Most cluttered decks are not the result of bad taste. They are the result of no system. Every slide gets built from scratch, so titles shift by a few pixels, five font sizes creep in, and a rainbow of colors appears by slide 12. The fix is not artistic talent. It is three repeatable rules: a grid, a limited type scale, and a three-color palette.

This guide gives you the exact numbers to apply in Google Slides and PowerPoint, plus before-and-after explanations of the most common mistakes non-designers make with spacing, contrast and text density.

The three presentation design tips that fix 90% of ugly slides

1. One grid for the whole deck: same margins, same title position, same column widths on every slide.
2. Four font sizes maximum, built from a single scale, with two typefaces at most.
3. Three colors only: one dominant, one neutral, one accent, applied in a 60/30/10 ratio.

Everything else (icons, photos, charts, transitions) is decoration on top of that structure. If the structure is wrong, no amount of decoration saves the deck. Background reading: https://blog.thenounproject.com.

Rule 1: Build every slide on the same grid

Why decks look messy without a grid

When a viewer clicks from slide to slide, elements that move by 10 or 20 pixels create a subtle flicker. The eye reads that as sloppiness even if it cannot name the problem. A grid removes the flicker: titles stay locked in place, and only the content changes.

The numbers to use

Standard widescreen slides are 16:9. In PowerPoint that is 13.33 x 7.5 inches (33.87 x 19.05 cm). In Google Slides the default is 10 x 5.63 inches (25.4 x 14.29 cm). Convert the rules below to percentages so they work in both.

Element	Rule	PowerPoint 13.33 in	Google Slides 10 in
Outer margin	5% of slide width, all four sides	0.67 in	0.5 in
Columns	12 columns, equal width	0.94 in each	0.7 in each
Gutter	Consistent gap between columns	0.2 in	0.15 in
Title baseline	Same Y position on every slide	Top 0.67 in	Top 0.5 in
Spacing unit	All gaps are multiples of 8 px	8 / 16 / 24 / 32 px	8 / 16 / 24 / 32 px

Twelve columns divide cleanly into halves, thirds, quarters and sixths, which covers almost every layout you will ever need: a full-width statement, a 6+6 comparison, a 4+4+4 three-step process, or an 8+4 chart with commentary.

Before and after: the drifting title

• Before: Slide 3 has the title at 0.4 in from the top and left-aligned at 0.6 in. Slide 4 has it centered. Slide 5 has it at 0.9 in because someone dragged the box to fit a chart. The deck feels improvised.
• After: The title placeholder lives in the Slide Master / Theme, always top-left, always at the same coordinates. Charts get resized instead of the title. The deck reads as one document.

Set it up once

In PowerPoint

1. Go to View > Slide Master.
2. Set your margins and drag guides (View > Guides, then right-click to add vertical guides at your column edges).
3. Position the title and content placeholders once, then delete the layouts you will never use.
4. Use Format > Align and the Selection Pane instead of eyeballing positions.

In Google Slides

1. Go to Slide > Edit theme.
2. Edit the master, then edit only the 4 or 5 layouts you actually need (title, section, content, two-column, full-bleed image).
3. Turn on View > Guides > Show guides and add guides at your column positions.
4. Use Arrange > Align and Arrange > Distribute for everything else.

The rule that saves the most time: never drag a text box to a new position if a layout already exists for that content. Create the layout, then reuse it.

Rule 2: Limit yourself to four font sizes and two typefaces

The type scale

Random sizes (28, 27, 24, 23, 22) look like noise. A scale with clear jumps looks intentional. Use a ratio of roughly 1.25 to 1.5 between levels.

Level	Size (16:9 slide)	Weight	Used for
Display	54 to 60 pt	Bold	Cover slide, section dividers, one big number
Title	32 to 36 pt	Semibold	Slide headline (the takeaway sentence)
Body	20 to 24 pt	Regular	Bullets, labels, short paragraphs
Caption	12 to 14 pt	Regular, 70% opacity	Sources, footnotes, axis labels

Never go below 18 pt for anything the audience needs to read. If your content only fits at 14 pt, the content is too long for a slide, not too big for the font. Move it to the appendix or the handout.

