Can I combine 50 or more images into one PDF?

The upload limit is 30 images per conversion. For larger sets, split your images into batches of 30 or fewer, convert each batch to a separate PDF, then use our PDF merge tool to combine all the resulting PDFs into one document.

What DPI should I choose for my PDF?

Use 72 DPI for documents that will only be viewed on screen (email attachments, web uploads). Use 150 DPI for general-purpose sharing where someone might print the document. Use 300 DPI for professional printing, archival submissions, or documents where fine detail matters — like floor plans, medical images, or identity documents.

Will my images lose quality when converted to PDF?

At 300 DPI with quality set to "High," there is no perceptible quality loss for standard photo prints. JPEG recompression can introduce minor artefacts at lower quality settings. For lossless preservation, use PNG source images and enable "Lossless" mode in advanced settings — the trade-off is a significantly larger PDF file.

Can I add text or annotations to the PDF after converting images?

Image-to-PDF conversion creates a PDF where each page is a full-page image. To add text, use our PDF annotation tools or convert the result with OCR first. Alternatively, open the PDF in any PDF editor that supports adding text boxes over images.

Does the tool handle scanned documents that are rotated or skewed?

Enable "Auto-Deskew" in the advanced settings to automatically straighten pages that are tilted up to 15 degrees. This is especially useful for phone-scanned documents. For pages rotated 90, 180, or 270 degrees, use the per-image rotation controls before converting.

Is there a difference between converting JPG vs PNG to PDF?

JPG uses lossy compression — the image is slightly compressed each time it is re-encoded. For photos, this is usually imperceptible. PNG uses lossless compression and is better for screenshots, diagrams, logos, and text-heavy images where sharp edges matter. The PDF output from PNG source images at 300 DPI produces crisper text than JPG at the same resolution.

PDF Tools2026-05-10

How to Convert Images to PDF: The Complete Guide to JPG-to-PDF Conversion

Converting images to PDF serves two distinct purposes: it packages photos or scans into a universally readable format, and it combines multiple images into a single, sequentially organised document. Whether you are scanning receipts with your phone, compiling a design portfolio, or submitting identity documents for verification, an image-to-PDF converter transforms loose image files into a polished, professional PDF in seconds. Our free tool handles JPG, PNG, WebP, and HEIC formats, supports batch uploads of up to 30 images at once, and processes everything in your browser — your photos never touch a remote server. The output respects your specified page size (A4, Letter, or custom), applies your chosen margin and DPI settings, and arranges pages in the exact order you define. This guide covers everything from source image selection and quality optimisation to compliance considerations like PDF/A for archival submissions.

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Image to PDF Converter

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Step-by-Step Guide

Upload and Arrange Your Images

Drag and drop your images onto the upload area or click to browse. You can add JPG, PNG, WebP, HEIC, and BMP files — up to 30 images per conversion. Once uploaded, each image appears as a thumbnail card. Drag the cards to reorder them; the first card becomes page 1, the second becomes page 2, and so on. For document scanning use cases (like combining photos of a multi-page contract), make sure the pages are in reading order before proceeding. You can remove individual images by clicking the X on any card without affecting the rest of the queue.

Configure Output Settings

Select your page size — A4 (210 x 297 mm) for most regions, Letter (8.5 x 11 inches) for North America, or "Fit to Image" to preserve each image's native aspect ratio without cropping. Set your margin preference: None, Narrow (5 mm / 0.2 in), Normal (12.7 mm / 0.5 in), or Wide (25.4 mm / 1 in). Choose your DPI: 72 DPI for screen-only viewing produces the smallest files; 150 DPI is a good balance for most uses; 300 DPI is recommended for printing or archival. For image orientation, choose Auto (the tool detects portrait vs landscape), Portrait, or Landscape.

Generate and Download Your PDF

Click "Convert to PDF" and the tool processes all images into a single PDF document. Processing time depends on the number of images and your chosen DPI — 10 images at 150 DPI typically complete in under 5 seconds. A preview of the first page is shown. Click "Download PDF" to save the file. The download name defaults to the date and image count (e.g., "2026-05-10-15-images.pdf"). If the file size is larger than expected, re-convert at a lower DPI or choose a higher JPEG compression level in the advanced settings.

Tips & Best Practices

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JPG images at 300 DPI produce PDFs that are roughly 200-400 KB per page. The same images at 72 DPI produce pages around 40-80 KB — a 5x to 10x size difference that matters when emailing.

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PNG source images with transparency are flattened to a white background in the PDF. If you need transparency preserved, convert to a format that supports it in PDF (like PDF/X-4) using desktop software instead.

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For documents scanned with a phone camera, enable "Auto-Enhance" in the advanced settings. This applies contrast adjustment and deskew correction — a 2019 study by the Document Recognition Lab at the University of Salford found that basic auto-enhancement improves OCR accuracy on phone-scanned documents by 23-31%.

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When combining images of different aspect ratios (e.g., a wide landscape photo and a tall portrait screenshot), use "Fit to Image" page size to avoid white bars or cropping on any page.

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For archival submissions that require PDF/A compliance, check the "PDF/A-2b" option. This embeds all fonts and colour profiles, removes JavaScript and external dependencies, and ensures the file is self-contained for long-term preservation per ISO 19005-2.

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HEIC images from iPhones are roughly 50% smaller than equivalent JPGs but contain the same visual quality. If uploading HEIC files, the converter decodes them at full resolution — no quality is lost in the conversion pipeline.

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If your PDF will be printed professionally, export at 300 DPI with CMYK colour space enabled. RGB images auto-converted to sRGB in PDFs can shift colours when printed on offset presses; CMYK avoids this.

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A 30-image PDF at 150 DPI typically produces a file between 3 and 8 MB, depending on image complexity. For email submissions where the limit is 25 MB, this usually fits comfortably.

Frequently Asked Questions

Our converter supports JPG/JPEG, PNG, WebP, HEIC, BMP, TIFF, and GIF (static only — animated GIFs use the first frame). HEIC is automatically decoded from Apple devices. For TIFF files, only the first page of a multi-page TIFF is used; split multi-page TIFFs into individual images first if you need all pages.

Converting images to PDF is one of the most practical document workflows — it turns scattered phone photos, screenshots, and scans into a single, shareable, professionally formatted file. Our free converter handles multiple image formats, gives you full control over page size, margins, and quality, and never uploads your files to a server. Try it now: upload your images, arrange them, pick your settings, and download a clean PDF in under 10 seconds.

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