Edit, sign, merge, split and compress PDFs privately in your browser.

by FlowLab
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Compress PDF Online

Reduce large image-heavy PDFs so they are easier to upload, email, or share. Choose a compression level and download the smaller file from your browser.

Edit PDFSign PDFMerge PDFSplit PDFCompress PDFImage to PDF
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Attach a PDF to start signing
Drag and drop your PDF here, or tap to attach.

Private PDF tools for everyday documents

FlowPDF helps you handle common PDF tasks with privacy first. Your files are processed inside your browser, so you can edit, sign, merge, split, compress and convert PDFs without uploading them to a third party server.

Frequently asked questions

Can I edit a PDF online for free?

Yes. Attach your PDF and use FlowPDF to add text, signatures, highlights, whiteout, shapes and simple annotations.

How do I merge PDF files?

Choose Merge PDFs, attach your files, arrange the order and download the combined PDF.

Can I compress a PDF?

Yes. FlowPDF can reduce the size of image heavy PDFs directly in your browser.

Do I need to install anything?

No installation is needed. FlowPDF runs in your web browser.

Are my PDFs uploaded to a server?

No. FlowPDF is designed to process files in your browser, so your documents do not need to be uploaded to a third party server.

Is FlowPDF safer for private documents?

FlowPDF reduces security concerns by keeping PDF processing local in your browser instead of sending files to an external server.

✅ Done

Your PDF is ready.

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Delete selected item?

This will remove the selected signature, stamp, text, tick, or cross from the PDF.

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Open Full Screen Editor?

Your PDF is ready. Full Screen Editor gives you more space for text, tick, cross, shapes and signatures.

Tip: On mobile, FlowPDF switches to Quick Edit with large buttons and a simpler toolbar.

Compress PDF Online FAQ

What PDFs compress best?

Scanned or image-heavy PDFs usually shrink the most.

Will compression affect quality?

Higher compression can reduce visual quality, so FlowPDF includes balanced and sharper settings.

Can links or selectable text be affected?

Compression may rebuild pages as images, so selectable text and links can be lost.