Invoices and receipts
Small-business tools, booking apps and marketplaces: the customer or the shop prints the invoice that your backend already generates.
What people print from apps
Tickets, labels and badges
Event tickets, shipping labels, name badges, check-in passes with a QR code. Render them as a PDF in the right paper size and print in two taps.
Reports, worksheets and recipes
Weekly reports, school worksheets, training plans, recipes and checklists that people still want on paper or as a tidy PDF.
Certificates and confirmations
Course certificates, booking confirmations and signed agreements, printed or saved as PDF straight from the screen where the user sees them.
Prompt for Bolt
Paste this into Bolt to implement the web-app side. Review the result, publish, then test inside the WebViewGold app.
Prompt to paste into Bolt
Add native printing of tickets for the WebViewGold app wrapper. 1) Create a Netlify Function print-ticket served at the clean path /print/:token (no query string) that verifies an HMAC-signed token with PRINT_SIGNING_SECRET from the environment, loads the ticket from Supabase with the service role key and returns a PDF (Content-Type application/pdf) sized for A6 or 4 x 6 inch paper. 2) Add a Netlify Function print-link that, for the logged-in user, returns https://OUR_DOMAIN/print/TOKEN with a token valid for 5 minutes. 3) On the ticket page add a Print button: when navigator.userAgent contains WebViewGold, fetch the link and navigate to "printitem://?jobName=" + encodeURIComponent("Ticket " + code) + "&printItem=" + link; in a browser, open the link instead. 4) Never expose the signing secret or the service role key in a VITE_ variable. 5) Show a spinner while the PDF is prepared.
Great work! Never coded anything but managed to work with this. Easy and fast! Also with great help from the creators!
Add a working print button
About an hour, most of it for the PDF template.
Render a printable file
Generate the invoice, ticket or report as a PDF (or PNG/JPG) on the server, in the page size of the paper you expect: Letter or A4, a 4 × 6 inch label, a ticket. Images are scaled to fit the page on Android.
Make the URL reachable without a login
The app downloads the file from
printItemitself, and the docs require that URL to be publicly reachable from the device. Use a short-lived signed link and keep it free of&and#, for examplehttps://app.yourdomain.com/print/8f3a2c.pdf.Call printitem:// from the button
Navigate to
printitem://?jobName=Invoice%20%23123&printItem=https://…/invoice.pdf.printItemis required,jobNameis optional and must be URL-encoded (Android shows "Print Job" without it). KeepprintItemlast, as in the docs.Keep the browser path
Detect the app through the custom user agent you set in WebViewGold. In a normal browser, keep
window.print()or open the PDF so its viewer can print it.Test with a printer and with Save as PDF
Print a multi-page PDF and an image on iPhone and Android, and try Save as PDF. Check margins, page breaks and the job name in the print queue.
A print helper for app and browser
The helper asks your server for a short-lived file URL and picks the right path. For your Bolt app, the PDF route belongs in: Supabase, Firebase or your own API.
javascript
var IN_APP = navigator.userAgent.indexOf("WebViewGold") !== -1; // your custom user agent token
async function printInvoice(invoiceId) {
// the server renders a PDF and returns a short-lived, publicly reachable link
var res = await fetch("/api/invoices/" + invoiceId + "/print-link", { method: "POST" });
var link = (await res.json()).url; // e.g. https://app.yourdomain.com/print/8f3a2c.pdf
if (IN_APP) {
var job = encodeURIComponent("Invoice " + invoiceId);
window.location.href = "printitem://?jobName=" + job + "&printItem=" + link; // printItem last
} else {
window.location.assign(link); // browser: the PDF viewer prints it
}
}Good to know before you ship
- Printing itself triggers no permission prompt. The file is cached temporarily on the device; on Android it is deleted once the job is queued.
- Bluetooth receipt printers that support neither AirPrint nor the Android print service are not covered: they need the vendor's SDK, which means a custom native integration.
- Keep personal data out of file names and job names; print queues and printer logs keep them.
- Printing is a credible native feature for business apps (invoices, tickets, labels). List it in the review notes with your other native features; on its own it will not carry a Guideline 4.2 argument.
Frequently asked questions
Why does window.print() do nothing in the app?
App WebViews do not implement the browser print command the way Safari and Chrome do, so the call usually has no effect. printitem:// hands a file to the native print system instead, which also handles multi-page PDFs more reliably.
Can users save a PDF instead of printing?
Yes. Android offers Save as PDF in the print dialog, and on iOS users can save or share the document from the print options. Many people use exactly that to file invoices.
Can I print the screen the user is looking at?
printitem:// prints a file from a URL. Render that view as a PDF on the server (most stacks have a PDF library or a headless browser for this) and pass the link; it also looks better on paper than the web layout.
Does the file have to be public?
It has to be reachable from the device without your login. A signed link that expires after a few minutes gives you that without exposing invoices permanently.
Three ways to get your app into the stores
Same result, different amount of work on your side. All three come with the approval guarantee and 24/7 human support.
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