iText pdfOptimizer vs FS PDF Compressor

iText pdfOptimizer9.1Visit FS PDF Compressor8.9Visit

Higher score iText pdfOptimizer #2 in PDF Compression Software 9.1/10 Free plan · 30-day trial Free planFree trial✓ 2 of 3 features Visit iText

vs

FS PDF Compressor #4 in PDF Compression Software 8.9/10 Free plan Free plan✓ 2 of 3 features Visit GitHub

• iText pdfOptimizer fits best

  Developers embedding PDF optimization

• FS PDF Compressor fits best

  Privacy-focused users wanting free desktop compression

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature	iText pdfOptimizer 9.1/10 Visit ↗	FS PDF Compressor 8.9/10 Visit ↗
At a glance
Editor score	9.1	8.9
Ranking	#2 in PDF Compression Software	#4 in PDF Compression Software
Best for	Developers embedding PDF optimization	Privacy-focused users wanting free desktop compression
Pricing model	Free	Free
Starting price	Free	Free
Free plan	✓	✓
Free trial	30 days	—
Deployment	Self-hosted	Desktop
Integrations	5 integrations	4 integrations
Features iText pdfOptimizer 2/3 · FS PDF Compressor 2/3
Batch compression	✓	✓
Offline desktop app	Not checked yet	✓ (best)
API access	✓ (best)	Not checked yet
Specs
Compression modes	Not checked yet	Balanced
Maximum file size	Not checked yet	Not checked yet
Supported platforms	api, self_hosted	macos, windows, linux
Our review
Pros	Preset and custom profiles cover high, mid, low, and lossless compression. Optimizes images, fonts, streams, color spaces, and document structure. Supports batch processing, automation, size checks, and custom reports.	Local processing without uploads, accounts, analytics, or telemetry Batch compression for multiple PDFs and folders Native integrations across macOS, Windows, and Linux file managers
Cons	Commercial licensing uses custom or volume-based pricing. The AGPLv3 option requires disclosure of the application's full source code. Designed for Java and .NET integrations rather than general browser use.	Desktop-only workflow across macOS, Windows, and Linux Three profiles provide less granular quality control Compression depends on the bundled Ghostscript runtime
Our verdict	iText pdfOptimizer is a developer-focused add-on for the iText Core PDF library, intended for teams embedding PDF optimization into Java or .NET applications. It can optimize PDFs for file size or processing speed through configurable… Read the review →	FS PDF Compressor is a free, open-source desktop utility for reducing PDF file sizes locally. It is suited to privacy-focused users, individuals handling documents on their own computers, and teams that need batch compression without… Read the review →

Strengths and trade-offs

• iText pdfOptimizer — where it wins

  • Preset and custom profiles cover high, mid, low, and lossless compression.
  • Optimizes images, fonts, streams, color spaces, and document structure.
  • Supports batch processing, automation, size checks, and custom reports.

  Where it doesn't

  • Commercial licensing uses custom or volume-based pricing.
  • The AGPLv3 option requires disclosure of the application's full source code.
  • Designed for Java and .NET integrations rather than general browser use.

• FS PDF Compressor — where it wins

  • Local processing without uploads, accounts, analytics, or telemetry
  • Batch compression for multiple PDFs and folders
  • Native integrations across macOS, Windows, and Linux file managers

  Where it doesn't

  • Desktop-only workflow across macOS, Windows, and Linux
  • Three profiles provide less granular quality control
  • Compression depends on the bundled Ghostscript runtime

• iText pdfOptimizer9.1/10 · Free plan · 30-day trial

  A developer-focused PDF optimizer with detailed controls, automation, and flexible licensing.

  Visit iTextFull verdict →
• FS PDF Compressor8.9/10 · Free plan

  A privacy-focused, open-source desktop compressor with batch workflows and three quality profiles.

  Visit GitHubFull verdict →