Drop images here or click to upload
PNG, JPG, WebP supported — Processed entirely in your browser
A4 / Letter / Legal Dimensions
| Size | Millimeters | Common Use |
|---|---|---|
| A4 | 210 × 297 mm | International standard. Europe, Asia, most of the world. |
| Letter | 216 × 279 mm | North American standard. US, Canada, Mexico. |
| Legal | 216 × 356 mm | US legal documents, contracts, court filings. |
| Custom | Image size | Each PDF page matches the exact dimensions of the source image. |
When to Convert Images to PDF?
Document Scanning
Photograph paper documents with your phone and merge into a single PDF for emailing or archiving. Perfect for invoices, receipts, and forms.
Portfolio PDFs
Combine artwork, design mockups, or photography into a presentable PDF portfolio to share with clients.
Report Compilation
Gather screenshots, charts, and diagrams into one structured PDF report without needing desktop software.
E-book Creation
Compile illustrated pages or comic book panels into a multi-page PDF for distribution as a digital book.
Optimizing Images for PDF
When photographing documents for print, aim for at least 200 DPI. For professional printing, 300 DPI ensures text remains sharp in the PDF output.
Screen-only PDFs (viewed on monitors, tablets) work perfectly at 72–96 DPI — the native resolution of most displays. Smaller file size.
Use an image compressor on large photos before converting to PDF. Photographic images at quality 80 are virtually indistinguishable from originals.
What is Image to PDF Conversion?
Image to PDF conversion is the process of embedding one or more image files — PNG, JPG, WebP — into a single PDF (Portable Document Format) document. It is one of the most common document operations today, particularly when you need to send multiple images as a single file, preserve page order, or share content that is readable on every device and operating system.
PDF was developed by Adobe in 1993 with the goal of creating documents that display consistently across all operating systems and devices regardless of the software used to create them. Unlike JPG or PNG, PDF is a multi-page container format — perfect for bundling multiple images into a single portable file that can be downloaded, shared via email, printed, or archived indefinitely.
How to Create a PDF from Images
This tool uses the browser's Canvas API to process everything client-side — no image data is ever transmitted to a server. The workflow:
- Step 1: Upload one or more images. Drag and drop multiple files at once or click to select from your device.
- Step 2: Arrange page order using the up/down arrow buttons. The order in the list equals the order of pages in the PDF.
- Step 3: Choose page size — A4 (international standard), Letter (North America), Legal (US legal documents), or Custom (match each image's native dimensions).
- Step 4: Select orientation (portrait/landscape) and margin width for the content area.
- Step 5: Click "Create PDF" — the PDF is generated entirely in your browser and downloads instantly.
Page Size Guide
Choosing the right page size is essential for a professional-looking PDF:
- A4 (210 × 297 mm / 8.27 × 11.69 in): International standard used in Europe, Asia, and most of the world. Correct choice for reports, contracts, and official documents outside North America.
- Letter (8.5 × 11 in / 216 × 279 mm): North American standard. Use when submitting documents to US or Canadian recipients.
- Legal (8.5 × 14 in / 216 × 356 mm): Taller than Letter, used for legal agreements, contracts, and court filings in the United States.
- Custom: Each PDF page matches the exact pixel dimensions of the source image — ideal for art portfolios, photo books, comic panels, or product photography where no white borders should appear.
Orientation tip: Landscape (horizontal) photos look best on landscape-oriented pages. Portrait (vertical) photos belong on portrait pages. For Custom size, orientation has no effect since the page dimensions are derived from each image.
Optimizing Images for PDF
The file size of the resulting PDF depends directly on the resolution and compression of the input images. Key optimization strategies:
- Compress images first: Use an image compressor to reduce file size before converting to PDF. A quality setting of 80 is virtually indistinguishable from the original for photographic content.
- Resize large images: If your images come from a high-resolution camera (24 MP+), resize them to 2000–3000px first. Extremely large images bloat PDF file size without meaningful improvement for screen viewing.
- Match DPI to purpose: Screen viewing → 72–96 DPI is sufficient. Standard print → 150–200 DPI. Professional print → 300 DPI.
- Avoid huge PNG files: Lossless PNG for photographic content can be very large. Convert to JPG first to significantly reduce the resulting PDF size.
Common Issues and Solutions
- Images look blurry in PDF: The source image has low resolution. Replace with a higher quality version. PDF conversion cannot sharpen images.
- PDF is too large: Compress and resize images before creating the PDF. See the optimization tips above.
- Images appear rotated: Phone camera photos sometimes have incorrect EXIF orientation. Rotate the image before adding it to the PDF queue.
- Wrong page order: Use the up/down arrows in the image list to rearrange before clicking Create PDF.
- Image gets clipped: Select "Custom" page size so each PDF page exactly matches the source image dimensions without cropping.
Related tools: PNG to JPG, Image Compressor, Image Resizer.
Frequently Asked Questions
You Might Also Like
PNG to JPG Converter
Convert PNG images to JPG format instantly. Free, fast, and works right in your browser with no uploads.
Image Compressor
Compress PNG, JPG, and WebP images instantly in your browser. Reduce file sizes by up to 80% with an adjustable quality slider. Free, private, no uploads.
Image Resizer
Resize images to any dimension online for free. Platform presets for Instagram, Facebook, Twitter, YouTube, and LinkedIn. No upload required.
JPG to PNG Converter
Convert JPG images to lossless PNG in your browser. No uploads, no quality loss. Free and instant.
About Image Tools
Image tools handle the everyday tasks that used to require Photoshop — resizing for social media, compressing for faster page loads, converting between formats like PNG, JPEG, WebP, and SVG, removing backgrounds, and adjusting opacity. Modern browsers run these operations client-side, meaning your photos never leave your device. That's a meaningful privacy win compared to uploading to a server in another country.
Why it matters
Images account for 45-60% of a typical web page's weight. Optimizing them is the single highest-leverage performance improvement most sites can make — a 500 KB PNG resized to 80 KB WebP loads 6x faster without visible quality loss. For creators, social platforms enforce specific dimensions (YouTube 2560×1440 banners, Twitter 1500×500 headers, Instagram 1080×1080 posts) so converters that nail the exact pixel count save hours of trial-and-error cropping.
Privacy and safety
All ZestLab image tools run entirely in your browser using modern Web APIs (Canvas, Blob, OffscreenCanvas). Your images are never uploaded to a server. No account required, no tracking pixel on the image, no watermark added. This is the only way we can honestly promise your photo stays private — if an image tool requires 'upload', it's being processed server-side and your data is out of your control.
Best practices
- For web delivery, choose WebP (smaller) over PNG for photos — 25-35% file size savings with no quality loss
- Keep JPEG quality at 82-85% for the best compression/quality tradeoff (most viewers can't see 90+ vs 85)
- SVG is best for logos, icons, and illustrations — it scales infinitely without blur and is often smaller than PNG
- Strip EXIF metadata from photos you publish online (GPS coordinates, camera serial, timestamps often leak)