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PDF Compressor

Reduce PDF file size by up to 85% with adjustable quality, presets, and advanced controls. No upload, no signup, no watermark — completely free.

No signup required Unlimited free Up to 85% smaller

Features

Powerful PDF compression

Advanced compression controls with presets, quality sliders, and real-time previews — all in your browser.

100% Browser-Based

Your PDF files are compressed entirely in your browser. No uploads, no servers — your documents stay completely private.

4 Compression Presets

Choose from Light, Balanced, Strong, or Extreme compression. Each preset balances quality and file size differently.

Quality Slider

Fine-tune JPEG compression quality from 10% to 100%. Lower quality means smaller files, higher quality means better visuals.

Page Scale Control

Adjust the rendering scale from 0.5x to 3.0x. Lower scales reduce file size by rendering at smaller dimensions.

Image Format Selection

Choose between JPEG and PNG output formats. JPEG offers better compression for photos, PNG for text-heavy documents.

Grayscale Mode

Convert PDF pages to grayscale to dramatically reduce file size. Perfect for text-only documents where color is unnecessary.

Page Range Selection

Compress all pages or specify a custom page range. Useful for large PDFs where only certain pages need compression.

Live Size Comparison

See original vs compressed file size with savings percentage, compression ratio, and processing time at a glance.

Visual Preview

Preview the first page of your compressed PDF before downloading. Verify quality meets your expectations.

Keep Original Dimensions

Preserve the original page size of your PDF, or let the compressor optimize dimensions for better compression.

Remove Metadata

Strip metadata from your PDF to reduce file size and enhance privacy. Removes embedded author, title, and other metadata.

Flatten Annotations

Flatten PDF annotations and form fields into the page content. Reduces complexity and file size.

Detailed Statistics

Get detailed stats including pages processed, compression ratio, time taken, and preset used. Full transparency.

Drag & Drop Upload

Simply drag and drop your PDF file into the tool area, or click to browse. No complicated upload forms.

Progress Tracking

Watch real-time progress as each page is processed. Know exactly how far along the compression is.

No File Size Limits

Compress PDFs of any size — the only constraint is your device’s available memory. No artificial caps or restrictions.

Free & Unlimited

Compress as many PDFs as you want. No daily limits, no credits, no watermarks, no signup required.

Reset & Start Over

Clear everything with one click and compress another PDF. No need to refresh the page or clear cache.

Benefits

Why compress PDFs?

Smaller PDFs save storage, reduce bandwidth, and make sharing easier across all platforms.

Save Storage Space

Compressed PDFs take up less space on your device, cloud storage, and email servers. Store more documents with the same capacity.

Faster Sharing

Smaller PDF files upload and download faster. Share documents via email, messaging apps, or cloud links without size issues.

Email-Friendly Sizes

Many email providers limit attachments to 10-25 MB. Compress your PDFs to fit within these limits and avoid bounce-backs.

Reduced Bandwidth

Serve compressed PDFs on your website to reduce bandwidth costs and improve page load times for your visitors.

Use Cases

Who uses this PDF compressor?

From email senders to web publishers, anyone who works with PDFs can benefit from smaller files.

Email Attachments

Compress PDFs to meet email attachment size limits. Send reports, invoices, and documents without worrying about size.

Web Publishing

Reduce PDF file sizes for faster downloads on websites. Improve user experience with quicker-loading documents.

Cloud Storage

Save storage space on Google Drive, Dropbox, or iCloud by compressing PDFs before uploading them.

Document Archival

Compress large PDF archives to save disk space while maintaining readable quality for long-term document storage.

Mobile Sharing

Compressed PDFs transfer faster over mobile data connections. Share documents on the go without consuming excessive data.

Print Optimization

Reduce PDF file sizes for faster printing. Smaller files process quicker on printers, especially network and wireless printers.

How It Works

Compress in three simple steps

No accounts, no uploads, no waiting. The simplest way to compress PDF files.

Upload Your PDF

Drag and drop your .pdf file into the tool area above, or click to browse and select from your device.

Choose Compression

Select a compression preset (Light, Balanced, Strong, Extreme) or fine-tune settings in Advanced Options.

Download Compressed PDF

Click compress and your optimized PDF is generated instantly. Preview, then download the compressed file.

Your file never leaves your device

Unlike other tools that upload your PDFs to servers, Convertly processes everything locally in your browser.

Pro Tips

Get the best compression results

Follow these tips to maximize compression while maintaining the quality you need.

Start with Balanced

The Balanced preset offers a good starting point — typically 50% size reduction with acceptable quality. Adjust from there.

Use Grayscale for Text

If your PDF is primarily text, enable grayscale mode. It can reduce file size by 50% or more with no visible quality loss for text.

Try Different Presets

Test different presets on the same PDF and compare results. The optimal preset depends on your specific content and quality needs.

Lower Scale for Screen

If the PDF will only be viewed on screen, lower the page scale. Screen viewing doesn’t require high-resolution rendering.

JPEG for Photos, PNG for Text

Use JPEG format for photo-heavy PDFs (better compression) and PNG for text-heavy PDFs (sharper text rendering).

Check Preview First

Always check the preview before downloading. Make sure the compressed quality meets your needs before saving the file.

FAQ

Frequently asked questions

How do I compress a PDF for free?

Upload your PDF file using the tool above, choose a compression preset, and click "Compress PDF". Your compressed file is generated entirely in your browser — no signup, no payment, no watermarks. It’s 100% free with unlimited compressions.

Will my PDF be uploaded to a server?

No. Convertly processes all PDF compression entirely in your browser using client-side JavaScript. Your files never leave your device, ensuring complete privacy.

How much can I compress a PDF?

Compression depends on the PDF content. Image-heavy PDFs can be reduced by 70-90% with the Extreme preset. Text-heavy PDFs typically see 30-60% reduction. The Balanced preset generally achieves about 50% reduction.

Will compression affect quality?

Yes, some quality reduction is expected. The Light preset maintains high quality with ~20% size reduction. The Extreme preset has noticeable quality loss but achieves ~85% size reduction. Choose based on your needs.

What’s the difference between presets?

Light: 85% quality, 2x scale (~20% smaller). Balanced: 60% quality, 1.5x scale (~50% smaller). Strong: 35% quality, 1x scale (~70% smaller). Extreme: 15% quality, 0.75x scale (~85% smaller).

Can I compress specific pages only?

Yes. In the Advanced Settings, select "Custom" page range and specify which pages to compress. This is useful for large PDFs where only certain pages need optimization.

Is there a file size limit?

No artificial limits. The only constraint is your device’s available memory (RAM). Most modern devices can handle PDF files up to several hundred megabytes. Very large PDFs may take longer to process.

Does it work on mobile?

Yes. Convertly works on all devices including smartphones and tablets. The interface is fully responsive and optimized for screens as small as 358px, so you can compress PDFs on the go.

Still have questions?

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