A3 is 297 × 420 mm (29.7 × 42.0 cm, 11.69 × 16.54 in), 3508 × 4961 px at 300 dpi. With 3 mm bleed, make the file 303 × 426 mm (3579 × 5031 px). Download the free A3 template.
Key Takeaways
10 min read
- 1A3 Paper Dimensions: The Numbers You Actually Need
- 2When South African Businesses Choose A3
- 3A3 vs A4: Making the Right Choice
- 4A3 Print Products Available in South Africa
- 5How Much Does A3 Printing Cost in South Africa?
- 6Setting Up A3 Files for Print
A4 works fine. It's fine for letters, reports, and that stack of flyers you've been handing out at trade shows.
But here's the uncomfortable truth: "fine" doesn't make you memorable.
When a property agent walks into a showing with A4 neighbourhood comps, the seller yawns. When a retailer tapes A4 promotions to the window, pedestrians keep walking. When an architect submits A2 drawings on A4 — they get sent back.
There's a reason the pros reach for something bigger. In South Africa, that something is A3.
A3 (297 × 420mm) is the first step up from everyday paper. It's not huge — it still fits under your arm — but it's large enough to command a room, display artwork properly, and present information without squinting. A3 is where print stops being documentation and starts being communication.
Printulu Pro Tip
A3 Paper Dimensions: The Numbers You Actually Need#
Before you order anything, know the exact measurements. Here they are:
| Measurement | Value |
|---|---|
| Millimetres | 297 × 420 mm |
| Centimetres | 29.7 × 42.0 cm |
| Inches | 11.69 × 16.54 in |
| Pixels at 72 DPI | 842 × 1191 px |
| Pixels at 150 DPI | 1754 × 2480 px |
| Pixels at 300 DPI | 3508 × 4961 px |
| Square centimetres | 1,247.4 cm² |
“A3 is exactly double A4. Fold an A3 in half and you get two A4 sheets — no waste, no weird aspect ratios. This is why ISO 216 is elegant: every size halves perfectly into the next.
PPrintulu Academy
What About A3+?#
If you're a designer preparing files for professional printing, you've heard of A3+. Here's the difference:
- 1Standard A3: 297 × 420 mm — the published, usable sheet
- 2A3+ (Super A3 / RA3): 305 × 430 mm — approximately 8mm wider and 10mm taller
A3+ exists because print Bleeds. When you need to print an A3 poster with full-bleed colour to the edge, you need extra paper to trim down to exact size. A3+ gives you that margin.
Use A3+ when:
- 1Your design goes to the very edge of the page
- 2You're getting your A3 professionally printed and need bleed room
- 3The final trimmed size must be exactly 297 × 420mm
Use standard A3 when:
- 1You're printing in-house on an A3-capable desktop printer
- 2You don't need bleed and want the exact published dimensions
When South African Businesses Choose A3#
A4 is the default. A3 is the decision. Here's where SA businesses, designers, and professionals actually use A3:
Property Show Houses#
The property market in Cape Town, Johannesburg, and Durban is visual-first. Agents who show up with A4 information sheets look amateur. Agents who present neighbourhood comparables, floor plans, and development brochures in A3 look like they mean business.
Printulu Pro Tip
Architecture and Engineering#
Architectural drawings in South Africa follow SANS standards — and many SANS-compliant drawings need to display at A3 minimum for site meetings. A contractor on a Joburg construction site cannot read structural steel details on A4.
When your drawings need to communicate across a site office table — A3 is the minimum viable format.
Retail Promotions and Danglers#
Those promotional cards hanging from货架 in Pick n Pay, Checkers, or your local boutique? Most of those are A3 or A3-derived. The size allows product imagery and offers to be read from 2-3 metres away. A4 simply doesn't have the visual weight.
University and College Notices#
Stellenbosch, UCT, Wits, Tuks — the academic world runs on A3 notice boards. A3 posters for campus events, thesis presentations, and research symposia are standard because A3 is large enough to be pinned and read from across a corridor.
Photography and Art Displays#
A3 is the preferred size for photographer portfolios presented to ad agencies in Sandton. It's large enough to see detail and small enough to transport without special framing. A3 art prints are also the sweet spot for gallery submissions and competitions.
