Convert PowerPoint from 4:3 to 16:9
Drop an old 4:3 deck and get it back widescreen. Pictures keep their proportions, shapes move with the slide, nothing is stretched unless you ask. Free.
Three steps, done
Upload the 4:3 deck
Drop a .pptx. The current slide size is read and shown, e.g. 4:3 · 10 × 7.5 in.
Choose how to scale
Scale to fit keeps everything visible and centred. Scale to fill covers the whole widescreen slide. Stretch fills it exactly and changes proportions.
Download the 16:9 deck
Press Convert and the widescreen .pptx downloads: slides, layouts and masters all at 13.33 × 7.5 in.
Your deck, with a voice
Narrated PowerPoint
Every slide voiced by an AI voice, timed to auto-advance. Download the .pptx and press play.
Narrate every slide of my PowerPoint with a natural voice and give me the narrated .pptxMP3 narration
The whole deck as one clean audio file, or one clip per slide.
Read my PowerPoint aloud and give me the MP3Deck from a brief
Describe the talk. Noty writes the slides, designs them and narrates them.
Make me a narrated presentation aboutYour own voice
Clone your voice once and every deck sounds like you presenting.
Narrate my deck in my cloned voiceVideo export
SoonThe narrated deck rendered as an MP4 for YouTube, LMS or email.
Tell Noty you want videoFrom boxed-in slides to full widescreen
Before
A 4:3 deck on a 16:9 screen
Black bars down both sides of the projector, and a template that looks dated next to everything else on the screen.
After
A 16:9 deck, pictures in proportion
Every slide, layout and master at widescreen size, with shapes and images scaled evenly and centred.
New shape. Now a voice.
An old deck brought up to widescreen is often one that’s about to be reused. Tell Noty in the Studio chat and every slide gets a voiceover, timed to move on by itself.
What happens to your slides
Going from 4:3 to 16:9 makes the slide a third wider at the same height. The tool changes the slide size, then moves and resizes every shape to match, in one of three ways.
Scale to fit
Every shape, picture and text box moves and resizes by the same factor, the one that keeps the whole slide visible, and the content is centred. Nothing is distorted or cut off; the new edges show the slide background.
Scale to fill
Everything grows by the factor that covers the whole new slide, then is centred. No empty edges, but content near the edges can end up partly off the slide.
Stretch
Positions and sizes are stretched across and down separately, so the layout fills the new slide exactly. Pictures, circles and icons change proportion, which is why it isn’t the default.
Why font sizes stay the same
Text boxes are resized, but the point size of the text is left alone. Scaling fonts by 0.75 would turn 18 pt body text into 13.5 pt, and it’s easier to enlarge a few titles by hand than to fix every text box that got too small. If a box is now too narrow, the text wraps onto another line.
Layouts and masters too
The slide masters and layouts are resized along with the slides, so new slides you add afterwards come out in the new shape with their placeholders in the right place.
Tables, groups and charts
Grouped shapes scale as a unit, table columns and rows scale with the table, and charts are resized as objects; their contents redraw at the new size.
Going widescreen, three ways
PowerPoint’s Slide Size dialog does this too, when you have PowerPoint to hand. Its Maximize and Ensure Fit choices are the same idea as Scale to fill and Scale to fit here.
| Notevibes | PowerPoint Slide Size | Rebuild by hand | |
|---|---|---|---|
| Pictures kept in proportion | |||
| Layouts and masters resized | Manual | ||
| No PowerPoint needed | |||
| Narrate the deck with AI voices | |||
| Cloned voice | |||
| Video export | Soon | Export only | Export only |
Convert the deck above for free. When it should present itself, Noty narrates every slide and hands back the finished .pptx.
Fit or fill: picking the right option for a 4:3 deck
A 4:3 slide is 10 inches wide, a 16:9 slide 13.33. At the same height, the widescreen slide has 3.33 inches of extra width to account for.
Scale to fit keeps the content at its original size and centres it, leaving about 1.67 inches of background on each side. Nothing is lost, and the slides look like the original with a wider frame. Full-width elements, like a title bar across the top, end short of the edges; stretch those few in PowerPoint afterwards.
Scale to fill enlarges everything by a third so it spans the full width, then centres it. The sides are filled, but the top and bottom eighth of each slide move off the slide, so it suits decks with generous margins.
Stretch pulls everything wider by a third and keeps the height. Text boxes and bars look natural stretched; photos, logos and circles do not. Use it for text-heavy decks with few pictures.
Widescreen, and now narrated
Noty writes the narration from your slides, voices every one of them in a natural voice or yours, and hands back a PowerPoint that plays itself.
Free to try · No credit card required
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Frequently Asked Questions
How do I change a PowerPoint from 4:3 to 16:9 without distortion?
Drop the deck above and keep the default, Scale to fit. Every shape and picture is scaled by the same amount in both directions, so nothing is squashed or stretched, and the result is centred on the wider slide.
What size is a 16:9 slide?
13.33 × 7.5 inches (33.867 × 19.05 cm), PowerPoint’s default widescreen size. The converted deck uses exactly that.
Why are there empty areas at the sides?
With Scale to fit the content keeps its size and sits in the middle, so the extra width shows the slide background. Choose Scale to fill to cover it, or widen full-width shapes like title bars in PowerPoint.
Does it change font sizes?
No. Shapes, pictures and text boxes are moved and resized, but text keeps its point size. If a text box got narrower, its text wraps onto more lines; adjust the few that need it in PowerPoint.
Will my images be distorted?
Not with Scale to fit or Scale to fill: both scale width and height by the same amount. Only Stretch changes proportions, and only if you choose it.
Is my deck uploaded?
No. The file is processed in your browser and never leaves your computer.
Can Notevibes narrate the deck too?
Yes. Tell Noty in the Notevibes Studio and it writes narration for every slide from the slide text or speaker notes, voices it in a natural AI voice or your own cloned voice, and hands back a narrated .pptx that auto-advances, plus the MP3.