Private, browser-based PDF compressor
Compress PDF online without uploading your file.
Reduce PDF file size for forms or email right in your browser. Choose the limit you need, compare the result, and keep your file on your device.
Open the PDF compressorCompress your PDF locally
The interactive compressor loads in this page. Files are processed in your browser and are not uploaded.
Selected target: 100KB. Actual output depends on the PDF and available browser memory.
Choose the right PDF size for your upload
PDF size limits vary by form, attachment field, and email service. Start with the maximum your destination allows: select a preset or enter a custom target. Compression is best-effort, and pages are recreated as images, so inspect the downloaded file before using it.
- Check the allowed file type and size for the destination before choosing a target.
- Compare the output size and review every page; small print can soften.
- Keep the original if searchable text, links, or form fields matter.
Frequently asked questions
Does my PDF leave my device?
No. PDF.js reads your file in this browser tab and the reduced PDF is assembled locally with pdf-lib. There is no upload endpoint, analytics event, account, or server-side file storage in this tool.
Will the result be exactly under my target?
Not always. A single maximum is best-effort: the tool tries the clearest setting first and uses the first attempt that fits, or the smallest attempt if none fit. The 100–200KB mode uses the clearest attempt in that interval when one exists.
Can I still select and search text?
The current reduction method rasterizes each page into an image. That usually makes a much smaller file, but it removes selectable, searchable text and original document structure. Keep the original if those matter.
What does the quality setting change?
Low keeps more visual detail and usually produces a larger file. Recommended is a practical middle ground. High uses smaller page renders and stronger JPEG compression for tight limits, with a greater chance of visible softness.
What PDFs work best here?
Short, image-heavy PDFs are the best fit. Very large or complex PDFs can use substantial browser memory, and a source that is already small may not shrink further.
Which PDF size target should I choose?
Use the maximum stated by the receiving form or email service. You can choose a preset or enter a custom limit; if the result cannot meet it, the tool tells you rather than claiming it succeeded.
Can I compress a PDF to 100KB for free on Mac or iPhone, including offline?
The free compressor runs in a modern browser and processes the selected file on your device. It is not installable offline software; an internet connection is needed to load the site, so offline use is not guaranteed.