C6 · 114 × 162 mm

C6 Envelopes

A6 Cards, Postcards and A4 Folded Twice. Custom manufactured in 7 paper stocks with full-color printing, foil stamping, embossing, and your choice of closure — factory-direct from EnvelopeDock.

114 × 162 mm C6 Envelope — Custom Manufacturing Options

The C6 envelope measures 114 mm wide × 162 mm high — the smallest of the ISO C-series formats commonly used for business mail. It is sized to hold an A6 card flat or an A4 sheet folded twice, which makes it the natural choice for postcards, small greeting cards, RSVP and reply cards, thank-you notes, and small photo enclosures. Because it is compact, C6 is also economical: less paper per unit, and a lower finished weight for the same mailing. We manufacture C6 envelopes in materials ranging from 100 g/m² woodfree for everyday correspondence up to heavier coated and pearl stocks for invitations and premium stationery.

Typical use case: A6 cards and postcards, A4 folded twice, RSVP and reply cards, small photo enclosures

All c6 envelopes listed below are manufactured to your specification — choose your paper, printing, finishing, and quantity, then request a quote for factory-direct pricing.

C6 Envelope Specifications

Dimensions are given as width × height on the finished, glued envelope.

Property	Value
Dimensions (mm)	114 × 162
Dimensions (inch)	4.49 × 6.38
International equivalent	C6 (ISO 216)
Opening style	Open side (wallet flap)
Common paper weight	100–120 g/m² woodfree
Best for	A6 cards flat, A4 folded twice, postcards and small photos

What fits inside a C6 envelope

Contents	Size (mm)	Fits inside C6?
A6 card or postcard	105 × 148	Yes — flat, with margin
A4 sheet, folded twice	105 × 148.5	Yes — flat
4 × 6 in photo	102 × 152	Yes — with a small margin
A5 sheet	148 × 210	No — too large
A4 sheet, folded once	148.5 × 210	No — too large

Paper Material & Weight Options

Seven paper stocks are available for custom c5 envelopes. Every material below can be combined with your choice of printing and finishing.

Material	Available GSM (g/m²)	Best suited for
Woodfree	80, 100, 120, 140, 160, 200, 250	Everyday business — color or mono printing
Kraft yellow	80, 100, 120, 150, 180, 200, 250, 300, 350, 400	Durable & opaque — blank or single-color
Kraft white	100, 120, 150, 180, 200, 230, 250, 300	Durable & printable — premium business
Art coated	105, 128, 157, 200, 250, 300, 350	High-gloss color — promotions, invitations
Single-coated (white card)	210, 250, 300, 350	Rigid & thick — premium card enclosures
Matte art	105, 128, 157, 200, 250, 300	Low-gloss color — refined business
Pearl ice-white	120, 140, 160, 200, 250, 300, 350	Pearlescent — luxury invitations, commemorative

Printing Color Options

From blank envelopes to full-color CMYK — every printing level is available for custom c5 envelopes.

Print level	Description
Full color (4C)	Four-color CMYK — photographic quality
2 color	Two spot colors
1 color	Single-color text or logo
Blank (no print)	Plain white / kraft natural

Post-Press Finishing Processes

Every finishing option below can be applied to custom c5 envelopes. Mix and match to achieve your desired look and function.

Process	Available options
Lamination	None / Gloss (single-side) / Matte (single-side) / Anti-scratch matte / Soft-touch / Holographic
Varnish	None / Gloss varnish (single-side)
Embossing	None / Standard embossing plate / Deep embossing plate
Flat foil	None / Standard flat foil / Sculpted foil
Foil color	None / Gold / Matte gold / Red gold / Blue gold / Black gold / Silver / Custom color
Tape	None / Double-sided tape / Release tape
Self-adhesive	None / Self-adhesive (gummed flap)

Quantity Tiers & Quote Request

Configure your c5 envelope specifications above, then select a quantity tier and submit a quote request. We respond with an exact price within 24 hours. No prices are published online — every order is quoted individually based on your exact material, printing, and finishing choices.

Quantity	Action
500 pcs	Request Quote →
1,000 pcs	Request Quote →
2,000 pcs	Request Quote →
3,000 pcs	Request Quote →
5,000 pcs	Request Quote →
10,000 pcs	Request Quote →

⚠️ All prices are quoted individually. Configure your specifications above, then submit a request — we respond with an exact quote within 24 hours. No prices are displayed on this page.

Frequently Asked Questions

What size is a C6 envelope?

A C6 envelope measures 114 mm × 162 mm (width × height) on the finished, glued envelope, following the ISO 216 C-series. That is the smallest of the three C formats used for business mail, below C5 and C4.

What fits inside a C6 envelope?

An A6 card or postcard flat, an A4 sheet folded twice, a 4 × 6 inch photo, an RSVP or reply card, or a small thank-you note. An A5 sheet or an A4 folded once will not fit.

Is C6 smaller than C5?

Yes. C5 measures 162 × 229 mm, so C6 at 114 × 162 mm is smaller in both directions — roughly half the area. C6 suits cards; C5 suits A5 documents or A4 folded once.

What is the difference between C6 and DL?

DL measures 110 × 220 mm, so it is narrower and considerably longer — it is designed for an A4 sheet folded in thirds. C6 is wider and shorter, and suits cards and photos rather than folded letters.

Can a C6 envelope hold a 4 × 6 photo?

Yes. A 4 × 6 inch photo is about 102 × 152 mm, which fits within C6's 114 × 162 mm with a small margin on each side. Add a backing board and the fit gets tighter, so test with the actual board.

Does a C6 envelope need special postage?

C6 is a small format and normally mails within standard letter limits, but confirm two things with your carrier: that the piece is above the minimum mailable size, and that the loaded thickness stays within the letter class. Thresholds vary by service and change over time.

Ready to order custom C6 envelopes?

Configure your specifications and get a factory-direct quote within 24 hours. No obligation, free digital proof included.

Request a Quote → Custom Manufacturing →

Explore Other Envelope Sizes

Compare all standard envelope sizes manufactured by EnvelopeDock. Click any size for full specifications, material options, and custom ordering details.

Also see: C-Series Envelope Sizes · Business Envelopes · Printing & Finishes · Custom Manufacturing · Wholesale & Bulk Orders · Key Card Holders