How Franking Machines Work in 2026: A Plain Guide
A franking machine prints proof of postage straight onto an envelope or a label. Instead of sticking on stamps, you weigh the item, choose the service, and the machine prints the right amount. Royal Mail then bills nothing at the point of posting, because you have already paid.
That is the one line version. Here is what actually happens inside the process, checked October 2026.
The parts of a franking machine
Most modern machines share the same basic parts:
- A scale. Either a platform on top or a separate weighing unit. Bigger machines weigh items as they pass through.
- A feed path. Envelopes go in one side and come out the other. Small machines are fed by hand; larger ones feed automatically.
- A print head and ink cartridge. This prints the impression. Each brand uses its own cartridges.
- A screen or keypad. You choose the service, class and any extras here.
- A secure postage meter. This holds your postage credit and records every impression.
- A connection. Machines connect over your network, WiFi or a phone line to download postage and rate updates.
Some machines also seal envelopes, and many print labels for items too thick to feed through.
Step one: load postage credit
Before you can frank anything, the machine needs postage credit. You pay in advance into an account held through your supplier, then the machine downloads that credit.
Royal Mail says you can pay for franking postage by Direct Debit, credit card, or credit accounts with deferred payment terms. Your supplier handles the account, and the machine shows your remaining balance.
When the balance runs low, you top up again. Our guide to topping up franking postage covers the options in more detail.
Step two: weigh the item
Place the envelope or parcel on the scale. The machine reads the weight. Because Royal Mail prices depend on both size and weight, this is where franking saves money: there is no guessing.
You still have to choose the format, though. A letter, a large letter and a small parcel at the same weight cost very different amounts. The machine cannot always tell the size of an item on its own, so check you have picked the right one.
Step three: choose the service
Pick the class and service. Royal Mail lists these services as available through franking:
- 1st and 2nd Class
- 1st and 2nd Class Signed For
- Special Delivery Guaranteed
- Business Mail Advanced
- International Economy, Standard, Tracked, and Tracked & Signed
The machine looks up the price from its built in tariff. When Royal Mail changes prices, your supplier sends a rate update to the machine.
Step four: print the impression
Feed the envelope through, or print a label and stick it on. The machine prints:
- The postage amount
- The date
- A Mailmark 2D barcode
- Your licence details
- Optionally, your company logo or a short message
The machine deducts the postage from your credit at the same moment.
What Mailmark adds
Since 1 January 2023, Royal Mail only accepts franked mail from Mailmark machines. Older "standard" franking machines were decertified.
The Mailmark barcode identifies each item. Royal Mail scans it as the item moves through its network, which helps with tracking and checking that the right postage was paid. It is also why franked prices are lower than stamps: Royal Mail gets data that makes its processing easier.
If you are offered an older machine without Mailmark, walk away. It cannot be used for UK post.
Step five: sort and post
This is the step people forget. Franked mail has to be prepared before posting:
- Separate UK from international mail.
- Separate by product and class, so 1st Class and 2nd Class are kept apart.
- Face envelopes the same way, with the impression in the top right corner.
- Keep tracked and signed items separate.
Royal Mail says this is needed to qualify for the franked prices and avoid penalties. Our guide to preparing and sending franked mail has the full checklist.
Step six: hand it over
You can post franked mail at a Post Office branch, a Royal Mail Customer Service Point, a mail centre, or a business post box. You can also use a public post box if the items are inside a franking outer envelope from your supplier. Royal Mail also offers regular or one off business collections.
Royal Mail now accepts franked mail up to seven days after the date in the impression. That gives you a little breathing room if a batch misses the last post.
Franking vs online postage labels
Online postage, such as Royal Mail Click & Drop, also replaces stamps. The difference is that you print labels from a computer and pay per order, with no machine to lease. That suits low volumes of parcels. A franking machine is faster for daily letters and large letters, weighs items for you, and gets the lower franked prices.
Who you deal with
A franking setup involves three parties:
| Who | What they do |
|---|---|
| Royal Mail | Sets postage prices, carries the mail, authorises manufacturers and maintainers |
| Manufacturer | Makes the machine: Pitney Bowes, Quadient or FP |
| Supplier | Leases or sells the machine, runs your postage account, supplies ink and service |
Sometimes the manufacturer is also your supplier. Often it is an independent dealer. Royal Mail says your franking licence is provided by your franking provider, so you do not apply to Royal Mail separately.
Maintenance and inspection
Royal Mail says maintenance is carried out by its authorised providers, and it publishes a list of authorised inspectors, maintainers and repairers. In practice, your supplier usually handles this as part of the contract, including software updates.
How long does it take to learn?
Not long. Most people are franking confidently within an hour. The hardest part is usually remembering the sorting rules at the end, not using the machine itself.
Is it worth it?
A franking machine saves money on large letters and parcels and a little on standard letters. On 2026 prices, a 1st Class large letter up to 100g costs £2.86 franked against £3.30 with a stamp. A standard 1st Class letter is £1.77 franked against £1.80. Whether that adds up depends on how much you send, which our franking machine prices guide can help you work out.
Facts checked October 2026 against Royal Mail's franking pages and its Mailmark franking tariff of 7 April 2026.