Question 1

What features does the online PDF toolkit provide? Does it support PDF merge, split, and compress?

Accepted Answer

We offer a complete online PDF solution including:  1. PDF Merge - Combine multiple PDF files into one 2. PDF Split - Split large PDFs into smaller files 3. PDF Compress - Reduce file size while maintaining clarity 4. PDF Convert - Convert between PDF and JPG, PNG, Word, etc. 5. PDF Page Management - Delete, extract, rearrange pages 6. PDF Encrypt/Decrypt - Protect or remove PDF passwords  All tools work offline, completely free, no registration required.

Question 2

Are PDF online tools completely free? Are there usage limits?

Accepted Answer

Yes, 100% completely free! Our promises:  • No usage limits - Use as many times as you want • No file quantity limits - Batch processing is completely free • No watermarks - Processed PDFs have no watermarks • No registration required - Open and use, no account needed • Forever free - All basic features remain free forever  Supported by the open-source community, making PDF tools truly accessible to all users.

Question 3

Do I need to install software to use online PDF tools? Does it work on mobile?

Accepted Answer

No software installation required!  Supported devices: • Desktop: Windows, macOS, Linux • Mobile: iOS (iPhone/iPad), Android • Tablets: All tablet devices  Just need a modern browser (Chrome, Edge, Firefox, Safari). The mobile experience is identical to desktop - process PDF files anytime, anywhere.

Question 4

How to merge multiple PDF files online? Do I need to register?

Accepted Answer

Merging PDFs is simple, no registration needed:  Steps: 1. Click "PDF Merge" tool 2. Drag or click to upload multiple PDF files 3. Adjust file order (optional) 4. Click "Merge" button 5. Download merged PDF file  Supports merging 10+ PDF files at once. Files merge in your specified order. The entire process happens locally in your browser, no server upload needed.

Question 5

Are online PDF tools safe? Will my files be uploaded to servers?

Accepted Answer

Absolutely safe! This is our core promise.  Three layers of security:  1. 100% Local Processing    • All PDF processing happens in your browser    • File data never leaves your device    • Works even when offline  2. Zero Server Storage    • Our servers cannot see your files    • No file uploads, no cloud storage    • Browser automatically clears cache after processing  3. Open Source Transparency    • Code fully open-sourced on GitHub    • Audited by global developers    • Supports local deployment  Unlike other services requiring file uploads, we use WebAssembly technology for browser-side processing, ensuring your business files and personal privacy are absolutely secure.

Question 6

Will PDF online tools save or view my file contents?

Accepted Answer

We can neither see nor store them!  Technical principle: • All processing based on local WebAssembly computation • Files exist only in your device memory • Automatically cleared from memory after processing • Our servers cannot access any file content  This means: ✓ Your contracts - Absolutely confidential ✓ Your financial statements - Completely secure ✓ Your personal documents - Will not leak ✓ Your business secrets - Only you can see  Even our development team has zero access to any files you process.

Question 7

What advantages do you have over iLovePDF, Smallpdf, etc.?

Accepted Answer

The key difference lies in "local processing" rather than "cloud uploading".  GuardPDF runs entirely within your browser — no file uploads, no external servers — ensuring complete privacy and security.  Key advantages: 1. 🔐 Privacy & Security: All operations happen locally on your device. 2. ⚡ Faster Performance: No upload or download delays. 3. 📁 Large File Support: Handle PDF files up to hundreds of MB (depending on your device). 4. 🌐 Works Offline: Fully functional even without internet access. 5. 💡 Free Forever: All core features are permanently free with no registration or subscriptions.  Compared with cloud-based tools, local processing offers superior privacy, speed, and full data control.

Question 8

Which browsers do online PDF tools support? Can I use Chrome, Edge, Firefox?

Accepted Answer

All major modern browsers supported:  ✓ Fully supported: • Google Chrome 90+ • Microsoft Edge 90+ • Mozilla Firefox 88+ • Apple Safari 14+ • Opera 76+  ✓ Mobile browsers: • iOS Safari (iPhone/iPad) • Chrome for Android • Samsung Internet • UC Browser  Recommendation: For best performance, use the latest browser version. If you encounter issues, try updating your browser.

Question 9

What file sizes do PDF online tools support? Can it handle 100MB PDFs?

Accepted Answer

File size mainly depends on your device performance:  Recommended limits: • Desktop: Max 200-500MB (depends on memory) • Mobile: Max 50-100MB (avoid lag) • Tablet: Max 100-200MB  Actual performance: • Under 10MB: Instant, smooth on any device • 10-50MB: 1-5 seconds, normal on most devices • 50-100MB: 5-15 seconds, needs good device • Over 100MB: Needs high-performance device, may be slow  Advantage: Compared to upload services (usually 20-50MB limit), our local processing handles larger files as long as your device has enough memory.

Question 10

Will PDF quality decrease after compression? How to ensure file clarity?

Accepted Answer

We offer flexible compression options for you to choose:  Compression levels:  1. Light Compression (Recommended)    • File reduction: 30-50%    • Quality retention: 95%+    • Best for: Documents needing high quality  2. Medium Compression    • File reduction: 50-70%    • Quality retention: 85-90%    • Best for: Daily office documents  3. Heavy Compression    • File reduction: 70-85%    • Quality retention: 70-80%    • Best for: View-only documents  Other operations (merge, split, convert): • Completely lossless processing • Maintains all original file quality • No clarity reduction or layout changes  You can preview before downloading. Unsatisfied? Readjust compression level.

Question 11

What resolution for PDF to JPG conversion? Does it support HD conversion?

Accepted Answer

We support multiple resolution options:  Available resolutions: • Standard: 150 DPI - Suitable for web display • HD: 300 DPI - Suitable for printing and professional use • Ultra HD: 600 DPI - Suitable for design and publishing  Output formats: • JPG - Suitable for photos and color documents • PNG - Supports transparent background, suitable for icons and design • WebP - Smaller file size, same quality  Each PDF page converts to a separate image. You can convert all pages or specific pages.

Question 12

Will PDF tools always be free? Will there be charges in the future?

Accepted Answer

We adopt a tiered transparent strategy:  Forever free features (Promise): • PDF merge, split • PDF compress • PDF convert (PDF↔images, Word, Excel) • PDF page management (delete, extract, rearrange) • PDF encrypt/decrypt • All features 100% local processing, no internet needed  These core features will never charge!  Possible future value-added services (requires user authorization): • AI intelligent summary (requires cloud processing) • AI content translation (requires cloud processing) • OCR text recognition (requires cloud processing)  Promise: 1. AI features will clearly inform before requiring upload 2. You can choose not to use and continue enjoying free local features 3. Basic tools remain forever free and locally processed  Our philosophy: "Local when possible, cloud with disclosure".

Frequently Asked Questions

Core Features