Most advice on this question is useless. "Keep it clean." "Use whitespace." "Make it modern." If you knew how to do those things, you wouldn't be searching.
So here are twelve specific changes — actual values, actual rules — roughly ordered by how much visible difference each one makes. You don't need all twelve. The first four alone will move a site from "someone's first attempt" to "a real company built this."
The underlying principle, since it explains every item below: looking professional is mostly about consistency and restraint, not talent. Amateur sites aren't ugly because their creator lacked taste. They're ugly because too many decisions got made independently — a color here, a font there, spacing chosen per-element — and the result has no coherence. Professionals don't make better individual choices. They make fewer choices and repeat them.
1. Cut your color palette down
The fastest tell of an amateur site is too many colors. Count every distinct color on your site right now — backgrounds, text, buttons, borders, icons, links. If it's more than about six, that's your first problem.
What you want: one background (white or a warm off-white like #FAF9F6), one near-black for text, two or three grays for secondary text and borders, and one accent color. That's it. The accent appears on primary buttons and links and essentially nowhere else.
The restraint is the professional part. Multiple bright colors read as a template; one confident accent reads as a brand.
2. Use one font family, two weights
Two fonts is the maximum, and one is safer. If you use two, make them clearly different in role — one for headings, one for body — never two similar sans-serifs, which just looks like an accident.
Within your font, use two or three weights: regular for body, semibold or bold for headings. Skip light weights entirely; they look elegant in mockups and unreadable on real screens.
Safe, professional, free: Inter, Söhne, Public Sans, or system fonts. If you can't decide, Inter at 400 and 600 is a defensible answer for almost any site.
3. Make your headings noticeably bigger
Amateur sites are timid with type. The page title is 24px, the section headings are 20px, the body is 16px, and everything blurs together.
Real hierarchy has bigger jumps than feel comfortable. A page title at 48–64px on desktop is normal, not shouty. Section headings at 28–32px. Body at 16–18px. When your headline is genuinely dominant, the page suddenly looks designed — because the visitor's eye now knows where to start.
4. Add far more space than feels right
Cramped is the single most amateur-looking quality a site can have, and it's the easiest to fix.
Concrete targets: 80–120px of vertical space between major sections. 16–24px of padding inside buttons and cards. Line height of 1.5–1.7 on body text. And a maximum line length of about 65–75 characters — text that runs the full width of a wide monitor is exhausting to read and instantly signals that nobody thought about it.
Space is the cheapest luxury signal there is. Expensive-looking sites are mostly just sites with more room in them.
5. Pick two border radii and stop
Count your corner roundness values. If buttons are 4px, cards are 12px, inputs are 8px, images are 16px, and something's a full pill, that inconsistency reads as sloppy even to people who can't articulate why.
Choose two: a small one (6–8px) for buttons and inputs, a larger one (12–16px) for cards and containers. Apply them everywhere. Same logic for shadows — one subtle shadow style, or none at all with 1px borders instead.
6. Fix your text contrast
Light gray text on white is the most common readability failure on the web, and it comes from copying the look of design portfolios shot on bright calibrated monitors.
The rule is measurable: body text needs a contrast ratio of at least 4.5:1 against its background. In practice, anything lighter than about #767676 on white fails. Run your text colors through a free contrast checker — if your body copy is failing, darkening it is a five-minute fix that improves both professionalism and accessibility. We wrote a full breakdown of how contrast ratios work if you want the details.
7. Replace stock photos with something real
Generic stock photography — smiling people in a bright office, handshakes, abstract technology gradients — actively signals "template." Visitors have seen these images on a thousand sites and pattern-match instantly.
Better options, in order: real photos of your actual product, team, or work; a screenshot of the thing you're selling; simple custom graphics or illustrations; or nothing at all. A clean section with strong typography and no image beats a section with a bad stock image every time.
8. Give every button one job
Look at any screen and count the solid, filled, colored buttons. If there's more than one, they're competing.
The rule: one primary action per screen, styled as a solid filled button in your accent color. Every other button becomes an outline or ghost style. Secondary actions can even be plain text links. This isn't just aesthetics — it's how visitors know what you want them to do.
9. Write real button labels
"Submit," "Click here," and "Learn more" are placeholders that shipped. Replace them with what actually happens: "Start free trial," "Get the guide," "Book a call," "See pricing."
Same for headings. "Welcome to our website" and "Our Services" are content-free. Say what you do and who it's for. Professional copy is specific copy — and vague copy makes even a well-designed site feel like a shell.
10. Fix the mobile view properly
Not "it doesn't break on mobile" — actually good on mobile. The usual failures: text too small to read (body should never go below 16px), tap targets too close together (44px minimum, with real space between them), horizontal scrolling from something overflowing, and desktop-sized padding crammed into a phone screen.
Most of your traffic is likely mobile. A site that looks polished on desktop and cramped on a phone is, for most visitors, just a cramped site.
11. Handle the details nobody notices until they're wrong
These are small, and their absence is what makes a site feel unfinished:
- A favicon (browser tabs showing a blank page icon look abandoned)
- Consistent capitalization in nav and buttons — pick sentence case or title case and hold it
- Proper page titles for each page, not "Home | Untitled"
- Working hover states on everything clickable
- A visible focus state for keyboard users
- Error and empty states that say something useful instead of nothing
12. Make it load fast
Speed reads as quality. A site that takes four seconds to show anything feels cheap regardless of how it looks once it arrives.
The usual culprit is images — a 4 MB hero photo that should be 300 KB. Compress everything (resize to the maximum size you actually display, then run it through a compressor), use modern formats, and lazy-load anything below the fold. This is often the single biggest speed win available and it takes minutes.
How to know which ones your site needs
Reading a list like this, everything sounds applicable. The harder question is which of the twelve are actually costing you — and that's difficult to answer about your own site, because you've been looking at it long enough to stop seeing it.
That's the problem Klyxx solves. Upload a screenshot or paste your URL and it evaluates your interface across sixteen dimensions — including most of what's on this list — then returns severity-ranked findings with the specific fix for each, written as prompts you can paste straight into Cursor, Lovable, v0, or Bolt.
Find out which of these your site actually needs. Get a prioritized list of specific fixes in under a minute. Try Klyxx free.
None of the twelve above requires design talent. They require deciding on a small set of values and applying them consistently — which is a discipline, not a gift. That's genuinely good news if you're a builder rather than a designer: this is a solvable problem, and most of it is solvable this afternoon.