Lossless PDF Stream Compressor
Inspect encoded image, embedded-font and vector/content stream sizes, then try lossless Flate compression at level 9, removal of unreachable objects and sharing of byte-identical font programs with matching dictionaries. Different glyph subsets are not merged; images are not resampled and text stays vector-based.
About this lossless pdf stream compressor
Inspect encoded image, embedded-font and vector/content stream sizes, then try lossless Flate compression at level 9, removal of unreachable objects and sharing of byte-identical font programs with matching dictionaries. Different glyph subsets are not merged; images are not resampled and text stays vector-based Parses and structures office document payloads locally in memory without transmitting private company files to external servers.
Document parsing & data extraction pipeline
Performs non-destructive manipulation of Portable Document Format (PDF) binary object streams in accordance with ISO 32000-1 and ISO 32000-2 (PDF 2.0). Operates on underlying PDF cross-reference tables (XRef), catalog dictionaries, page trees (/Pages), and content streams via pdf-lib and PDF.js. Implements symmetrical margin cropping based on existing CropBox / MediaBox origin coordinates [x, y], executes 90-degree page rotations, merges/splits page trees, and preserves AcroForm interactive form fields, annotations, and bookmarks.
Worked document extraction example
Scenario: Execute Lossless PDF Stream Compressor with sample data to verify transformation accuracy and output formatting.
Sample input:
Processing: After the page loads, processing runs locally in a Worker without uploading the file. Cancel or clear stops the task.
Illustrative output:
File size & structure constraints
Input must be smaller than 150,000,000 bytes. Limits: 10,000 pages, 100,000 objects, 500,000 graph steps, 32,000,000 decoded bytes per stream, 256,000,000 decoded bytes overall, and 30 seconds including reading. Streams exceeding decoding budgets are retained; document limits reject the result. Encrypted PDFs and signature markers are rejected; signatures are not cryptographically validated. Unknown filters, external streams and undecodable streams are retained. A rewrite does not preserve old incremental revision bytes or linearization. No guaranteed size reduction, target size, full PDF/A or PDF/X certification, or acceptance by government or job portals. Native PDF applications, physical printing and external submissions have not been tested.
Lossless PDF Stream Compressor parses structured OpenXML and PDF data locally. Review exported tables or sheets against original files.
Zero-upload document security boundary
File buffers and document assets in Lossless PDF Stream Compressor are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
Document schemas & interchange standards
ECMA-376 Office Open XML specifications and ISO 32000 PDF reference standards:
- Scoped PDF stream preservation and lossless Flate rewrite; not full PDF/A or PDF/X certification
Lossless PDF Stream Compressor verification · Audit standards
How to use it
- Choose a local PDF
- Process locally / Input composition / Output composition
- Download PDF / Download complete JSON report
Frequently asked questions
What does the Lossless PDF Stream Compressor produce?+
The charts count encoded stream payloads once. Other includes dictionaries, object/xref containers, history, orphans and unclassified bytes; the four categories sum to the actual file size. This is not an exact semantic allocation inside compressed object containers.
What limits and privacy rules apply?+
Boundary constraints concerning "What limits and privacy rules apply?" prevent invalid parameter state mutations client-side.
Which formats and interoperability limits apply?+
Runtime handling of "Which formats and interoperability limits apply?" executes synchronously in your browser tab without remote delays.
Can I run a local example?+
Download example PDF /examples/pdf-compression.pdf; 89,381 → 44,852 bytes.