Page Size
Orientation
Free Online Image Converter — HEIC, WebP, PNG, JPG, AVIF & 20+ Formats
How to Convert Images Online
1Upload your images
Click the upload area or drag and drop up to 10 image files (JPG, PNG, WebP, HEIC, AVIF, BMP, TIFF, GIF) onto the converter.
2Choose page size
Select A4 (international standard) or US Letter depending on your region or printing needs.
3Set orientation
Pick Portrait for vertical pages, Landscape for horizontal, or Auto to match each image automatically.
4Convert
Click Convert. The server processes your images and builds a multi-page PDF with each image centered on its own page.
5Download your PDF
Download the merged PDF. No watermarks, no signup required. Your files are deleted from the server automatically.
Supported Image Formats
HEIC
Apple photo format used by iPhone and iPad. High quality with small file size.
HEIF
High Efficiency Image Format — same as HEIC, used on Apple devices.
WebP
Modern image format by Google. Up to 30% smaller than JPG with the same quality.
PNG
Lossless format that preserves every pixel. Best for screenshots and logos.
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
BMP
Uncompressed bitmap format. Maximum quality but very large file size.
TIFF
Professional lossless format used in printing and photography.
AVIF
Next-gen format with excellent compression. Up to 50% smaller than JPG.
PPM
Portable Pixmap format used in Unix/Linux environments.
HDR
High Dynamic Range format storing extended brightness data.
FITS
Flexible Image Transport System used in astronomy and science.
PDF
Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.
AVIF vs WebP vs HEIC vs JPG
Quick comparison to help you choose the right format
AVIF
- Size: Up to 50% smaller than JPG
- Browsers: Chrome, Firefox, Safari
- Transparency: ✓
- Best for: Web performance
WebP
- Size: 25-35% smaller than JPG
- Browsers: All modern browsers
- Transparency: ✓
- Best for: Web compatibility
HEIC
- Size: ~50% smaller than JPG
- Browsers: Safari only
- Transparency: ✓
- Best for: iPhone storage
JPG
- Size: Baseline
- Browsers: All browsers & apps
- Transparency: ✗
- Best for: Universal sharing
Frequently Asked Questions
- Is there a file size limit?
- The converter accepts images up to 20 MB each. You can upload up to 10 images per batch.
- Can I reorder images before creating the PDF?
- Yes. After uploading, you can drag and drop thumbnails to set the page order. The PDF pages will follow your chosen sequence.
- What is the difference between A4 and Letter?
- A4 is 210 × 297 mm (8.27 × 11.69 in), the international standard. US Letter is 215.9 × 279.4 mm (8.5 × 11 in), used primarily in the US and Canada. A4 is slightly narrower and taller. Choose based on your region or printing requirements.
- Does it work on mobile devices?
- Yes. The converter runs in your browser and works on smartphones and tablets. You can upload photos directly from your camera roll and download the PDF to your device.
- Are my images compressed in the PDF?
- Images are encoded at 95% JPEG quality inside the PDF. At this setting, quality loss is imperceptible in photographs. The original pixel dimensions are preserved.
- Can I convert HEIC photos from my iPhone to PDF?
- Yes. HEIC and HEIF formats are fully supported. Upload your iPhone photos directly — no pre-conversion needed.
- Is the PDF searchable with OCR?
- No. The PDF contains your images as-is. Text in the images is not recognized or made searchable. For OCR, use a dedicated text recognition tool after creating the PDF.
- How many images can I combine into one PDF?
- You can upload up to 10 images per batch. For larger collections, run multiple batches and merge the resulting PDFs with any PDF merge tool.
- What happens to my files after conversion?
- Uploaded images and the generated PDF are automatically deleted from the server within a few hours. Nothing is stored permanently, and no data is shared with third parties.
- Can I mix different image formats in one PDF?
- Yes. You can upload a mix of JPG, PNG, WebP, HEIC, AVIF, BMP, TIFF, and GIF files in a single batch. They will all be combined into one PDF.
What is Images to PDF conversion?
Images to PDF conversion takes individual image files — photos, scans, screenshots, diagrams — and packages them into a single PDF document where each image occupies its own page. The result is one portable file that preserves the exact appearance of every image on any device or operating system.
This is practical in dozens of everyday situations. Freelancers combine project screenshots into a deliverable. Students merge handwritten notes they photographed into a single study guide. Accountants bundle receipt photos for expense reports. Real estate agents compile property photos into a listing document. In each case the goal is the same: turn a loose collection of images into one organized, shareable file.
