Private, browser-based PDF compressor

Compress PDF files. Keep your work private.

Reduce PDF file size directly in your browser—free, fast, and without uploading your document to a processing server.

Drag & drop your PDF file here

or click to browse from your device

Supports files up to 100MB

document.pdf

0.00 MB

Select Compression Preset

Lossless Fastest

Optimizes the PDF structure without intentionally reducing image quality.

Est. 5% – 15% savings

Balanced Recommended

Reduces image dimensions and quality to balance readability with a smaller file.

Est. 30% – 60% savings

Max Compression Smallest

Aggressively compresses images (50% quality, low DPI). Ideal for sending via email or slow networks.

Est. 50% – 85% savings

0%

Compressing PDF...

Downsampling and compressing pages. Please keep this tab open.

Compression Complete!

Your compressed PDF is ready for download.

Original Size 12.5 MB

Compressed Size 4.2 MB

-66%

File size savings Saved 66%

Private PDF merger in your browser

Merge PDFs. Keep every document private.

Combine multiple PDF files in the order you choose, with optional compression before merging. Your documents stay on your device.

Choose two or more PDF files

Drag and drop PDFs here, or click to browse

Up to 20 files, 250 MB combined

Merge order

Arrange your PDF files

Pages are combined from top to bottom. Use the arrow buttons to change the order.

Compress before merging

Optional. This can reduce the final file size, but processing takes longer and may reduce image quality.

0%

Preparing PDFs...

Keep this tab open while SleekPDF processes your files locally.

PDFs merged successfully

Your combined PDF is ready to download.

Files combined 2

Total pages 4

Output size 1.2 MB

How it Works

SleekPDF processes PDFs inside your browser for compression and merging. Selected documents are not uploaded to a SleekPDF file-processing server. Optional Balanced and Maximum compression may render pages as compressed images.

Why SleekPDF?

Local document processing: Your PDF contents are handled in browser memory instead of being sent to a document-processing server.
No Upload Waiting: Processing starts without first transferring the PDF to a document-processing server.
Flexible controls: Choose compression quality, arrange merge order, and optionally compress documents before combining them.

Frequently Asked Questions

Are my files uploaded to a server?

SleekPDF does not upload PDF contents to a document-processing server. Compression and merging run in your browser. The site may still connect to hosting, analytics, and advertising services for normal webpage delivery.

Is there a file size limit?

The compressor supports one PDF up to 100 MB. The merger supports up to 20 PDFs, with a maximum of 100 MB per file and 250 MB combined.

Will the compression reduce my document's text readability?

Balanced and maximum compression can change image quality and may rasterize page content. Lossless mode avoids intentional image-quality reduction, but every downloaded file should still be reviewed against the original.

Is SleekPDF free to use?

Yes. SleekPDF does not require an account or subscription. The site may display advertising after its advertising account is approved.

Will merging preserve forms, links, and bookmarks?

SleekPDF preserves ordinary page content and order, but some interactive features, document-level bookmarks, signatures, or forms may not survive merging or pre-merge compression. Always review the result.

Simple by design

How to compress a PDF in three steps

SleekPDF keeps the workflow short while giving you control over the tradeoff between file size and visual quality.

1
Choose your PDF

Drag a PDF into the compressor or select one from your device. Files up to 100 MB are supported.
2
Select a compression mode

Use Lossless for structural optimization, Balanced for everyday documents, or Maximum for the smallest result.
3
Download and review

Compare the file sizes, download the compressed PDF, and check it against your original before sharing.

Which PDF compression level should I choose?

Start with Balanced for email, forms, presentations, and general sharing. Choose Lossless when preserving the original structure matters most. Choose Maximum when file size is the priority and lower image detail is acceptable.

Compress a PDF now

Simple and private

How to merge PDF files in three steps

Arrange documents, choose whether to compress them, and create one PDF without uploading the files.

1
Add your PDFs

Select between 2 and 20 PDF files from your device.
2
Arrange and optimize

Set the file order and optionally compress every document before merging.
3
Merge and download

Create one PDF, download it, and review the page order before sharing.

Should I compress before merging?

Leave compression off when quality and interactive PDF features matter most. Turn it on when a smaller combined file is more important; balanced and maximum modes may rasterize pages or reduce image detail.

Merge PDFs now

About SleekPDF

An independent, focused PDF utility

SleekPDF is an independently maintained browser utility for compressing and merging PDFs without sending document contents to a file-processing server. It does not require an account, subscription, or software installation.

Processing results depend on the documents. Always keep your original files and check every downloaded PDF before sharing or deleting the sources.

Privacy Policy

Last updated: July 18, 2026

Document processing

PDF compression and merging run in your browser. SleekPDF does not upload document contents to a file-processing server. Selected files and generated results remain in browser memory until you close or reload the page.

Local preferences

The site stores your language and theme preferences in your browser's local storage. These preferences do not contain your PDF contents.

Analytics

SleekPDF uses Google Analytics to understand visits and feature usage. Google may receive browser and device information, approximate location derived from an IP address, and interaction events. SleekPDF does not send PDF contents or file names to Analytics.

Advertising and third parties

SleekPDF uses Google AdSense for consent management and advertising. Ads may begin after the site is approved. Google and its partners may use cookies, IP addresses, web beacons, or similar identifiers to deliver, measure, and personalize advertising where permitted.

How Google uses data on partner sites

Manage Google advertising preferences

Terms of Service

Last updated: July 18, 2026

Permitted use

You may use SleekPDF for lawful personal or commercial documents that you are authorized to process. You remain responsible for the documents you select and the generated files you download.

Processing results

Compression and merging can change image quality, page rendering, accessibility, forms, links, bookmarks, signatures, metadata, and other PDF features. Review every downloaded file and retain your originals.

Intellectual property

SleekPDF's branding, interface, original text, and first-party source code are protected works. You may use the PDF tools, but you may not copy, republish, rebrand, or operate a duplicate of the website without written permission.

Service availability

SleekPDF is provided as available without guarantees that every PDF can be processed or that the service will always be uninterrupted. To the extent permitted by law, SleekPDF is not responsible for loss caused by relying on an unchecked output file.

Changes

The tool and these terms may be updated when features, legal requirements, or operating practices change. The revision date above identifies the current version.