Compress PDF to 1MB — Free, Private, No Quality Loss When Possible

1 MB is a common limit for email attachments to official addresses and for portals that take whole reports. Most documents saved from Word reach it without any visible change. A 141-page manual of 1.6 MB came out at 770 KB, looking identical page for page, while turning its pages into images could not get it below 1.4 MB.

Photo-heavy PDFs, such as portfolios and scanned albums, usually fit by recompressing their pictures, and the text stays sharp. Print-ready brochures with pictures in CMYK print colours are the exception for now: those pictures are not recompressed yet, so such a PDF reaches small targets only as page images.

The honest limits. PDFs with a password or with security restrictions are left alone, because compressing them would save them without that protection. A digitally signed PDF can be compressed, but any change to the file makes the signature show as invalid; the tool warns you, and if the signature matters, upload the original. In fillable forms the fonts are kept whole, because whatever someone types later needs every letter. When the target is smaller than the text and fonts alone, the pages do become images. The result then says "pages as images", and the text, links, bookmarks and form fields are not kept; at very small sizes, check that small text is still readable. Pictures in print colours (CMYK) and black-and-white fax-style scans are not recompressed yet, so PDFs made of them reach small targets only as page images. Long documents take longer: a 141-page manual took between 10 and 45 seconds on a laptop. Everything runs in your browser, so the PDF is never uploaded.