Most online PDF utilities require you to upload your sensitive contracts, tax documents, or medical records to remote cloud servers. PDFSulab changes that completely: every single tool runs 100% client-side inside your browser using modern WebAssembly and JavaScript. Your files never travel across the internet, ensuring total privacy, zero upload lag, and native device processing speed.
Here is the complete, step-by-step master guide on how to use every one of our 41 free PDF tools.
Quick Navigation: The 5 Tool Categories
- Organize & Page Management (Tools 1–9)
- Splitting & Advanced Numbering (Tools 10–17)
- Edit & Optimize (Tools 18–25)
- Convert & Scan (Tools 26–33)
- Security, Forms & Metadata (Tools 34–41)
1.Organize & Page Management
1. Merge PDF
Combine multiple individual PDF documents into one continuous file.
- How to Use:
- Open Merge PDF and drop two or more PDF files into the dropzone.
- Drag and drop file cards horizontally to rearrange their sequence.
- Click Merge PDF to instantly generate and download the single consolidated file.
- Pro-Tip: Ideal for combining monthly bank statements, receipts, or project chapters.
2. Split PDF
Divide a multi-page PDF into separate standalone documents.
- How to Use:
- Upload your multi-page PDF file.
- Specify the target page ranges (e.g., 1-3, 5, 8-12).
- Click Split PDF to download the extracted ranges as a single ZIP or separate files.
3. Organize PDF
Visually reorder, delete, and manage individual pages across an interactive thumbnail canvas.
- How to Use:
- Open Organize PDF and select your document.
- Drag page thumbnails into your desired order.
- Hover over unwanted pages and click the trash icon to discard them.
- Click Save Organized PDF to download.
4. Rotate PDF
Permanently fix upside-down or sideways pages across portrait and landscape layouts.
- How to Use:
- Upload the PDF file.
- Click Rotate Left (90°) or Rotate Right (90°) globally, or rotate specific pages individually.
- Click Apply Rotation and download your corrected document.
5. Delete PDF Pages
Strip out redundant cover pages, blank sheets, or confidential sections.
- How to Use:
- Upload your PDF.
- Select the specific page numbers you wish to remove (e.g., 1, 4, 7-9) or click directly on thumbnails.
- Hit Remove Pages to export the cleaned document.
6. Extract PDF Pages
Pull specific pages out of a massive document while keeping the original file intact.
- How to Use:
- Select your document.
- Enter the exact page numbers you want to extract.
- Choose whether to merge them into a single new document or export them as individual one-page files.
- Click Extract.
7. Alternate & Mix PDF
Merge two separate scans (such as odd and even page batches from a manual duplex scanner).
- How to Use:
- Upload Document A (Odd pages: 1, 3, 5…) in Slot 1.
- Upload Document B (Even pages: 2, 4, 6… or reversed) in Slot 2.
- Select your mixing sequence (Normal or Reverse second file).
- Click Mix PDFs to assemble the perfectly collated book.
8. N-Up PDF Layout
Print multiple document pages onto a single sheet (e.g., 2-up, 4-up) to save paper.
- How to Use:
- Select your PDF file.
- Choose the grid configuration (2 pages per sheet, 4 pages per sheet, etc.).
- Set orientation (Portrait/Landscape) and page borders.
- Click Generate N-Up PDF.
9. Flip PDF
Mirror or reflect PDF page contents across the horizontal or vertical axis.
- How to Use:
- Drop your PDF file into the workspace.
- Select Horizontal Flip (left-to-right mirror) or Vertical Flip (upside-down reflection).
- Click Apply Flip and download the transformed document.
2. Splitting & Advanced Numbering
10. Split PDF in Half
Equally divide any document into two symmetrical halves with one click.
- How to Use:
- Upload any document with 2 or more pages.
- The tool automatically detects the midpoint (e.g., a 20-page document splits into 1–10 and 11–20).
- Click Split in Half to download both parts.
11. Split PDF by Size
Chop massive PDF files into smaller chunks that fit email attachment limits.
- How to Use:
- Drop a large document (e.g., 40 MB).
- Enter your target threshold per file (e.g., 10 MB).
- The local engine computes clean page-break boundaries and exports parts that never exceed the specified size.
12. Split PDF by Text
Automatically break documents wherever a specific word or phrase appears (e.g., “Invoice #”, “Chapter”, “Employee Name”).
- How to Use:
- Upload the multi-record PDF.
- Type the separator keyword into the trigger box.
- Click Split by Trigger to export individual invoices or chapter documents.
13. Add Page Numbers
Stamp clean, customizable page numbers across an entire document.
