Compress PDF — Free Online
Reduce your PDF file size without quality loss. Fast, private, and free. No signup, no watermarks.
MergeAny combines two or more JPG, JPEG, or PNG images into a single file directly in your browser — vertically, horizontally, or in a grid. There is no upload limit, no watermark, and your files are deleted from our servers seconds after merging. Works on Windows, Mac, iPhone, and Android with no install and no signup.
How to Compress a PDF Online
Upload Your PDF
Drag and drop or click to select your PDF — no account required, up to 50 MB.
Automatic Compression
Our server compresses content streams and removes redundant data instantly.
Download Smaller PDF
Click Compress PDF and save the reduced file. Content is identical to the original.
Why Compress a PDF?
Large PDFs are slow to email, difficult to upload to web forms, and take up unnecessary storage space. Many email providers cap attachments at 10–25 MB, and document portals often impose similar limits. Compressing your PDF before sending ensures it arrives reliably.
Not all compression is equal. Image-resampling approaches — used by many online tools — reduce image resolution to shrink file size. This is fast but permanently degrades image quality. MergeAny uses lossless stream compression, which reorganizes and encodes the underlying data more efficiently without touching the images at all.
PDFs created by older software, print drivers, or certain export settings often contain uncompressed or poorly compressed data streams. Running them through this tool removes that overhead, typically achieving 20–60% size reduction for unoptimized files. PDFs already exported with modern compression settings may see only marginal improvement.
PDF Compression Features
Shrink your PDFs without sacrificing a single pixel of quality.
Lossless Compression
Stream-level compression only — no images are re-encoded, no text is altered, no pages removed.
Instant Processing
Even large multi-page PDFs compress in seconds. No waiting queues.
Privacy First
Your file is processed in memory and deleted immediately after download.
Preserves All Content
Fonts, images, annotations, bookmarks, and metadata are all preserved perfectly.
No Signup, No Watermark
Free and browser-based. Works on Windows, Mac, iPhone, and Android.
Size Report
After compression, the download shows original vs. compressed size so you can see exactly how much space was saved.