Compressby vztool

PDF compressor online

Compress PDF online.
Ready to send.

Reduce PDF file size locally for free while keeping text and vectors. Set a KB or MB limit, optimize embedded images and download. No document upload or sign-up.

Local processing · No account needed

Choose a PDF to compress
Drop a file here or choose one from your device.

PDF · Up to 100 MiB · No signed or encrypted documents

Your file stays on your device.
See how compression works ↓

A smaller PDF, still a document

Optimize PDF structure and embedded images locally. Text, vectors and page content stay in the document; no whole-page rasterization is used.

Compress creates a separate output. Keep the original and check the result before sharing the smaller copy.

How to compress a PDF

  1. Choose your PDF

    Open a file and check its original size.

  2. Choose a target or quality

    Use a maximum file size for an upload requirement. Use quality mode when detail matters more than a particular number.

  3. Preview the result

    Compare the output and check the details that matter.

  4. Download the smaller copy

    Save the output when it looks right. Keep the source if you may edit it again.

Keep the document structure

Use 100% quality for structural optimization only, or a lower quality to recompress eligible images. PDF pages are not rebuilt as JPEGs. Complex documents should be reviewed after export.

Compress under an upload limit

Choose KB or MB, or use a common size preset. 1 MB equals 1,000 KB here. The target applies to each file in a batch; check the actual downloaded size before uploading elsewhere.

Set a maximum size and check the actual exported file. Some files are already efficient and cannot meet a very small limit without changing their content.

If the result is still too large, try a lower quality or keep the original.

Leave some room below the receiving service’s limit. Its current upload rules and any attachment overhead may affect what is accepted.

PDF compatibility

Signed, encrypted and XFA PDFs are rejected. PDF/A, PDF/UA, complex layers and unusual color spaces have not been certified. Review the output in your usual PDF reader.

PDF compression questions

Compression optimizes the document and its embedded images without turning whole pages into pictures. Check text, links and forms in the exported file.
The target is a maximum, not a guarantee. Structural optimization does not downsample images, so already optimized documents may change very little.
Signed, encrypted and XFA documents are not supported. Keep the original; rewriting a signed PDF can invalidate its signature.
The original is kept when the compressed PDF is larger. No pages or attachments are removed to reach a target.

Compression guides

Compress a scanned PDF

Keep searchable text and vectors

Prepare a PDF for submission

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