- How to Use:
- Upload your file.
- Choose position (Top/Bottom, Left/Center/Right).
- Select your numbering format (e.g., Page X of Y or simple integer 1, 2, 3).
- Click Stamp Numbers.
14. Bates Numbering
Apply standardized, sequential alphanumeric identifiers required for legal and court discovery.
- How to Use:
- Drop your legal exhibits or case files.
- Specify prefix (e.g., CASE-001-), starting number (e.g., 0001), and digit padding.
- Select stamp location and font style.
- Click Apply Bates Stamping.
15. Add Header & Footer
Inject company names, confidential disclaimers, or date stamps to page margins.
- How to Use:
- Select your document.
- Type your desired header (top margin) and footer text (bottom margin).
- Adjust font family, font size, and color.
- Click Apply Headers/Footers.
16. PDF Bookmarks
Build or edit hierarchical bookmark outlines for effortless navigation inside PDF readers.
- How to Use:
- Upload your document.
- Click Add Bookmark, enter title, and link it to the target page index.
- Nest secondary entries under parent headings as needed.
- Click Save Bookmarks.
17. Deskew PDF
Automatically detect and straighten crooked pages resulting from scanner misalignments.
- How to Use:
- Drop scanned document pages.
- The local image-processing engine analyzes line angles and auto-corrects orientation.
- Preview the straightened pages and click Save Deskewed PDF.
3. Edit & Optimize
18. Edit PDF
Add text annotations, draw shapes, highlight sentences, and insert custom images.
- How to Use:
- Open Edit PDF and drop your file.
- Use the top toolbar to select Text, Pencil, Rectangle, or Image overlay tools.
- Click anywhere on the page canvas to position your additions.
- Click Export Document to render and save.
19. Compress PDF
Dramatically decrease PDF file size without sacrificing legible text or crisp layout.
- How to Use:
- Upload your PDF document.
- Choose your compression profile:
- Basic Compression: High visual quality, moderate size reduction.
- Strong Compression: Maximum reduction, ideal for web uploads and emails.
- Watch the local engine compress your file and show real-time percentage savings before downloading.
20. Crop PDF
Trim away excess outer margins, scanner artifacts, or crop specific page sections.
- How to Use:
- Upload the PDF.
- Drag the visual bounding box over the exact area you wish to keep.
- Choose whether to apply the crop box to the current page or all pages.
- Click Crop & Download.
21. Resize PDF
Change document canvas dimensions to standard international paper formats (A4, US Letter, Legal, A3).
- How to Use:
- Select your PDF file.
- Choose the target page format from the dropdown (e.g., convert US Letter to standard A4).
- Choose scaling options (fit proportionally or center).
- Click Apply Resize.
22. Grayscale PDF
Convert full-color documents to pure monochrome black-and-white.
- How to Use:
- Upload your colored PDF.
- Click Convert to Grayscale.
- The browser strips all RGB color profiles, reducing printing ink usage and file weight.
23. Flatten PDF
Merge form fields, digital signatures, and layered annotations into one un-editable, permanent graphic layer.
- How to Use:
- Upload an interactive form or signed contract.
- Click Flatten PDF.
- The engine permanently locks all form fields so recipient readers cannot alter values.
24. Repair PDF
Recover data and rebuild broken cross-reference tables from corrupted, unreadable PDFs.
- How to Use:
- Upload the damaged PDF file.
- The client-side parser reconstructs missing header tags and damaged internal object streams.
- Download the repaired, readable document.
25. Delete Annotations
Strip away sticky notes, pencil scribbles, highlighter lines, and comments before publishing.
- How to Use:
- Drop your commented document.
- Select annotation types to strip (Highlights, Comments, Pop-ups).
- Click Purge Annotations to export a clean document.
4. Convert & Scan
26. OCR PDF Scanner
Extract machine-readable, searchable text from image-only scans or phone photos using local WebAssembly Tesseract OCR.
- How to Use:
- Upload an image scan or unsearchable PDF.
- Select the recognition language (e.g., English).
- Click Start OCR. Watch your browser’s local CPU process pages and produce a fully selectable, searchable PDF.
27. PDF to JPG
Convert every page of a PDF document into high-resolution JPG images.
- How to Use:
- Drop your PDF document.
- Choose target image quality (Standard 150 DPI or Ultra 300 DPI).
- Click Convert to JPG to download all pages individually or bundled in a single ZIP.
28. JPG to PDF
Turn photos, document snapshots, or graphic designs into a polished PDF document.
- How to Use:
- Select or drag multiple JPG photos into the uploader.
- Rearrange the photo sequence.
