Compress.FAST
Convert.FAST

Transform files between formats
Compress.FAST Current

Shrink files without losing quality
Tools.FAST

Your complete file toolkit

PDF.FAST Coming soon

Professional PDF tools

50

Bulk Compress PDF Files Online

Reduce PDF file sizes while maintaining document quality and readability.

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

Drop PDF Files to Compress

25 MB per file Up to 50 files 3 parallel 1 credit each

Encrypted EU Servers Auto-delete 1h

⚡ Median time per page (last 10k jobs): 42ms

How it works

Drop your files

Drag & drop or choose PDF 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 PDFs

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

About PDF Compression

PDF (Portable Document Format) is the standard for sharing documents. Our compressor reduces PDF file sizes while maintaining text clarity and image quality.

How PDF Compression Works

  • Image Optimization: Embedded images are recompressed using efficient algorithms.
  • Stream Compression: PDF data streams are optimized to reduce overall file size.
  • Object Stream Compression: PDF internal structures are optimized for smaller size.
  • Linearization: PDF structure is optimized for faster web viewing and smaller size.

Best For

Documents with embedded images, scanned PDFs, reports, presentations exported to PDF, and any PDF destined for email or web sharing.

Frequently Asked Questions

How do I reduce PDF file size for email?

Drop your PDF here and we'll compress it instantly. Most email providers limit attachments to 25 MB. Our compressor typically achieves 40-70% reduction on PDFs with embedded images. For text-heavy PDFs, expect 20-40% reduction. The compressed file downloads immediately—no email required.

Are my PDF files private and secure?

Yes. Your PDFs 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 documents beyond the processing window.

Does PDF compression reduce quality?

Our compressor balances file size with quality. Text remains sharp and searchable. Embedded images are recompressed using efficient algorithms that preserve visual quality while reducing size. For most documents, the difference is imperceptible. Scanned PDFs with large images see the best compression.

Why is my PDF file so large?

Common causes: 1) High-resolution embedded images (photos, scans), 2) Embedded fonts (especially with many font families), 3) Unoptimized export from design software, 4) Multiple pages with graphics. Scanned documents are often the largest—each page is essentially a full-page image.

Can I compress a scanned PDF?

Yes, scanned PDFs compress very well! Scanned documents are essentially images, so our image optimization provides significant savings. Expect 50-80% reduction on typical scanned documents. Text recognition (OCR) is preserved if your PDF already has a text layer.

How much can I reduce a PDF file size?

Results vary by content: Scanned documents: 50-80% reduction. PDFs with photos: 40-70% reduction. Presentation exports: 30-60% reduction. Text-heavy documents: 20-40% reduction. Already-optimized PDFs may see smaller gains (10-20%).

Will compression remove editable text from my PDF?

No. Text layers, form fields, and searchable content are preserved. We compress embedded images and optimize internal structures, but text remains fully selectable and searchable. Hyperlinks, bookmarks, and document structure are also maintained.

Can I compress password-protected PDFs?

PDFs with open passwords (requiring a password to view) cannot be compressed without first removing the protection. PDFs with permission passwords (restricting editing/printing but allowing viewing) can usually be compressed. If your PDF requires a password to open, decrypt it first.

What are the file size and batch limits?

TierMax File SizeMax Files/BatchParallel Jobs
Guest/Free25 MB50 files3 at once
Pro200 MB200 files6 at once
Business1 GB1000 files10 at once

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

How are credits calculated for compression?

Cost: 1 credit each

How it works:

  • Files up to 25 MB: 1 credit (minimum)
  • 26-50 MB: 2 credits
  • 51-75 MB: 3 credits
  • 76-100 MB: 4 credits
  • Over 1000 MB: 40 credits (maximum cap)

Example: A 5 MB file = 1 credit. A 95 MB file = 4 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
Pro10,000/monthBilling cycle
Business30,000/monthBilling cycle

Note: With 1 credit per file, Guest/Free users can compress 50 files per day. Pro users can compress 10,000 files per month.

Answers at a Glance

Quick answers to common questions.

Choose Your Plan

One subscription unlocks the entire Tools.FAST Network. Plans cover Compress.FAST, Convert.FAST, PDF.FAST (soon), and all future tools.

Monthly Annual 4 Months Free

Free

$0

For occasional personal use

  • 25 MB per file
  • 50 files per batch
  • 3 parallel jobs
  • 50 credits/day
  • Standard priority
  • Email support
Sign Up Free

No sign-up required. Create an account for your own credit pool.

Popular

Pro

$9 /month

For independent work

  • 200 MB per file
  • 200 files per batch
  • 6 parallel jobs
  • 10,000 credits/month across Tools.FAST
  • High priority
  • Email & chat support
  • One subscription for the entire Tools.FAST network

Business

$19 /month

1 seat

For production scale

  • 1 GB per file
  • 1000 files per batch
  • 10 parallel jobs
  • 30,000 credits/month across Tools.FAST
  • Add seats to invite team members
  • Highest priority
  • Priority email & chat support
  • One subscription for the entire Tools.FAST network

How Credits Work

  • Usually 1 credit per file. Exact cost shown before you start.
  • Credits refresh monthly on your billing cycle.
  • Unused credits roll over, capped at your plan's monthly amount.
  • One subscription, all sites. Works across Compress.FAST, Convert.FAST, and future tools.
View all Compress.FAST limits by tier → View all Convert.FAST limits by tier →

What's New in PDF Compressor

Latest improvements to this compressor

Last updated December 26, 2025
Dec 26, 2025

Initial release with image optimization and font subsetting.