Two typefaces maximum

• Safest option: one typeface, two weights (for example Inter Regular and Inter Bold). It is almost impossible to make this look bad.
• Pairing option: a distinctive font for titles and a highly legible neutral for body text. Pair fonts with different structures, not two fonts that are almost the same.
• Available everywhere: Arial, Calibri, Verdana, Georgia and Times New Roman in PowerPoint; Roboto, Open Sans, Lato, Montserrat and Playfair Display in Google Slides.

Before and after: the font salad

• Before: Titles in Calibri, a quote in Comic Sans, a chart with default Arial labels, and a pasted table still carrying Times New Roman. Four typefaces, none chosen on purpose.
• After: One typeface family for the whole deck. Pasted content is stripped with Paste without formatting (Ctrl+Shift+V). Chart labels are set to the body font at 14 pt. The deck instantly reads as one voice.

Line length, line height and alignment

• Keep lines under 45 to 60 characters. Long lines force the eye to hunt for the next line.
• Set line spacing between 1.2 and 1.4. Default single spacing is usually too tight for projected text.
• Left-align body text. Centered bullet lists create a ragged left edge that slows reading. Center only short headlines and single statements.
• Avoid ALL CAPS for anything longer than three or four words.

Rule 3: Three colors, applied in a 60/30/10 ratio

Choose the three roles first

1. Dominant (60%): usually the background. White, near-white (#F7F7F5) or a deep brand color for dark decks.
2. Neutral / secondary (30%): text and structural elements. Charcoal (#1F2933) rather than pure black, plus one mid-gray for captions.
3. Accent (10%): one saturated brand color, used only to highlight the thing that matters on each slide.

The accent is powerful precisely because it is rare. If every chart bar, every icon and every heading is brand blue, nothing stands out.

Contrast is not optional

• Body text needs a contrast ratio of at least 4.5:1 against its background. Large text (24 pt and above) needs 3:1.
• Light gray text on a white background fails on projectors and in bright meeting rooms almost every time.
• Never place text directly on a busy photo. Add a solid color block or a 40 to 60% dark overlay behind it.
• Do not encode meaning with color alone. Roughly 1 in 12 men has some form of color vision deficiency, so add labels, patterns or direct annotations to charts.

Before and after: the rainbow chart

• Before: A bar chart with eight bars in eight default colors, a legend on the right, gridlines, a border and a 3D effect. The viewer spends five seconds decoding the legend.
• After: Seven bars in light gray, one bar in the accent color, labels placed directly on the bars, no legend, no gridlines, no border. The title says the conclusion: “Q2 renewals grew 34%”. The viewer gets it in one second.

Where to store your palette

In PowerPoint, save your colors under Design > Variants > Colors > Customize Colors. In Google Slides, set them under Slide > Edit theme and add custom hex codes in the theme colors dropdown. Once saved, they appear in every color picker, which stops people from choosing random shades mid-deck.

Fixing text density: the real reason slides feel cluttered

Grid, fonts and colors will not save a slide carrying 120 words. Slides are a visual aid, not a document.

One idea per slide

If your slide title contains the word “and”, you probably have two slides. Splitting a dense slide into three simple ones costs nothing: you are not charged per slide, and three clean slides move faster than one crowded one.

Write headlines, not labels

• Before: “Q3 Results” (a label, tells the audience nothing).
• After: “Q3 revenue grew 18%, driven by renewals” (a headline, delivers the point even if the audience only reads the top line).

Cut bullets to keywords

Aim for a maximum of 4 to 6 bullets per slide and 6 words per bullet. Full sentences on a slide force the audience to read and listen at once, and reading wins. Put the sentences in your speaker notes.

Protect the white space

Keep a clear margin around every element and resist filling gaps. Empty space is what makes the remaining content look important. If a slide feels empty, the answer is usually a bigger element, not an extra one. It is argued more carefully on ucsd.edu.

