Compress PDF
Shrink heavy PDFs by rasterizing pages at your chosen DPI and JPEG quality — batch support and exact before/after sizes, all offline.
Drop files here or click to choose
Compression re-renders pages as images at your chosen DPI — text will no longer be selectable or searchable.
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Drop one or more PDF files (batch is welcome).
- 2Pick the DPI and JPEG quality, or enable grayscale.
- 3Click Compress and compare the before/after sizes, then download.
Compress PDF
Scans and image-heavy reports are often 10× larger than they need to be. This tool re-renders each page at a resolution you pick (72–150 DPI covers screen reading and most printing) and re-encodes it as tuned JPEG, typically cutting file size by 50–90%.
Process several files at once and see the exact savings per file before downloading. Optional grayscale squeezes black-and-white scans even further. Everything runs on your device — compressed or not, your documents stay put.
Frequently asked questions
Will my PDF still have selectable text after compression?
No — this method rasterizes pages into images, so text becomes pixels. It is the trade-off for large size reductions. If you need searchable text, keep the original and share the compressed copy only where size matters.
Which settings should I choose?
96 DPI at ~60% quality is a good default for email and web. Use 150 DPI when the PDF will be printed; 72 DPI with grayscale is aggressive but fine for pure-text archives.
What if the file barely shrinks?
Very sparse text-only PDFs are already efficient and may not compress — the table will tell you honestly. Lower the DPI or quality and try again, or accept that the original was already lean.
Will my PDF lose quality?
No — the file is processed as a document structure, not re-encoded page by page, so text, fonts and embedded images keep their original quality. If anything changes it is shown before you download.
Is there a file size limit?
The practical limit is your browser's memory, not an artificial cap. Most PDFs up to a few hundred megabytes process fine on a normal computer.
Can I use it on scanned documents?
Yes. Structure operations (merge, split, rotate, page numbers) work on any PDF including scans. Text extraction needs OCR, which is a separate tool.
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Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/compress-pdf?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — compress-pdf" loading="lazy"></iframe>