Images
Pictures at screen resolution
Scans and photos are often stored at 300 to 600 dpi. Bringing them down to 150 dpi looks the same on a screen and removes most of the weight.
Compress PDF
Make PDF files smaller online, free. Pick how small; pages, text and links stay as they are.
- Free to use
- No file stored beyond 1 hour
- Encrypted over TLS 1.2/1.3
- No watermarks
Drag and drop your files here or click to upload.
Maximum file size is 1GB
Like RunConvert? Set us as a preferred source on Google.
Add to Preferred SourcesHow to compress a PDF
Three steps, in your browser. Nothing to install.
- 01
Add your PDFs
Drop up to 20 PDF files, or paste a link.
- 02
Pick how small
Every PDF starts on Balanced. Open a PDF's settings to make it smaller or keep print quality, for one PDF or all of them.
- 03
Compress and download
Same pages, same text, smaller file. If a PDF can't get smaller, you get your original back.
Which setting should I pick?
Balanced suits nearly every PDF you'll read on a screen. Keep Best quality for anything you'll print.
- Smallest fileImages at 72 dpi. Fine on screen; for email and upload limits.Email · forms
- BalancedDefaultImages at 150 dpi. Sharp on screen, much smaller. Right for most PDFs.Most PDFs
- Best qualityImages at 300 dpi. Print quality with a lighter cut.Printing
How the PDF gets smaller
Most of a big PDF's weight is pictures: scans, photos and charts. The text itself is tiny.
Fonts and duplicates
Only what's used, stored once
Fonts keep only the letters that appear, and an image used on many pages, like a logo, is stored once. Text stays sharp, selectable and searchable.
- Format
- Kept
- Pages, text, links
- Files
- Up to 20, 1 GB each
- Output
- PDF, never bigger
25 MB
Fit email and upload limits
Gmail attachments stop at 25 MB, and many portals take far less. Start with Balanced; if it's still too big, pick Smallest file in the PDF's settings.
More free PDF tools
Frequently asked questions
Common questions about compressing PDFs with RunConvert.
Yes. It's free, without a watermark and without signing up.
Yes. Text, fonts and vector drawings aren't turned into pictures, so they stay sharp and searchable at every setting.
A PDF that's mostly text, or already optimised, has little to remove. You get your original back rather than a bigger file.
No. Remove the password in your PDF reader first, then compress it.
Up to 20 at a time, up to 1 GB each.
They are encrypted in transit, used only for this job, and deleted automatically after a few hours.
Ready to compress your PDF?
Free, no sign-up, no watermark.