Help Center
Learn how to use PDFSub tools with step-by-step guides, tips, and troubleshooting help.
Tool Guides
How to Merge PDFs
Combine multiple PDF documents into a single file.
Step-by-Step Guide
- 1Click 'Select Files' or drag and drop your PDF files into the upload area.
- 2Your files will appear in a list. Drag them to reorder if needed.
- 3Click the 'Merge PDFs' button to combine all files.
- 4Once processing is complete, click 'Download' to save your merged PDF.
Tips & Best Practices
- •You can merge as many PDFs as you need - there's no limit.
- •Drag files to rearrange them before merging.
- •This tool processes files entirely in your browser for maximum privacy.
Troubleshooting
Files won't upload
Make sure your files are PDF format. Try refreshing the page and uploading again.
Merge button is disabled
You need at least 2 PDF files to merge. Add more files to enable the button.
How to Split PDFs
Divide a PDF into separate files or extract specific pages.
Step-by-Step Guide
- 1Upload your PDF file by clicking 'Select File' or dragging it into the upload area.
- 2Preview all pages in your document.
- 3Choose to split all pages into individual files, or select specific pages to extract.
- 4Click 'Split' or 'Extract' to process your selection.
- 5Download your split PDF files.
Tips & Best Practices
- •Click on page thumbnails to select which pages to extract.
- •Use Shift+Click to select a range of pages.
- •Split creates one file per page; Extract creates one file with selected pages.
Troubleshooting
Pages don't appear
Wait for the PDF to fully load. Large files may take longer to render thumbnails.
Can't select pages
Make sure you're clicking directly on the page thumbnails.
How to Compress PDFs
Reduce PDF file size while maintaining quality.
Step-by-Step Guide
- 1Upload your PDF file.
- 2The tool will automatically analyze and compress your PDF.
- 3Review the compression results showing original and new file size.
- 4Download your compressed PDF.
Tips & Best Practices
- •PDFs with high-resolution images see the best compression results.
- •Text-only PDFs may not compress significantly - they're already small.
- •The compression is lossless for text; images may be optimized.
Troubleshooting
File size didn't decrease much
Some PDFs are already optimized. Text-heavy documents compress less than image-heavy ones.
Quality looks reduced
Our compression balances size and quality. For critical documents, keep the original as backup.
How to Rotate PDF Pages
Rotate pages 90, 180, or 270 degrees.
Step-by-Step Guide
- 1Upload your PDF file.
- 2View the page thumbnails and select which pages to rotate.
- 3Choose the rotation angle: 90° clockwise, 90° counter-clockwise, or 180°.
- 4Click 'Rotate' to apply changes.
- 5Download your corrected PDF.
Tips & Best Practices
- •Select multiple pages to rotate them all at once.
- •Use 180° rotation for upside-down pages.
- •Preview shows the rotation before you apply it.
Troubleshooting
Rotation not applying
Make sure you've selected at least one page before clicking rotate.
Wrong pages rotated
Check your page selection. Deselect all and try selecting the correct pages again.
How to Delete PDF Pages
Remove unwanted pages from your PDF.
Step-by-Step Guide
- 1Upload your PDF file.
- 2View all pages as thumbnails.
- 3Click on the pages you want to delete to select them.
- 4Click 'Delete Selected' to remove those pages.
- 5Download your updated PDF.
Tips & Best Practices
- •Your original file is never modified - we create a new PDF without the deleted pages.
- •Select multiple pages to delete them in one action.
- •Double-check your selection before deleting.
Troubleshooting
Deleted wrong pages
Simply upload your original file again and try once more.
Delete button is disabled
You need to select at least one page to delete. Click on page thumbnails to select them.
How to Extract PDF Pages
Create a new PDF from selected pages.
Step-by-Step Guide
- 1Upload your PDF file.
- 2Preview all pages in the document.
- 3Click on the pages you want to keep in your new PDF.
- 4Click 'Extract' to create a new PDF with only the selected pages.
- 5Download your extracted PDF.
Tips & Best Practices
- •Extract is the opposite of Delete - you choose what to keep, not what to remove.
- •Great for pulling specific chapters or sections from a larger document.
- •You can select non-consecutive pages.
Troubleshooting
Extract button disabled
Select at least one page by clicking on the thumbnails.
Pages in wrong order
Pages appear in the order they exist in the original document, not the order you selected them.
How to Reorder PDF Pages
Rearrange pages in your PDF document.
Step-by-Step Guide
- 1Upload your PDF file.
- 2View all pages as draggable thumbnails.
- 3Drag pages to their new positions.
- 4Click 'Save' when you're happy with the new order.
- 5Download your reorganized PDF.
