Image to PDF Converter
Combine JPG, PNG, WebP, and BMP images into a crisp, multi-page PDF document right inside your browser. Adjust page dimensions, orientation, margins, and image compression quality with instant local download.
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PDF Layout & Quality Settings
85–90% yields crisp text scans at half the file size of raw bitmaps.
How Our Local Image-to-PDF Engine Works
When you convert sensitive documents—such as passport scans, signed client contracts, medical receipts, or
university transcripts—uploading them to a remote cloud server creates an unnecessary privacy exposure.
GPDesk's Image to PDF Converter eliminates that step by assembling a standards-compliant
%PDF-1.4 binary file directly inside your web browser's memory.
Step-by-Step Guide to Creating Clean Multi-Page PDFs
- Load Your Source Images: Click the blue dropzone or drag and drop JPG, PNG, or WebP
files from your computer or phone gallery. Because files are read via the local
FileReaderAPI, even 20+ high-resolution images load instantaneously. - Arrange Your Page Order: Each image appears as a numbered page card. Use the Move Left (←), Move Right (→), or Remove (✕) buttons on any card to sequence your multi-page document before building.
- Select Page Dimensions & Margins: Choose A4 Standard (595 × 842 pt) for international forms and academic submissions, US Letter (612 × 792 pt) for North American offices, or Fit Page to Image when exporting design portfolios or long screenshots.
- Tune Compression Quality: If an online portal enforces a strict 2 MB upload ceiling,
slide the quality control to
75%–82%. Our Canvas encoder re-quantizes each page's DCT stream while preserving full pixel dimensions so small text remains sharp. - Download Instantly: Click Build & Download PDF Locally. The browser constructs the cross-reference table (`xref`) and PDF object streams in memory and triggers an immediate file save.
Technical Specifications & Format Compatibility
Behind the scenes, each uploaded image is drawn onto an offscreen HTML5 2D Canvas normalized with a pure
white background (preventing transparent PNG channels from turning black in older PDF viewers). The canvas
is serialized into an optimized Baseline DCT JPEG byte stream and wrapped inside a PDF
/XObject /Subtype /Image /Filter /DCTDecode dictionary with exact bounding-box scaling
matrices.
Key Tool Capabilities
- ✓ Zero Cloud Uploads: Safe for KYC, tax, and legal documents.
- ✓ Multi-Page Merging: Combine dozens of receipts into one file.
- ✓ Aspect-Ratio Preservation: Never stretches or distorts photos.
- ✓ Transparency Normalization: Converts transparent PNGs cleanly onto white paper.
- ✓ No Watermarks: Clean output ready for official filing.
Want to Dive Deeper?
Read our comprehensive engineering tutorial on DPI resolution math and PDF stream packaging:
Read the Image-to-PDF Engineering Guide →Image to PDF Converter – Frequently Asked Questions
Why does my transparent PNG have a black background on other converters?
Many basic converters dump raw RGBA bytes without compositing alpha channels, causing PDF viewers to render transparent pixels as black. GPDesk composites a pure white (`#FFFFFF`) paper layer underneath every transparent PNG before encoding.
Can I combine both portrait and landscape photos into one PDF?
Yes. Our layout engine automatically calculates the bounding box of each individual image and centers it proportionally inside your chosen A4 or Letter page with uniform margins, so mixed-aspect photos never look stretched.
How do I keep my output PDF under 1 MB for a government portal?
Set the Image Encoding Quality slider between 65% and 78%. If your source photos are 12-megapixel phone shots, you can also run them through our Smart File Compressor first to cap resolution at 1600px.
Does this tool work offline on mobile phones?
Yes. Once `image-to-pdf.html` is open in Chrome on Android or Safari on iPhone, you can convert camera roll photos into a multi-page PDF even with mobile data and Wi-Fi turned off.
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