> ZeroCloudPDF is a free, privacy-first PDF and image tool suite. All processing runs entirely in the browser using JavaScript. No files are uploaded to any server. No account is required for any tool.

# ZeroCloudPDF

## Tools

- [Compress PDF](https://zerocloudpdf.com/compress-pdf): Reduce PDF file size in the browser. Three quality presets: Smallest, Balanced, Best Quality. No upload.
- [Merge PDF](https://zerocloudpdf.com/merge-pdf): Combine multiple PDF files into one. Runs in the browser. No upload.
- [Image to PDF](https://zerocloudpdf.com/image-to-pdf): Convert JPEG, PNG, WEBP, HEIC, GIF, BMP, TIFF and SVG images to PDF. No upload.
- [JPG to PDF](https://zerocloudpdf.com/jpg-to-pdf): Convert JPG photos to PDF. Runs in the browser. No upload.
- [PNG to PDF](https://zerocloudpdf.com/png-to-pdf): Convert PNG images to PDF. Preserves transparency. No upload.
- [HEIC to PDF](https://zerocloudpdf.com/heic-to-pdf): Convert iPhone HEIC photos to PDF. Works in Safari on iOS. No upload.
- [Word to PDF](https://zerocloudpdf.com/word-to-pdf): Convert DOCX files to PDF. Text mode or image mode. No upload.
- [PDF to JPG](https://zerocloudpdf.com/pdf-to-jpg): Export PDF pages as JPG images. Runs in the browser. No upload.
- [PDF to PNG](https://zerocloudpdf.com/pdf-to-png): Export PDF pages as PNG images with transparent background. No upload.
- [Compress PDF on iPhone](https://zerocloudpdf.com/compress-pdf-iphone): Guide and tool for compressing PDFs on iPhone without an app.

## Content

- [Blog](https://zerocloudpdf.com/blog): Articles on browser-based PDF processing and online privacy.
- [How Browser-Based PDF Conversion Works](https://zerocloudpdf.com/blog-how-browser-pdf-conversion-works): Technical explanation of the FileReader API, pdf-lib and mammoth.js pipeline.
- [The Hidden Privacy Risks of Free Online PDF Tools](https://zerocloudpdf.com/blog-hidden-privacy-risks-pdf-tools): What happens to your files when you upload them to server-based PDF tools.
- [About ZeroCloudPDF](https://zerocloudpdf.com/about): Background on the project and engineering approach.
- [FAQ](https://zerocloudpdf.com/faq): Common questions about privacy, file handling and tool compatibility.

## Privacy model

All PDF and image operations use pdf-lib, jsPDF, pdf.js, mammoth.js and html2canvas running locally in the browser. Files are read using the FileReader API and processed in memory. No data leaves the device at any point. The vault feature stores user-uploaded files in Firebase with per-user quota enforcement and is the only part of the product that involves a server.