How to Make a PDF File Smaller for Free
Reduce PDF file size for email, upload, or storage. Multiple free methods explained — browser, Mac, Windows, mobile.
Large PDF files slow email, fail upload checks, and waste storage. This guide covers all the free ways to make a PDF smaller across every platform.
Fastest Method: FixMyPDF
Go to fixmypdf.in/tools/compressor. Upload. Choose compression level. Download. Works on any device, no software, no upload to server. Typically reduces PDF size by 40–80%.
On Mac (Built-In)
Open PDF in Preview. File → Export as PDF → Quartz Filter → Reduce File Size. Results vary. Use FixMyPDF for more reliable and controllable compression.
On iPhone
Open Safari, go to fixmypdf.in/tools/compressor. Upload from Files. Choose compression. Download. No app needed.
Why PDFs Get Large
Embedded high-resolution images. Fonts embedded at full size. Scanned pages as uncompressed images. Multiple revisions increasing file size over time.
If Compression Is Not Enough
Remove pages you do not need (use the split tool). Convert to grayscale (use the grayscale tool) — colour images are 3× the size of grayscale equivalents. Combine split-and-compress: split into sections, compress each, re-merge.
Try Compress PDF Now — Free
Browser-based, private, and instant. No account or software required.
Open Compress PDF