Compress PDFs in your browser

Sending a document to a compression server means trusting someone else with the file, the logs, and the deletion policy. PDFTasker keeps compression on your device, then asks you to inspect the result instead of chasing the smallest possible number. Compression matters most at the moment a portal rejects your upload: a job application capped at 5 MB, a government form capped at 2 MB, an email attachment bouncing at 25 MB. The fix is rarely complicated — most oversized PDFs are heavy because of scanned pages or embedded photos, not text. That is why the tool offers two modes instead of one slider. Lossless optimization rebuilds the file structure and strips redundant data without touching image quality; it is the safe default for contracts and anything with a signature. Maximum compression also re-encodes images, which shrinks scans dramatically but can soften fine detail. The honest rule: pick the gentler mode first, check the size, and only escalate if you must. After either mode, open the output and zoom in on the smallest text, any stamps, and any QR codes before you send it. Your original file is never modified — you always get a new copy to compare.