Tri-Fold Brochure Size Guide (2026): Panels, Pixels, Print

The standard tri-fold brochure size is a flat 8.5 x 11 in (US Letter) sheet folded into three panels, or the international equivalent: a flat A4 sheet at 297 x 210 mm folded the same way. This guide is for small-business owners, clinics, event organizers, real-estate agents, and service businesses that need exact numbers before sending a file to a printer. Inside: exact sizes in inches, millimeters, and pixels at 300 DPI, the C-fold panel map, a fold comparison, bleed rules, a fill-in copy skeleton, and a pre-print checklist.

Quick answer:

• Flat sheet: US Letter 11 x 8.5 in (279.4 x 215.9 mm) or A4 297 x 210 mm. After folding, the finished brochure is one third of the flat width.
• Pixels at 300 DPI: Letter 3300 x 2550 px, A4 3508 x 2480 px. With 1/8 in bleed per side, Letter artwork measures 11.25 x 8.75 in (3375 x 2625 px).
• Six panels: outside reads flap, back cover, front cover; inside is a three-panel full spread.
• Folds: C-fold is the letter-style fold (6 panels), Z-fold zigzags like an accordion (6 panels), bi-fold is a single fold in the middle (4 panels).
• Print setup: 300 dpi images, CMYK color, 0.125 in (about 3 mm) bleed on every side, 0.125 to 0.25 in safe margin inside the trim, body text 10 to 12 pt.
• Download your printer's own template. Panel widths are not exactly equal thirds, and the tuck-in flap is usually the narrowest.

How big is a tri-fold brochure?

A tri-fold starts as one flat sheet and ends as a finished piece one third of that width. Two flat sheets cover almost every job: US Letter where Letter is standard, and A4 everywhere else. Both fold down to a size that suits counters, mailers, and display racks.

Here are the numbers you will actually type into your document setup. The pixel figures are conversions at 300 DPI (pixels = inches x 300), not printer quotes.

Flat sheet	Size (in)	Size (mm)	Pixels at 300 DPI	Artwork size with bleed
US Letter	11 x 8.5 in	279.4 x 215.9 mm	3300 x 2550 px	1/8 in per side: 11.25 x 8.75 in (3375 x 2625 px)
A4	11.69 x 8.27 in	297 x 210 mm	3508 x 2480 px	3 mm per side: 303 x 216 mm

Letter is the most popular brochure flat size, and it supports trifold, half fold, Z-fold, gate fold, and French fold layouts.

Panel widths: equal thirds is only a baseline

If you divide a Letter sheet into equal thirds you get 3.667 in per panel, which is about 93 mm or 1100 px at 300 DPI. Treat that as a starting point, not a spec: real printer templates make the tuck-in flap slightly narrower than the other panels so the folded edge does not bind. Orb Print's official A4 tri-fold template publishes its panel widths, and they are deliberately uneven.

Panel (outside face, left to right)	US Letter equal-thirds baseline	A4 per the Orb Print template
Flap (tucks inside)	3.667 in / 93 mm / 1100 px	98 mm (about 1157 px)
Back cover	3.667 in / 93 mm / 1100 px	99 mm (about 1169 px)
Front cover	3.667 in / 93 mm / 1100 px	100 mm (about 1181 px)

Panel splits vary by printer, so grab your printer's template before placing anything. UPrinting offers free brochure templates for 8.5 x 11 in (plus 11 x 17, 5.5 x 8.5, 8.5 x 14, and more) in AI, JPEG, PDF, PSD, and PUB formats, and the Orb Print A4 template PDF shows the 98 / 99 / 100 mm split on the sheet.

Which panel is which? The C-fold panel map

The C-fold is the confusing part of every tri-fold order, because the panel you see first is not the first panel on your artboard. Lay the sheet flat and read each face left to right:

Face laid flat	Left panel	Center panel	Right panel
Outside	FLAP (narrowest, folds inward)	BACK COVER	FRONT COVER (widest, lies over the flap)
Inside	INSIDE-LEFT (behind the front cover, widest)	INSIDE-CENTER	INSIDE-RIGHT (behind the flap, narrowest)

What the reader experiences, in order:

1. Closed brochure: the front cover. It should carry the headline, your logo, and one strong image.
2. Open the cover: the inside-left panel is on the left and the flap's outer face on the right, a good spot for a hook or one-line offer.
3. Unfold the flap: the full three-panel inside spread holds your main message in sections.
4. Flip the whole piece over: the back cover holds business name, phone, website, email, social handles, a call to action, and an optional QR code (UPrinting suggests at least 0.8 x 0.8 in, dark on light). If that call to action is "request a quote", our AI quotation generator guide covers the format.

