HrvatskiMistake 1
Walls of text
Fix: one idea per slide. Move detail to an appendix.
Brand OS Portal
Investor pitch deck design mistakes, and how to fix each one.
Ten design mistakes make a good company look unsure. Each one has a simple fix you can do this week.
Free: your brand in 3 real designs, in 48 hours.
The most common investor pitch deck design mistakes are too much text, mixed fonts and colours, weak charts, a stretched or wrong logo, stock photos that feel fake, and slides that do not match your website.
Content matters most, and design cannot save a weak story. But a messy deck makes an investor doubt that you pay attention to detail. Fix the ten mistakes below before you send.
By Vedran Obradović · Updated 7 November 2026
Design is not the main thing. It still counts.
Investors back teams and markets. They also read the deck as a sample of how you work.
Many advisers say the biggest mistakes in a deck are about content, such as market size and the ask. That is true. A beautiful deck cannot rescue a weak story.
But design is how that story arrives. A deck with three fonts, a stretched logo and walls of text says "no one checked this". If you have no designer yet, the ten fixes below are enough. For the full process, see how to make a pitch deck without a designer.
The ten mistakes, with fixes.
Read each as: what it looks like, what to do.
Mistake 2
Mixed fonts
Fix: two fonts, one for headlines and one for text.
Mistake 3
Colours that fight
Fix: brand colours, accent used once per slide.
Mistake 4
Wrong or stretched logo
Fix: the right file for light or dark, never stretched. See logo usage guidelines.
Mistake 5
Weak charts
Fix: put the point in the title, label the key number, drop extra lines.
Mistake 6
Fake-looking photos
Fix: real people and real product. See brand photography guidelines.
Mistake 7
No match with the website
Fix: same colours, voice and product name as your site.
Mistake 8
Tiny text
Fix: nothing smaller than a size you can read on a phone.
Mistake 9
Cut or stretched images
Fix: keep each image in its real shape.
Mistake 10
No contact on the last slide
Fix: name, email and link on the final slide, so a forwarded PDF still works.
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Run your deck through the list.
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0 of 10 done
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Copy this slide headline pattern.
Clear headlines fix half of the design problems.
Headline pattern
Weak: Market overview Strong: [Who] spends [what] on [problem] every year Weak: The solution Strong: [Product] cuts [task] from [old time] to [new time] Weak: Traction Strong: [Number] customers in [time], [number] still active Rule: the headline is the point of the slide. If it could be a label, rewrite it.
Want the story under the slides sharper? Read positioning statement examples.
When the deck is not a one-off.
After the raise you will need more decks: sales, board and partner.
This is where many teams get stuck. They paid once for a good deck, and now every new deck is a favour from a freelancer. In a Brand OS Portal, Pitch Deck Builder lets you tell your story and get all the slides in your brand, so new decks start from a right base.
A designer is still right for a new identity or a big raise. The portal is for the daily work after. See also pitch deck design.
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This is a real tool from a real Brand OS Portal, on the MTG brand. Change the words and the photo. The design stays on brand.
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Straight answers.
What are common pitch deck design mistakes?
Too much text, mixed fonts and colours, weak charts, a wrong logo, fake-looking photos and no match with the website.
Does design matter in an investor pitch deck?
Content matters most. Design shows care and makes the story easier to follow.
How many slides should an investor deck have?
About ten is a common starting point, with detail in an appendix.
Should I hire a designer for my investor deck?
For a new identity or a major raise, yes. For later decks, set the brand up once so the team can build them.
How do I keep later decks on brand?
Use fixed layouts or a tool that holds your brand. See Brand OS Portal.
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