A complete workshop for your PDFs.
On your device.
Merge, split, rotate, organize, protect, unlock, compress, and compare. Every tool you need, with no server, no sign-in, no compromise.
Eight tools, one workshop.
Each one crafted for a specific job. Click into any tool — no account, no waiting, no surprises.
Spot every difference.
Pixel by pixel.
Drop two versions of a document. We render both at matched scale, run a per-pixel diff, and surface every changed region as a bounding box. Text-level changes are listed alongside.
- Per-region diffing with adjustable sensitivity
- Bounding boxes overlay the canvas, not screenshots
- Word-level text diffs run in parallel
- Click any region to jump and inspect
Three steps. Every time.
We obsess over the path between your file and the result. The fewer clicks, the better.
Drop your files
Drag, paste, or click to upload. Files stay in your browser's memory — they never touch a server.
Configure the tool
Each tool exposes only the controls that matter. Defaults are tuned, overrides are one click away.
Download the result
We hand back a clean PDF in seconds. No watermarks, no signup, no email gate.
We literally can't see your files.
Perdius runs entirely in your browser. There is no backend that touches your data — the whole toolchain executes inside the page you have open right now.
Your files are processed inside the browser sandbox. We never see the bytes, the metadata, or the filename.
There is no upload step. No proxy. No queue. Open DevTools and you can verify: every operation is local.
Every tool uses the same open-source engines — pdf-lib and pdf.js — that power the world's best PDF software.
Yes. There is no paid tier, no hidden limit, no trial. Every tool is free and unlimited, because everything runs on your device — there is literally no cost to us to process your file.
Drop a file.
See it work.
No signup, no installs, no surprises. The first tool opens in one click.