Developer tools
Lighter PDFs, without uploading them
Images are usually most of a PDF’s weight. This resamples and recompresses them in your browser, and tells you honestly how much was saved.
About this tool
Where the weight in a PDF actually is
A PDF that is tens of megabytes is almost always full of large photos or scanned pages. This opens the PDF in your browser, finds each JPEG and raw image inside it, downsamples anything above the resolution you choose (150 dpi is plenty for screen, 300 for print) and re-encodes it as JPEG at the quality you pick — keeping a new version only when it is actually smaller. Text, fonts and vector graphics are left exactly as they are, so text stays sharp and searchable. PDFs that are mostly text will not shrink much, and the tool says so.
- Free, no sign-up
- Runs in your browser
- Nothing uploaded
Images, resampled
Each image is scaled to the dpi you choose for the size it appears on the page, then recompressed.
Text untouched
Fonts, text and vectors are not re-rendered, so the document stays sharp, selectable and searchable.
Never larger
Every image keeps whichever version is smaller, and if the whole file would not shrink you keep the original.
Step by step
How to compress a PDF
Add your PDF
Drop a PDF — scanned documents and photo-heavy reports shrink the most.
Pick a level
Screen (150 dpi) for sharing, Print (300 dpi) to keep detail, or set quality and dpi yourself.
Download
See the new size and how many images were recompressed, then download.
Get the most out of it
Tips for the best results
- 150 dpi for emailDocuments read on screen look identical at 150 dpi and are far smaller.
- Text-only PDFs stay similarIf there are few images, there is little to compress — that is expected.
- Password-protected PDFsRemove the password first; encrypted PDFs cannot be edited.
- Check before sendingOpen the result and zoom into a photo to confirm the quality suits you.
Keep going
More free developer tools
Questions
Questions about this tool
Everything here runs in your browser — nothing you add is uploaded. More in the general FAQ.
How can I reduce the size of a PDF?
Drop it here and choose Screen or Print. The images inside are downsampled and recompressed in your browser, which is where most of a PDF’s size comes from. The new size and the number of images changed are shown before you download.
Why didn’t my PDF get much smaller?
Because most of it is not images. Text, fonts and vector graphics are already compact and are deliberately left untouched so the document stays sharp and searchable.
Will the text still be selectable?
Yes. Only images are changed; the text layer, links and fonts are kept as they were.
Is there a file size limit?
No fixed limit — the practical ceiling is your device’s memory. Very large PDFs take longer because every image is processed in your browser.
Is my PDF uploaded?
No. The PDF is opened, edited and saved in your browser.