Is the PDF merger tool really free?

Yes. You can combine PDF files for free, with no hidden fees, no sign-up, and no watermark.

Are my files secure during the merging process?

Yes. Merging happens locally in your browser, so your files are not uploaded or stored.

Can I rearrange the order of files before merging?

Yes. After adding your PDFs, drag and drop them into the order you want before merging.

Will the quality of my PDFs be affected?

No. The merged PDF keeps the original pages and their quality.

Can I use this on mobile?

Yes. The PDF merger works on smartphones, tablets, laptops, and desktops.

Compress PDF Online

Reduce PDF file size for easier emailing, uploading, and sharing. Use the free Scan.Plus PDF compressor to optimize supported images in your documents, right in your browser.

Processed locally in your browser. No files are sent to servers.

Drop your PDFs here

or click to browse your files

Select up to 10 PDFs. Maximum 10 MB per file, 20 MB total.

Selected PDF files: 0 / 10

Limits: 10 PDFs, 10 MB per file, 20 MB total.
Selected size: 0 / 20 MB

Image compression

Optimizes supported RGB images without turning pages into images. Stronger compression can reduce image detail. Some PDFs may not get smaller. Signed and password-protected PDFs are not supported.

Swiss-engineered document tools, built with privacy in mind by Alohi

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How to compress a PDF online

Make large PDF documents more manageable without installing software or creating an account. Compression results depend on the images and existing optimization in each file.

Click “Select PDF files” or drag your PDFs into the tool. Add up to 10 files, with a limit of 10 MB per file and 20 MB in total.
Choose Balanced or Smaller file, then click “Compress PDF”. Each PDF is processed separately.
Review the original and new file sizes, then download each PDF. Check text and image readability before sharing, and keep your originals.

Why use this free PDF compressor?

Smaller PDFs for email attachments, online forms and everyday sharing.

Free PDF compression

Process up to 10 PDFs per batch with no signup or added watermark. Files remain separate, so you can download only the documents you need.

Choose size or image detail

Choose Balanced or Smaller file. The smaller-file option can reduce image detail. Review small text and images in scanned pages before emailing or printing your PDF.

Local document processing

The compression tool processes PDF contents locally in your browser rather than uploading them to a processing server. Your original files are not overwritten.

See the actual size reduction

Compare the original and new sizes for each PDF. If a file cannot be made smaller, the tool tells you and offers the unchanged original instead.

PDF compression FAQs

Is this PDF compressor free?

Yes. Compress up to 10 PDFs per batch without an account or added watermark. The limit is 10 MB per file and 20 MB in total. Signed, password-protected PDFs and XFA forms are not supported.

Are my PDFs uploaded during compression?

No. The tool processes PDF contents in your browser, not on a processing server. Downloads are separate files and do not overwrite your originals.

Can I compress a PDF to 100 KB, 200 KB or 1 MB?

A specific output size cannot be guaranteed. Page count, image content and existing compression affect the result. Compare the resulting size with your upload limit and check that the document is still readable.

Does compressing a PDF reduce quality?

This tool reduces the resolution or quality of supported embedded RGB images. Stronger compression may remove fine image detail. It does not turn whole pages into images, so existing text is not deliberately rasterized. Always review your downloaded PDF.

Why did my PDF not get smaller?

Some PDFs are already optimized or contain few compressible images. This tool optimizes supported RGB JPEG images and simple RGB image streams, and may reduce PDF structure overhead. Other image types, transparency and special color spaces are left unchanged. When no smaller result is available, you can download your unchanged original.

Start scanning now.

Scan.Plus is a secure mobile scanner available for individuals and businesses

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