Compress PDF Online Free — Reduce File Size

Compress PDF

Reduce PDF file size while keeping quality. Free and instant.

🔒 Files never uploaded⚡ Instant processing♾️ Free forever✓ No sign up

Drop your PDF here to compress

or click the button below to browse your files

Frequently asked questions

Will compression reduce the quality of my PDF?+

No. PDFcraft doesn't currently recompress or downsample images — it only optimizes the file's internal structure. Text, images, and layout are visually unaffected.

How much can PDFcraft compress a PDF?+

It varies a lot by file — you'll see your exact before-and-after size after compressing. PDFs with a lot of repeated internal structure (forms, multi-page documents) tend to shrink more than image-heavy scans, since PDFcraft doesn't currently recompress embedded images. For large scanned PDFs, deleting unnecessary pages is often more effective.

Is there a file size limit?+

No artificial limit. Your device memory is the only constraint.

Are my files safe?+

Yes. Files are processed locally. Nothing is uploaded to any server.

Does it work on iPhone?+

Yes. Open PDFcraft in Safari on iPhone and it works immediately.

Other Free PDF Tools

Compress PDF Online — Free & Private

PDFcraft's free PDF compressor reduces your PDF file size instantly in your browser — no uploads, no sign up, and no watermarks. Whether you need to compress a PDF for email, WhatsApp, or website upload, PDFcraft makes files smaller without visible quality loss.

What does the Compress PDF tool do?

The free PDF compressor optimizes the internal structure of your PDF file — consolidating and streamlining how objects are stored — without touching the visible content of your document. This tends to help most on PDFs with a lot of repeated internal structure, like multi-page documents or forms. It does not currently re-compress or downsample embedded images, so a PDF that's large mainly because of high-resolution photos or scans may only shrink a little. For those files, deleting pages you don't need (via PDFcraft's Delete Pages tool) or splitting the document usually makes a bigger difference. Text and images are never altered — the compression process runs entirely in your browser using JavaScript, and your files never get sent to any server.

How to compress a PDF online — step by step

Click Select File or drag your PDF into the upload area
Your PDF loads locally in the browser — never uploaded anywhere
Click Compress PDF to start the optimization process
See the original vs new file size comparison
Click Download to save the compressed PDF

Why use PDFcraft to compress PDFs?

100% free — no limits, no premium plan required
No file uploads — compression happens locally in your browser
No quality loss — text stays sharp, documents stay readable
No sign up — open the tool and start immediately
Works on mobile — compress PDFs on iPhone or Android
Instant results — most PDFs compress in under 5 seconds

Common use cases for compressing PDFs

Compress PDF for email — keep files under Gmail's 25MB limit
Reduce PDF size for WhatsApp — stay under the 100MB file limit
Compress PDFs for website upload forms and portals
Reduce storage space for archived documents
Compress scanned documents for faster sharing
Make PDFs load faster when embedded on websites

Is compressing PDFs online safe?

With PDFcraft, completely safe. Your PDF is compressed locally in your browser — it never gets uploaded to any server. This is critical for confidential documents like financial reports, contracts, and medical records. PDFcraft cannot access your files even if it wanted to — all processing happens entirely on your device.

Wondering how much this tool will actually shrink your file? We ran real tests on four PDF types and measured the results →

Merge PDF Split PDF Delete Pages PDF to Image Protect PDF