Convert JPG and PNG images to PDF

Document upload portals frequently want a PDF, while the only thing you own is a stack of phone photos of the paperwork. Converting them at A4 with sane margins produces something that prints and previews correctly.

Order control is the point: pages are emitted in the exact sequence shown in the workbench, so a marksheet never lands after its certificate.

Scanned ID photos are sensitive; the conversion runs locally in the browser without uploading the selected file.

A portal may require a single PDF even when a document was photographed as separate images. Converting locally collects those photos into one file.

Page dimensions and margins matter for printing and review. Fit-to-image follows the image proportions; a paper size gives each page a consistent layout.

The images stay on your device while the application converts them. Keep the originals in case you need to adjust quality or layout.

This tool exists for PDF documents handled in a hurry: no queue, no account, no upload, and a result you can verify on the spot. The explanation below is the same one we would give a colleague who asked how it works.

A habit worth keeping: before you upload anything produced here, open the result and check three things — the page count, that the first and last pages are the ones you expect, and that the smallest text on the densest page is still readable at 100%. That takes twenty seconds and catches the two failure modes that actually happen: a page quietly lost during a rebuild, and a target that was reached by making a scan unreadable.

PDFs can contain text, images, fonts, forms and document properties. A structural rewrite may reduce a file, but the saving depends on its contents. Keep the original and inspect the output: a rewrite is not guaranteed to remove all identifying metadata, preserve interactive features or make a file safe.

Accepted inputs are JPEG, PNG, WebP, AVIF, HEIC, GIF and BMP images up to 50 MB each. SVG, HTML and other script-bearing formats are refused outright rather than sanitised, because a file that can execute code has no business being re-encoded — and an upload field that accepts one is a security hole rather than a feature. Several files can be queued where the workbench supports it. Batch, page and memory limits apply; check every output.

Each image is decoded and re-encoded as JPEG, with transparency composited onto white, then placed on the selected page size. Images are not automatically downsampled to a DPI target. Orientation depends on the browser decoder; check the finished PDF before submitting. Every image is decoded to pixels, re-encoded as JPEG at the chosen quality and placed on its own PDF page. Transparent pixels are composited onto white. This can introduce JPEG artefacts and does not embed the original JPEG or preserve PNG losslessly. Images are fitted without cropping, but there is no automatic DPI-target downsampling, per-image rotation control, grayscale conversion or OCR. Check the output in a PDF reader. Each image becomes one page sized to the image itself, or to the paper size you select, and page order follows the order you arrange the images in — the commonest failure with this operation elsewhere is a document whose pages are in the order the filesystem happened to sort them. Margins, orientation and page size are all applied before the file is written.