Image to PDF

What is an image file?

“Image file” covers a long list of formats that all store visual content but use very different encodings underneath. JPG and PNG are the web’s classic pair — lossy photographic and lossless graphical. WebP and AVIF are the modern successors, both significantly smaller at the same visual quality. HEIC is what iPhones save by default. TIFF is the standard for scanners, microscopes and archives. GIF, BMP, PSD and SVG round out the long tail of formats people still need to deal with. Most operating systems show them all as thumbnails, but combining them into a single shareable file is another matter.

What is a PDF?

A PDF (Portable Document Format) is a self-contained document file that bundles text, fonts, images, vector graphics and page layout into a single file that looks identical everywhere it opens. For a folder of images, a PDF is the cleanest way to hand someone an ordered, paginated package — one attachment instead of forty, one filename, in the sequence you decide.

Why convert images to PDF?

The most common reason is a single upload field that only accepts PDF. Job-application portals, expense systems, visa applications, school admission portals, insurance claims and a long tail of bureaucratic web forms reject image uploads outright. Wrapping your images in a PDF gets them through.

The second is bundling mixed-format batches. A real-life folder of receipts might be HEIC from a phone, JPG from a scanner app, PNG from a screenshot, WebP from a download. Combining them with the OS print-to-PDF workflow means opening each one in turn and fighting page ordering. One drop here gets the job done.

The third is archival. A PDF travels better than a folder of images: it preserves order, fits one filename, opens reliably on every device, and survives the next OS upgrade without anyone having to re-establish “which app opens HEIC again”.

The fourth is printing. Sending a PDF to a printer always respects pagination; sending forty image files to a printer can produce surprising results depending on the print dialog.

If you arrived searching for a generic convert to PDF option, a way to convert image to PDF without installing anything, or simply an image to PDF converter that handles whatever mix of formats you happen to have, this is the right page. The single-format dedicated tools (JPG to PDF, PNG to PDF, WebP to PDF, HEIC to PDF, TIFF to PDF and the rest) exist as faster routes when every image you have is the same format; this page is the mixed-format catch-all that handles any combination in one batch.

How to convert images to PDF on ToolJutsu

1. Drop your images onto the dropzone, or click to browse. Any combination of supported formats is fine in one batch.
2. Reorder the thumbnail list by dragging. The order shown is the order the PDF will use, one image per page.
3. Pick a page size — fit-to-image keeps each page exactly the shape of its input image; A4 or US Letter centres each image on a standard page with margins, preserving aspect ratio.
4. Click Convert to PDF. JPG and PNG inputs are embedded directly via pdf-lib. WebP, AVIF, HEIC, TIFF, PSD, GIF, BMP and SVG are decoded by Phase 16’s shared image decoder, re-encoded as JPG (with any alpha flattened to white), and then embedded. The result downloads automatically.

Quality tips for image to PDF

For photographs, the JPG re-encode path used by non-PNG/JPG inputs is what you want anyway — JPG is the right format for photographic content. Default quality (92%) is visually indistinguishable from the source.

For diagrams, screenshots and line art, use PNG inputs where possible. PNG is embedded byte-for-byte, so the crisp text and sharp edges survive without going through a lossy encoder.

For mixed batches, fit-to-image is usually the cleanest result because no image gets letterboxed onto a much larger page. Pick A4 or Letter only when uniform page size matters (printing, upload portals that expect standard paper).

For large batches of HEIC, AVIF or TIFF, decoding is CPU-intensive and runs in your browser. A modern laptop handles 50+ images comfortably; an older phone may want smaller batches.

Privacy

Every step runs in JavaScript inside your browser tab. The image files you drop never travel across a network. The decoder libraries (pdf-lib, heic2any, UTIF, the PSD reader and so on) load once from this site and cache; on subsequent visits the converter works offline. There is no server-side processing and no analytics on your image contents. You can confirm this in your browser’s Network panel.

Compatibility notes

The output is a standard PDF 1.7 file that opens in every modern PDF reader — Adobe Acrobat, Apple Preview, the built-in viewers in Chrome, Edge, Firefox and Safari, and the mobile readers on iOS and Android. If your batch is all one format, the dedicated single-format tools (JPG to PDF, PNG to PDF, WebP to PDF, HEIC to PDF, TIFF to PDF) keep more of the original encoding intact where they can. If you want to combine the resulting PDF with other PDFs afterwards, use the PDF Merger tool.