AppsFactory

Images to PDF Converter

Convert multiple images into a single PDF document

Page Size Settings

Privacy & Security - 100% Client-Side Processing

All image processing and PDF creation happens entirely in your browser. Your files are never uploaded to any server, ensuring complete privacy and security. The PDF is generated entirely on your device using client-side JavaScript.

Images to PDF Converter Documentation

Overview

The Images to PDF Converter is a powerful, privacy-focused tool that combines multiple images into a single PDF document. Upload photos, screenshots, or any images, arrange them in your desired order, and convert them to a professional PDF - all in your browser with complete privacy.

Key Features

🔒 Complete Privacy

  • 100% Client-Side Processing: All conversion happens in your browser using JavaScript
  • No Server Uploads: Your images never leave your device
  • Zero Data Collection: We don't store, analyze, or transmit your images
  • Offline Capable: Works without an internet connection once the page is loaded

🖼️ Multiple Image Support

  • Batch Upload: Upload multiple images at once
  • All Formats: Supports JPEG, PNG, GIF, WebP, BMP, and more
  • Unlimited Images: No artificial limit on number of images
  • Preview Thumbnails: See each image before conversion

🔄 Flexible Ordering

  • Drag & Drop: Click and drag images to reorder pages
  • Arrow Buttons: Use up/down arrows for precise positioning
  • Visual Feedback: Clear numbering and hover effects
  • Real-Time Updates: Order changes reflected immediately

📄 Professional Page Layout

  • A4 Standard (Default): International standard paper size (210mm × 297mm)
  • Letter Size: US standard paper size (8.5" × 11")
  • Uniform Width: All pages same width, heights adjust proportionally
  • Original Size: Keep exact image dimensions (variable page sizes)

⚡ Smart Image Processing

  • Auto Format Conversion: Converts all image formats to PDF-compatible format
  • Quality Preservation: High-quality JPEG conversion at 95%
  • Aspect Ratio Maintained: Images never distorted or stretched
  • Centered Layout: Images centered on standard page sizes
  • White Background: Transparent images get white background

📥 Easy Download

  • Instant Download: Get your PDF immediately after conversion
  • Auto-Named: File named images-converted.pdf
  • Quick Reset: "Convert More Images" button to start over

How to Use

Step 1: Choose Page Size Settings

Before uploading images, select your preferred page size:

A4 (210mm × 297mm) - Recommended ✨

  • Best for: Standard documents, printing, universal compatibility
  • Behavior: Images scaled to fit A4 page, centered with margins
  • Result: All pages exactly 210mm × 297mm (standard international paper)
  • Use when: Creating printable documents, professional reports, or standard PDFs

Letter (8.5" × 11")

  • Best for: US-based documents, American standard printing
  • Behavior: Images scaled to fit Letter page, centered with margins
  • Result: All pages exactly 8.5" × 11" (standard US paper)
  • Use when: Printing in the US, submitting to US organizations

Uniform Width

  • Best for: Screenshots, web content, variable-height images
  • Behavior: All pages have same width (matches widest image), heights vary
  • Result: Consistent width across all pages, proportional heights
  • Use when: Converting screenshots, infographics, or web captures

Original Size

  • Best for: Preserving exact pixel dimensions, technical images
  • Behavior: No scaling applied, uses exact image dimensions
  • Result: Page sizes vary based on each image's dimensions
  • Use when: Need exact pixel-perfect reproduction (not recommended for printing)

Recommendation: Use A4 for most purposes - it provides uniform, professional pages suitable for printing and sharing.

Step 2: Upload Images

  1. Click the upload area or drag-and-drop images onto it
  2. Select multiple image files from your device
  3. Supported formats: JPEG, JPG, PNG, GIF, WebP, BMP, TIFF, etc.
  4. Wait for images to load and display

During Upload:

  • Loading spinner shows processing status
  • "Processing Images..." message appears
  • Thumbnails generate automatically
  • Image dimensions and sizes detected

What Gets Captured:

  • File name
  • File size
  • Image dimensions (width × height)
  • Preview thumbnail
  • Original image data

Step 3: Arrange Image Order

Your images appear in a list showing:

