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PDF Compressor Online Privately
Shrink PDF document size by optimizing internal object streams and cross-reference tables locally without cloud uploads.
PDF Compressor
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How Client-Side PDF Compression Works
PDFs generated by software like Microsoft Word, Adobe InDesign, or scanners often contain uncompressed font subsets, bloated cross-reference tables (XREFs), and unoptimized stream objects.
ToolMint inspects the PDF internal DOM using WebAssembly, compresses raw object streams with Deflate algorithms, and reconstructs an optimized PDF structure — all directly in your browser.
Frequently Asked Questions
How does ToolMint compress PDF files without uploading?
ToolMint parses and restructures PDF object streams locally using WebAssembly and PDFLib, re-encoding document streams using optimal Deflate compression.
Will my confidential PDF contents stay private?
Yes. All computations execute locally on your machine. Your documents are never uploaded to any remote server or stored in the cloud.