PDF Compressor
Compress PDF files in your browser — clean streams, smaller downloads.
The PDF Compressor reduces file size by rebuilding your document with clean, optimized object streams right in your browser. Text-based PDFs, form exports and reports often shrink by 10–30% without any visible change.
This tool is transparent about what browser-only compression can and cannot do: PDFs that are mostly images stay large, because shrinking those images requires re-encoding them — best done on the source images first (our Image Compressor handles that), then rebuild the PDF. For documents that are mostly text, vectors and forms, the rebuilt file is genuinely smaller.
Processing happens entirely on your device with the pdf-lib engine — nothing is uploaded, so confidential documents stay private. The tool reports the before/after sizes and is honest when a file was already optimized.
Choose a PDF to compress. Processing runs locally in your browser.
How to use the PDF Compressor
- Choose the PDF you want to compress.
- Click 'Compress PDF'.
- Compare the before/after sizes.
- If the saving is small and your PDF is image-heavy, compress the images first and rebuild.
- Download the compressed version when the result is smaller.
Frequently asked questions
Why doesn't my image-heavy PDF shrink much?
Most of a scanned or image-heavy PDF's size lives in the embedded images, which this in-browser tool does not re-encode. Compress those images first (see Image Compressor) and rebuild the PDF for real savings.
Is the compression lossless?
The rebuild itself is lossless — text, layout and images are preserved exactly; only redundant structure and metadata are cleaned away. That is why savings on text PDFs are modest but always safe.
Can I compress password-protected PDFs?
No — protected files cannot be rebuilt. Remove the password in your PDF viewer first, then compress the unlocked file.
Related tools
View all file & image tools →Image Compressor
Compress JPG, PNG or WebP images in your browser — no upload, instant download.
File ToolsImage Resizer
Resize images by width, height or percentage — keep the aspect ratio or not.
File ToolsImage Cropper
Crop images to any size or aspect ratio — 1:1, 16:9, 4:3 and more.
File ToolsJPG to PNG Converter
Convert JPG photos to PNG with lossless quality — in your browser.
File ToolsPNG to JPG Converter
Convert PNG images to smaller JPG files with a quality dial.
File ToolsWebP Converter
Convert images to WebP — and WebP back to PNG or JPG.