Bytes give an exact ceiling. Here, 1 KB = 1,024 bytes and 1 MB = 1,048,576 bytes.
Choose low, medium, or high quality, or fit the PDF under a target size.
Compress image-heavy PDFs for email and uploads.
Aim for common size limits like 500KB or 1MB with clear best-effort messaging.
Preview how much size you saved before downloading.
Clear messaging helps you pick the right compression level.
Every page is rasterized. Searchable text, links, forms, bookmarks, tags, and digital signatures are not preserved.
Scanned PDFs often contain large page images, so compression can reduce their size a lot. Text-heavy PDFs already store content efficiently, so they may change less.
If the file stays above your target, remove unneeded pages, split the document into smaller parts, or export the most important section first. The tool already gives you the smallest result from the current pass when possible.
For specific caps, start with Compress PDF to 500KB or Compress PDF to 1MB. For email and upload guidance, read our PDF size-limit guide.
Check the supported formats and settings for your task. If the result isn’t what you expected, our support page can help you find the next step.