Common mistakes and their fixes at a glance

Mistake (before)	Why it hurts	Fix (after)
Text touching the slide edge	Feels cramped, can get cropped on some screens	Apply the 5% margin on all four sides
Shrinking the font to fit content	Unreadable from row 5 onward	Split the slide, keep body text at 20 pt or more
Stretched, low-resolution images	Pixelation and distortion look amateur	Use high-resolution images, hold Shift to keep the ratio, crop instead of stretching
Five colors in one chart	No visual hierarchy, slow to decode	Gray everything, accent the one data point that matters
Bouncing, spinning animations	Distracts and dates the deck	Use only fade or appear, and only to reveal steps
Different transitions per slide	Breaks the sense of one document	One transition (or none) applied to all slides
Logo on every single slide	Adds visual noise with zero value	Logo on the cover and closing slide only
Screenshots pasted raw	Mixed colors, tiny text, irrelevant UI	Crop tightly, zoom into the relevant area, annotate with the accent color

A 10-minute workflow for your next deck

1. Outline in text first. Write one headline sentence per slide in a document. No design yet.
2. Set the theme. Grid, margins, 4 font sizes, 3 colors, in the Slide Master or Edit theme.
3. Build 5 layouts: cover, section divider, single statement, two-column, full-bleed visual.
4. Pour the content in using only those layouts.
5. Cut 30% of the words. Move them to speaker notes.
6. Do the squint test. Blur your eyes at each slide: the most important element should still be the one that pops.
7. Test on the real screen if you can, or at least at 50% zoom on your laptop, which approximates the back of a room.

Pre-send checklist

• Every title sits at the exact same position
• No text below 18 pt
• Two typefaces maximum, three colors maximum
• No slide with more than six bullets
• Charts have direct labels, no unnecessary legends
• Fonts embedded (PowerPoint) or the file shared as a link / PDF to preserve layout
• Spell check run, and numbers double-checked against the source

FAQ

What is the 5/5/5 rule in presentations?

The 5/5/5 rule says: no more than 5 words per line, 5 lines per slide, and 5 text-heavy slides in a row. It is a text-density guardrail, not a design law. Its real value is forcing you to move sentences into your speaker notes and keep keywords on screen.

What is the 7×7 rule for presentations?

The 7×7 rule (sometimes 7/7/7) limits a slide to 7 lines of text with a maximum of 7 words per line. In practice, 7 lines is already dense for a projected slide, so treat it as an absolute ceiling and aim for 4 to 6 short bullets instead.

What are the 5 P’s of presentation?

The most common version is Plan, Prepare, Practice, Perform and Present with Passion. Some variants use Purpose, People, Presence, Preparation and Performance. Design fits inside the Prepare stage: the deck supports the message, it does not replace it.

How many fonts should a presentation use?

Two at most, and one is often better. Use weight (regular, semibold, bold) and size to create hierarchy instead of adding new typefaces.

What is the best font size for a presentation?

On a 16:9 slide: 32 to 36 pt for titles, 20 to 24 pt for body text, and never below 18 pt for content the audience must read. Captions and sources can sit at 12 to 14 pt because they are reference material, not reading material.

Should slides have a light or dark background?

Light backgrounds work better in bright rooms and for printed handouts. Dark backgrounds work well in dim rooms and for image-heavy decks. Pick one and use it for the entire deck, and check that your contrast ratio still passes 4.5:1 for body text. Much the same conclusion turns up on garrreynolds.com.

Are Google Slides and PowerPoint different for design?

The principles are identical. PowerPoint offers finer control (Slide Master, alignment tools, font embedding, Morph transition), while Google Slides is easier for real-time collaboration and guarantees the same rendering for everyone with the link. Set your grid, type scale and palette in the theme of whichever tool you use, and the results are equivalent.

How many slides should a presentation have?

Plan for roughly one minute per slide as a default. A 20-minute talk sits comfortably at 15 to 25 slides when each slide carries one idea. Simple slides can pass in seconds, so slide count matters far less than the number of ideas you are asking the audience to absorb.

Key takeaway

Professional slides are not the product of design talent, they are the product of constraints. Lock the grid, lock four font sizes, lock three colors, and give each slide one idea. Once those decisions are made in the theme, every slide you build afterwards is fast, consistent and clean by default.