How to Convert Images to PDF

Converting images to PDF is a common task for creating portfolios, submitting documents, archiving photos, and sharing multiple images as a single file. PDFs are universally viewable, maintain their layout on any device, and are the expected format for most submissions. A browser-based converter handles the entire job locally without uploading your images to a server.

When you need images as PDF

• Document submissions: many government forms, applications, and official processes require documents as PDFs, even if you only have scans or photos
• Portfolios and presentations: combine photos or design work into a single, shareable PDF
• Archiving: turn a collection of photos into one organized PDF file instead of a folder of loose images
• Printing: PDFs handle page sizes, margins, and layout consistently across different printers
• Email attachments: sending one PDF is cleaner than attaching 15 separate images
• Visa and immigration applications: passport photos, supporting documents, identity proofs almost always must be combined into one PDF
• Insurance claims: photos of damage, receipts, and reports bundled together
• Academic submissions: scanned coursework, lab notebooks, signed forms required as a single file
• Legal evidence: photographs of physical evidence, screenshots, signed documents compiled in order
• Real-estate listings: property photos sent as a single document for review

How to convert images to PDF

1. Upload your images: click "Choose Files" or drag and drop your JPG, PNG, or WebP images. You can upload multiple files.
2. Configure settings: select the page size (A4, Letter, or Fit to Image), orientation (portrait or landscape), and margin options.
3. Convert and download: click "Convert to PDF" and download your PDF document.

Choosing the right page size

A4 (210 x 297 mm): standard paper size in most countries outside North America. Use this for documents that may be printed internationally.

US Letter (8.5 x 11 in): standard paper size in the United States and Canada. Use this if the document will be printed in North America.

Fit to Image: the page matches the exact dimensions of the image. Use this when you do not plan to print and want the image to fill the page with no white borders.

A3 (297 x 420 mm): occasionally requested for large diagrams, posters, or architectural drawings. Less common in everyday workflows.

Legal (8.5 x 14 in): a longer variant of US Letter, used for legal documents in the United States and Canada.

A brief history of PDF and image embedding

PDF was created by Adobe in 1993 with version 1.0 of the specification. The original goal was simple: produce a portable document that displays identically on any computer, printer, or operating system, regardless of which fonts or applications were installed locally. This solved a real problem at the time, when sharing a Word document between Mac and Windows often meant garbled formatting, missing fonts, and unreadable output.

Image embedding has been part of PDF from the start. PDF 1.0 (1993) supported JPEG and CCITT-compressed bitmaps. JBIG2 was added in PDF 1.4 (2001) for high-compression black-and-white documents (a typical scan). JPEG 2000 was added in PDF 1.5 (2003) for higher-quality lossy compression. PDF 2.0 (2017) added support for more modern image codecs but maintained backward compatibility, so a PDF generated today still opens fine in Acrobat Reader from 1995.

This is why JPG-to-PDF is so universal: PDF was designed to embed JPGs efficiently from day one. A JPG-to-PDF conversion is essentially wrapping the JPG bytes inside a PDF container, not re-encoding. The output file is roughly the same size as the input image plus a small PDF overhead (typically under 1 KB per page).

PNG and WebP are slightly different. PNG embeds losslessly but produces larger PDFs. WebP support in PDF readers was inconsistent until around 2022, so most converters re-encode WebP to JPEG before embedding.

Image format vs PDF file size

How your image format affects the final PDF size for a typical 4 MB photo:

For a portfolio or document set, JPG at 80-90% quality usually gives the best size/quality balance.

Page orientation logic

Most converters choose orientation automatically: portrait pages for tall images, landscape pages for wide ones. You can usually override this:

• Auto: each page matches the orientation of the image. Mixed orientations produce a PDF that alternates page sides, which can be jarring when flipping through.
• Portrait everywhere: forces all pages to portrait. Wide images get scaled down to fit, which can leave horizontal white space (letterboxing).
• Landscape everywhere: forces all pages to landscape. Tall images get scaled and may have vertical white space.