Event Signage and Menus#
Premium restaurants, wine estates in Franschhoek, and conference venues in Sandton use A3 for table menus, directional signage, and speaker introductions. A3 gives you the space to design something worth reading.
A3 vs A4: Making the Right Choice#
The honest answer is that most everyday printing doesn't need A3. A4 handles 90% of business communications perfectly well.
But for that remaining 10% — here's the decision framework:
| Scenario | Choose A4 | Choose A3 |
|---|---|---|
| Internal documents | ✓ A4 | |
| Client-facing proposals | ✓ A3 (for impact) | |
| Flyers for mass distribution | ✓ A4 | |
| Posters for window display | ✓ A3 | |
| Handheld promotional cards | ✓ A5/A6 | |
| Event signage visible from distance | ✓ A3 | |
| Architectural drawings | ✓ A3 | |
| General photography prints | ✓ A4/A5 | |
| Portfolio pieces for agencies | ✓ A3 | |
| Restaurant menus | ✓ A3 (if premium) |
Dad Joke Break
Why did the marketing manager upgrade from A4 to A3?
The rule of thumb: If it will be read from further than arm's length, go A3. If it will be held in someone's hands, A4 is probably fine.
A3 Print Products Available in South Africa#
When you order from Printulu or any SA print supplier, A3 is available across a wide product range:
- 1A3 Posters — The most common A3 product. Retail promotions, event posters, office decor. Printed on 130-170gsm silk/matt stock.
- 2A3 Presentation Posters — For conferences, academic presentations, and client pitches. Higher quality stock with optional lamination.
- 3A3 Art Prints — For photographers, illustrators, and artists selling limited editions.
- 4A3 Photographs — Photo prints at A3 are large enough for meaningful display and small enough for affordable framing.
- 5A3 Plans and Drawings — Architectural, engineering, and survey drawings prepared to SANS standards.
- 6A3 Fold-Out Brochures — Luxury brochures and catalogues that open to A3 from an A4 cover. Think high-end property brochures or product catalogues.
- 7A3 Menus — Premium restaurant menus, wine lists, and spa treatment menus.
- 8A3 Danglers — Retail point-of-sale items hanging from shelves and货架.
How Much Does A3 Printing Cost in South Africa?#
A3 printing costs more than A4 because you're printing on more paper. But the per-unit cost premium isn't extreme.
What drives the cost of A3 printing: quantity, paper stock, colour or black and white, and finishing. The shop shows the exact figure for your spec.
Paper stock makes the biggest difference:
- 1130-150gsm: Light posters and hand-outs
- 2170-200gsm: Standard promotional posters
- 3250-300gsm: Premium cards and art prints
- 4Lamination: Adds a production step, so it adds to the cost per unit
Printulu Pro Tip
Setting Up A3 Files for Print#
Before you send your artwork to a printer, check these basics:
Bleed: If your design goes to the edge, set up 3mm bleed on all sides. Your final trimmed A3 should be 297 × 420mm — your file should be 303 × 426mm with bleed.
Colour mode: Always CMYK for print. RGB files look different when printed — colours that look vibrant on screen can appear muted in CMYK.
Resolution: 300 DPI minimum for A3. At actual size, 72 DPI looks fine on screen but will appear pixelated when printed. If your design has fine text or detailed graphics, 400 DPI is safer.
Fonts: Embed or outline all fonts. If the printer doesn't have your font, text will default to a system font — usually with ugly results.
The A3 Moment#
Here's what you've learned:
- A3 is 297 × 420mm — exactly twice the area of A4
- A3 is for print that needs to be seen from a distance or make an impact
- A3+ adds bleed room for professional print jobs
- A3 printing in SA is affordable — especially at volume
- Setting up A3 files correctly means 300 DPI, CMYK, and proper bleed
The next time someone says "I'll just put it on A4" — ask yourself: is that person remembered, or forgotten?
Sometimes the difference between a conversion and a glance is a piece of paper.
Ready to Print A3?#
Get started with A3 printing for your next project:
- 1A3 Poster Printing — Full range of paper stocks and finishes
- 2Signage & Large Format — For anything bigger than A3
- 3Paper Size Guide — The full A-series breakdown from A0 to A10
This guide is part of our Printing Techniques pillar — comprehensive printing knowledge for South African businesses.