Compress an image to 800 KB
Pictures for slides and long documents that need to stay light.
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How it works
Add your images
Drag and drop, paste, or pick files. They upload over an encrypted connection.
Pick a quality or a target size
Use the quality slider, or tell it exactly how many KB or MB you need.
Download
Save each file, or grab them all at once as a ZIP.
A presentation with thirty slides and a photo on each can swell to a hundred megabytes if the originals go in untouched. Compressing each picture to 800 KB keeps the deck near twenty-four megabytes and still sharp on a projector.
The tool finds the best quality that fits under 800,000 bytes, and shrinks the pixel size only when it must. A typical result is about 2500 pixels wide, well above what a projector or a screen share can show.
Presentations are shown at screen resolution, which is far lower than a camera records. A picture wider than 2000 pixels adds weight that nobody in the room can see, so trimming it costs nothing.
Why decks grow so large
Slide software stores each pasted photo at its full size, even when the slide shows it at a tenth of the area. Ten phone photos can add forty megabytes. Compressing before you paste is the cheapest way to shrink a deck, and it makes the file easier to email or open on a weak laptop.
Matching the picture to the slide
A full-bleed picture on a widescreen slide needs about 1920 pixels across for a projector and 2560 for a modern monitor. Anything beyond that is wasted. Set the width in Resize to the larger figure, compress to 800 KB, and the picture will look crisp everywhere.
Reports and long documents
Word processors behave like slide software, so a report with many photographs grows fast. Compress each picture before inserting it. A forty-page report with twenty pictures at 800 KB is sixteen megabytes of images, a size most systems handle without trouble.
Charts and diagrams
Charts and diagrams are flat colour and lines, so they compress far better as PNG or WebP than as JPEG, and they rarely need 800 KB. If a chart lands well under the target, enlarge its width for a sharper projection.
Sharing the deck
A lighter deck opens faster for the audience and survives a poor conference wifi. Test the file on another computer before the day, so you know it opens as expected.
A final check of the deck
After you have replaced the pictures, open the file, run through every slide, and note the file size. If it is still larger than you wish, look for other heavy items, such as embedded video or large fonts, since pictures may not be the whole story.
Save a second copy as a PDF if you need a version that cannot be edited, and compare the size to your target.
Pictures for print and pictures for screen
If the presentation will also be printed, consider a higher target for the key pictures. A screen shows less detail than paper, so a picture that is excellent on the wall can look soft on a page.
For most talks, though, the 800 KB target on this page is enough.
Frequently asked questions
What resolution should slide pictures have?
1920 pixels across is enough for a projector. 2560 suits a modern monitor.
Will compressing change the slide layout?
No. The picture's shape stays the same, so it fits the slide as before.
Can I compress pictures already inside a deck?
Export the pictures from the deck, compress them here, and put them back.
Should I use PNG or JPEG for slides?
JPEG for photographs, PNG or WebP for charts and screenshots.
Does the result lose colour accuracy?
Colours are kept. Projectors vary far more than compression does.
Is 800 KB too much for a mobile slideshow?
For a mobile audience on data, lower the target to 300 KB per picture.