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How to compress images in PowerPoint and Word

Office embeds every image at full resolution, including the parts you cropped away. One dialogue fixes both, and it is not where most people look.

The short answer

Where it is
Select an image → Picture Format tab → Compress Pictures.
Apply to all
Untick 'Apply only to this picture' to process the whole file.
Cropped areas
Tick 'Delete cropped areas of pictures' — often the biggest single saving.
For screen viewing
The Web preset, around 150 ppi.
For printing
Print, around 220 ppi.
Irreversible
Save a copy first. Cropped data cannot be recovered afterwards.

Compressing a document

  1. Step 1: Save a copy first

    Compression in Office is destructive and applies on save. Deleted cropped areas and discarded resolution cannot be recovered, so work on a duplicate if the original matters.

  2. Step 2: Open Compress Pictures

    Click any image in the document, go to the Picture Format tab on the ribbon, and choose Compress Pictures. It is an easy button to miss, and it is the only place these options live.

  3. Step 3: Untick 'Apply only to this picture'

    Left ticked, you compress one image and wonder why the file barely changed. Unticking it applies your choice to every image in the document at once.

  4. Step 4: Tick 'Delete cropped areas' and choose a resolution

    Cropping in Office only hides the rest of the image — it is still in the file. Deleting cropped areas is frequently the largest single saving. Then pick a resolution: Web for screen viewing, Print if it will go on paper.

Details worth knowing

Cropping does not remove anything

When you crop an image in PowerPoint or Word, Office stores the full original and simply displays a window onto it. That is genuinely useful while you are working — you can re-crop later without losing anything — and it is why a deck full of tightly cropped photographs can be enormous.

A photograph cropped to a tenth of its area is still occupying its full original size in the file. Ticking "Delete cropped areas of pictures" discards the hidden parts and often shrinks a deck more than any resolution change.

It is also irreversible, which is why the first step is to save a copy.

What the resolution presets mean

High fidelity
Keeps the original resolution. No saving at all.
HD (330 ppi)
For material that will be printed at high quality.
Print (220 ppi)
Good for anything going on paper. A sensible default for documents.
Web (150 ppi)
The right choice for a deck that will be presented or emailed. Typically a very large saving.
Email (96 ppi)
Smallest, and visibly soft if the deck is later shown on a projector.

The values are relative to the size the image is placed at on the page, not to its original dimensions — which is why placing a huge image and shrinking it on the slide wastes so much.

Turn off automatic compression for source files

Office also has a document-level setting under File → Options → Advanced → Image Size and Quality, including "Do not compress images in file" and a default resolution.

These are worth knowing about in both directions. Turning compression off preserves quality in a master document you will edit for months. Setting a low default resolution means every image you paste from then on is compressed automatically, which is convenient for a deck you know is only ever going on screen.

The habit that avoids all of this

Compress and resize images before you place them. An image that arrives in the document at 1600 pixels and 200 KB never needs fixing afterwards, never doubles the file through hidden cropped areas, and never forces a destructive pass over the finished deck.

The bulk compressor on this site handles a folder of images in one go, which is usually quicker than repairing a document later.

One caveat

Menu names and options move between releases. If a step below does not match what you see, the underlying capability is usually still there under a nearby name — and the browser tool on this page works identically on every version.

Do it here instead

These run in your browser on any device, so nothing is uploaded and there is nothing to install.

  • Bulk compressor

    One setting across a whole folder, processed in parallel, downloaded as a ZIP.

    Open the tool

  • Compress JPEG

    Shrink JPG and JPEG photographs with a quality slider or an exact target size.

    Open the tool

  • Resize image

    By pixels or percentage, aspect ratio locked, across a whole batch.

    Open the tool

  • Compress to 200KB

    Full resolution kept, quality still invisible to the eye.

    Open the tool

Questions

Frequently asked questions

Every answer below is present in the page source, expanded, so it can be read without opening anything.

Why is my PowerPoint file so large?

Almost always images, and very often the hidden parts of cropped ones. Office keeps the full original behind every crop, so a deck of tightly cropped photographs can be several times larger than it appears. Compress Pictures with 'Delete cropped areas' ticked usually fixes it in one pass.

Where is the Compress Pictures option?

Select any image, then look for the Picture Format tab on the ribbon — Compress Pictures sits in the Adjust group. It only appears while an image is selected, which is why it is so often missed.

Does compressing pictures reduce quality?

Yes, and permanently within that file. The resolution is genuinely reduced and deleted cropped areas are genuinely gone. Keep a copy of the original document if you may need the full-quality images later.

Which resolution should I pick?

Web (150 ppi) for a deck that will be presented on screen or emailed. Print (220 ppi) if it is going on paper. Email (96 ppi) only when the file must be very small and will never be projected.

Why did compressing barely change the file size?

You probably left 'Apply only to this picture' ticked, which compresses one image and nothing else. Untick it to apply the setting across the whole document.

Is it better to compress before inserting?

Considerably. An image that arrives already sized and compressed never bloats the file, never hides cropped data, and does not require a destructive pass over the finished document later.

From the blog

Related reading

More background from the blog.

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    How to Reduce Image Size for Email Without Sending a Blurry Mess

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    How to Compress Images for a Website Without Wrecking Them

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  • Image Compression

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    Quality 80 is not 80% of anything. It is an index into a quantisation table. Measured on one photograph: dropping from 100 to 90 removes 77% of the file and 4.2 dB of fidelity; dropping from 40 to 30 removes 17% and costs almost as much.

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