How to use this PDF tool
- Select one pdf.
- Choose the processing option that fits your task.
- Select “Analyze stream sizes” and wait for the progress bar.
- Review the statistics, then download the newly generated result.
Home › PDF Compression & Optimization › PDF Stream Size Analyzer
PDF Stream Size Analyzer
Find which encoded streams occupy the most space in a PDF. The CSV report ranks streams and shows nearby filter declarations where available.
PDF Tool One PDF
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What this tool does
Measure encoded PDF stream lengths, identify declared filters, rank the largest streams, and download a CSV stream-size inventory locally.
Raw byte positions between stream and endstream markers are measured. Sizes reflect encoded storage, not expanded memory use.
Malformed files or the word “stream” inside unusual binary data can affect byte-level estimates.
Supported formats and limits
| Input | One PDF |
|---|---|
| Output | JSON or CSV report |
| Processing | Local browser session |
| Limits | Available browser memory and canvas size |
Tips for better results
- Start optimization with the largest image-like streams.
- Filter names help distinguish JPEG data from general compressed content.
- Compare totals with file size; dictionaries and cross-reference data add overhead.
FAQ
Does pdf stream size analyzer upload my files?
No. Processing runs in this browser. The page does not send the selected file to a Callpdf server.
Can this tool process a password-protected PDF?
PDFs that require a password are not supported in this version. Remove protection with the correct password before using the tool.
What happens with a very large PDF?
Large documents may use substantial memory and can take longer. Close other heavy tabs and try a smaller file or fewer pages if the browser stops.
Will the output preserve every advanced PDF feature?
The report does not alter the PDF. Its measurements are a practical browser-based inspection and documented limitations still apply.
Which browsers work best for pdf stream size analyzer?
A current desktop version of Chrome, Edge, Firefox, or Safari is recommended. Browser memory limits vary by device.
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Privacy and processing
| Upload | None |
|---|---|
| Storage | Current browser tab only |
| Reset | Revokes generated download URL |