Documents
PDF compressor
Try to reduce a PDF’s file size while keeping its text and pages intact. Processing stays in your browser, and results depend on the document.
Works locally in your browser
How this tool works
Try a conservative structural rewrite before sharing or archiving a PDF. The tool does not upload content and does not make unsupported percentage claims.
Inputs and definitions
Choose one PDF up to 100 MB, run safe optimization, compare original and output byte sizes, and download only if the result suits your needs.
Methodology
The parser opens the PDF and serializes it again with object streams. This can remove some structural overhead but deliberately avoids destructive page rasterization.
Assumptions
Safe mode prioritises preserving supported page content over aggressive reduction. Already optimised files commonly show little or no improvement.
Worked examples
Worked example
A valid one-page PDF is reopened after optimization and retains one page; the tool reports its exact before and after byte sizes.
Enter and review
Choose one PDF up to 100 MB, run safe optimization, compare original and output byte sizes, and download only if the result suits your needs.
Process locally
The parser opens the PDF and serializes it again with object streams. This can remove some structural overhead but deliberately avoids destructive page rasterization.
A valid one-page PDF is reopened after optimization and retains one page; the tool reports its exact before and after byte sizes.
Validation example
The same workflow is repeated with a second valid input to confirm pdf compressor behavior.
Enter and review
Choose one PDF up to 100 MB, run safe optimization, compare original and output byte sizes, and download only if the result suits your needs.
Process locally
The parser opens the PDF and serializes it again with object streams. This can remove some structural overhead but deliberately avoids destructive page rasterization.
The output remains local and follows the documented validation and limitation rules.
Limitations and common mistakes
Encrypted or malformed files are rejected. Safe mode does not recompress every embedded image or font, so it may produce no gain or a slightly larger file.
Frequently asked questions
Why is there no promised percentage?
PDF contents differ too much for an honest universal guarantee.
Does safe mode rasterize text?
No. It rewrites structure and keeps supported text and vectors.
Are PDFs uploaded?
No. Parsing and writing happen locally.
Sources
- PDF specification ISO 32000-2 — International Organization for Standardization (accessed )
Method and content record
The method, examples and limitations describe how this tool works. Recorded checks do not establish independent professional review.
Record attribution, date and versions
Record attribution: ToolsOrigin calculation review; introduction guidance checked by Codex.
Record date: .
Content version 1.0.1. Engine version 1.0.0.