PDF · Compress

Shrink PDFs. Up to 90% off.

Drop your PDF, pick a quality level, download a file that's a fraction of the original size — entirely in your browser, with zero uploads.

Your file never leaves your device — compression runs locally in WebAssembly.
Four quality levels — Screen, Ebook, Printer, Prepress. You choose the trade-off.
Live size preview before downloading — see exactly how much you save.

Compress PDF now How it works

★★★★★ 4.8 / 5 · 11,204 reviews Zero uploads · Zero watermark

compress.kindatool report.pdf · 12.4 MB ebook quality

Before

12.4 MB

→

−85%

After

1.8 MB

Original

12.4 MB

Compressed

1.8 MB

Saved

−85%

quality ebook

What people say

From students to enterprises — everyone compresses here.

★★★★★

I had a 40 MB scan that email kept rejecting. Two seconds later it was 3 MB and sent. No upload, no account. Incredible.

Marcus P.

★★★★★

The ebook quality level is perfect for sharing reports. Readable on screen, small enough to email. I use this daily.

Sophie R.

★★★★★

Compressed a 200-page architectural PDF from 180 MB down to 8 MB. The printer quality setting kept all the detail.

Thomas L.

★★★★★

The compression runs locally — nothing leaves the browser. I can't send legal documents to external servers, so this is the one I use.

Grace F.

★★★★★

The live size preview shows the trade-off before you commit. Never had that in any other PDF compressor.

Ali K.

★★★★★

I had a 40 MB scan that email kept rejecting. Two seconds later it was 3 MB and sent. No upload, no account. Incredible.

Marcus P.

★★★★★

The ebook quality level is perfect for sharing reports. Readable on screen, small enough to email. I use this daily.

Sophie R.

★★★★★

Compressed a 200-page architectural PDF from 180 MB down to 8 MB. The printer quality setting kept all the detail.

Thomas L.

How it works

Compress in three steps

Drop, choose quality, download. The whole process takes under 5 seconds.

STEP 01

Drop your PDF

Drag your PDF onto the upload zone. Large files with images or scans are supported without size limits.

STEP 02

Pick a quality level

Screen, Ebook, Printer or Prepress — balance file size against visual quality. A live preview shows the size reduction.

Screen (smallest)

Ebook

−85%

Printer

Prepress (largest)

STEP 03

Download compressed PDF

Click Compress. Your browser processes everything locally and instantly triggers the download.

compressed.pdf1.8 MB · −85%

Screen

1.1 MB

Ebook

1.8 MB

Printer

4.2 MB

Original

12.4 MB

Quality levels

Four levels. You pick the trade-off.

Screen is the smallest — ideal for web viewing and email. Printer keeps sharp images for professional printing. Ebook sits in the sweet spot for most use cases.

01
Screen — smallest file72 DPI images. Best for on-screen reading and web embeds. Not for printing.
02
Ebook — the sweet spot150 DPI images. Great for email, tablets, and everyday sharing. Up to 85% reduction.
03
Printer — print quality300 DPI images. Suitable for office printing with moderate size reduction.

💻

No server · No upload

Privacy

Your PDF never touches a server

Compression runs 100% inside your browser using WebAssembly. There is no server receiving your file — not even temporarily. Nothing is sent to a server during the process.

01
Zero network requestsThe compression algorithm runs on your CPU, inside your browser tab.
02
Works fully offlineOnce the page is loaded you can disconnect — compression still works.
03
No account, no trackingNo sign-up, no analytics on your files, no data retained anywhere.

FAQ

Common questions

Does kindatool upload my PDF to a server?

No. Compression runs entirely in your browser using WebAssembly. Your file never leaves your device — there is no server to send it to.

What does each quality level mean?

Screen (72 DPI) is for on-screen reading only. Ebook (150 DPI) is for everyday sharing — the best balance. Printer (300 DPI) produces print-ready output with moderate size reduction. Prepress is near-lossless for commercial printing.

How much can I reduce my PDF?

It depends on the content. Image-heavy PDFs can shrink by 80–90% on Screen level. PDFs made of text and vector graphics have less headroom since text is already compact.

Will compression change the visual quality?

Only for images embedded in the PDF — they are re-encoded at the chosen DPI. Text, vector graphics, and fonts are not affected and remain perfectly sharp at any zoom level.

What is the maximum file size?

Only your available RAM. Files up to several hundred megabytes work on any modern laptop. Very large files may take a few extra seconds to process.

Shrink PDFs. Up to 90% off.

Trusted by 740K people · 1.8M PDFs compressed every month

From students to enterprises — everyone compresses here.

Compress in three steps

Drop your PDF

Pick a quality level

Download compressed PDF

Four levels. You pick the trade-off.

Your PDF never touches a server

Common questions

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Ready to compress your PDF?