Merge PNG to PDF

How to Merge PNG to PDF Online

1. Upload Your PNG Files: Drag and drop or click "+ Add Files" to select multiple PNG images. Reorder pages by dragging tiles before merging — the final PDF follows the tile sequence top-to-bottom.
2. Pick Combine Mode and Paper Size: Default is "Single PDF" with A4 portrait. Switch "Combine?" to "Individual PDFs" for one PDF per PNG. Open the "Paper size" dropdown for Original (each page sized to its image), LETTER (8.5x11"), LEGAL, TABLOID, A3, A4, ISO B4/B5, EXECUTIVE, ARCH A/B, or SCREEN_SIZE. Toggle "Page layout" between Portrait and Landscape.
3. Set Image Placement, Alignment, and Margin (Optional): "Image placement" controls fit — "Cover" fills the page edge-to-edge (crops if aspect mismatches), "Contained" (default) fits the image inside the margin box without cropping. "Image alignment" picks Top, Center (default), or Bottom inside that box. "Margin" offers No margin (0"), Narrow (0.5", default), Moderate (0.75x1"), Normal (1"), or Large (2x1").
4. Tune Quality, Transparency, and Merge: "Image Compression" slider (1-100, default 75) sets the JPEG quality used when re-encoding embedded images. "Image Transparency" keeps PNG alpha "Unchanged" (default) or "Removed" (composites against white — required for most print workflows). The "Compression Type" preset chooses Ghostscript profile: Screen, Ebook, Default, Prepress, or Printer. Click "Merge" — files process on our servers, no sign-up, no watermark.

Why Merge PNG to PDF?

PNG (ISO/IEC 15948:2004) is the dominant lossless raster format for screenshots, UI mockups, scanned receipts, and any image where pixel-perfect fidelity matters. PDF (ISO 32000-2:2020) is the universal portable document container — every modern browser, every email client, every operating system renders PDFs identically. Merging a stack of PNGs into one PDF turns a folder of loose screenshots into a single, paginated, printable, archivable document.

• Bug reports and QA evidence — combine 8-15 screenshots of a reproduction trail into one numbered PDF that fits a Jira or Linear attachment slot, instead of zipping a folder reviewers have to extract.
• Design mockup decks for client review — merge Figma/Sketch PNG exports into a sequenced PDF so the client sees screens in the intended order without scrolling a Drive folder.
• Scanned documents from phone scanner apps — apps like Adobe Scan and Microsoft Lens save individual pages as PNG; merging restores them to a single multi-page document for signing or filing.
• Receipts and expense reports — collate phone screenshots of mobile receipts into one PDF for Expensify, Concur, or your accountant — most expense systems prefer one PDF per report over many image attachments.
• Photo booklets and portfolios — chain product photos, event galleries, or portfolio shots into a paginated PDF that opens identically on any device — no Pinterest-style reflow.
• Compliance and archival — PDF/A is an ISO-standard archival subset; converting screenshots and scans to PDF is the first step toward long-term storage that won't break when image viewers change.

PNG vs PDF — Format Comparison

Compression Type Preset Guide

The "Compression Type" presets map to Ghostscript distillation profiles. They affect downsampling, color conversion, and font embedding policy.

For most screenshot workflows, leave it at Screen and rely on the Image Quality slider (default 75) — Prepress only matters when you're sending the PDF to a print shop.

Frequently Asked Questions

Will my PNG transparency be preserved in the PDF?

PDF has supported transparency since version 1.4 (2001), so the alpha channel is technically preserved when "Image Transparency" is left at "Unchanged." However, most PDF viewers render the page background as white, so a transparent PNG will visually appear over a white page. If you need the transparent areas to composite cleanly without anti-aliasing halos, set "Image Transparency" to "Removed" — that flattens against white before embedding, which avoids edge artifacts in CMYK or print pipelines.

Why is my merged PDF much larger than the sum of the PNG files?

PDFs add overhead per page (page object, font references, metadata) and re-encode the image stream when the Ghostscript profile downsamples. PNGs that were already DEFLATE-compressed sometimes get re-encoded as JPEG inside the PDF (lossy), which can grow OR shrink the file depending on the original. Drop the "Image Compression" slider toward 60-70 and pick the "Screen" Compression Type to get the smallest result. If size matters, re-run the output through a PDF compressor.

Can I keep each PNG at its original pixel dimensions instead of fitting to A4?

Yes. Set "Paper size" to "Original" — each PDF page is sized to match the source PNG's pixel dimensions (converted to PDF points at 72 dpi). This is the right choice for dashboard screenshots, terminal captures, and anything where fitting to A4 would scale text into illegibility.

What's the difference between Cover and Contained image placement?

Contained (the default) fits the entire image inside the margin box, leaving white space around shorter sides — nothing is cropped. Cover scales the image to fill the entire page including margins, cropping whichever dimension overshoots. Use Contained for screenshots where every pixel matters; use Cover with No margin for full-bleed photo books or portfolio pages.

Can I merge PNG with JPG, HEIC, or other image formats in the same PDF?

Not on this page directly — this tool accepts PNG only. For mixed-format batches, use Merge Image to PDF, which accepts PNG, JPG, HEIC, BMP, GIF, and other image types in one drop. Alternatively, convert each non-PNG to PNG first, then merge.

How do I make the PDF searchable (OCR text layer) for scanned screenshots?

This tool embeds PNG images as raster — there's no OCR pass, so text inside screenshots is not selectable or searchable. For OCR you'd need a separate post-processing step with a tool like Adobe Acrobat, Tesseract, or ABBYY FineReader. If your scans came from a scanner app, many (Adobe Scan, Microsoft Lens, Google Drive scans) save directly to OCR'd PDF and skip the PNG-to-PDF step.

Can I merge thousands of PNGs at once or is there a cap?

xconvert merges on our servers, so the practical cap is upload size and connection speed and the browser's file-handle limit. A typical desktop browser handles 100-300 medium-resolution screenshots without issue; for larger batches split them into chunks of ~100, merge each chunk to a sub-PDF, then combine the sub-PDFs with Merge PDF.

Is "Single PDF" the same as combining? What does "Individual PDFs" do?

"Single PDF" (default) places every uploaded PNG into one combined PDF in the order of your tiles — the merge use case. "Individual PDFs" produces one separate PDF per input PNG, each with the same page-size, margin, and quality settings. Pick Individual PDFs when you want batch PNG-to-PDF conversion (each image becoming a one-page PDF) without combining; for the reverse single-file flow see Convert PNG to PDF.

Are my files uploaded to a server?

Files are processed on our servers session for the merge — they aren't kept on a server after your session ends, and there's no sign-up or watermark. For sensitive screenshots (internal dashboards, redacted documents) this is meaningfully different from cloud-only converters that retain copies for analytics or reprocessing.