Framing a poster is not simply a matter of choosing a frame that looks attractive. The frame must fit the print, suit the paper and artwork, control reflections, protect the surface and work with the room where it will hang. This guide compares UK frame sizes, mounts, glazing and hanging methods so you can make a considered choice for a single poster, a framed art print or a complete gallery wall.
Overview
The simplest framing option is a frame that matches the print’s exact finished size. For example, an A2 print generally needs a frame with an internal aperture close to A2 dimensions, unless you plan to add a mount. A mounted print needs a larger frame because the mount board creates a border around the artwork.
When shopping for poster frames UK retailers may describe the product by the artwork size, the glass size or the external frame size. These are not always the same. Before ordering, check the listed internal or rebate measurement—the space where the print sits—and compare it with the actual trimmed size of your poster.
Standard ISO paper sizes are useful starting points:
| Print size | Approximate dimensions | Typical framing approach |
|---|---|---|
| A0 | 841 × 1189 mm | Large wall display; consider acrylic glazing for easier handling |
| A1 | 594 × 841 mm | Statement poster or exhibition display; check wall and frame weight |
| A2 | 420 × 594 mm | Versatile size for art prints, photographs and home decor |
| A3 | 297 × 420 mm | Suitable for smaller walls, shelves and gallery groupings |
These dimensions describe the paper size, not necessarily the visible image area. A design may include a white border, bleed or cropping allowance. If the print is valuable, irreplaceable or made with archival inks, avoid assuming that a standard frame will provide adequate protection without checking the mount and glazing materials.
How to compare options
Compare framing choices in this order: fit, support, protection, appearance and practicality. A beautifully finished frame is still unsuitable if it bends a large poster, covers important artwork or allows the print to touch damp glazing.
1. Confirm the measurements
Measure the print after it has rested flat. Record its width and height in millimetres, then note whether the measurement includes a printed border. For a rolled poster, allow it time to flatten rather than forcing it into a frame. If the image is not square to the paper, decide whether a narrow edge should be hidden or whether a custom-size poster frame is more appropriate.
2. Decide whether to use a mount
A mount, also called a mat in some contexts, places a board border between the print and the glazing. It can give a small photograph or art print more visual space and helps keep the artwork away from the glass or acrylic. A mount also changes the frame size: an A3 print with a border will need a frame larger than A3.
3. Match the glazing to the setting
Glass is rigid and provides a clear viewing surface, while acrylic is lighter and can be a practical choice for large frames, delivery or rooms where breakage is a concern. Acrylic can scratch more easily, so it should be cleaned with a suitable soft cloth and the manufacturer’s recommended method.
Standard glazing may show reflections from windows and lights. Anti-reflective glazing can improve visibility, particularly for dark artwork, brightly lit rooms and prints hung opposite a window. It may alter the appearance or cost of the frame, so compare the viewing benefit with the location and value of the artwork. For more detail on print surfaces, see the guide to matte, gloss and fine art paper.
4. Consider the frame profile and depth
A narrow profile can keep a modern poster visually light, whereas a wider or deeper frame can give a substantial art print more presence. The frame must also have enough rebate depth for the print, mount board and backing. This is especially important when framing thick fine art paper, multiple prints or a mounted artwork.
Feature-by-feature breakdown
Mount board and border spacing
Choose a mount border that supports the composition rather than competing with it. A generous border can make a small print feel deliberate, while a narrow border may suit a clean poster design. The lower border is sometimes made slightly deeper to balance the artwork visually, but consistent borders on all four sides are a straightforward choice for photographs and graphic prints.
Use acid-free or conservation-oriented mount materials when long-term presentation matters. The exact specification should be confirmed with the framer or supplier, particularly for original artwork, signed pieces and archival reprints.
Backing and fixing
The backing should hold the print flat without creating pressure marks. Avoid adhesives directly on the artwork unless they are specifically designed for reversible art mounting. For valuable or delicate prints, ask about archival mounting methods. A poster intended for short-term event use may need a simpler approach than a fine art reproduction intended to remain on display for years.
Sunlight, humidity and location
Direct sunlight can gradually affect paper and inks, even when the frame looks closed. Keep framed prints away from strong, prolonged sunlight where possible. Kitchens, bathrooms and unheated rooms may expose paper and backing materials to changing humidity. A dry interior wall with stable conditions is generally a more forgiving location than a damp or steamy space.
Hanging hardware
Hardware should match the frame’s size and weight and the wall surface. Large A0 and A1 frames may need more secure fixing than a small A3 frame. Follow the frame maker’s instructions and check for cables, pipes and other hazards before drilling. Two fixing points can help a wide frame remain level, while a picture rail may be useful in properties where wall damage needs to be limited.
Best fit by scenario
| Print or room | Practical choice | What to check |
|---|---|---|
| Photo poster in a living room | Simple frame with a mount and low-reflection glazing if near a window | Image crop, visible border and glare at viewing height |
| Fine art print or reproduction | Conservation-oriented mount and protective glazing | Acid-free materials, safe mounting and direct sunlight |
| A1 or A0 poster | Rigid frame with suitable backing; acrylic may reduce overall weight | Internal dimensions, wall fixings, transport and frame depth |
| Gallery wall | Coordinated frames with a consistent gap between pieces | Overall layout, portrait and landscape orientation, visual balance |
| Short-term event poster | Lightweight, economical frame or display solution | Quick installation, handling and whether glazing is necessary |
| Personalised poster gift | Frame that complements the recipient’s room and print colours | Exact finished size and whether the design has a printed border |
For a gallery wall, lay the frames on the floor first and photograph the arrangement before fixing anything. Start with the largest piece, then build around it using a consistent gap. Matching frames create a structured look; varied frames can work well when one element—such as colour, mount style or spacing—ties the arrangement together.
Measurement worksheet
Use this short worksheet before ordering a frame or requesting custom poster framing:
- Print width: ____ mm
- Print height: ____ mm
- Printed border included? Yes / No
- Frame with or without a mount: ____
- Desired visible border: ____ mm on each side
- Required internal frame size: ____ mm × ____ mm
- Glazing preference: standard glass / acrylic / anti-reflective option
- Display location and light level: ____
- Approximate frame weight and suitable wall fixing: ____
If the required dimensions do not match a standard frame, custom size poster printing and custom framing can avoid awkward cropping or oversized borders. Before sending artwork for printing, check the file dimensions and intended finished size in the poster printing file setup guide.
When to revisit
Revisit your framing choice whenever the artwork, room or display conditions change. A new print may have different dimensions, a deeper paper stock or a surface that benefits from reduced reflection. Moving a frame closer to a window, radiator or humid room can also change the protection it needs.
Check the print periodically for bowing, slipping, dust, condensation or visible pressure marks. Clean the glazing rather than the artwork, using a soft, lint-free cloth and a method suitable for the material. If moisture appears inside the frame, remove it from the damp location and seek advice before resealing it.
When planning a new gallery wall, measure the available wall area again rather than relying on an old layout. Frame ranges, glazing choices and delivery arrangements can change, so confirm internal dimensions, frame depth and fixing requirements before purchasing. A few minutes spent checking those details can prevent cropped artwork, unsuitable mounts and unnecessary returns.
Practical next step: measure your print in millimetres, decide whether you want a mount, then choose glazing based on light, size and handling needs. Keep the completed worksheet with the artwork so it remains useful if you reframe the piece or expand your collection later.