  • Drag Handle: Grip icon (⋮⋮) for dragging
  • Order Number: Numbered badges (1, 2, 3...)
  • Thumbnail: 64×64px preview of each image
  • File Info: Name, size, and dimensions
  • Controls: Up/down arrows and remove button

Reordering Methods:

Method 1: Drag & Drop (Recommended)

  1. Click and hold the grip icon or anywhere on an image card
  2. Drag the image to your desired position
  3. Drop it between other images
  4. Numbers update automatically

Method 2: Arrow Buttons

  1. Click the up arrow (↑) to move an image up one position
  2. Click the down arrow (↓) to move an image down one position
  3. First and last images have disabled arrows (can't move beyond ends)

Method 3: Remove and Re-add

  1. Click the X button to remove an image
  2. Upload it again if needed
  3. New images appear at the end of the list

Important: The PDF will contain images in the exact order shown, from top to bottom. Page 1 = first image, Page 2 = second image, etc.

Step 4: Review and Adjust

Before converting:

  • Check Order: Verify images are in correct sequence
  • Remove Unwanted: Click X to remove any images you don't need
  • Verify Count: Ensure you have all desired images
  • Double-Check Settings: Confirm page size is correct

Tip Box Reminder: "Drag and drop images to reorder them, or use the arrow buttons. The PDF will contain images in this exact sequence from top to bottom."

Step 5: Convert to PDF

  1. Click the "Convert to PDF" button
  2. Wait for conversion to complete
  3. Progress indicated by:
    • Button text changes to "Converting to PDF..."
    • Loading spinner animation
    • Button disabled during conversion

Conversion Time:

  • Small images (< 1MB): ~1-2 seconds per image
  • Large images (1-5MB): ~2-5 seconds per image
  • Very large images (> 5MB): ~5-10 seconds per image
  • Total time depends on number and size of images

What Happens During Conversion:

  1. Each image is processed individually
  2. Format conversion if needed (to JPEG)
  3. Image embedded into PDF document
  4. Page created with selected size
  5. Image scaled and positioned on page
  6. PDF document compiled

Step 6: Download Your PDF

Once conversion completes:

  • Success Message: Green checkmark with "PDF Created Successfully!"
  • Image Count: Shows number of images included
  • Download Button: Big green "Download PDF" button
  • Convert More: Option to create another PDF

To Download:

  1. Click the "Download PDF" button
  2. File downloads as images-converted.pdf
  3. Check your browser's download folder
  4. Rename file if desired

To Create Another PDF:

  1. Click "Convert More Images"
  2. Previous images and PDF are cleared
  3. Return to settings screen
  4. Upload new images and repeat process

Use Cases

Business & Professional

Presentation Materials

  • Convert slides exported as images into a PDF
  • Combine product photos into a catalog
  • Create visual reports from charts and graphs

Documentation

  • Combine scanned document pages into one PDF
  • Create instruction manuals from step-by-step images
  • Assemble receipts and invoices into organized PDFs

Portfolio Creation

  • Combine design work into a portfolio PDF
  • Create project showcases from screenshots
  • Assemble before/after images for case studies

Marketing Materials

  • Convert social media graphics into a PDF lookbook
  • Create downloadable resources from infographics
  • Assemble promotional materials into one document

Education & Academia

Homework & Assignments

  • Convert handwritten work (photos) into PDF submissions
  • Combine problem solutions into one document
  • Create study guides from whiteboard photos

Research Documentation

  • Combine experiment photos into research PDFs
  • Create visual documentation of field work
  • Assemble lab result images into reports

Teaching Materials

  • Convert presentation slides to PDF handouts
  • Create visual lesson materials from images
  • Assemble educational posters into distributable PDFs

Student Projects

  • Combine project photos into presentation PDFs
  • Create art portfolios from artwork images
  • Assemble science fair documentation

Content Creation

Social Media Content

  • Convert Instagram carousel posts to PDFs
  • Create downloadable guides from social images
  • Assemble Twitter threads into PDF format

Blog & Website

  • Create downloadable resources from blog images
  • Convert infographic series into PDF guides
  • Assemble tutorial images into step-by-step PDFs

Photography

  • Create client proof sheets from photo shoots
  • Assemble photo series into storyboard PDFs
  • Create portfolio PDFs from selected images