For document scans (signed forms, contracts, certificates), portrait everywhere is usually right. For photo portfolios, auto orientation matches each photo. For presentation-style PDFs, landscape everywhere matches projector ratios.

Common pitfalls

• Order matters: images are placed in the PDF in the order you upload them. If the order matters (like pages of a scanned document), make sure they are in the right sequence. Filename ordering and upload order can differ depending on browser and OS.
• EXIF rotation lost in some converters: a photo shot in landscape with the phone rotated has an EXIF orientation flag telling viewers to rotate. Bad converters ignore this and embed the photo sideways. Verify before sending.
• Mixing resolutions: a 12 MP photo next to a 480x640 screenshot will produce a PDF where one page is huge and the next is tiny. Resize all images to a consistent size before converting if uniformity matters.
• Color profile mismatch: images shot in Display P3 (Apple wide gamut) embed correctly in PDF, but display differently on sRGB-only screens after conversion. Most modern PDF viewers handle this; older ones do not.
• Aspect ratio distortion: forcing every image onto an A4 page can stretch or squish proportions. "Fit to Image" preserves the original aspect ratio.
• File size explosion with PNG sources: PNG is lossless, so a PDF made from PNG screenshots is much larger than the same PDF from JPG. For mixed content, convert PNG to JPG first.
• Password-protected images: encrypted iPhone photos (rare) or zip-protected scans cannot be embedded. Decrypt first.
• Wrong DPI on resize: if the converter resamples images, choose 150 DPI for screen, 300 DPI for print. Higher DPI makes files larger without visible quality gain on most monitors.
• Multi-language filenames: some PDF tools mishandle filenames with non-ASCII characters (Cyrillic, Chinese, accented Latin). Rename to ASCII if you hit issues.

Alternative approaches

If you need a PDF with text and images together (not just a slideshow of images), consider:

• Markdown to PDF: write text in Markdown, embed images with ![alt](path), convert. Better for documents with explanatory text alongside images.
• HTML to PDF: use a webpage as the source. Better for complex layouts with tables, columns, and styled text.
• Word/Google Docs to PDF: insert images into a document, export as PDF. Best for documents with significant prose.
• Direct scan to PDF: most scanners and phone scanning apps produce a PDF directly with OCR. Better for paper documents you want to make searchable.

For pure image-to-PDF (photos, designs, scanned pages with no extra text), this tool is the simplest path.

Tips for the best results

• Order matters: images are placed in the PDF in the order you upload them. If the order matters (like pages of a scanned document), make sure they are in the right sequence.
• Compress images first: if your images are very large (5+ MB each), compress them before converting. A PDF with ten uncompressed photos can be enormous.
• Use consistent orientation: if some images are landscape and others are portrait, the PDF pages will alternate orientations, which can be jarring. Rotate images to match before converting if possible.
• Check the result: open the PDF and scroll through to make sure every image is there and in the right order before sending.
• Match the page size to the destination: A4 for international, US Letter for North America, Fit to Image for screen-only.
• Use consistent resolution: a PDF that mixes high-res and low-res images looks unprofessional. Resize before converting.
• Watermark sensitive scans: if you are converting confidential scans, watermark them with the recipient name and date before sending.
• Combine with PDF merger for complex sets: if you have multiple image batches with different orientations or page sizes, convert each batch separately, then merge.

Privacy and sensitive images

The image-to-PDF converter runs entirely in your browser. The images you upload, intermediate processing, and the PDF output all stay on your device. Nothing is uploaded to a server, logged, or shared with anyone.

This matters because the images you convert to PDF are often very sensitive: scans of passports and government IDs being prepared for visa applications, medical test results, signed contracts, photos of private locations with EXIF GPS data, screenshots of confidential systems, evidence photos for insurance claims, intimate family photos compiled for sharing with relatives. Cloud image-to-PDF services by design upload your files to their servers, often retain them for "service improvement," and have been involved in real data leaks where uploaded identity documents ended up indexed by search engines. A browser-based converter has zero exposure: the images never leave your machine.

Browser-based conversion also works offline once the page is loaded, useful for converting scans on airplanes, in secure environments without internet access, or anywhere you cannot or should not upload to a third party.