Pillow Envelopes
£1.08 inc. VAT each
Corrugated Pocket Envelopes & Mailers
£0.74 inc. VAT each
AirPro Envelopes
£0.12 inc. VAT each
Self Seal Envelopes
£11.94 inc. VAT each
Paper Padded Envelopes & Mailers
£0.22 inc. VAT each
Padded Envelopes & Mailers
£0.12 inc. VAT each
Honeycomb Padded Envelopes & Mailers
£1.80 inc. VAT each
Gummed Envelopes
£10.74 inc. VAT each
Folding Inserting Machine Envelopes
£10.74 inc. VAT each
Cardboard Envelopes & Mailers
£0.40 inc. VAT each
Solid Board Cardboard Envelopes & Mailers 278mm x 400mm
£51.48 inc. VAT each
Postage envelopes are the everyday workhorse of business mail, covering everything from invoices and letters to leaflets and small documents. Parcelsend UK stocks a broad range of DL, C5 and C4 sizes in windowed and non-windowed formats, all ready for same-day despatch - browse our DL envelopes to start with the most popular size.
How to choose the right postage envelope
Start with what you're mailing: a folded A4 letter, an A5 leaflet, or a document you'd rather send flat. That decision points you to a size, and from there you can pick a closure and window option.
Size
DL suits a standard A4 letter folded in three, C5 takes an A5 sheet or A4 folded once, and C4 fits A4 documents unfolded - see our size-specific collections for exact dimensions.
Windowed or non-windowed, self-seal or gummed
Windowed envelopes save you printing an address separately, while self-seal closures speed up hand-filled mailings compared with gummed flaps that need moistening.
Why order postage envelopes from Parcelsend UK
All our envelope ranges are UK-stocked for same-day despatch before the daily cut-off, with volume pricing for businesses sending regular mail and free UK delivery over £100. Explore C5 envelopes and C4 envelopes for the full size range.
Key takeaways
- Full range of DL, C5 and C4 envelopes in windowed and non-windowed styles
- Self-seal and gummed closures available
- DL fits A4 folded in three, C5 fits A5 or A4 folded once, C4 fits A4 flat
- UK-stocked with same-day despatch before our daily cut-off
- Volume pricing and free UK delivery over £100
Frequently Asked Questions
What's the difference between DL, C5 and C4 envelopes?
DL is the slim size used for a standard A4 letter folded into three, C5 is roughly half the size of A4 and takes a sheet folded once, and C4 is large enough to post A4 documents completely flat. See our DL envelopes, C5 envelopes and C4 envelopes collections for exact dimensions.
Should I choose windowed or non-windowed envelopes?
Windowed envelopes let the address printed on your letter show through, saving time on address labels for high-volume mailings, while non-windowed envelopes give a cleaner look for personal or premium correspondence.
What's the difference between self-seal and gummed envelopes?
Self-seal envelopes have a peel-and-stick strip that's quicker for hand-filled mail runs, whereas gummed envelopes need moistening to seal - both hold securely once closed.
Can I have postage envelopes printed with my company details?
Yes - see our personalised envelopes collection, where you upload your artwork online and we begin production once you've approved a free sample.
How much can I fit in a postage envelope before I need a parcel instead?
Royal Mail's Large Letter size band covers items up to 353×250×25mm and 750g, which most C4 and smaller envelopes fall within when only lightly filled - anything bulkier will need a parcel-format postal box instead.
Are postage envelopes despatched quickly?
Plain stock postage envelopes are despatched the same day when ordered before our daily cut-off, so regular mail runs are never held up waiting for stock.
