PDF24 vs ShrinkTo: Online vs Browser-Only PDF Tools (2026)

1. Quick verdict
2. Side-by-side
3. Privacy comparison
4. When PDF24 Desktop wins
5. When ShrinkTo wins
6. When NOT to use PDF24 Online
7. Feature breakdown
8. Real tasks
9. Recommendation
10. FAQ

Quick verdict (TL;DR)

PDF24 is a German freeware company that's genuinely user-friendly and offers two main products: an online tool (PDF24 Tools, which uploads files) and a free Windows desktop app (PDF24 Creator, which processes locally). The desktop app is excellent and should be more popular than it is.

ShrinkTo is browser-based — splits the difference between cloud-based tools and desktop apps. No install required, but processing happens locally in your browser.

For Windows users wanting offline desktop tools: PDF24 Creator wins. For everyone else (Mac, Linux, mobile, anyone who doesn't want an install): ShrinkTo.

Side-by-side comparison

Privacy comparison

PDF24 has two products with very different privacy stories:

• PDF24 Tools (web): Uploads your file to their German servers. Privacy policy is reasonable; files deleted after processing. Same risk profile as iLovePDF or Smallpdf.
• PDF24 Creator (Windows desktop): Processes locally. No upload. As private as ShrinkTo's browser-based approach.

Most users assume PDF24 is local because of the desktop app, but the web version uploads. If you visit pdf24.org and use the online tools, you're uploading. If you download and install PDF24 Creator, you're not.

When PDF24 Desktop is the better pick

• You're on Windows and want a permanent desktop tool
• You frequently process huge files (200+ MB) — browser memory limits don't apply
• You want to integrate PDF tools into your right-click context menu
• You print to a virtual PDF printer for capture from any app
• You need batch processing of 100+ files at once
• You work offline frequently

When ShrinkTo is the better pick

• You're on Mac, Linux, mobile, or any non-Windows platform
• You don't want to install anything — browser is enough
• You need exact KB-target image compression (PDF24 doesn't offer this)
• You're on a shared/work computer where you can't install software
• You need quick one-off processing without learning a new desktop UI
• You're using a phone — PDF24 Creator is desktop-only, no mobile version

When NOT to use PDF24 Online

PDF24's web version uploads your files. For sensitive documents:

• Government IDs (Aadhaar, PAN, passport)
• Financial documents
• Medical records
• Confidential business material

Use either ShrinkTo (browser-only) or PDF24 Creator desktop instead. Both keep files local.

Feature comparison: where each excels

PDF24 has:

• Virtual PDF printer (Print → PDF24 from any application)
• Built-in OCR (decent quality, runs locally on desktop)
• PDF/A export
• Right-click Windows integration
• Form field detection and editing
• Email-from-app (open client with PDF attached)

ShrinkTo has:

• Cross-platform (works identically on Mac, Linux, Windows, mobile)
• Exact KB-target image compression (governments exam forms)
• HEIC/AVIF support (PDF24 doesn't handle these well)
• Built-in image compressors with portal presets (UPSC, SBI, etc.)
• Zero install, zero account, zero permissions to grant
• Works on a Chromebook, work computer, friend's laptop

Three real tasks compared

Task 1: Convert any document to PDF on Windows

PDF24 Creator wins — its virtual printer lets you "Print → PDF24" from Word, Excel, browsers, anything. ShrinkTo doesn't have a virtual printer (it's browser-only).

Task 2: Compress a photo to exactly 50 KB for an SBI exam form

ShrinkTo wins. Its /compress-to-50kb tool uses binary-search to hit the exact target. PDF24 doesn't offer KB targeting.

Task 3: Quick PDF merge on a Mac without installing anything

ShrinkTo wins. PDF24 Creator is Windows-only. ShrinkTo's /tools/merge-pdf works in any browser, including Safari on Mac.

My recommendation

Windows power user: Install PDF24 Creator. It's free, comprehensive, and processes locally.

Mac/Linux user: Use ShrinkTo. PDF24 doesn't have a desktop app for you, and the web version uploads.

Mobile user: ShrinkTo works in mobile browsers. PDF24 is desktop-focused.

Heavy user across multiple machines: ShrinkTo for consistency (same browser tool on every device) or pay for a cross-platform paid tool.

Frequently asked questions