Complete Guide to PDF Tools: Merge, Split, Compress & Convert
Everything you need to know about PDF manipulation in the browser. Learn how to merge, split, compress, and convert PDFs — no software install, no upload, fully private.
Nobody loves PDFs, but you can't avoid them — leases, invoices, scanned forms, tax packets. And the moment you need to merge two of them or pull out three pages, most "free" PDF sites ask you to upload the file to their server first. For a signed contract or a bank statement, that's a non-starter. The tools below do the work inside your browser instead, so the file never leaves your machine.
Why Browser-Based PDF Tools?
Traditional PDF tools like Adobe Acrobat require installation and often upload your files to a server. Browser-based tools are different:
- No installation — open a web page and start working
- No upload — your files never leave your device
- No cost — most browser PDF tools are free
- Cross-platform — works on Windows, Mac, Linux, and mobile
FreeToolJet's PDF Merge & Split tool uses the pdf-lib library, which runs entirely in JavaScript. Your PDFs are processed locally and never sent to a server.
Merging PDF Files
Combining multiple PDFs into one is the most common PDF task. Use cases include:
- Combining scanned documents into a single file
- Merging chapters of a report into one deliverable
- Assembling a portfolio from individual pages
How to Merge PDFs
- Open the PDF Merge tool
- Drag and drop your PDF files in the order you want them combined
- Reorder files by clicking the up/down arrows
- Click "Merge PDFs"
- Download the combined file
The merged PDF preserves all text, images, and formatting from the original files. No watermarks are added.
Tips for Merging
- Order matters: arrange files before merging — the first file becomes the first pages of the output
- Check page counts: each file shows its page count so you can verify nothing is missing
- Large files: there is no file size limit, but very large PDFs (100+ MB) may take a few seconds to process
Splitting PDF Files
Splitting a PDF means extracting specific pages into a new file. This is useful when you need to:
- Share only a section of a large document
- Extract a chapter from a book or manual
- Remove sensitive pages before sharing
How to Split a PDF
- Open the PDF Split tool and switch to "Split PDF" mode
- Upload one PDF file
- Enter the page range you want to extract (e.g., pages 5 to 10)
- Click "Extract pages"
- Download the new PDF containing only those pages
The tool shows the total page count so you know the valid range. You can extract a single page (e.g., page 3 to 3) or a range (e.g., pages 1 to 20).
Converting Images to PDF
If you have scanned pages, screenshots, or photos that you want to combine into a PDF document, the Image to PDF converter handles this in your browser.
Supported Image Formats
- JPG / JPEG — most common photo format
- PNG — supports transparency, good for screenshots
- WebP — modern format with good compression
- GIF — first frame is used
How to Convert Images to PDF
- Open the Image to PDF tool
- Drag and drop your images
- Reorder by dragging (the page order matches the visual order)
- Choose a page size: A4, US Letter, or fit to image
- Click "Convert to PDF"
- Download the result
Page Size Options
| Size | Best for |
|---|---|
| Fit to image | Scans and screenshots where you want full resolution |
| A4 | Standard documents in most countries |
| US Letter | Documents for North American audiences |
Compressing PDF Files
While FreeToolJet does not currently offer a dedicated PDF compressor, you can reduce PDF file size by:
- Compressing images first: use the Image Compressor to shrink images before adding them to a PDF
- Converting to WebP: use the Image Format Converter to convert PNG to WebP or JPG before creating a PDF
- Removing unnecessary pages: use the split tool to extract only the pages you need
Privacy and Security
All PDF tools on FreeToolJet run entirely in your browser. This means:
- Your PDFs are never uploaded to any server
- Processing happens on your device using JavaScript
- You can use the tools offline once the page is loaded
- No files are stored or cached after you close the page
This is especially important for confidential documents like contracts, medical records, or financial statements. With server-based tools, you are trusting a third party with your data. With browser-based tools, you retain full control.
Common PDF Tasks Quick Reference
| Task | Tool | Time |
|---|---|---|
| Merge 3 PDFs into 1 | PDF Merge | 5 seconds |
| Extract pages 5-10 from a 50-page PDF | PDF Split | 3 seconds |
| Convert 5 JPG scans to 1 PDF | Image to PDF | 5 seconds |
| Compress images before PDF creation | Image Compressor | 2 seconds/image |
Frequently Asked Questions
Is there a file size limit? No. Since processing happens in your browser, there are no server-side limits. Very large files (100+ MB) may take longer depending on your device's available memory.
Are the tools free? Yes. All PDF tools on FreeToolJet are completely free with no signup required.
Do the tools add watermarks? No. The output PDFs are clean — no watermarks, branding, or modifications to the original content.
Can I use these tools on mobile? Yes. The tools work in mobile browsers, though the interface is optimized for desktop. You can merge, split, and convert PDFs on any device with a modern browser.
The short version
If you merge or split PDFs a few times a month, don't install Acrobat and don't hand your files to a random upload site. Bookmark the PDF Merge & Split tool and the Image to PDF converter and you're set. Everything runs locally, so it's fast, it's free, and it works on the confidential documents too.