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A3 Picture Frames

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Made-to-order A3 picture frames (29.7 × 42 cm / 297 × 420 mm) — handmade in the UK for posters, art prints, large certificates and photography.

What size is an A3 frame? An A3 frame holds artwork measuring 29.7 × 42 cm (297 × 420 mm) — exactly twice the area of A4. Choose a style below in any of our eight finishes, then select A3 on the product page.

Shop A3 picture frames

Each of our frames is available in A3 — a popular choice for posters, prints and statement wall pieces. Pick your style and finish.

What fits an A3 frame?

Your item Fits an A3 frame?
A3 print or poster (29.7 × 42 cm) Yes — exact fit
Large certificate / degree Yes — ideal for A3 presentation documents
A4 print with a wide mount Yes — an A3 frame with an A4 aperture gives a generous border
16 × 12″ print Close but not identical — choose a 12×16 frame for an exact fit
Framing an A4 print in an A3 frame? It’s a popular look — the extra space is filled with a mount, giving your A4 artwork a wide, gallery-style border. Add the mount when you personalise your frame.

Choose your finish

A3 frames are handmade in all eight finishes — Jet Black, Chalk White, Devon Oak, Limed Oak, Natural Ash, Walnut, Brass and Forest Green. Black and walnut frame posters and prints beautifully; natural ash and limed oak keep things light and contemporary.

Add a mount or upgrade the glazing

Mount an A4 image inside an A3 frame for a premium border, or upgrade the glazing — both are chosen as you personalise your frame. Need an in-between or oversized format? Design a made-to-measure frame to any size.

A3 picture frame FAQs

What are the exact dimensions of an A3 frame?
An A3 frame holds artwork 29.7 × 42 cm (297 × 420 mm) — double the area of A4. The outer size depends on the moulding width you choose.
Is an A3 frame good for posters?
Yes — A3 is one of the most popular poster and art-print sizes, large enough to make a statement without dominating a wall.
Can I put an A4 print in an A3 frame?
Yes, with a mount. The mount fills the extra space and gives your A4 artwork a wide, professional border. Add it when you personalise your frame.
Do A3 frames come ready to hang?
Yes — every A3 frame includes fixings and can be hung portrait or landscape.

Related: A4 Picture Frames · Picture Frame Size Guide · Design a custom size

Handmade in the UKBy our own framers
Made to your sizeStandard or bespoke
Quality materialsAcrylic glazing & solid backing
Carefully packagedProtected for delivery