Question 1

How do I compress a PDF for free?

Accepted Answer

Upload your PDF to compressfiles.online, choose a compression level (Low, Medium, or High), then click Compress PDF. Your compressed file is ready to download in seconds — completely free, no sign-up required.

Question 2

How do I compress a PDF under 1MB?

Accepted Answer

Select the High compression level on compressfiles.online. This re-encodes images at maximum reduction and typically achieves 85–90% file size reduction, which brings most PDFs well under 1MB. See our dedicated guide at compressfiles.online/compress-pdf-under-1mb/.

Question 3

How do I compress a PDF under 500KB?

Accepted Answer

Use the High compression level on compressfiles.online. For image-heavy PDFs this usually achieves over 85% reduction. If the result is still above 500KB, try splitting the PDF into smaller sections first. See our guide at compressfiles.online/compress-pdf-under-500kb/.

Question 4

Is my PDF file kept private?

Accepted Answer

Yes. Files are processed in memory and never stored on disk. The compressed PDF is generated on-the-fly and immediately deleted from the server after you download it. No data is retained.

Question 5

What is the maximum PDF file size I can compress?

Accepted Answer

CompressFiles supports PDF files up to 50 MB. Files above 5 MB are uploaded directly to a secure CDN to bypass serverless function limits, so large files are fully supported.

Question 6

Does compressing a PDF reduce its quality?

Accepted Answer

Quality depends on the compression level you choose. Low compression preserves near-original quality (ideal for print). Medium is a balanced trade-off for email and sharing. High gives the smallest file size with some image quality reduction, best for web uploads and archiving.

Question 7

How do I compress a PDF for a job application?

Accepted Answer

Upload your CV or resume PDF to compressfiles.online and select Medium compression. This typically reduces the file to under 1MB while keeping text sharp and readable — ideal for email attachments and job portal uploads. See our guide at compressfiles.online/compress-pdf-for-job-application/.

Free PDF & Image Compressor Online — Reduce File Size by Up to 90%