Most "free" converters work by uploading your file to a server, processing it there, then sending it back —
which means a copy of your file (photos, PDFs, IDs, whatever it is) briefly or permanently sits on someone else's
machine. Lotus Convert doesn't do that. Every tool here runs using your browser's own built-in
tools — the same engine that draws web pages and plays videos — to decode, transform, and re-encode your file
directly on your computer or phone. The data never crosses the network, so there's nothing to intercept, log,
or leak. You can even disconnect your Wi-Fi after the page loads and every tool will keep working.
Concretely: image conversion uses your browser's Canvas API to decode the picture and re-export it in a new
format. PDF merging and compressing use a JavaScript PDF library running locally in a background thread.
PDF-to-image rendering uses your browser's own PDF rendering engine. Background removal downloads a small
machine-learning model once (so it can run offline afterward) and runs it locally too. In every case, the
only network activity is fetching the tool's code (and ads) — your actual file contents are never part of any
request this site makes.
Runs entirely on your device
Shrink PDFs without the upload.
Drop in a PDF to strip unused data and repackage it more efficiently. Best results on PDFs with a lot of embedded fonts or metadata — heavily image-based PDFs will shrink less.
Drop a PDF here
.pdf — one file at a time
No PDF loaded yet — drop one above to compress it.
How PDF compression works here
Compression repackages the PDF's internal structure — removing redundant data and consolidating object
streams — using a library that runs locally in your browser. It works best on text- and font-heavy PDFs;
PDFs that are mostly scanned images will shrink less since the images themselves aren't re-compressed.
Why didn't my file get smaller?
Some PDFs are already tightly packed, especially if they were exported from a modern tool. You'll still get a valid, re-optimized file back.
Will this reduce image quality inside the PDF?
No — this tool restructures the file rather than re-compressing embedded images, so visual quality is unaffected.
Can I compress a PDF for email without uploading it?
Yes — the whole process runs locally in your browser, so the PDF never leaves your device while it's being shrunk down.
No uploads
Every tool here runs with your browser's own engine. Files never leave your device.
No limits
No file count cap, no watermark, no account required.
No install
Works in any modern browser, on desktop or mobile.