Design Work

  • Convert design iterations into review PDFs
  • Create mood boards from reference images
  • Assemble UI/UX mockups into presentation PDFs

Personal Use

Family & Memories

  • Convert family photos into printable albums
  • Create recipe books from food photos
  • Assemble travel photos into trip PDFs

Organization

  • Convert important documents (photos) to PDF
  • Create reference materials from screenshots
  • Assemble how-to guides from instructional images

Hobbies & Projects

  • Document DIY projects with step-by-step photos
  • Create garden journals from plant photos
  • Assemble craft projects into portfolios

Event Planning

  • Create event programs from design mockups
  • Assemble venue photos into comparison PDFs
  • Create invitation previews from design images

Technical Details

Image Processing

Supported Input Formats

  • JPEG/JPG: Used directly (most efficient)
  • PNG: Used directly, transparency converted to white background
  • GIF: Converted to JPEG (only first frame used for animations)
  • WebP: Converted to JPEG
  • BMP: Converted to JPEG
  • TIFF: Converted to JPEG
  • Other formats: Attempted conversion to JPEG

Conversion Process

  1. Original JPEG files: Embedded directly (fastest, best quality)
  2. PNG files: Embedded directly, fallback to JPEG if issues
  3. Other formats: Canvas conversion to JPEG at 95% quality
  4. Transparent images: White background applied before conversion
  5. Failed conversions: Automatic retry with JPEG conversion

Quality Settings

  • JPEG conversion: 95% quality (high quality, reasonable file size)
  • No upscaling: Images never enlarged beyond original size
  • Aspect ratio: Always preserved (no distortion)
  • Color space: RGB for all conversions

PDF Generation

PDF Library

  • Technology: pdf-lib (JavaScript PDF manipulation library)
  • Version: Latest stable release
  • Standard: PDF 1.7 compatible
  • Features: Embedded images, custom page sizes

Page Dimensions

  • A4: 595 × 842 points (210mm × 297mm)
  • Letter: 612 × 792 points (8.5" × 11")
  • Uniform Width: Variable (based on widest image)
  • Original: Exact image dimensions in pixels converted to points

Image Scaling & Positioning

For A4 and Letter sizes:

  1. Calculate image aspect ratio
  2. Calculate page aspect ratio
  3. Scale image to fit within page (maintaining aspect ratio)
  4. Center image horizontally and vertically
  5. No upscaling (images smaller than page are not enlarged)

For Uniform Width:

  1. Find widest image in collection
  2. Scale all images to match that width
  3. Calculate proportional heights
  4. Create pages with calculated dimensions

For Original Size:

  1. Use exact image dimensions
  2. No scaling applied
  3. Page size = image size

Browser Requirements

Minimum Requirements

  • Chrome/Edge: Version 90+
  • Firefox: Version 88+
  • Safari: Version 14+
  • Opera: Version 76+
  • JavaScript: Must be enabled
  • Canvas API: Required for image conversion
  • File API: Required for file handling

Recommended Specifications

  • RAM: 2GB+ free memory
  • CPU: Modern processor (2015+)
  • Browser: Latest version
  • Connection: Not required after initial page load

Performance Considerations

Processing Speed

  • Simple images (photos): ~1-2 seconds per image
  • Complex images (high resolution): ~3-5 seconds per image
  • Conversion time: Proportional to total image size

Memory Usage

  • Base: ~50MB for application
  • Per image: ~5-20MB depending on resolution
  • Large batches (50+ images): May require 500MB+ RAM
  • Memory released after download

File Size Estimates

Output PDF size depends on:

  • Number of images
  • Image dimensions
  • Original image quality
  • Compression level

Typical sizes:

  • 10 photos (3MB each): ~20-30MB PDF
  • 20 screenshots (500KB each): ~8-12MB PDF
  • 50 document scans (2MB each): ~80-100MB PDF

Optimization Tips

  • Compress images before uploading for smaller PDFs
  • Use JPEG format for photos (already optimized)
  • Reduce image dimensions if exact size not needed
  • Consider splitting large batches into multiple PDFs

Tips & Best Practices

Choosing the Right Page Size

✅ Use A4 for:

