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Honest overview
Sejda PDF is a solid online PDF toolkit that includes compression, but its free tier enforces a 3-tasks-per-hour limit and 50-page or 50MB file caps. PdfPixels supports PDF files up to 50MB for compression with no hourly task cap. Both tools offer good compression quality for typical office and scanned PDFs. The practical choice often comes down to how frequently you compress files: occasional users may not notice Sejda's limits, while users who compress multiple PDFs throughout the workday will hit the cap and either wait or look for an alternative.
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Key differences
Topic
Free task limits
PdfPixels
No hourly or daily compression task limit
Sejda PDF
Sejda free: 3 tasks per hour, then a waiting period
Topic
File size limit
PdfPixels
Up to 50MB per PDF
Sejda PDF
Sejda free: 50MB and 50-page cap per task
Topic
Account requirement
PdfPixels
No account needed to compress and download
Sejda PDF
No account for free tier; Pro subscription for higher limits
Topic
Compression options
PdfPixels
Recommended / High / Extreme presets
Sejda PDF
Screen / Ebook / Printer / Prepress / Default quality presets (Ghostscript-based)
Choose PdfPixels when
- You compress PDFs frequently throughout the day and will hit Sejda's 3/hour free limit
- You want no-account, no-wait compression from your browser
- You need to compress a PDF that is close to 50MB
Choose Sejda PDF when
- You need Sejda's specific features like splitting, editing text, or adding pages in the same session
- You prefer Sejda's desktop app for offline batch compression
- You use Sejda Pro for its larger file limits and unlimited tasks
Verdict
Both tools are capable free PDF compressors. PdfPixels has no hourly task caps, making it better for users who compress multiple documents per hour. Sejda has a broader set of PDF editing features in one platform, which is valuable if you need to do more than just compress.
FAQ
How does PdfPixels compression compare to Sejda quality?
Both use server-side compression engines that produce comparable results for typical office and scanned PDFs. At equivalent preset levels, the output file size difference is usually under 5-10%. Test both with your specific document type if compression ratio is critical.
What happens when I hit Sejda's free limit?
Sejda imposes a 1-hour waiting period after 3 free tasks. During this time, you can use PdfPixels as an alternative with no waiting period.
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