Compress PDF
Rewrites the PDF with object streams and drops unused objects, which reduces size losslessly — text, vectors and image quality are untouched. Scanned PDFs, where nearly all the weight is one big image per page, benefit less from this than from image downsampling.
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Drop your file here
PDF files. Nothing is uploaded — your file stays on this device.
Settings
Removes the author, producer and creation dates stored in the file.
Add a file to continue.
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About Compress PDF
- What does Compress PDF do?
- Rewrites the PDF with object streams and drops unused objects, which reduces size losslessly — text, vectors and image quality are untouched. Scanned PDFs, where nearly all the weight is one big image per page, benefit less from this than from image downsampling.
- Who is it for?
- Students handing in work, professionals sending contracts and reports, administrators preparing submissions, and anyone who has hit an email attachment limit. No technical knowledge is needed.
- Is it free?
- Yes. Compress PDF is free with no account, no watermark on your output, no daily cap and no trial period. Because it runs on your own device it costs us nothing to run, which is why there is no catch.
- Is it safe to use with confidential files?
- Yes, and not because we promise to behave. Compress PDF never sends your file anywhere — the work happens in your browser. There is no upload, so there is no copy of your document in our systems at any point.
- What file formats are supported?
- Input: PDF. Output: PDF.
- Are there any limits?
- Lossless compression only in this deployment. Image downsampling for scanned PDFs is on the roadmap and needs a server-side engine.
- How much smaller will my file get?
- It depends entirely on the file. PDFs exported from Word or a design tool often shrink 10–40%. A scan that is one JPEG per page may barely shrink at all, because the images are already compressed and this tool does not re-encode them.
- Will the quality drop?
- No. This is lossless — it removes structural waste, not detail. If you need aggressive size reduction on a scan, converting pages to images at a lower resolution is the honest alternative.
- Why do some sites compress more than this?
- They re-encode the embedded images at a lower quality on a server. That works, but it means uploading your document and accepting quality loss. We would rather tell you the trade-off than hide it.
How to use it
- 1
Add your file
Drag it onto the box above, or use Browse files. On a phone you can also take a photo or pick from your camera roll.
- 2
Check the settings
Sensible defaults are already chosen. Most people never need to change them.
- 3
Run it
The progress bar shows real progress, not a decorative animation. Everything happens on your device.
- 4
Preview the result
Look at the output before you download. If it is not right, adjust a setting and run it again — nothing has been saved anywhere.
- 5
Download
Save the file. Closing this tab discards it from memory, so download anything you want to keep.