  • Standard documents for international use
  • Professional reports and presentations
  • Content that will be printed
  • When sharing with international audiences
  • General-purpose PDFs

✅ Use Letter for:

  • Documents for US-based recipients
  • Submissions to US organizations
  • US standard printing
  • American business documents

✅ Use Uniform Width for:

  • Screenshots of websites or applications
  • Infographics with varying heights
  • Social media content
  • Web-based content preservation

✅ Use Original Size for:

  • Technical documentation requiring exact pixels
  • Design files needing precise dimensions
  • Digital-only content (not for printing)
  • When page uniformity is not important

Image Preparation

Before Uploading:

  1. Rename Files: Use descriptive names before upload
  2. Check Orientation: Rotate images if needed
  3. Crop Unwanted Areas: Remove extra space or borders
  4. Compress Large Files: Reduce size for faster processing
  5. Organize: Have images in desired order in your folder

Image Quality:

  • For Printing: Use 300 DPI or higher resolution images
  • For Screen: 72-150 DPI is sufficient
  • File Size: Balance quality vs. file size (1-5MB per image ideal)

Optimal Workflow

Efficient Process:

  1. Prepare and organize images on your computer first
  2. Select page size before uploading
  3. Upload all images at once (not one by one)
  4. Review thumbnails to verify correct images
  5. Arrange order using drag-and-drop
  6. Double-check order and count
  7. Convert and download

Batch Processing:

  • Process similar images together (all screenshots, all photos, etc.)
  • Keep batches reasonable (10-30 images for best performance)
  • Create multiple PDFs for very large collections
  • Name downloaded PDFs descriptively immediately

Quality Considerations

For Best Quality:

  • Start with high-resolution source images
  • Use JPEG for photos (native format, no conversion needed)
  • Use PNG for graphics with text
  • Choose A4 or Letter for standard page sizes
  • Avoid upscaling (don't use images smaller than page size)

For Smallest File Size:

  • Compress images before uploading
  • Use JPEG format (smaller than PNG)
  • Lower resolution images (if acceptable)
  • Fewer images per PDF

For Fastest Processing:

  • Use JPEG format (no conversion needed)
  • Smaller image dimensions
  • Fewer images per batch
  • Close other browser tabs

Troubleshooting

Upload Issues

Problem: Images won't upload

  • Solution: Ensure files are valid image formats
  • Check: File extensions (.jpg, .png, .gif, etc.)
  • Try: Open images in an image viewer to verify they're valid
  • Note: Some proprietary formats may not be supported

Problem: "Not an image file" error

  • Solution: File may have wrong extension or be corrupted
  • Check: Verify file is actually an image
  • Try: Re-save the image in a standard format (JPEG or PNG)
  • Convert: Use an image editor to convert to JPEG first

Problem: Upload is very slow

  • Solution: Large images take time to process
  • Expected: 5MB+ images may take 5-10 seconds each
  • Optimize: Resize or compress images before uploading
  • Patience: Wait for thumbnails to appear before proceeding

Problem: Thumbnails don't appear

  • Solution: Browser may be processing, wait a moment
  • Check: Look for "Processing Images..." message
  • Refresh: Reload page and try again if stuck
  • Browser: Update to latest browser version

Ordering Issues

Problem: Drag and drop doesn't work

  • Solution: Ensure JavaScript is enabled
  • Alternative: Use arrow buttons instead
  • Try: Click and hold grip icon specifically
  • Refresh: Reload page if feature stopped working

Problem: Images jump to wrong position

  • Solution: Drag slowly and wait for hover highlight
  • Tip: Drop between items, not on top of them
  • Alternative: Use arrow buttons for precise control

Problem: Can't move first/last image

  • Explanation: First image can't move up, last can't move down
  • Solution: Use drag-and-drop to move to middle, then arrows
  • Design: This prevents errors

Conversion Issues

Problem: "Failed to convert" error

  • Solution: One or more images may be corrupted
  • Identify: Remove images one by one to find problematic file
  • Fix: Re-save problematic image in image editor
  • Try: Convert problematic image to JPEG first

