UnlimitedPDF

Compress · free online · never uploaded

Compress PDF online free — no upload, no size limit

Shrink a large PDF in your browser. Pick Low, Recommended, or High compression and download instantly. No account, no watermark, no file size cap.

  • Never uploaded
  • No size limit
  • No account
  • No watermark
Compression level

Why people use Compress PDF without uploading

Email, government portals, and job boards still cap attachments around 5–10 MB. A scanned contract or a slide deck full of photos blows past that. Most “compress PDF” sites upload the file, store it, then shrink it on a server. That is convenient for a flyer and a bad idea for a passport scan, a payroll PDF, or anything covered by a confidentiality clause. UnlimitedPDF recompresses the file in this tab. We never receive it.

How to use Compress PDF on this page

  1. Drop one or more PDFs. They are read with the browser File API and stay in memory on this device.
  2. Choose Low (re-encode images, keep text sharp), Recommended (stronger image compression, text still selectable), or High (flatten each page to a JPEG. Smallest file. Text is no longer selectable).
  3. Download. Several outputs zip into one file. Ads sit next to the download — they do not block it.

What this tool keeps — and what it does not

Low and Recommended keep selectable text, vector lines, and form structure as far as the original file allows. They rebuild the PDF with pdf-lib after shrinking embedded images. High is a last resort for portals that still refuse the size: each page is rasterized, so highlighting and copying text will not work on the result.

Limits, failed files, and honest tradeoffs

There is no file-size cap or daily quota on our side. The limit is your browser’s RAM. A 200-page scan may fail on a phone and succeed on a desktop. If it fails, split the PDF first, compress the pieces, then merge. Corrupted PDFs are rejected with a plain error — we cannot repair a broken xref table in the browser.

Related tools

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  • PDF to Word — PDF to Word converter. Free .docx, no sign-up, no upload.
  • JPG to PDF — Convert JPG, PNG, WebP to PDF. Free, no sign-up.

PDF tools FAQ

How do I compress a PDF for email?
Drop the file here, keep Recommended, and download. On a 10-page 300 ppi test scan, Recommended went from 18.9 MB to 2.68 MB. Mail servers often count the encoded message, which is about a third larger than the file, so aim for roughly three quarters of the stated limit.
Does High compression keep text selectable?
No. Low and Recommended re-encode the embedded images and keep the text layer. High redraws each page as a single image, so text, links, and form fields stop working. Use it for scans, or when Recommended is still too large.
Why does the result say “Already optimized”?
The compressed version was not smaller, so you get the original back. That is normal for PDFs exported from Word or Google Docs: a 12-page text report in our tests shrank by 11% on Recommended, and High returned the original.
Is there a file size limit?
Not on our side. The file is processed in your browser, so the practical limit is your device’s memory. Very large scans are more reliable on a laptop or desktop than on a phone.