How do I compress a PDF for free?

Go to gotopdf.net/compress-pdf/, drop in your PDF, click Compress PDF, and download the smaller file. No sign-up required.

How much smaller will my PDF get?

Text-heavy PDFs often shrink 10–40%. PDFs that are mostly scanned images or already optimised may shrink less.

Will compression affect quality?

The browser compressor rewrites the PDF structure without re-encoding images, so visual quality is generally preserved.

Why didn't my PDF shrink?

Some PDFs are already at minimum size. Image-heavy or scanned PDFs are hardest to compress further in a browser.

Compress PDF

How to Compress a PDF Without Losing Quality

Updated May 2026 · 4 min read

A bloated PDF can bounce back from an email server, fail to upload to a portal, or eat up your storage quota. This guide shows you the fastest way to shrink a PDF file — and what to do when a simple browser compressor isn't enough.

Compress your PDF in seconds — free, private, no sign-up.

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How to Compress a PDF in 3 Steps

Open the Compress PDF tool — go to gotopdf.net/compress-pdf/.
Add your PDF — drag it onto the drop zone or click "Select file".
Click Compress PDF — your browser rewrites the file structure to reduce size. Download the result.

Most files are processed in under 10 seconds. The tool shows you the before and after file size so you can see exactly how much was saved.

How Much Will My PDF Shrink?

Results depend on what's inside the PDF:

PDF type	Typical reduction
Text documents (reports, contracts)	15–40%
Mixed text and images	10–25%
Scanned documents (image-only)	0–10%
Already-compressed PDFs	0–5%

If your PDF is mostly scanned images or was already exported from a tool that optimises on output (like Canva or Word), a browser compressor may have little room to work. In that case, see the options below.

Why Does PDF File Size Matter?

Email limits: Most email services cap attachments at 10–25 MB.
Upload portals: Government, legal, and HR portals often impose strict size limits.
Storage: Dozens of large PDFs add up quickly in cloud storage.
Page speed: If you embed PDFs on a website, smaller files load faster.

What Does Browser Compression Actually Do?

GoToPDF's browser compressor uses pdf-lib to rewrite the PDF's internal structure. It removes redundant objects, strips unused metadata, and tidies up cross-reference tables — without touching images or text content. This is lossless compression: the visual output is identical to the original.

This approach is fast and private (no upload), but it won't re-encode JPEG images at lower quality or downsample high-DPI images — which is where the biggest file size savings come from in image-heavy PDFs. For those, a dedicated desktop tool like Adobe Acrobat or Ghostscript can push the size further.

Tips to Get the Most Compression

Start at the source

If you're creating the PDF yourself (exporting from Word, PowerPoint, or Canva), check the export settings. Most apps have a "Compress images" or "Web optimised" option that produces smaller files from the start.

Split before compressing

If you only need a few pages from a large PDF, split it first to extract those pages, then compress the smaller file.

Remove unnecessary pages

Cover pages, blank pages, and appendices you don't need all add to the file size. Split them out before compressing.

Frequently Asked Questions

Is there a file size limit?

No enforced limit. Very large PDFs (100 MB+) may take a moment since processing is in your browser.

Is my PDF safe?

Yes. Your file never leaves your device. All compression runs locally in your browser.

Can I compress a password-protected PDF?

Password-protected PDFs must be unlocked before compression. The tool will show an error if it can't read the file.

Will fonts be affected?

No. Font data is preserved as-is. Only structural overhead is removed.

Reduce your PDF file size now — no software needed.