JPG ➜ PDF
Drag & Drop JPG files here
or click to select files (max 50MB each)
Files (drag to reorder):
📄 Output Settings
📐 Layout Settings
📋 Page Settings
🎨 Quality Settings
%
🔍 Scale Settings
Fit: Scale to fit within bounds • Fill: Scale to fill space (may crop) • Original: Keep original size • Custom: Manual percentage
📏 Margins (mm)
Adjust space around images on pages
🏷️ PDF Metadata
🎯 Image Options
mm
📋 Page Layout Preview
Processing...
✅ Conversion Complete!
File Format Conversion
JPG to PDF Converter
Advanced client-side image to document conversion with professional layout controls
🔒 Privacy and Security
This converter operates entirely within your browser using client-side JavaScript processing. Your JPG images are converted to PDF format without any data transmission to external servers, ensuring complete privacy and data security.
0
Server Uploads
100%
Local Processing
∞
Processing Speed
🔐
Private Data
All image processing, scaling calculations, and PDF generation occur in your device's memory. Files remain on your computer throughout the entire conversion process and are automatically cleared from browser memory upon completion.
⚙️ Conversion Process
Image Analysis
Decode JPEG binary data and extract image properties
→
Layout Calculation
Compute page dimensions and image positioning
→
Quality Processing
Apply compression and DPI optimization
→
PDF Generation
Embed images in PDF structure with metadata
The conversion process begins with JPEG decompression, extracting pixel data and EXIF metadata. Image dimensions are analyzed to determine optimal page orientation using aspect ratio calculations:
Aspect Ratio = Image Width ÷ Image Height
Auto-rotation trigger: Image AR > 1.0 AND Page AR < 1.0
Auto-rotation trigger: Image AR > 1.0 AND Page AR < 1.0
Scale calculations utilize geometric transformations to fit images within defined boundaries while preserving visual quality. DPI conversion follows the formula:
Physical Size (mm) = (Pixel Dimension ÷ DPI) × 25.4
PDF Coordinate = Physical Size × (72 ÷ 25.4)
PDF Coordinate = Physical Size × (72 ÷ 25.4)
📋 Usage Examples
Photography Portfolio
Convert high-resolution photos to print-ready PDF at 300 DPI with A3 pages
Document Scanning
Combine scanned receipt photos into single PDF with auto-rotation enabled
Presentation Slides
Four images per page layout with custom margins for presentation handouts
Technical Diagrams
Original size preservation for engineering drawings with 600 DPI output
Product Catalogs
Two images per page with 5mm spacing for retail catalog generation
Mobile Screenshots
Portrait orientation screenshots combined with fill scaling mode
Art Gallery Prints
Custom 150% scaling with fit mode for enlarged display prints
Real Estate Listings
Auto-fit multiple property photos with 15mm margins on Legal paper
Medical Documentation
X-ray images at original size with metadata preservation for records
Educational Materials
Separate PDFs for each diagram with 80% quality optimization
📊 Technical Specifications
Input Format Support
- JPEG✓ Full support
- JPG✓ Full support
- File Size Limit50MB per image
- Color ModesRGB, Grayscale
- Bit Depth8-bit, 24-bit
- EXIF DataRead and preserved
PDF Output Options
- PDF Version1.4 Compatible
- CompressionJPEG DCT
- Color SpaceRGB, DeviceGray
- MetadataTitle, Author, Creator
- Password ProtectionNot supported
- File Size Range100KB - 500MB
Page Dimensions
- A4210 × 297 mm
- Letter216 × 279 mm
- A3297 × 420 mm
- Legal216 × 356 mm
- Auto SizeFit to content
- OrientationPortrait, Landscape, Auto
Quality Settings
- Quality Range10% - 100%
- DPI Options72, 150, 300, 600
- Scale ModesFit, Fill, Original, Custom
- Custom Scale10% - 500%
- Aspect RatioMaintained or stretched
- Auto-rotationWide image detection
🎯 Settings Impact Analysis
Quality vs File Size Relationship: Reducing quality from 100% to 80% typically decreases PDF file size by 40-60% while maintaining visually acceptable image fidelity for most applications.
DPI Selection Impact: Higher DPI settings increase image resolution in the PDF but significantly impact file size. 72 DPI is optimal for screen viewing, 150 DPI balances quality and size for general use, 300 DPI is required for professional printing, and 600 DPI is reserved for high-precision technical documentation.
Scale Mode Behavior: The "Fit" mode preserves aspect ratios and ensures complete image visibility within page boundaries. "Fill" mode may crop images but maximizes space utilization. "Original" maintains pixel-perfect reproduction at specified DPI. "Custom" allows precise control over image dimensions with percentage-based scaling.
Layout Optimization: Multiple images per page reduce total page count but may compromise individual image size. Auto-fit mode calculates optimal image arrangement based on aspect ratios and available space. Margin settings directly affect usable page area and should be adjusted based on printing requirements.
Usable Area = Page Dimensions - (Margintop + Marginbottom) × (Marginleft + Marginright)
Image Density = Images per Page ÷ Usable Area
Image Density = Images per Page ÷ Usable Area
Memory Usage Estimation: Processing requirements scale with image resolution and quantity. Typical memory usage ranges from 20-100MB for standard photo conversion, with peak usage occurring during simultaneous multi-image processing.
📄 Input and Output Format Details
JPEG Input Processing: The converter reads JPEG files using native browser APIs, extracting both image data and metadata. Progressive JPEG encoding is fully supported, with automatic deinterlacing during processing. Color profile information is preserved when present in EXIF data.
Image Data Extraction: Pixel data is accessed through HTML5 Canvas API, enabling real-time image manipulation and quality adjustment. The converter supports images with dimensions up to 32,767 × 32,767 pixels, limited by browser canvas constraints rather than file format specifications.
PDF Structure Generation: Output PDFs conform to PDF 1.4 specification standards, ensuring compatibility with all modern PDF viewers and printers. Each image is embedded as a compressed object stream within the PDF structure, with coordinate systems calculated in PDF units (1/72 inch).
Color Space Handling: RGB color images are processed in sRGB color space, while grayscale images maintain their original luminance values. No color profile conversion is performed, preserving original color accuracy for professional applications.
Compression Algorithms: JPEG images retain their original DCT compression when embedded in PDF format. Additional PDF-level compression is applied to metadata and structure elements, but image data remains in JPEG format to prevent quality degradation from recompression.
Browser Compatibility: Requires modern browsers supporting HTML5 Canvas, File API, and JavaScript ES6 features. Optimal performance achieved with hardware-accelerated graphics rendering enabled.