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Private browser-based PDF compressor

Compress PDF Online for Free

Compress PDF files online to reduce PDF file size in seconds for email attachments, online upload forms, school reports, and client documents. This browser-based workflow processes your PDF on your device, so you can prepare a smaller file without handing documents to a server.

Use low or medium compression when quality matters, or stronger reduction for scanned PDFs and image-heavy files that are too large to send or submit.

Your files stay in your browser
No upload required
No account needed

Common use cases

Built for everyday compression tasks that need to be finished fast.

  • Email

    Reduce PDF size for email attachments when sending contracts or other client documents.

  • Uploads

    Make school reports and supporting files easier to submit in online forms and portals.

  • Scanned PDFs

    Shrink scanned PDFs and image-heavy paperwork before submissions or archiving.

  • Storage

    Create smaller PDF files for cloud storage and keep large image-rich reports easier to handle.

Start by adding your PDF and reduce file size in seconds.

1 Add File
2 Compression Level
3 Download

Step 1: Add PDF File

Drag & Drop your PDF here

or

Supported: PDF Files

Why use this PDF compressor?

Use it when you need a smaller PDF file without changing your workflow or giving up privacy.

This PDF compressor helps you reduce file size before you send documents by email, upload them to websites, or store them in shared folders. It is useful when a PDF is too large for an application portal, takes too long to upload, or makes everyday sharing harder than it needs to be.

Because compression runs directly in your browser, you can optimize PDFs containing contracts, invoices, resumes, reports, and study materials while keeping the process private. Text-heavy files often shrink a little, while scanned PDFs and image-heavy documents usually see the biggest file-size reduction.

Best For

Reducing PDF size before email attachments, client uploads, online forms, and shared folder storage.

Works Well On

Scanned PDFs, image-heavy reports, and large documents that are slow to upload, send, or archive.

Privacy Advantage

Your document stays in your browser, so you can optimize file size without handing the PDF to a server.

Privacy
100% Client-Side
File Limits
No Size Limits
Cost
Free Forever
Watermarks
None

How to compress PDF files online

Follow these simple steps to compress PDF online, reduce PDF file size, and download a smaller document.

1

Add your PDF file

Add the PDF file you want to compress. The file stays in your browser, so there is no server upload step and no registration requirement.

2

Select Compression

Choose low, medium, or high compression depending on whether you want the best visual quality, the smallest file, or a balance between both.

3

Download

Compress the file and download your smaller PDF for email attachments, uploads, online forms, and long-term storage.

Compress PDF online quickly and securely

You can compress PDF online in seconds here without sending the file to a remote server. Everything runs in your browser, which keeps the process private while still giving you a faster way to reduce file size.

Smaller PDFs are easier to email, upload, store, and share with clients, teams, or application portals. If you need fast file-size reduction without extra steps, this browser-based workflow keeps things simple.

If the document contains unnecessary content, you can remove PDF pages before compressing so the final file is both shorter and smaller.

Compress PDF without losing quality

Choose the right level for the document you are working with instead of compressing everything as hard as possible.

If you want to compress PDF without losing quality, start with low or medium compression. Those options are usually the best choice for resumes, reports, invoices, and text-heavy documents where readability matters more than aggressive size reduction.

Image-heavy and scanned PDFs can be reduced much more, but stronger compression may soften photos or page scans. If the file still looks too large, try medium first, check the result, and only move to high compression when smaller size matters more than fine image detail.

When Should You Compress a PDF?

Compression is most helpful when file size gets in the way of sharing, uploads, or storage.

Compress scanned PDFs and large files

Scanned PDFs and image-heavy files are often the largest because each page behaves more like a picture than plain text.

A scanned PDF usually contains full-page images, which means even a short document can become surprisingly large. That is why scanned paperwork, signed forms, and photo-based records are some of the best candidates for compression.

Image-heavy PDFs often show the biggest savings, while text-heavy PDFs may reduce less because there is less visual data to optimize. If your file combines both text and scans, medium compression is often the safest place to start before switching to high compression for maximum reduction.

Compress PDF for email and uploads

Use compression when a file is too large for inbox limits, upload forms, or document portals.

If you need to reduce PDF size for email, compression can help you stay under attachment limits without rebuilding the document from scratch. The same applies when a portal rejects a file because it is too large for job applications, vendor paperwork, school submissions, or customer document uploads.

Sending Checklist

For client documents and school reports, start with medium compression, download the smaller PDF, and check that text, signatures, and images remain readable before attaching or uploading it.

Prepare a report with a cover page Assemble documents into one PDF Divide an oversized submission Complete a file with a signature Reduce source image sizes first

Compress PDF FAQ

Common questions about compressing PDF files online, keeping quality, and reducing upload problems.

Is this PDF compressor free?
Yes. You can compress PDF files here for free with no account, no watermark, and no forced upload to a server.
Is it safe to compress PDF files here?
Yes. Compression runs directly in your browser, so your files stay on your device while you reduce PDF size.
Are my files uploaded to a server?
No. This tool is browser-based, so your PDF is processed locally instead of being uploaded for remote compression.
How do I compress PDF files online?
Add your PDF file in this browser-based tool, choose a compression level, and download the smaller file. Medium compression is a good starting point for most documents because it balances quality and size.
Why is my PDF so large?
Large PDFs usually contain high-resolution images, scanned pages, embedded fonts, or extra metadata. Scanned and image-heavy documents often benefit the most from compression.
Does compressing a PDF reduce quality?
It can, especially at stronger compression levels. Text usually stays readable, while photos and scanned pages may lose some detail if you choose maximum reduction.
Can I compress scanned PDFs?
Yes. Scanned PDFs are often large because each page is stored as an image, so they are strong candidates for file size reduction.
Does it work for image-heavy PDFs?
Yes. Image-heavy PDFs often see the biggest savings because compression can optimize embedded pictures and scanned page images.
Will text stay readable after compression?
In most cases, yes. Low and medium compression usually keep text clean and readable while still reducing PDF file size.
Does it work on mobile devices?
Yes. You can compress PDF files on modern phones and tablets as long as the browser and device have enough memory for the file you open.
What should I do if my PDF is still too large?
Try a stronger compression level, remove unnecessary pages, split the document into smaller parts, or compress large images before turning them into PDFs.
What is the difference between compressing and splitting a PDF?
Compression reduces the file size of the existing document, while splitting creates smaller separate PDF files by dividing pages into new documents.
What is the best PDF size for email?
Attachment limits vary by email provider, but keeping a PDF below 10 MB is a practical target for easier sending and receiving. If your provider has a lower limit, compress the PDF until it fits that requirement.
Should I compress images before creating a PDF?
Yes, when large photos or graphics are the reason your PDF will be heavy. Reducing image size before creating the PDF can produce a smaller document while giving you more control over visual quality.

PDF workflow before and after compression

Prepare your source document first, then finish the smaller PDF for sending or submission.

Add a cover page before reducing file size

Prepare a polished report or client document before compressing the final PDF.

Combine PDFs before compression

Combine separate PDFs into one file, then reduce the final document size for easier sharing.

Optimize large images before PDF creation

Reduce picture size first when photographs or graphics make the source document heavy.

Separate pages from a compressed PDF

Break a long PDF into smaller files when one compressed document is still too large.

Sign your smaller PDF before sending

Add your signature after compression so the final file is smaller and ready to send.

For email attachments, upload forms, school reports, and client documents, a quick readability check after compression helps you send a smaller file with confidence.