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Compress PDF

Compress one PDF or a whole batch to reduce file size — set the DPI and image quality, see exactly how much you saved on each file, and download. Free, instant and 100% private: everything runs in your browser and nothing is uploaded.

Level DPI Image quality %
Drop PDF files here, or click Add PDFs
One file or many — compressed in your browser, nothing uploaded
Each page is re-rendered as an optimised image and rebuilt into a smaller PDF — the proven way to shrink scanned and image-heavy PDFs. Lower DPI/quality = smaller files. Note: text becomes part of the image (no longer selectable). 100% private — nothing is uploaded.

About compressing PDF files

Compressing a PDF makes it smaller so it is easier to email, upload or store. This tool re-renders each page as an optimised image and rebuilds a new, lighter PDF — the most reliable way to shrink scanned and image-heavy documents. Unlike cloud compressors, it does all the work inside your browser, so your files never leave your device. Image-heavy and scanned PDFs compress far more than text-only PDFs.

How Compress PDF works

How to compress a PDF

  1. Add your PDF(s). Drop one file or many onto the box, or click Add PDFs.
  2. Choose how much to compress. Pick a level — Strong, Recommended or Light — or set the exact DPI and image quality yourself.
  3. Compress and download. Each file shows its new size and the percentage saved; download them one by one or all together as a ZIP.

Single file or batch

Compress one PDF or a whole batch at once. Every file appears as a card with a thumbnail, its page count and the before-and-after size, so you can see exactly how much space you saved.

Adjustable quality — DPI & image quality

Two settings control the result. DPI sets how sharply each page is rendered (lower DPI = smaller file), and image quality sets the JPEG quality of the rendered pages. The presets are good starting points — Strong (96 DPI / 50%), Recommended (144 DPI / 72%) and Light (200 DPI / 85%) — and changing either value re-compresses the queue instantly so you can dial in the perfect balance.

Which PDFs shrink the most?

Scanned documents and image-heavy PDFs compress dramatically — often by 70–90%. Text-only PDFs are already small and may shrink little. Because pages are re-rendered as images, the output is no longer selectable text, so keep the original if you need that.

Private by design

Cloud tools upload your PDF to a server and keep it for a while before deleting it. This compressor is different: it works entirely in your browser, so your files never leave your device, there is nothing to delete from a server, and it even works offline. No sign-up, no limits, completely free.

Common uses

  • Shrink a PDF to fit an email attachment limit
  • Batch-compress many PDFs in one go
  • Reduce the size of scanned documents
  • Make image-heavy PDFs upload and load faster
  • Save storage space on large PDF archives
  • Compress PDFs privately, without uploading them anywhere
  • Lower bandwidth when sharing PDFs
  • Fit a PDF under a portal or form upload size cap

Frequently asked questions

How do I compress a PDF?
Add your PDF, choose a level (or set DPI and quality), and click Compress — each file shows the size saved before you download it.
Can I compress several PDFs at once?
Yes. Add as many as you like; they compress in a queue and Download All saves them together as a ZIP.
Are my files uploaded to a server?
No. Everything happens in your browser, so your PDFs never leave your device — and there is nothing stored on any server to delete.
Will the text still be selectable afterwards?
No — this method flattens each page to an image, so text becomes part of the image. Keep the original if you need selectable text.
Which PDFs compress the most?
Scanned and image-heavy PDFs shrink a lot (often 70–90%). Text-only PDFs are already small and may not shrink much.
What DPI and quality should I choose?
Recommended (144 DPI / 72%) suits most files. Lower both for a smaller file, raise them for sharper pages.
Why didn't my PDF get much smaller?
It may already be optimised or be text-only. Try the Strong level, or accept that an efficient PDF has little to remove.
Is it free and are there limits?
Yes — completely free, no sign-up, and no limit on the number of files.
Does it work offline?
Yes — once the page has loaded, compression runs without an internet connection.
Is there a file size limit?
Only your device's memory — very large PDFs use more RAM while processing.