Compress PDF to 100KB Online
Compress PDF documents to 100KB in your browser. Downsample raster content to 72 DPI and strip unused font glyphs. Zero server upload, 100% private.
Instant client-side compression · Up to 2 GB per file · Zero server upload
Technical Architecture & In-Browser Processing
Shrinking a PDF document below 100KB requires aggressive structural optimization while preserving text legibility. Our client-side WebAssembly PDF engine parses the document cross-reference table, removing orphan objects, embedded XML metadata, thumbnail streams, and redundant color spaces. Embedded TrueType and OpenType fonts are surgically subsetted so only glyphs actually present in the text remain. Any high-resolution color artwork is downsampled to 72 DPI using Flate predictor compression, allowing single-page forms, receipts, and invoices to easily fit within strict upload limits.
Achieving a 100KB footprint requires parsing the cross-reference table and removing duplicate font descriptor dictionaries. FitSize retains vector Bézier curves for all text outlines and technical schematics, eliminating redundant metadata while keeping AcroForm interactive form fields fully functional for government submission.
Frequently Asked Questions
Can a multi-page PDF fit under 100KB?
Single-page forms, text documents, and simple invoices compress cleanly under 100KB. Multi-page PDFs with photos may require downsampling to 72 DPI.
Will text remain selectable and searchable?
Yes. Text layers and font tables are preserved during vector deduplication, ensuring full searchability in PDF readers.
Are my financial documents uploaded to a server?
No. FitSize operates entirely in your browser using WebAssembly. No files ever leave your device.