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Bulk Compress Documents Online

Reduce PDF, Word, and PowerPoint file sizes while maintaining quality.

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

Sign up free → get 500 Pro Credits that never expire

Drop Documents to Compress

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

Encrypted EU Servers Auto-delete 1h

⚡ Median compression time (last 10k jobs): 404ms
Resize Embedded Images: Off

How it works

Drop your files

Drop up to 50 documents. No account required.

Supports 3 formats:

PDF DOCX PPTX

We optimize carefully

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

Get optimized documents

Download individually or as a single ZIP.

→ PDF, DOCX, PPTX stay same format
→ Embedded images optimized
→ Text & formatting preserved

About Document Compression

Documents often contain embedded images that significantly increase file size. Our compressor optimizes these images without affecting text, formulas, or document structure.

How Document Compression Works

  • PDF: Embedded images are recompressed, fonts are subsetted, and internal structures are optimized.
  • Office (DOCX, PPTX): We extract and optimize embedded images while preserving text and formatting.
  • Quality Preservation: Text remains sharp and searchable. Formatting stays intact.
  • Format Integrity: Output documents open normally in their respective applications.

Best For

Reports with photos, presentations with images, scanned PDFs, and any document that needs to be shared via email or uploaded to portals with size limits.

Document Compression Guides

How to Reduce File Size Without Losing Quality (2026 Guide)

Shrink images, PDFs, and documents by up to 80% without visible quality loss. Step-by-step methods from quick browser tools to advanced batch optimization.

12 min read • February 07, 2026

How to Compress an Excel File: A Practical Guide

Learn how to compress Excel files with actionable methods that work. Our guide covers image optimization, XLSB conversion, and data cleanup for smaller spreadsheets.

9 min read • February 04, 2026

10 Document Management Best Practices for Developers and Small Teams

Discover 10 actionable document management best practices for efficiency and security. Learn naming, compression, encryption, and retention strategies.

10 min read • January 25, 2026

Best Free File Compression Tools Online (2026) — No Signup Required

Compare 12 free browser-based compression tools for images, PDFs, and documents. No downloads or accounts needed. Ranked by speed, privacy, and output quality.

12 min read • January 22, 2026

How to Make a PowerPoint File Smaller

Discover how to make powerpoint file smaller with practical steps to compress images, videos, and fonts without sacrificing quality.

8 min read • January 19, 2026

Bulk Minify PDF Files — Web Tools & CLI Scripts (2026)

Batch compress hundreds of PDFs at once. Free browser tool for quick jobs, Ghostscript and Python scripts for automation. Reduce PDF sizes by 60-90% without quality loss.

10 min read • January 15, 2026

Frequently Asked Questions

Is document compression safe?

Yes. Your documents are encrypted in transit (TLS 1.3) and at rest (AES-256). Files are processed on EU servers and automatically deleted after 1 hour. We don't view, share, or store your documents beyond the processing window.

Will compression affect my document's formatting?

No. We only touch embedded images. All text, fonts, styles, tables, charts, formulas, macros, and document properties remain exactly as they were. Compressed documents open identically in their native applications.

What document formats can I compress?

We support PDF, Word (.docx), and PowerPoint (.pptx). Drop any of these formats and we'll automatically detect and optimize them. Legacy formats (.doc, .ppt) need to be converted to modern formats first.

How does document compression work?

Documents contain embedded images (photos, screenshots, graphics) that are often stored at high resolution. We extract these images, compress them using optimized algorithms, then repackage the document. Text, formulas, and formatting are never modified.

How much can I reduce document file sizes?

Results depend on image content:
  • Scanned PDFs: 50-80% reduction
  • Presentations with photos: 50-80% reduction
  • Documents with screenshots: 40-60% reduction
  • Text-only documents: Minimal reduction

Why are my documents so large?

Common causes:
  • High-resolution embedded photos
  • Full-page scans in PDFs
  • Screenshots at native resolution
  • Multiple images across pages/slides
Our compressor addresses all of these.

Can I compress password-protected documents?

Documents with open passwords (requiring a password to view) cannot be compressed. Documents with editing restrictions can usually be compressed since we only modify image content.

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
Guest100/dayMidnight UTC
Free100/dayMidnight UTC
Pro12,000/monthBilling cycle

Note: Credits are based on file size (1 credit per 5 MB). Guest/Free users have 100 credits per day. Pro users have 12,000 credits per month.

Answers at a Glance

Quick answers to common questions.

No subscription required

Pricing that fits how you work

$5 covers 12.5 GB of compressions.

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

Secure checkout via Stripe

What's New in Document Compressor

Latest improvements across all document tools

Last updated February 27, 2026
Feb 27, 2026

All document compressors now available via the Compress.FAST REST API.

Dec 26, 2025

Initial release with PDF, Word, and PowerPoint compression.