How the converter works
The conversion runs entirely on the server using a Rust backend powered by libvips, one of the fastest image processing libraries available. When you upload images, each one is decoded, optionally resized, flattened to RGB (removing any alpha channel), and encoded as a high-quality JPEG stream. These streams are then embedded into a standards-compliant PDF 1.4 file.
Each image is placed on its own page. The converter calculates the optimal scale factor so the image fills as much of the page as possible without distortion: scale = min(page_width / image_width, page_height / image_height). The image is then centered on the page, meaning any remaining space appears as even margins on all sides. The aspect ratio is always preserved — your photos are never stretched or cropped.
Page size guide: A4 vs US Letter
The converter offers two standard page sizes:
A4 measures 210 × 297 mm (8.27 × 11.69 inches, or 595 × 842 points in PDF coordinates). It is the international standard used in Europe, Asia, South America, Africa, and Australia — essentially everywhere outside North America.
US Letter measures 215.9 × 279.4 mm (8.5 × 11 inches, or 612 × 792 points). It is the default paper size in the United States, Canada, and parts of Latin America.
The practical difference is small: Letter is 4.8 mm wider and 17.6 mm shorter than A4. If you plan to print the PDF, choose the size that matches your local paper standard. If the PDF is for digital viewing only, either size works — A4 is the safer default for international audiences.
Orientation options explained
Portrait orientation makes pages taller than wide — the natural choice for documents, vertical photos, and scanned pages. Landscape flips the dimensions so pages are wider than tall, which suits horizontal photos, panoramas, and widescreen screenshots.
Auto mode is the most flexible option. It examines each image individually: if the image is wider than it is tall, that page becomes landscape; if taller than wide, the page becomes portrait. This means a single PDF can contain both portrait and landscape pages, each matched to the image it holds. Auto mode minimizes wasted whitespace and is the recommended setting when your images have mixed orientations.
Why combine images into a PDF?
A PDF is a universal container. Unlike a ZIP of images that requires extraction, or a folder that loses its order when transferred, a PDF opens identically on Windows, macOS, Linux, iOS, and Android with no special software beyond a PDF reader — which every modern OS includes by default.
Combining images into a PDF also reduces friction when sharing. One email attachment replaces ten. One upload to a portal replaces a multi-select. One file in cloud storage replaces a folder. The recipient sees the images in exactly the order you intended, with consistent page dimensions.
For archival purposes, PDF is a well-established format with ISO standardization (PDF/A). A multi-page PDF of scanned documents or photographs is a durable digital record that will remain readable for decades.
Supported image formats
The converter accepts all major image formats:
JPG (JPEG) — the universal photo format, using lossy compression. Virtually every camera and phone produces JPG files. Convert JPG to PDF →
PNG — lossless compression with transparency support. Common for screenshots, graphics, and web images. Convert PNG to PDF →
WebP — Google's modern format offering smaller files than JPG at similar quality, with transparency support. Increasingly common on the web.
HEIC / HEIF — the default photo format on iPhones since iOS 11. Roughly 50% smaller than JPG at the same quality. Convert HEIC to JPG →
AVIF — a next-generation format based on AV1 video codec, offering even better compression than WebP. Growing browser support.
BMP — uncompressed bitmap, common in legacy Windows applications. Large file sizes but lossless.
TIFF — professional lossless format used in printing, archival, and photography workflows.
GIF — supports animation and 256 colors. When converting to PDF, only the first frame is used.
Image quality in the PDF
Each image is encoded as a JPEG stream inside the PDF at 95% quality by default. At this setting, compression artifacts are imperceptible to the human eye in photographs. The original pixel dimensions are preserved — a 4000×3000 photo remains 4000×3000 pixels in the PDF, ensuring the document is suitable for printing at high resolution.
Images with transparency (PNG, WebP, AVIF with alpha channel) are flattened onto a white background before encoding, since JPEG does not support transparency. If preserving transparency is critical, consider converting to PNG first and using a different workflow.
Privacy and security
All file transfers use encrypted HTTPS connections. Uploaded images are processed in memory on the server and the resulting PDF is written to temporary storage. Both the uploaded images and the generated PDF are automatically deleted within a few hours — typically much sooner. No files are stored permanently, no data is shared with third parties, and no account or personal information is required to use the tool.
The conversion engine runs on a dedicated server — your images are not sent to external APIs or cloud services. No watermarks, ads, or branding are added to your PDF.