Free · in your browser · nothing uploaded
Compress a PowerPoint — make a .pptx smaller, free
Compress a PowerPoint file by shrinking the photos and screenshots on its slides — they are usually what makes a .pptx too big to email. Text, layouts, animations and notes are left exactly as they are.
Word · PowerPoint → smaller file
Choose a PowerPoint file
- Only the pictures inside are made smaller. Text, layout and tables stay as they are.
- Your file never leaves this device: nothing is uploaded.
- Old .doc and .ppt files and files that need a password to open can’t be opened here.
This runs on your device, so a large file with many pictures can take a minute. Keep this tab open.
Videos, sound, fonts, drawings and embedded objects are copied as they are.
Keep your original: pictures can’t be brought back to full resolution later.
Choose the file and it is compressed at once at print quality (220 ppi). Need it under 10 MB for email, or under 5 MB for an upload form? Pick that size: the pictures are saved smaller until it fits, and if it can’t, you see the smallest size reached.
How do I reduce the size of a PowerPoint file?
Make the pictures on the slides smaller. Choose your .pptx above: LensUp saves the photos and screenshots again for 220 ppi — the print setting PowerPoint offers in its own Compress Pictures — and you download the smaller presentation. To fit a limit, press Under 1 MB, 2 MB, 5 MB or 10 MB. Videos are not changed, and the file never leaves your device.
How to compress a PowerPoint presentation
- Choose your presentationPick a .pptx of up to 50 MB (200 MB with LensUp Pro), or drop it on the page. It is read on your device; nothing is uploaded.
- Wait a momentThe pictures are saved again for the size they are shown at on their slides, targeting 220 ppi. A deck with dozens of photos can take a minute.
- Download, or pick a sizeDownload the smaller .pptx. To fit a limit, press Under 1 MB, 2 MB, 5 MB or 10 MB, or type a size in KB.
Why presentations get so big
PowerPoint keeps every photo at the resolution it was taken at, even when it fills only a corner of a slide, and stock photos and screenshots add up fast. Videos are the other big part: a single clip can be larger than all the slides together.
What changes, and what stays
Only the pictures are saved again. Each one is resized for the size it appears on its slide, targeting 220 ppi, and photos are stored as JPEG; pictures with transparent parts and screenshots stay PNG, and a picture that would not get smaller stays as it is. Slides, text, layouts, themes, animations, transitions and speaker notes are copied as they are.
What it can’t do
It makes pictures smaller. Parts of the presentation that are not pictures stay the size they are.
- Videos and sounds are not compressed. In PowerPoint for Windows, File › Info › Compress Media shrinks them.
- Old .ppt files and files with an open password can’t be opened. Save as .pptx in PowerPoint, or remove the password, first.
- Embedded fonts, EMF and WMF drawings, GIF pictures and embedded Excel charts are copied as they are.
- A picture that was made smaller can’t get its full resolution back later. Keep your original.
- A digitally signed presentation loses its signature in the smaller copy. You are asked before that happens.
Questions
How do I make a PowerPoint smaller for email?
Choose the .pptx above and press Under 10 MB (or Under 5 MB for stricter mail servers). The pictures are saved smaller until the file fits; you download it and attach it. If videos alone are larger than the limit, LensUp shows the smallest size it reached and how much of it is video.
Does it compress videos in my presentation?
No. Videos and sounds are copied as they are. To shrink them, use File › Info › Compress Media in PowerPoint for Windows, then compress the pictures here.
Does compressing reduce the quality of my slides?
Text, layouts and animations are untouched. Pictures do lose some detail: by default they are saved for 220 ppi, the print setting PowerPoint itself offers, which is usually hard to tell apart on a projector, a screen or paper — check large photos before you print. Under a set size they can go lower; small text inside screenshots may then look softer when you zoom in.
Can I compress a .pptx file?
Yes, .pptx is what this tool takes (and .docx for Word). Old .ppt files need to be saved as .pptx in PowerPoint first.
Is my presentation uploaded?
No. Your browser reads the file and makes the smaller copy on your device. Nothing is sent to a server.
Can I compress the pictures in PowerPoint itself?
Yes: select a picture, open Picture Format › Compress Pictures, untick “Apply only to this picture” and choose a resolution. LensUp does the same to every picture at once, in a current browser, without PowerPoint, and can aim for a set file size.