Why are PDFs so large?
Most oversized PDFs are image-heavy: scanned documents, photo reports, and slide exports embed full-resolution images on every page. Email providers often cap attachments at 25 MB and many portals at 10 MB or less, so a 60 MB scan simply will not send.
This tool re-renders each page at a quality level you choose and rebuilds the PDF, which routinely shrinks scanned documents by 70–90%.
How to compress a PDF
Drop a PDF above, choose a quality preset, and press Compress. You will see the before and after sizes so you can decide whether to go stronger or lighter.
Unlike most online converters, FileLark never uploads your files to a server. The conversion runs entirely inside your browser using modern web technology, which means it works offline once the page has loaded, there are no file size queues or daily upload limits, and your images can never be stored, scanned, or leaked — they simply never leave your device.
A note on text
Because compression works by re-rendering pages as images, selectable text becomes part of the page image in the output file. For scans and photo-heavy documents this is irrelevant (they are images already) — but if you need selectable text and a smaller file, try splitting the document or removing unneeded pages instead.