Convert images between PNG, JPG, WebP. Combine multiple images into a PDF in upload order. Batch convert many at once. Nothing leaves your browser.
🖼 Convert Image
📄 Images to PDF
⚡ Batch Convert
🔗 Merge PDFs
Convert a single image
🖼️
Drop image here or click to browse
PNG · JPG · WebP · GIF · BMP supported
Preview
Original
Converted
Combine images into a PDF in upload order
📄
Drop images here or click to browse
Multiple files OK · Each image = one page · Reorder with arrows
Batch convert multiple images at once
⚡
Drop multiple images or click to browse
Select as many as you want — all converted instantly
// how it works
Upload your PDF files in the order you want them merged. Use the ↑↓ arrows to reorder. Click Merge PDFs — the combined file downloads instantly. Everything happens in your browser, nothing is uploaded.
How it works: Your PDFs are opened in a new tab in the order you set.
In the print dialog, choose Save as PDF — this creates your merged file.
Works entirely in your browser, no files uploaded.
How it works: Upload your PDF files, reorder them with the arrows, then click Merge. The files are combined entirely in your browser using PDF-lib — nothing is uploaded to any server.
Merge multiple PDF files into one
🔗
Drop PDF files here or click to browse
Multiple PDFs OK · Merged in upload order · Use arrows to reorder
What is Muffin's Image & PDF Converter?
Muffin's Image & PDF Converter is a free, browser-based tool that handles four common file tasks in one place — converting images between formats, combining images into a PDF, batch converting multiple images at once, and merging multiple PDF files into a single document. Everything runs entirely in your browser. No file is ever uploaded to a server, making it safe for sensitive screenshots, research figures, lecture slides, and confidential documents.
What can you do with this tool?
🖼 Convert Images
Convert PNG to JPG, JPG to PNG, or any image to WebP. Choose quality level to control file size. See a side-by-side preview before downloading.
📄 Images to PDF
Combine multiple images into a single PDF. Each image becomes one page. Reorder with arrows before creating. Supports A4, Letter, and fit-to-image page sizes.
⚡ Batch Convert
Drop dozens of images at once and convert them all to the same format in one click. Each converted file gets its own download link.
🔗 Merge PDFs
Combine multiple PDF files into one. Upload your PDFs, reorder with arrows, and download the merged result. Perfect for combining lecture notes, reports, or research papers.
How to merge multiple PDFs into one
Click the Merge PDFs tab, drop your PDF files, and they appear as a numbered list. Use the ↑↓ arrows to set the order you want — the first file in the list becomes the first pages of the merged document. Give your output a filename and click Merge. The combined PDF downloads directly to your device.
This is useful for combining lecture slides into one file, merging chapters of a report, joining multiple research papers for reading offline, or combining scanned documents. There is no limit on how many PDFs you can merge — the only constraint is your browser's memory.
Why convert PNG to JPG or WebP?
PNG files are lossless and large — great for screenshots and graphics with transparent backgrounds. JPG files are compressed and much smaller — better for photographs and images you want to share quickly. WebP is a modern format that gives you smaller file sizes than both PNG and JPG at the same visual quality, making it ideal for web use.
Muffin lets you control the quality level when converting to JPG or WebP — from 60% (smallest file) to 95% (highest quality). You can see the original and converted file size comparison in the preview before downloading.
100% private — nothing is uploaded
Image and PDF files often contain sensitive content — confidential documents, personal photos, proprietary diagrams, or unpublished research. Most online converters send your files to a remote server for processing. Muffin processes everything locally in your browser. Your files are read into browser memory, converted using the Canvas API and PDF-lib, and downloaded — all without leaving your device. You can disconnect from the internet after the page loads and the tool will still work.