Never put a logo, a face, a price, or a text block across a fold line; folds hide details and split words. Make a plain-paper test-fold mock-up before you approve the file. If six panels are not enough, a company profile template with AI gives you a multi-page document instead.

C-fold vs Z-fold vs bi-fold: which fold do you need?

All three start from a flat sheet, and the difference is only where the folds land. Pick the fold before you design, because panel order changes completely.

Fold	Panels	How it folds	Best suited to
C-fold (letter fold)	6	Right third folds in, left third folds over it; opened flat it looks like a letter that reads like a C	Service overviews, mailers, counter handouts
Z-fold	6	Each third folds back on the next, forming an accordion that reads like a Z from the edge	Step-by-step processes, timelines, sequences
Bi-fold (half fold)	4	One fold down the middle of the sheet (a Letter sheet finishes at 5.5 x 8.5 in folded across the 11 in side, or 4.25 x 11 in folded across the 8.5 in side)	Simple two-page pieces with big imagery

Use C-fold when one panel should hide the rest like a cover, Z-fold when the reading order should walk through steps in one direction, and bi-fold when you want four wide panels. For a longer piece such as a product catalog, page count and image resolution matter more than the fold.

Print setup: bleed, safe zone, fonts, resolution and color

Six settings decide whether the printer accepts your file on the first try:

• Bleed: extend background art 0.125 in (about 3 mm) past every trim edge. UPrinting's design guide uses an 8.75 x 11.25 in document for an 8.5 x 11 in finished sheet; the Orb Print A4 template asks for 3 mm around the artwork.
• Safe zone: keep text 0.125 to 0.25 in inside the trim (the Orb Print template uses 5 mm) and away from the two vertical fold lines.
• Resolution: images at 300 dpi minimum at final size. 72 dpi screen images look soft in print no matter how sharp they look on your monitor.
• Color: design in CMYK for print. RGB files are converted at prepress and colors can shift, especially very vivid, saturated ones.
• Fonts and text: embed fonts, keep body copy at 10 to 12 pt, and use vector logos so they stay crisp at any size.
• File and proof: export a print-ready PDF, confirm the panel order above, and review the online proof at 100 percent scale before approving. Our AI brochure maker walkthrough shows how to check an exported PDF page by page, since a file that looks right on screen can still miss bleed or use the wrong color mode.

UPrinting's tri-fold printing page lists CMYK, 300 dpi, 0.125 in bleed each side, Letter flat size, and the Tri-Fold/Letter Fold option; your printer may differ, so read their spec sheet.

Tri-Fold Brochure Template (Panel-by-Panel Copy Skeleton)

Copy the block below into a text file and fill every [PLACEHOLDER]. Character counts are practical limits that keep copy inside one panel without overflowing the fold.

PANEL 1 - FRONT COVER (outside, right; the only panel most people see first) Headline, 30 to 45 characters: [WHAT YOU DO, FOR WHOM] Subline, 60 to 90 characters: [SPECIFIC RESULT OR OFFER] Logo: [BRAND LOGO FILE] | One image: [STRONG PHOTO OR PRODUCT SHOT] PANEL 2 - BACK COVER (outside, center; contact and call to action) Business name: [EXACT LEGAL OR TRADING NAME] Phone: [PHONE] | Email: [EMAIL] | Website: [URL] Social: [HANDLES] | QR code, min 0.8 x 0.8 in: [DESTINATION URL] Call to action, 40 to 60 characters: [WHAT THE READER SHOULD DO NEXT]

PANEL 3 - FLAP, OUTER FACE (outside, left; seen the moment the cover opens) Hook or summary, 90 to 140 characters: [ONE-SENTENCE PROMISE] Three proof bullets, 40 to 70 characters each: [BENEFIT 1]; [BENEFIT 2]; [BENEFIT 3]

