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Compress PDF

Compress PDF

Four precision compression modes, all running locally in your browser. Text stays searchable and copyable in every mode.

Handles large files100% local compressionNo server upload

Privacy

Your documents do not leave your device.

PDFTasker runs in your browser. No uploads. No server detour. No tricks.

Compression modes

  1. 1. Extreme: maximum size reduction — images are resampled aggressively.
  2. 2. High (30%): strong compression while keeping images at reasonable quality.
  3. 3. Medium (50%): balanced reduction with good visual fidelity.
  4. 4. Lossless: trims file structure overhead without touching image quality.
  5. 5. No data leaves your device in any mode.

Load document

Choose source document

Load a document and choose a compression level.

Drop files here, or tap to choose them.

Compression level

Source file

No document selected yet.

Run local compression

Browser workers compress the file on your device. Text remains selectable in all modes.

Compress PDFs locally

Compress PDFs in Your Browser

Shrink the file without turning the whole process into a hassle. Useful when attachment limits or storage space get in the way.

Privacy and trust

Compression without shipping your file out

You should not need to upload a document just to make it smaller. This all runs in your browser.

How to use it

How to shrink a PDF file

  1. 01Add the PDF you want to compress.
  2. 02Choose lossless optimization or maximum compression.
  3. 03Run the compression and let the browser do the work.
  4. 04Download the smaller PDF.

FAQ

Compress PDF FAQ

Do I need to send my document to a server to compress it?

No. PDFTasker runs compression in your browser after the page loads. The file is read from your device, processed locally, and exported as a new PDF. That is useful when the document contains contracts, statements, applications, or client material that should not enter a random upload queue.

What is the difference between lossless optimization and maximum compression?

Lossless optimization tries to reduce file overhead while preserving visible quality. Stronger compression can shrink image-heavy PDFs more, but may change image detail. The right choice depends on the upload limit and whether small text, signatures, stamps, or scans still need to stay readable afterward.

When should I use compression?

Use compression when a portal, email system, or storage limit blocks a file that is otherwise ready to send. Do not compress just to make a number smaller. First remove unneeded pages, then compress, then open the output and check the pages that matter most.

Can every PDF become much smaller?

No. Some PDFs are already optimized, mostly text, or built in a way that leaves little safe room to shrink. Scanned and image-heavy PDFs usually have more reduction potential. If the file barely changes, page cleanup or a different source export may help more than another compression pass.

What should I check after compression?

Open the compressed PDF before sending it. Check small text, signatures, barcodes, QR codes, stamps, tables, and faint scanned pages. Also confirm the file is under the required limit and that you are sending the correct version, not an earlier failed compression attempt or draft.

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