#1PDF tools in the browser: merge, split, compress, and watermark locally

What we tested: We merged, split, and compressed PDF files using the WASM-based tools on this site. Processing was done entirely in the browser with files ranging from 100 KB to 50 MB.

PDFs are still the default format for a lot of real work, but most PDF tools are either expensive or cloud-based.

The local-first workflow is simple: do the common PDF tasks in your browser, keep the file on your machine, and avoid uploading sensitive documents anywhere else.

#2Why PDF Privacy Matters More Than You Think

When you upload a PDF to a cloud-based tool, you are sharing its complete contents with a third party. Consider what PDFs typically contain:

• Contracts and legal documents: Trade secrets, financial terms, personal information
• Invoices and financial records: Account numbers, payment details, tax IDs
• Medical documents: Health records protected by privacy regulations
• Technical documentation: Proprietary architecture, API specifications, security configurations
• Resumes and personal documents: Home addresses, phone numbers, work history

Browser-based PDF tools eliminate this risk entirely. The files are processed in your browser's JavaScript runtime using libraries like PDF.js. Nothing is uploaded. Nothing is stored.

#21. PDF Merger: Combine Multiple PDFs Into One

The most common PDF task. You have five separate invoices and need them in one document. You have a cover letter and a resume that need to be a single file. You have split documentation that needs to be unified.

The PDF Merger lets you:

• Drag and drop multiple PDF files
• Reorder pages with drag-and-drop
• Preview pages before merging
• Download the combined PDF instantly

#3When to Use It

• Combining invoices for expense reports
• Merging a cover letter with a resume for job applications
• Unifying documentation chapters into a single reference
• Assembling presentation handouts from multiple sources
• Creating submission packages for legal or compliance filings

#3Practical Example

A freelance developer needs to submit a payment package: invoice, timesheet, and signed contract. Instead of emailing three attachments, they merge all three into one professional PDF in seconds.

#22. PDF Splitter: Extract Pages From Large Documents

The reverse of merging. You have a 50-page report but only need pages 12-15. You need to extract the signature page from a contract. You want to separate a multi-chapter document into individual files.

The PDF Splitter provides:

• Page range selection (e.g., pages 5-10)
• Individual page extraction
• Visual page preview before splitting
• Instant download of extracted pages

#3When to Use It

• Extracting specific sections from lengthy reports
• Separating signed pages from a contract for record-keeping
• Breaking a large manual into chapter-sized files
• Pulling out individual forms from a multi-form PDF

#23. PDF Compressor: Reduce File Size for Email and Storage

PDFs with embedded images, fonts, and graphics can balloon to enormous sizes. Email attachment limits (typically 10-25MB), storage quotas, and upload restrictions make compression essential.

The PDF Compressor reduces file size while maintaining readability.

#3Compression Results You Can Expect

#3When to Use It

• Before attaching PDFs to emails
• Uploading documents to size-limited web forms
• Archiving old documents to save storage space
• Sharing files through messaging apps with file size limits

#24. PDF Watermark: Protect Confidential Documents

Adding a watermark to a PDF signals that the document is confidential, a draft, or for specific eyes only. It also creates a deterrent against unauthorized distribution.

The PDF Watermark tool lets you:

• Add text watermarks (e.g., "CONFIDENTIAL", "DRAFT", "SAMPLE")
• Control opacity, rotation, size, and color
• Apply to all pages or specific page ranges
• Preview the watermark before downloading

#3When to Use It

• Marking documents as "CONFIDENTIAL" before internal distribution
• Adding "DRAFT" stamps to work-in-progress documents
• Labeling "SAMPLE" on preview documents shared externally
• Adding recipient names to track document distribution

#25. PDF Password Protection: Lock Sensitive Documents

When a PDF contains sensitive information, password protection adds a critical layer of security. The PDF Password tool encrypts your PDF with a password.

#3When to Use It

• Protecting financial documents before emailing
• Securing legal contracts shared via cloud storage
• Locking personnel documents in shared drives
• Adding access control to client-facing reports

Best Practice: Always share the password through a different channel than the document itself. Send the PDF by email and the password by text message, or vice versa.

#26. PDF Text Extraction: Pull Text From Any PDF

Need to copy text from a PDF that does not allow selection? Need to extract data from a scanned document? The PDF Text tool extracts all readable text from any PDF.

#3When to Use It

• Copying content from locked or protected PDFs
• Extracting data from PDF forms for database entry
• Converting PDF content to plain text for search indexing
• Pulling quotes from research papers or documentation

#27. PDF to Images: Convert Pages to PNG or JPG

Sometimes you need PDF pages as images, for presentations, social media, or embedding in web pages. The PDF to Images tool converts each page to a high-resolution image.

#3When to Use It

• Creating slide images from PDF presentations
• Embedding PDF content in blog posts or documentation
• Sharing specific pages on social media
• Creating image previews of PDF documents

#28. Images to PDF: Create PDFs From Photos and Screenshots

The reverse workflow. You have a collection of receipt photos, whiteboard snapshots, or scanned pages that need to become a single PDF. The Images to PDF tool combines multiple images into one downloadable PDF.

#3When to Use It

• Creating PDF receipts from phone photos for expense reports
• Combining whiteboard photos into a meeting notes document
• Assembling a portfolio from individual image files
• Converting scanned pages into a proper PDF document

#29. PDF Metadata Viewer: See What Your PDFs Reveal

Like images with EXIF data, PDFs contain metadata: author name, creation software, creation date, modification history, and sometimes even the file path of the original document. The PDF Metadata tool shows all embedded metadata.

#3What to Check Before Sharing

• Author field: May contain your real name or username
• Creator/Producer: Shows what software created the PDF
• Creation/Modification dates: Reveals document timeline
• Custom metadata: Some tools embed internal identifiers

#210. PDF Viewer: Read PDFs Without Adobe

A lightweight, fast, browser-based PDF Viewer that opens any PDF file locally. No Adobe Reader installation required. No cloud upload needed.

#211. PDF Organizer: Reorder and Manage Pages

Need to rearrange pages within a PDF? Remove blank pages? Reorder a document's structure? The PDF Organizer provides a visual drag-and-drop interface for page management.

#2The Complete PDF Workflow

For teams that handle PDFs regularly, here is an efficient workflow:

1. Review metadata before sharing any PDF externally
2. Compress large PDFs before emailing or uploading
3. Watermark confidential documents before distribution
4. Password protect sensitive files
5. Merge related documents into single packages
6. Split only the relevant pages when sharing partial documents
7. Extract text when you need PDF content in other formats

Every step happens in your browser. No software installation. No file uploads. No privacy risk.

#2Summary

PDFs are everywhere, and handling them should not require expensive software or risky cloud uploads. From merging and splitting to compression and watermarking, browser-based PDF tools give you full control over your documents without ever sending them to a third-party server.

Explore the complete PDF toolkit at AllDevToolsHub.

#3About the Author

Written by Rahul Jalavadiya, founder of AllDevToolsHub. All tools run locally in your browser. Every tool we build runs in the browser by default. The workflows in this article are ones we use and test ourselves.

#2Sources / Further reading

• ISO - PDF 2.0 (ISO 32000-2:2020)
• pdf-lib - JavaScript PDF library
• Mozilla - pdf.js project