Tips & Best Practices
- •Drag and drop pages to move them anywhere in the document.
- •Great for fixing incorrectly scanned documents.
- •You can move multiple pages at once by selecting them first.
Troubleshooting
Can't drag pages
Click and hold on a page thumbnail, then drag it to the new position.
Order didn't save
Make sure to click the Save button before downloading.
How to Add Watermarks
Add text watermarks to protect your documents.
Step-by-Step Guide
- 1Upload your PDF file.
- 2Enter your watermark text (e.g., 'CONFIDENTIAL', 'DRAFT', your company name).
- 3Adjust opacity if desired.
- 4Click 'Add Watermark' to apply.
- 5Download your watermarked PDF.
Tips & Best Practices
- •Watermarks appear diagonally across each page.
- •Use lower opacity for subtle watermarks that don't obscure content.
- •Keep watermark text short for best appearance.
Troubleshooting
Watermark too dark
Reduce the opacity slider to make the watermark more transparent.
Watermark not visible
Increase the opacity or check that you entered watermark text.
How to Convert PDF to Images
Convert PDF pages to JPG or PNG images.
Step-by-Step Guide
- 1Upload your PDF file.
- 2Choose your output format: PNG (lossless) or JPG (smaller file size).
- 3Click 'Convert' to process all pages.
- 4Download your images individually or as a batch.
Tips & Best Practices
- •PNG is best for documents with text - it stays crisp.
- •JPG is better for photos and creates smaller files.
- •Each page becomes a separate image file.
Troubleshooting
Images are blurry
Try PNG format for sharper results, especially for text-heavy pages.
Conversion is slow
Large PDFs with many pages take longer. Be patient - complex documents need more processing time.
How to Convert Images to PDF
Create a PDF from multiple images.
Step-by-Step Guide
- 1Upload your images (JPG, PNG, GIF, or WebP).
- 2Drag images to arrange them in your desired order.
- 3Click 'Create PDF' to combine all images into a single PDF.
- 4Download your new PDF document.
Tips & Best Practices
- •You can upload multiple images at once.
- •Reorder images before converting - the order determines page order.
- •Images are embedded at their original quality.
Troubleshooting
Image not uploading
Check that your file is a supported format (JPG, PNG, GIF, or WebP).
Images in wrong order
Drag and drop images in the preview to rearrange before creating the PDF.
How to Password Protect PDFs
Encrypt your PDF with AES-256 password protection.
Step-by-Step Guide
- 1Upload your PDF file.
- 2Enter a strong password (8+ characters with mixed case, numbers, and symbols).
- 3Confirm your password.
- 4Click 'Protect' to encrypt the PDF.
- 5Download your password-protected PDF.
Tips & Best Practices
- •Use a strong, unique password you can remember.
- •Write down the password - we cannot recover it if you forget.
- •AES-256 is bank-level encryption used by financial institutions.
Troubleshooting
Password doesn't work when opening
Passwords are case-sensitive. Make sure Caps Lock is off and try again.
Forgot the password
Unfortunately, we cannot recover passwords. You'll need to use the original unprotected file.
How to Unlock Password-Protected PDFs
Remove password protection from PDFs (password required).
Step-by-Step Guide
- 1Upload your password-protected PDF file.
- 2Enter the document's password.
- 3Click 'Unlock' to remove the password protection.
- 4Download the unlocked PDF.
Tips & Best Practices
- •You must know the correct password - we cannot crack or bypass passwords.
- •The unlocked PDF is a new file; your original remains protected.
- •Use this to create shareable versions of documents you own.
Troubleshooting
Wrong password error
Double-check your password. Passwords are case-sensitive.
Don't know the password
Contact the document's original owner to get the password. We cannot bypass protection.
How to Convert Bank Statements
Convert PDF bank statements to Excel, CSV, JSON, or accounting formats.
Step-by-Step Guide
- 1Upload your PDF bank statement.
- 2Our AI analyzes and extracts all transaction data.
- 3Review the extracted transactions in the preview table.
- 4Choose your export format: Excel, CSV, JSON, OFX, QBO, QFX, or QIF.
- 5Download your spreadsheet file.
Tips & Best Practices
- •Works with statements from any bank worldwide.
- •For best results, use the PDF downloaded directly from your bank.
- •After downloading, spot-check a few transactions against your original statement to verify accuracy.
Troubleshooting
Transactions not extracted correctly
Scanned PDFs may have lower accuracy. Try a native PDF from your bank's online portal.
Some transactions missing
Check if your statement has multiple pages - all pages are processed automatically.
Dates in wrong format
You can adjust date formats in Excel after downloading, or contact support for custom formatting.
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