Images en PDF

WikiPlus Images to PDF accepts JPEG, PNG, WebP, GIF, BMP, TIFF, and HEIC files in a single session, and you can mix formats freely within one export. JPEG images are embedded directly into the PDF as JPEG streams with no re-encoding, which means zero quality loss for photographs — the exact compressed JPEG data from the source file is written into the PDF page's image XObject. PNG images are embedded as lossless bitmap streams, preserving transparency (alpha channel) where present. WebP images are decoded and re-encoded as PNG or JPEG depending on whether they contain transparency; WebP with alpha becomes lossless PNG inside the PDF, WebP without alpha becomes JPEG at quality 95 to keep file size manageable. Animated GIFs are converted using their first frame only, since PDF pages are static. HEIC files from iPhone cameras — the default photo format on iOS 11 and later — are decoded by the browser's HEIC decoder and converted to JPEG before PDF insertion; visual quality is maintained at near-lossless settings. BMP and TIFF files go through a canvas-based conversion pass before embedding. You can drop a mixed folder of 20 JPEGs, 5 PNGs, and 3 WebP files into the upload zone and receive a single well-formed PDF with all 28 images in your chosen order. The conversion runs entirely in your browser — the image files never leave your device and are not uploaded to any WikiPlus server. Tip: for scanned document images where text legibility matters, use PNG input rather than JPEG to avoid compounding existing JPEG compression artifacts from the scanning step.

WikiPlus Images to PDF offers four page-sizing modes that cover every standard workflow. The first mode, Fit to image, creates each PDF page at precisely the pixel dimensions of its source image, scaled so that one pixel equals 1/72 of an inch (72 DPI mapping). This preserves the exact aspect ratio of every image and is the best choice when images vary in size or orientation and you want each page to fit its content perfectly. The second mode, US Letter, produces 8.5×11 inch pages (612×792 points) in the orientation you select. Each image is scaled proportionally to fill the page while maintaining its aspect ratio, then centered with equal margins on all sides. The third mode, A4, produces 210×297 mm pages (595×842 points) with the same proportional scaling and centering logic. A4 is the default paper size in Europe, Australia, and most of Asia, so choose it for documents intended for international distribution or printing on A4 printers. The fourth mode, Custom, lets you specify exact page dimensions in millimeters, inches, or points for non-standard applications such as photo books, square-format portfolios, or tabloid-size reports. For batches containing a mix of portrait and landscape images, the Fit to image mode assigns each page the correct orientation for its image, while Letter and A4 modes apply a single fixed orientation to all pages. The live preview panel shows a thumbnail of how each image will be positioned on its page before you commit to the export. Tip: for professional printing, choose Letter or A4 and set your source images to at least 300 DPI equivalent — images below 150 DPI will appear visibly soft when printed at full page size.

WikiPlus Images to PDF is designed to preserve source image quality at the highest fidelity possible for each format. JPEG source images are the most important case: the tool embeds the original JPEG data stream directly into the PDF's image XObject without any intermediate decode-and-reencode step. This is a zero-loss embedding — the pixel values in the embedded image are bit-for-bit identical to the source file, because the JPEG data was never decompressed and recompressed. Any recompression of JPEG data inevitably introduces additional generation loss, so skipping that step entirely is the highest-quality approach. PNG source images with transparency are embedded as lossless PNG streams, preserving every pixel and every alpha value exactly. WebP images are decoded once and re-encoded as either JPEG (for opaque images) at quality 95 or PNG (for images with transparency), introducing at most a small, imperceptible quality change. Resizing only occurs when a fixed page-size mode (Letter, A4, or Custom) is chosen and the image's natural dimensions do not match the page size. In those cases, the tool uses bicubic interpolation, which is the same algorithm used by professional imaging software like Photoshop and GIMP for high-quality upscaling and downscaling. For photography workflows where pixel-perfect accuracy is required, use Fit to image mode with PNG source files and avoid any resizing. The conversion pipeline runs in your browser — no image data is transmitted to any server at any stage — so proprietary product photography, unreleased artwork, and sensitive document scans stay entirely on your device. Tip: compare the file size of your output PDF against the sum of your source image sizes; if the PDF is significantly larger, switch from PNG to JPEG source images for photographic content to achieve a more compact output.

Yes. WikiPlus Images to PDF supports batch uploads of up to 200 images in a single session. You can select multiple files individually through the file browser, drag a group of files from your file manager directly onto the upload zone, or — on Chrome, Edge, and Firefox for desktop — drag an entire folder into the drop area to upload all compatible image files it contains in one operation. The thumbnail grid that appears after upload shows all images in alphabetical filename order by default. This is intentional: files named with numeric suffixes (scan-001.jpg through scan-050.jpg, page-001.png through page-100.png) will appear in the correct document sequence automatically without any manual reordering. For files that do not sort alphabetically into the correct order, drag-and-drop reordering in the thumbnail grid lets you rearrange any image to any position — drag a thumbnail by pressing and holding it (on touch) or clicking and dragging (on desktop) to a new slot, and the remaining thumbnails shift to accommodate it. Remove any image from the batch by clicking the X badge on its thumbnail. The conversion time scales with the total image count and file size. A batch of 100 standard smartphone photos (approximately 3–5 MB each) typically converts in 10–20 seconds on a modern laptop. A batch of 200 such images may approach the browser's memory capacity on lower-end devices — if the tab becomes unresponsive, split the batch into two exports of 100 images each and merge the resulting PDFs with WikiPlus PDF Merge. All processing occurs locally in your browser. Tip: if you need your output PDF to be under a specific file size (such as Gmail's 25 MB attachment limit), process in smaller batches and check the size after each export before adding more images.