PDF Compressor Online Free - Reduce PDF File Size

Compress PDF files

Reduce PDF file size with easy controls. Select a file and choose the balance between size and quality.

or drop a PDF here

Free | No sign-up | Your PDF is processed in this browser

Selected file-

Original size-

Pages-

StatusReady

PDF Preview

Check the first page before and after compression.

Original PDF

Your first page will appear here.

Compressed PDF

Your result preview will appear here.

Compression Settings

Choose a preset, or move the 1-100 slider for more control.

Choose your compression level

Compression strength

52

1 - Best visual quality100 - Strongest

This controls compression strength, not a guaranteed percentage of file size reduction.

Medium compression works well for many scanned PDFs. Visual compression converts pages to images and removes selectable text and links.

Advanced settings (optional)+-

Page resolution128 DPI

JPEG image quality66%

Convert pages to grayscale (may reduce size)

Changing DPI or JPEG quality sets Custom mode; moving the main slider restores automatic values.

Original Quality re-saves PDF objects without reducing picture resolution. Existing optimization may leave little or no size saving. Do not re-save digitally signed PDFs, as their signatures may become invalid.

Output settings+-

Download filename

Preparing...

Compression complete

ORIGINAL-

OUTPUT-

CHANGE-

Privacy: compression runs on your device. PDF.js and pdf-lib load from public CDNs, but the PDF data is not uploaded by this tool. Large files may require extra memory on mobile devices.

PDF Compressor Online Free

The Surfingskill PDF Compressor reduces PDF file size directly in your browser. It includes a 1-100 compression-strength control and two different methods because not every PDF can be compressed effectively in the same way.

Visual Compress vs Safe Optimize

Visual CompressRenders every PDF page at a controlled resolution and rebuilds the document with compressed JPEG page images. Best for scans and image-heavy PDFs.

Safe OptimizeRe-saves the existing PDF structure using object streams. This better preserves selectable text, links and forms, but size reduction can be small.

Compression LevelsLight, Medium and Strong presets plus the 1-100 strength slider adjust page DPI and JPEG quality. Original Quality provides a separate non-rasterizing optimization option.

Advanced ControlsManually choose render DPI, JPEG quality and optional grayscale conversion when you need more control.

Before and After StatsCompare original size, output size and the percentage reduction or increase before downloading.

Local ProcessingPDF pages are rendered and rebuilt in your browser rather than requiring a Surfingskill upload server.

How to Compress a PDF

1. Choose your PDF file.
2. Use Visual Compress if your priority is reducing file size, especially for scanned or photo-heavy documents.
3. Choose Original Quality, Light, Medium or Strong, or adjust the 1-100 compression strength slider.
4. Use Advanced settings only if you want custom DPI, image quality or grayscale.
5. Use Original Quality (Safe Optimize) instead when keeping selectable text and interactive PDF structure is more important.
6. Click Compress PDF, compare the result and download the output.

Which Compression Level Should I Choose?

Light Compression

Light mode renders pages at a higher resolution and uses higher JPEG quality. The output usually looks sharper, but the file will normally be larger than Medium or Strong mode.

Medium (Balanced) Compression

Medium (Balanced) is the default. It aims for a practical compromise between readability and file size for normal documents, scanned pages and PDFs containing photos.

Strong Compression

Strong mode uses lower render resolution and more JPEG compression. It can produce a smaller result, but fine text and images may become visibly softer.

Why Some PDFs Compress More Than Others

PDFs containing high-resolution scans and photos usually have more opportunity for size reduction. Text-only PDFs, already optimized PDFs and documents that already contain heavily compressed images may shrink much less.

Important: no browser PDF compressor can promise an exact final size for every file. Page count, image content, source compression and document structure all affect the result. Always check the final PDF before submitting or sharing it.

Does Visual Compression Keep Searchable Text?

No. Visual Compress intentionally flattens each page into a compressed image so it can reduce image-heavy PDFs more reliably in a Blogger-only browser tool. The pages aim to look like the original, but text selection, search, hyperlinks, forms and accessibility structure may be lost. Choose Safe Optimize if you need to preserve these features.

What Does DPI Mean?

DPI controls how many pixels are rendered for each page. Higher DPI can preserve finer details but produces larger images and uses more memory. Lower DPI usually creates smaller output but can make small text or detailed graphics less sharp.

Frequently Asked Questions

Why did the old PDF compressor not reduce my file?

Simply loading a PDF and saving it again with object streams does not necessarily recompress its embedded images. Image data is often the largest part of scanned or photo-heavy PDFs, so a structural re-save can produce little or no reduction.

Does this tool really compress PDF images?

Visual Compress renders pages and encodes them as JPEG images at the selected DPI and quality before creating a new PDF. This changes the image data and can therefore reduce image-heavy documents more substantially.

Can the output ever become larger?

Yes. Very small, text-only or already optimized PDFs can sometimes become larger after rasterization. The tool shows the before-and-after size so you can decide whether to keep the result.

Is the PDF uploaded to a server?

The compression logic in this version runs in your browser. PDF.js and pdf-lib are downloaded as JavaScript libraries from public CDNs, but the selected PDF is passed to those libraries locally by the page code.

Can I compress on mobile?

Yes, the interface is responsive. However, PDF rendering uses device memory and CPU, so very large PDFs may process more reliably on a laptop or desktop computer.

Can I compress password-protected PDFs?

This version does not include a password-entry workflow. Remove the PDF password using an authorized method before using the compressor.

Why is Safe Optimize sometimes the same size?

Safe Optimize avoids destructive page rasterization. If the PDF is already efficiently encoded, there may be very little redundant data that can be removed safely in the browser.

Final Words

A PDF compressor should be clear about the tradeoff between file size and document quality. No tool can guarantee strong lossless size reduction for every PDF. This Surfingskill version provides a real visual compression method for stronger reduction and a separate Safe Optimize mode for documents where preserving PDF structure is more important.

Note on signed documents: Rebuilding or re-saving a digitally signed PDF can invalidate its signature. Retain the original signed file.