Reduce PDF file size while maintaining quality. Perfect for email attachments and web uploads.
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Compression quality
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Compress PDF reduces file size so documents are easier to email, upload, or store. Synthixx Compress PDF is free, watermark-free, and designed for practical size targets without forcing a paid plan.
Large PDFs often contain high-resolution images or inefficient streams. Compression re-encodes and optimizes where possible so the download is smaller. Exact savings depend on content: already-optimized files shrink less than photo-heavy scans.
Compress when you must keep PDF format but need a smaller file. Convert to images or Word only if you need a different format — compression alone is usually enough for email limits.
If quality looks soft after a strong compress, retry with a milder setting if available, or compress page ranges after splitting. For web delivery, Optimize PDF for Web may also help. Merge first if you have many small files, then compress once.
Remove unused pages first, flatten when appropriate, and avoid recompressing the same file repeatedly. Download the result and check critical pages before sharing.
Delete blank or duplicate pages before compressing. Scanned PDFs compress differently than text PDFs — OCR can help long-term searchability but may change size. Always spot-check logos and fine print after compression.
Uploads use HTTPS and exist to fulfill your compress job. Outputs are temporary; Synthixx schedules cleanup and does not add a watermark.
Treat highly confidential files with caution on any online compressor. For routine office PDFs, automatic deletion after processing is the standard privacy posture on Synthixx Tools.
Pair Compress PDF with Merge, Split, Protect, and Optimize PDF for Web depending on whether you are packaging, trimming, securing, or publishing.
See also Bulk Compress PDF for folders of files, and PDF to JPG/PNG if image export is the real goal.
Medium is recommended for most files. High keeps more quality. Low aims for the smallest file size.
You can compress PDFs up to 200 MB.