- Choose page orientation (Auto, Portrait, or Landscape) and margin padding.
- Click Build PDF.
29. PNG to PDF
Convert transparent PNG graphics, screenshots, and visual designs into clean PDF pages.
- How to Use:
- Upload PNG image files.
- Set layout parameters (Page dimensions and margin spacing).
- Click Create PDF to package your PNGs into a unified document.
30. PDF to Text
Rip out pure plain-text content (.txt) from your PDF for easy copying, editing, or data analysis.
- How to Use:
- Drop any text-based PDF file.
- Click Extract Text.
- Instantly copy all text to your clipboard or download the raw .txt file.
31. Scan to PDF
Capture documents directly using your mobile phone camera or desktop webcam and generate a clean PDF.
- How to Use:
- Open Scan to PDF and allow camera permission.
- Frame your receipt or page in the viewfinder and click Capture.
- Review captured frames and click Generate PDF.
32. Extract Images
Extract every embedded photographic asset and diagram hidden inside a PDF document.
- How to Use:
- Upload any PDF containing pictures.
- The engine scans the internal object tree and extracts every native image file without quality loss.
- Download images as a clean ZIP package.
33. Create PDF Forms
Build fillable, interactive PDF questionnaires, text boxes, and checkbox forms from scratch.
- How to Use:
- Upload a blank or existing PDF page.
- Drag and drop form controls (Text Field, Checkbox, Radio Button, Dropdown) onto the page.
- Customize field names and export your interactive fillable form.
5. Security, Forms & Metadata
34. Protect PDF (Encrypt)
Lock your confidential files with military-grade 128-bit/256-bit AES password encryption.
- How to Use:
- Select your document.
- Enter a strong password in the prompt.
- Click Encrypt & Protect. Your file now requires this password to open in Adobe Acrobat or any PDF reader.
- Zero-Leak Guarantee: Passwords are never sent to a server; hashing occurs entirely in your browser memory.
35. Unlock PDF (Decrypt)
Permanently remove password protection from PDFs you own so you don’t have to enter it every time.
- How to Use:
- Upload your password-locked PDF.
- Enter the valid user password when prompted.
- Click Unlock Document to export a clean, unencrypted copy.
36. Fill & Sign PDF
Type into form fields, add checkmarks, draw your handwritten digital signature, and sign contracts.
- How to Use:
- Open Fill & Sign and drop your agreement or application form.
- Click Signature to draw with your mouse/touchscreen, type your name, or upload a signature image.
- Place your signature on the signature line, fill out date fields, and click Download Signed PDF.
37. Watermark PDF
Protect your intellectual property by stamping custom text or corporate logos across all pages.
- How to Use:
- Select your document.
- Type your watermark text (e.g., CONFIDENTIAL, DRAFT) or upload a logo image.
- Adjust angle, font size, and opacity slider.
- Click Apply Watermark.
38. Edit PDF Metadata
Update internal document properties including Title, Author, Subject, and Keywords.
- How to Use:
- Upload the PDF.
- Modify metadata fields in the form editor.
- Click Update Metadata to save the sanitized file.
- Pro-Tip: Crucial for SEO indexing of online research papers and eBooks.
39. Remove Metadata
Strip out hidden author names, creation software history, and device identification data before publishing public files.
- How to Use:
- Drop your PDF file.
- Click Wipe All Metadata.
- The local engine strips the entire metadata dictionary, anonymizing the document.
40. Rename PDF
Quickly rename your file using clean naming conventions without navigating complex desktop file managers.
- How to Use:
- Upload your file.
- Type the new filename prefix or pattern.
- Click Save Renamed PDF to trigger a clean browser download.
41. Encrypt PDF
Apply granular security restrictions such as disabling printing, copying text, or editing.
- How to Use:
- Upload your document.
- Set owner/master permissions (check or uncheck Printing, Text Extraction, Annotation rights).
- Click Apply Restrictions to export the secured document.
Frequently Asked Questions (FAQ)
Are my files stored on PDFSulab servers?
No. PDFSulab is strictly a client-side web application. All document manipulation (merging, splitting, OCR, compression, encryption) is executed locally inside your device’s browser sandbox using WebAssembly. Your files never touch an external server or database.
What is the maximum file size supported?
Because processing relies on your device’s RAM, you can comfortably process documents up to 50 MB (and often much larger on modern desktop computers) with no artificial limits on page count.
Does PDFSulab work without an internet connection?
Yes. Once the application assets are loaded in your browser tab, you can disconnect your Wi-Fi or turn on Airplane Mode, and every tool will continue to function seamlessly offline.
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