Privacy-First Toolkit

PDFKit

High-performance file tools powered by Rust and WebAssembly. Every operation stays on-device.

Security Promise

All processing happens in your browser. Your files never leave your device.

Optimize and transform images entirely in your browser.

Reduce file size with quality control.

Set width and height precisely.

Switch between JPEG, PNG, and WEBP.

Cut exact pixel regions.

Core PDF workflows with no server upload.

Combine multiple PDFs into one file.

Split by page ranges.

Pick pages into a new PDF.

Apply document compression.

General file utilities for structured and archive data.

Convert rows into JSON objects.

Bundle multiple files.

Unpack archive entries.

Developer-focused text transformations and comparison tools.

Compare two texts with unified diff output.

Prettify and validate JSON instantly.

Count words, lines, chars, and paragraphs.