PANEL 4 - INSIDE-LEFT (widest panel; main message part one) Section heading, max 40 characters: [TOPIC OR PROBLEM] Body copy, 250 to 400 characters: [SITUATION, WHAT CHANGES, HOW YOU HELP]

PANEL 5 - INSIDE-CENTER (main message part two) Section heading, max 40 characters: [SERVICES, PROGRAM, OR SCHEDULE] Body copy, 250 to 400 characters: [DETAILS, DATES, PRICING IF APPROVED]

PANEL 6 - INSIDE-RIGHT (narrowest panel; behind the flap) Section heading, max 40 characters: [PROCESS OR NEXT STEPS] Body copy, 200 to 320 characters: [HOW IT WORKS IN THREE STEPS] Closing line, max 60 characters: [REPEAT THE CALL TO ACTION]

Keep paragraphs short, leave white space, and remove any line you cannot verify before printing.

Pre-print checklist

Work through this list once per file, with reasons attached so you know what failure looks like:

• Document size matches the printer's template (Letter or A4, plus bleed), otherwise panels shift and text lands in a fold.
• Bleed reaches 0.125 in / 3 mm past every edge with no white slivers after trimming.
• Text sits inside the safe margin (0.125 to 0.25 in, or 5 mm on the Orb template), so trimming variance cannot clip it.
• Panel order matches the C-fold map: flap, back, front on the outside; inside-left, center, right on the inside.
• No logo, face, price, or key text crosses a fold line, because folds hide details.
• All images are 300 dpi at final size and the file is CMYK, preventing soft photos and color shifts.
• Fonts are embedded and body text is 10 to 12 pt, preventing font substitution.
• QR code is at least 0.8 x 0.8 in, dark on light, and tested from the exported PDF.
• Contact details on the back cover were checked against your live site and phone line.
• A paper test-fold mock-up was folded by hand and the reading order felt right.
• The online proof was reviewed at 100 percent scale before approval, the last point where changes are free.

Build the tri-fold in AiDocX

Instead of starting from an empty artboard, open the AiDocX brochure page and pick the Tri-Fold Brochure template, a 3-column fold layout with front cover, inside flap, and back cover. Tell the AI what your business does and it fills content, colors, and layout; then adjust in the drag-and-drop editor and drop in your own logo image. The print preview offers Tri-fold on Letter landscape (along with Bi-fold on Letter landscape, Flyer, Poster, and Business card 90x50 mm) plus an optional crop-marks toggle, and you export a PDF when done. The PDF is not automatically print-ready, so compare it against your printer's specs and request a proof. Start at app.aidocx.ai.

FAQ

What is the standard tri-fold brochure size?

The standard is a flat US Letter sheet, 11 x 8.5 in (279.4 x 215.9 mm), folded into three panels, or a flat A4 sheet at 297 x 210 mm. Finished width is about one third of the flat sheet, with the tuck-in flap usually narrowest.

What size is a tri-fold brochure in pixels?

At 300 DPI, a flat Letter sheet is 3300 x 2550 px and a flat A4 sheet is 3508 x 2480 px. Add bleed before you set the canvas: Letter with 1/8 in bleed per side is 11.25 x 8.75 in, or 3375 x 2625 px. These are DPI conversions, not printer requirements, so confirm against your printer's template.

What is the difference between C-fold and Z-fold?

A C-fold folds like a letter, one third tucking in and another folding over it, so the opened piece reads like a C. A Z-fold folds back on itself like an accordion and reads in one direction, which suits step-by-step content. Both make six panels; a bi-fold makes four.

How much bleed and safe margin do I need?

Bleed is 0.125 in (about 3 mm) on every side, extending background art past the trim edge. Keep text 0.125 to 0.25 in inside the trim (the Orb Print A4 template keeps text 5 mm inside), and keep everything away from the fold lines. Save the final file as a print-ready PDF and review the proof at 100 percent scale.

How do I make a tri-fold brochure with AI?

Pick a tri-fold template, brief the AI on your business in plain language, let it fill content, colors, and layout, then edit in the drag-and-drop editor, insert your real logo, and export a PDF. Check the panel order, bleed, and color mode against your printer's own specifications before ordering, and request a proof. AiDocX's brochure editor follows that workflow at app.aidocx.ai.

Print specifications vary by provider, so confirm paper size, fold type, bleed, and color requirements with your printer before sending final files; this guide is general information, not legal or financial advice.