Compress PDF files online.
Reduce PDF file size for email, forms and upload limits, with an optional exact maximum size target in KB.
Reduce PDF size without installing software
Large PDFs can be rejected by application portals, email attachments and document upload forms. SizeFix compresses image-heavy PDF pages into a smaller copy directly from the browser so you can retry the upload quickly.
Target a specific maximum size
If a portal requires a PDF below a particular limit, enter the maximum size in KB. SizeFix will make several compression passes, progressively lowering image quality and resolution until the target is reached or further reduction would be too aggressive. Very small limits may be impossible for long documents, so the tool reports clearly when the target cannot be reached.
PDF compression FAQs
How do I make a PDF smaller?
Choose your PDF, enter a target size if needed, select a starting quality and let SizeFix generate a smaller copy.
Can I compress a PDF to a specific KB size?
Yes. Enter the maximum KB target. SizeFix will attempt multiple compression passes and tell you whether the target was met.
Does compression keep selectable text?
The current compressor rasterises pages for reliable size reduction on image-heavy PDFs, so selectable text may become image content in the compressed copy.