Problem: Conversion takes very long

  • Solution: Large or many images take time
  • Expected: 50+ images may take several minutes
  • Wait: Don't close browser tab during conversion
  • Reduce: Try fewer images or smaller file sizes

Problem: Browser becomes unresponsive

  • Solution: Too many large images for available memory
  • Reduce: Convert in smaller batches (10-20 images)
  • Memory: Close other tabs and applications
  • Restart: Close and reopen browser, try again

Problem: Images appear distorted in PDF

  • Check: This shouldn't happen (aspect ratio preserved)
  • Verify: Open PDF in multiple viewers
  • Report: If issue persists, may be a bug
  • Workaround: Try different page size setting

Download Issues

Problem: Download button doesn't work

  • Solution: Check browser download settings
  • Permissions: Ensure downloads are allowed
  • Popup: Check if popup was blocked
  • Try: Right-click and "Save Link As"

Problem: Downloaded PDF is blank or corrupted

  • Solution: Conversion may have failed
  • Try: Convert again from scratch
  • Check: Ensure conversion completed (saw success message)
  • Verify: All images were valid before converting

Problem: PDF won't open

  • Solution: Download may have been interrupted
  • Try: Download again (don't close page during download)
  • Check: File size should be > 0 bytes
  • Reader: Try different PDF viewer

Problem: Images appear in wrong order in PDF

  • Solution: Conversion uses order shown in list
  • Verify: Check order before clicking Convert
  • Fix: Convert again with correct order

Frequently Asked Questions

General Questions

Q: Is there a limit on number of images?
A: No artificial limit, but browser memory limits practical maximum to 100-200 images depending on size and your device.

Q: What's the maximum file size for images?
A: Individual images up to 50MB should work. Total batch size depends on available browser memory.

Q: Can I convert animated GIFs?
A: Yes, but only the first frame is used. Each frame won't become a separate page.

Q: Will the PDF preserve image quality?
A: Yes, JPEG conversion is at 95% quality. PNG images may be converted to JPEG with minimal quality loss.

Q: Can I add text or annotations?
A: No, this tool only combines images into PDF. Use a PDF editor to add text or annotations after conversion.

Q: Can I password-protect the PDF?
A: No, the generated PDF is not password-protected. Use a PDF editor to add password protection after download.

Page Size Questions

Q: What's the difference between A4 and Letter?
A: A4 (210×297mm) is international standard. Letter (8.5×11") is US standard. A4 is slightly taller and narrower.

Q: Which page size should I use?
A: Use A4 for international documents or European printing. Use Letter for US documents. Either works for digital-only PDFs.

Q: Why are there white margins in my PDF?
A: Images are scaled to fit within the page while maintaining aspect ratio. Margins ensure images aren't cut off.

Q: Can I remove the white margins?
A: Use "Original Size" to eliminate margins, but pages will vary in size. For uniform pages, margins are necessary.

Q: What does "Uniform Width" mean?
A: All pages have the same width (matches widest image). Heights vary proportionally. Good for screenshots.

Technical Questions

Q: Why are some images converted to JPEG?
A: PDF creation is more reliable with JPEG. PNG works directly but may fall back to JPEG if issues occur.

Q: What happens to transparent PNG images?
A: Transparent areas are filled with white before conversion, as PDF pages need a background.

Q: Can I use this offline?
A: Yes, once the page loads, everything works offline since processing is in your browser.

Q: Does this work on mobile devices?
A: Yes, but performance may be limited. Best results with desktop/laptop browsers.

Q: Why is my PDF file size so large?
A: PDF size depends on image sizes. Compress images before uploading to reduce final PDF size.

Privacy & Security Questions

Q: Are my images uploaded to a server?
A: No. All processing happens in your browser. Images never leave your device.

Q: Can I use this for confidential images?
A: Yes, since everything is processed locally. However, always follow your organization's security policies.

Q: Is there any tracking or analytics on my images?
A: No. We don't track, log, or analyze your images in any way.

Q: What happens to my images after I close the browser?
A: All data is immediately cleared from browser memory. Nothing is stored.

Q: Is the PDF stored anywhere?
A: No. The PDF is generated in memory and downloaded directly. No copies are stored.

