Reduce PDF file size by re-rendering pages at a lower resolution using Canvas.
Essential for emailing large scanned documents that exceed attachment size limits.
Upload your PDF
Click the upload area or drag and drop the large PDF you want to shrink. The entire compression happens on your device.
Choose a quality preset
Pick Low for the smallest possible file, Medium for a balanced result, or High to keep maximum sharpness while still saving space.
Compare and download
Review the before/after size comparison, then download the compressed PDF. Not small enough? Re-run it on a lower preset.
A PDF that is too big is a daily frustration: email bounces back because it exceeds the 25MB Gmail limit, a government or university portal refuses the upload, or a scanned document eats far more storage than it should. The bulk almost always comes from high-resolution scanned images embedded in the file, not the text. Shrinking those images down to a sensible screen resolution can cut the file size by half or more while the document still looks perfectly clean on screen and in print. This compressor does that locally in your browser using Canvas, so your file is never uploaded — important when the document is a contract, medical record, or ID scan. You pick how aggressive to be with a simple Low / Medium / High quality preset, see the before-and-after size side by side, and download the smaller version. There is no account, no watermark, and no daily limit, and your original file is left untouched so you can always re-try at a different quality if you need a different balance of size versus sharpness.
Emailing large documents
Get scanned contracts, reports, and brochures under the 25MB attachment limit so emails actually send.
Web form & portal uploads
Meet the strict file-size caps on government, visa, tax, legal, and HR portals that reject anything too large.
Job & university applications
Compress a scanned transcript, certificate, or portfolio so it fits an application form upload limit.
Cloud storage savings
Reduce the footprint of archived PDFs you rarely print at full resolution, freeing up Drive or Dropbox space.
Faster sharing
Make PDFs quicker to upload, download, and open on slow or mobile connections.
Image-heavy and scanned PDFs typically shrink 40–70% on the Medium preset. Text-only PDFs are already compact, so they compress much less.
No. Text stays crisp at every preset — only embedded image resolution is reduced, which is where the size savings come from.
No. Compression runs entirely in your browser, so the file never leaves your device — safe for sensitive or confidential documents.
PDFs that are mostly text or already optimised have little to squeeze. Try the Low preset; if it is still large, the file is likely already near its minimum size.
Start with Medium — it balances size and clarity for most documents. Use Low when you must hit a strict upload limit, or High when print sharpness matters most.
Remove the password first with our PDF Unlocker tool, then compress the unlocked file here.
No. The tool creates a new, smaller copy and leaves your original exactly as it was, so you can re-try at a different quality any time.
Yes — completely free, no sign-up, no watermark, and no daily compression limit.