How to Reduce File Size in Microsoft Word (2026)

How to Reduce File Size in Microsoft Word (2026)

Large Word files are difficult to email and slow to open. Images are the main culprit. By compressing images and removing unnecessary formatting, you can reduce file size significantly while maintaining quality.

手順

Step 1: Identify Large Content

Look for images and embedded files that increase file size. Click File > Properties to see current size.

Step 2: Compress Images

Click an image. Click Picture Format > Compress Pictures. Select resolution for your use case (screen, email, print).

Step 3: Compress All Images

In the Compress Pictures dialog, check ‘Apply only to this picture’ to compress individual images, or uncheck to compress all.

Step 4: Delete Unused Styles

Click File > Options > Advanced > Show background colors and images. Remove unused custom styles.

Step 5: Remove Tracked Changes

If Track Changes is on, accept all changes. Tracked versions increase file size significantly.

Step 6: Delete Version History

File > Info > delete all previous versions to remove version history.

Step 7: Save Optimized

Click File > Save As > More Options > Tools > Compress. Or simply save the file to reduce size.

よくある間違い

• Over-compressing images until they look pixelated—find the balance between quality and size
• Not realizing that each version/revision history increases file size—clean history regularly
• Converting to PDF when Word compression would suffice—PDF may have different compression

ヒントとコツ

• Compress images as you insert them, before they’re embedded—external images are smaller
• Target resolution matters: 150 dpi for print, 96 dpi for screen/email
• Regularly save with cleanup to prevent accumulated bloat in long documents