Browser Compatibility

Fully Supported Browsers

✅ Desktop Browsers

  • Google Chrome 90+ (Windows, macOS, Linux)
  • Microsoft Edge 90+ (Windows, macOS)
  • Mozilla Firefox 88+ (Windows, macOS, Linux)
  • Safari 14+ (macOS)
  • Opera 76+ (Windows, macOS, Linux)
  • Brave (latest version)

✅ Mobile Browsers

  • Chrome Mobile (Android 10+)
  • Safari Mobile (iOS 14+)
  • Samsung Internet (Android)
  • Firefox Mobile (Android, iOS)

⚠️ Limited Support

  • Older browser versions may work with reduced performance
  • Mobile browsers have memory limitations for large batches

❌ Not Supported

  • Internet Explorer (any version)
  • Very old browsers without modern JavaScript support

Required Browser Features

  • HTML5 Canvas API: For image conversion
  • File API: For reading image files
  • Blob/URL APIs: For PDF download
  • Drag & Drop API: For reordering (optional)
  • ES6+ JavaScript: Modern JavaScript features

Privacy & Security

How Your Privacy is Protected

Local Processing Only

  • All image processing and PDF creation happens in your browser
  • No data transmitted to external servers
  • No cloud storage or temporary online files
  • You have complete control over your images

No Data Collection

  • We don't log file names or content
  • We don't track conversion history
  • We don't analyze image content
  • We don't store any user data
  • No cookies or tracking pixels

Open Source Technology

  • Built with open-source libraries (pdf-lib)
  • Transparent, auditable code
  • No hidden functionality
  • Community-reviewed security

Security Best Practices

For Confidential Images:

  • Use on a secure, trusted device
  • Avoid public computers
  • Clear browser cache after use
  • Don't leave converted PDFs on shared devices

For Sensitive Information:

  • Verify your network is secure (but files aren't transmitted anyway)
  • Close browser tab when finished
  • Delete downloaded PDFs when no longer needed
  • Follow your organization's security policies

General Security:

  • Keep your browser updated
  • Use antivirus software
  • Be cautious with images from unknown sources
  • Scan downloaded PDFs with antivirus if concerned

Limitations & Known Issues

Current Limitations

  • Cannot add page numbers to PDF
  • Cannot add headers or footers
  • Cannot add watermarks
  • Cannot merge with existing PDFs (images only)
  • Cannot split or extract pages
  • Cannot edit images before conversion
  • GIF animations only use first frame
  • Limited by browser memory for very large batches

Known Issues

  • Very large batches (100+ images) may cause slowdown
  • Mobile devices struggle with many large images
  • Some exotic image formats may not convert
  • Browser download limits may affect "Download All" feature

Planned Features

  • Custom page margins
  • Image rotation within PDF
  • Page numbering
  • Header/footer support
  • Multiple PDF output (split into volumes)
  • Watermark support
  • Compression options

Related Tools

Explore other PDF and image tools on AppsFactory:

  • PDF Merger - Combine multiple PDFs into one
  • PDF to Images - Extract PDF pages as images
  • Image Compressor - Reduce image file sizes
  • Image Resizer - Resize images to specific dimensions
  • Image Editor - Edit images with filters and effects

Credits & Technology

Built With

Core Libraries

  • pdf-lib - JavaScript PDF creation and manipulation
  • React - User interface framework
  • Next.js - Web application framework

UI Components

  • Tailwind CSS - Styling and design system
  • Lucide Icons - Beautiful, consistent icons
  • Canvas API - HTML5 image processing

Open Source

This tool is built entirely with open-source technologies:

  • pdf-lib: MIT License
  • React: MIT License
  • Next.js: MIT License
  • All processing happens client-side

Support & Feedback

Getting Help

If you encounter issues:

  1. Check the Troubleshooting section above
  2. Verify your images are valid
  3. Try with a different browser
  4. Check browser console for errors

Providing Feedback

We'd love to hear from you:

  • Report bugs and issues
  • Suggest new features
  • Share your use cases
  • Rate your experience

Stay Updated

  • Check for new features regularly
  • Follow us for tool updates
  • Share with others who might find it useful

Last Updated: November 2025
Version: 1.0.0
License: Free to use

AppsFactory - Privacy-first tools for everyone. Created by Gorav Singal.