PF 3
LocalKit
Privacy-first PDF, image, video and audio tools that run entirely in the browser. No uploads, no servers.
AstroReactWebAssemblyFFmpeg.wasmTailwind CSS
What it is
A toolbox for merging, splitting, compressing and watermarking PDFs, converting, resizing and cropping images, background removal, and trimming and converting video and audio. Every tool runs client-side, so files never leave the device.
The hard part
Doing server-grade work in a tab: FFmpeg compiled to WebAssembly for video and audio, pdf-lib and PDF.js for documents, and an ONNX model for on-device background removal, all inside an installable PWA built from static Astro pages with React islands.
LIGHTHOUSE · MOBILE · MEDIAN OF 35 OCT 2026
| PERF | A11Y | BP | SEO |
|---|---|---|---|
| 93▼2 | 87 | 100 | 100 |