Resize PowerPoint Slide Size

1. 1

   Open your presentation

   Drag a .pptx, .pptm or .potx file onto the page, or browse for it. The file is read on your device and never uploaded.

2. 2

   Choose the new slide size

   Pick one of the seventeen presets, or switch to a custom width and height in inches, centimetres or pixels.

3. 3

   Choose how the content scales

   Fit inside keeps everything on the slide. Fill the slide covers it edge to edge and may crop. Stretch matches the new shape exactly. Keep positions changes only the canvas.

4. 4

   Check the preview

   The before and after panels draw the real slide, so you can see the margins or the crop before you commit.

5. 5

   Download

   Download the resized .pptx. Every picture is carried across byte for byte.

Adjust PPTX dimensions with presets or exact inch values and preview the aspect ratio before export. Change PowerPoint slide dimensions to 16:9, 4:3, or a custom size — 16:9, 4:3 and custom exact inch sizes, standard and widescreen presets, PPTX output. Where most slide resizers stop at rewriting the number stored in the file, this one also decides what happens to the content on the slide, and shows you the answer before you download.

• Seventeen presets: every size PowerPoint's own dialog offers, plus square, portrait and banner for social formats.
• Content scaling: fit inside, fill the slide, stretch, or keep positions — the choice PowerPoint makes you answer in a dialog with no preview.
• A real preview: the current slide and the resized slide drawn side by side, with the cropped area shown rather than described.
• Exact custom sizes: width and height in inches, centimetres or pixels, across the format's full 1-to-56-inch range.
• Untouched pictures: embedded photographs are carried across still compressed and never re-encoded.
• On your device: the presentation is never uploaded, and nothing is stored anywhere.

Changing a slide's shape asks a question that has no single right answer, which is why PowerPoint stops and asks you. This tool asks the same question, gives you two more answers than PowerPoint does, and draws the result first.

• Fit inside — scales every shape down by the same factor until the whole slide fits, then centres it. Nothing is ever cut off. Changing the shape leaves matching margins on two sides. This is the default, and it is what PowerPoint calls Ensure Fit.
• Fill the slide — scales up by the same factor until the content covers the whole canvas, then centres it. There are no margins, and whatever falls past the new edge is off the slide. PowerPoint calls this Maximize.
• Stretch to fill — scales width and height independently so the content matches the new shape exactly. No margins and no cropping, at the cost of distortion. PowerPoint cannot do this at all.
• Keep positions — changes the canvas and leaves every shape exactly where it was, in the same size. Useful when you are matching a template and intend to rearrange the slides yourself.

Whichever you pick, text scales with the shapes rather than staying at its original point size, table rows and columns scale with their tables, and line weights, shadows and text insets scale too — so a resized deck looks like the deck you started with rather than like the deck with bigger boxes and the same small type.

The preset list is PowerPoint's own, in the sizes the paper actually is. PowerPoint's built-in A4 preset produces a 14 by 10.5 inch slide and its Letter preset a 10 by 7.5 inch one, both inherited from a printing pipeline that scaled to fit at print time; here A4 is a 297 by 210 mm slide and Letter is 11 by 8.5 inches, because that is what someone picking them is asking for. Every preset is stored in the file format's own units, so a deck resized here lands on exactly the same numbers PowerPoint writes.

For anything the list does not cover, a custom size takes a width and height in inches, centimetres or pixels. The range is 1 to 56 inches per side — the full span the PowerPoint format defines, which covers a 1 inch banner strip and a 56 inch trade-show poster alike. The controls stop where valid files stop, so it is not possible to build a deck that PowerPoint will refuse to open.

Most presentations start life at 16:9 because that is what PowerPoint defaults to, and most reasons to change come from somewhere the deck has to go next. Converting an inherited 4:3 deck for a modern projector or a video call. Matching a client or conference template exactly, down to the inch, so the slides do not need re-approving. Producing a printable handout at A4 or Letter. Making a portrait 9:16 version for a phone screen or a social story. Building a poster or a roll-up banner in the tool you already know rather than learning a design app. Standardising a set of decks that several people wrote at several sizes before merging them.

A .pptx file is a ZIP archive of XML parts plus the pictures. The slide canvas is a single element in one of those parts, and every shape on every slide carries its position and size in English Metric Units — 914,400 to the inch. Changing the size means rewriting that one element, then applying the same scale and offset to every shape, group, table, text inset, line weight and font size across the slides, the layouts and the masters. The layouts and masters matter more than they sound: a title placeholder on a normal slide usually carries no geometry of its own and inherits it from the layout, so a tool that rewrites only the slides leaves most of a normal deck exactly where it was.

Everything the resize does not touch is copied across without being unpacked. Photographs are already compressed inside the archive, so re-compressing them costs time to arrive back where it started — instead the compressed bytes and their checksums are carried straight through. That is why the pictures in a resized deck are identical to the originals, and why a 44 MB presentation is finished before the download prompt appears.

A 44 MB, 60-slide deck is resized in about 30 milliseconds on this device, and every photograph in it comes out byte for byte identical to the one that went in.

The tool accepts exactly what it can open, and refuses everything else at the file picker rather than after a spinner.

• .pptx — the standard PowerPoint format from 2007 onward, including files exported from Google Slides, Keynote and LibreOffice Impress.
• .pptm — macro-enabled presentations. Macros are carried across untouched.
• .potx — PowerPoint templates, which is how most people resize a template to a new house standard.
• .ppt — the pre-2007 binary format is not supported. Open it in PowerPoint or LibreOffice Impress and save it as .pptx first; the tool says so rather than failing silently.
• Password-protected files — an encrypted presentation cannot be read at all. Remove the password in PowerPoint, resize, and put it back.
• Anything else — a Word or Excel file renamed to .pptx is recognised for what it is and pointed at the tool that handles it.

Everything that decides whether the resized deck is correct is free. Pro is about scale.

• Free — one presentation at a time, up to 100 MB and 300 slides, all seventeen presets, all four scaling modes, every unit, both orientation controls and the full preview.
• Pro — a typed custom width and height, up to ten presentations in one run delivered as a single ZIP, and no imposed size or slide cap: the ceiling is what your device can handle.

• Go from 4:3 to 16:9 with Fill when the slides are mostly full-bleed pictures, and with Fit when they are mostly text — filling a text slide pushes the outer edges off the canvas.
• Use Keep positions to match a template you are about to rebuild anyway. It changes the canvas and nothing else, so nothing has to be undone.
• Check the preview on a busy slide rather than the title slide. Use the slide selector to move to one with a footer or an edge-anchored logo — those are what a Fill crops first.
• Resize before you merge when several decks are being combined, so every deck arrives at the same canvas and the merge has nothing to reconcile.
• Charts and SmartArt re-flow in PowerPoint rather than here: their frames are resized and PowerPoint lays their contents out again when it opens the file, which is what keeps them sharp.

• Compress PowerPoint
• Merge PowerPoint files
• Split a PowerPoint
• Add Watermark to PowerPoint
• Images to PowerPoint
• PowerPoint Tools