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Bulk Compress PowerPoint Files Online

Reduce PPTX file sizes by compressing embedded images.

Drop up to 50 presentations at once — no install, no sign-up required.

Sign up free → get 500 Pro Credits that never expire

Drop PowerPoint Files to Compress

50 MB per file Up to 50 files 3 parallel 1 credit per 5 MB

Encrypted EU Servers Auto-delete 1h

⚡ Median time per slide (last 10k jobs): 206ms
Resize Embedded Images: Off

How it works

Drop your files

Drag & drop or choose PowerPoint files. No account required.

We optimize carefully

→ Smaller files, no visible quality loss
→ Encrypted in transit & at rest
→ EU servers, auto-deleted in 1 hour

Download optimized PPTX

→ Individually or as a single ZIP
→ Auto-deleted after 1 hour

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About PowerPoint Compression

PowerPoint presentations often become bloated with high-resolution photos across dozens of slides. Our compressor optimizes these embedded images without affecting slide layouts, animations, or text.

How PowerPoint Compression Works

  • Image Extraction: We unpack the PPTX and compress all embedded images.
  • Image Compression: Photos are compressed with JPEG compression. Transparent graphics stay as PNG.
  • Preservation: Animations, transitions, speaker notes, and all formatting remain intact.
  • Full Compatibility: Output works in Microsoft PowerPoint, Google Slides, Keynote, and other presentation software.

Best For

Photo-heavy presentations, training decks, sales pitches with product images, and any presentation that exceeds email attachment limits.

Frequently Asked Questions

How do I reduce PowerPoint file size for email?

Drop your .pptx file here and we'll compress embedded images instantly. Presentations with photos typically see 50-80% reduction. A 50 MB presentation with full-screen photos often compresses to 10-15 MB—well under most email limits.

Are my PowerPoint files private and secure?

Yes. Your presentations are encrypted in transit (TLS 1.3) and at rest (AES-256), processed exclusively on EU servers, and automatically deleted after 1 hour. We never view, share, or store your files beyond the processing window.

Why are PowerPoint files so large?

PowerPoint stores images at their original resolution, even if you resize them on the slide. A 12-megapixel phone photo remains 12 megapixels inside the file. Multiply by 20+ slides and you easily hit 100+ MB. Our compressor optimizes images for screen display while maintaining visual quality.

Will compression affect my animations and transitions?

No. We only modify embedded image data. All animations, transitions, timing, speaker notes, audio, video, and slide layouts are preserved exactly. Your presentation will play identically after compression.

Can I compress .ppt files (legacy PowerPoint)?

We only support the modern .pptx format (PowerPoint 2007 and later). To compress older .ppt files, open them in PowerPoint or Google Slides and save as .pptx first. This also gives you access to newer PowerPoint features.

How much can I reduce a PowerPoint file's size?

Photo-heavy presentations: 50-80% reduction. Presentations with screenshots: 40-60% reduction. Mostly text/charts: 10-30% reduction. The more photos your presentation contains, the more dramatic the compression.

Does compression work with embedded videos?

We currently focus on image compression only. Embedded videos are passed through unchanged. For video-heavy presentations, consider using video compression tools separately. Images are usually the primary contributor to file size anyway.

Will my slide masters and templates be preserved?

Yes. Slide masters, custom layouts, themes, color schemes, and fonts are all preserved. We only touch the binary image data embedded within these elements—the structure and formatting remain identical.

What are the file size and batch limits?

TierMax File SizeMax Files/BatchParallel Jobs
Guest/Free50 MB50 files3 at once
Pro1 GB1000 files6 at once

Note: Batch and parallel processing limits apply site-wide across all compressors.

How are credits calculated for compression?

Cost: 1 credit per 5 MB

How it works:

  • Files up to 5 MB: 1 credit
  • 6-10 MB: 2 credits
  • 11-15 MB: 3 credits
  • 16-20 MB: 4 credits

Example: A 5 MB file = 1 credit. A 95 MB file = 19 credits.

Why per-megabyte? Larger files require more processing resources (memory, CPU, bandwidth, storage).

What are my daily and monthly credit limits?

Credit allocations vary by account tier:

TierCreditsReset
Guest50/dayMidnight UTC
Free50/dayMidnight UTC
Pro12,000/monthBilling cycle

Note: Credits are based on file size (1 credit per 5 MB). Guest/Free users have 50 credits per day. Pro users have 12,000 credits per month.

Answers at a Glance

Quick answers to common questions.

Need to get more done? Pro starts from $5.

1 GB files 1,000 per batch Priority queue Web + API
See Pricing →

No subscription required.

What's New in PowerPoint Compressor

Latest improvements to this compressor

Last updated February 27, 2026
Feb 27, 2026

Now available via the Compress.FAST REST API for programmatic compression.

Dec 26, 2025

Initial release with slide image compression.