messages instead of 63, why 80-95% of clicks from business inboxes+ - [QR codes on plant labels and garden-centre signs: care pages that survive sun, water and a season outdoors](https://b59.link/articles/qr-code-plant-labels-garden-centre-signs): How big a QR code can be on a 13, 16, 20 or 25 mm plant stake (0.55 mm squares with a short link on 20 mm, 0.32 mm with a tagged care-page address), how close people must hold it, which label materials and inks last outdoors, why faded print on a dirty label fails when either alone doesn't, a care page that changes wit