Compress PDF files online to reduce their size. Shrink large PDFs for email, web upload, or storage, free, local processing, no server upload.
The PDF Compressor shrinks bulky PDFs so they fit email limits and upload faster, with quality modes that let you trade size for fidelity. Compression runs entirely in your browser, so confidential files are never sent to a server.
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Most oversized PDFs are heavy because of high-resolution images and embedded scans, not text. Compression re-encodes those images at a sensible resolution, which is why a scanned document can shrink dramatically while a text-only one barely changes.
Drop in the large file you need to shrink.
Choose high-fidelity for minimal loss or a smaller mode for maximum reduction.
Watch the file-size reduction calculated locally in real time.
Save the lighter PDF, ready to email or upload.
High-fidelity mode keeps documents looking pristine while removing waste; stronger modes push the size down further for cases where a smaller file matters more than perfect sharpness. Pick based on whether the PDF is for archiving or quick sharing.
Emailing a PDF to a compression website means handing over its contents. Local compression keeps the file on your machine, so you can shrink invoices, IDs, and contracts without exposing them.
Upload your PDF, select your compression level (screen, ebook, or print quality), and click Compress. Download the smaller file instantly, no signup, no watermark.
Compression varies by content: PDFs with photos typically compress 40-80%. Text-only PDFs may only compress 10-30%. Scanned document PDFs with high-res images can often be reduced by 60-90%.
It depends on the mode. 'High Fidelity' mode minimizes quality loss, keeping text sharp. 'Maximum Compression' reduces quality more to achieve the smallest file size. Choose based on your use case.
Gmail and Outlook support attachments up to 25MB. For sharing via email, aim to keep PDFs under 10MB. This tool can typically get most PDFs under that limit.
No. Compression runs entirely in your browser. Your PDF file never leaves your device, making it safe for compressing confidential or sensitive documents.
The compression ratio depends on content type. PDFs containing high-resolution photos compress dramatically (50-80%). PDFs that are mostly text compress very little (5-15%) since text data is already compact. Scanned document PDFs with embedded bitmap images compress the most.
Use the quality slider and watch the live output size and reduction percentage update as you drag. Lower the quality until the estimated size drops below your target (for example 100 KB for a form upload or 1 MB for email), then download. Scanned/image-heavy PDFs shrink the most.
Drop the PDF in, move the quality slider down until the size meets the limit (many email and government forms cap at 1-5 MB or a specific KB value), and download the smaller file. All of this happens in your browser, so the document is never uploaded.
Compression works by re-sampling page images, so there is a deliberate quality-for-size trade-off that you control with the slider. Text usually stays crisp; only image resolution is reduced, and you see exactly how much before you download.
No. Compression runs in your browser and the file never leaves your device.
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