Compress PDF
Choose a compact re-save or an explicitly lossy rasterized size-reduction mode.
Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint. TOOLGRID measures tool usage, not the content you enter.
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Browser-basedWhat this tool does
Select one PDF, choose compact re-save, balanced raster, or smaller raster mode, then compare actual before-and-after sizes. Raster modes flatten each page to JPEG and discard searchable text, links, forms, signatures, and vector structure. Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint.
Processing runs in the current browser tab, so the practical limit is your device memory and browser support rather than a server quota.
What you can do with this tool
Run a browser-local compact re-save on a PDF with unoptimized internal data before deciding whether heavier compression is needed.
See whether a local object-stream re-save is enough before sending a document to an external compression service.
Some PDFs accumulate internal update data after edits. A compact re-save can reduce structural overhead without changing pages.
What to check before relying on the result
- Performance and maximum practical input size depend on browser memory, device speed, and the structure of the input.
- Review the generated result before replacing or publishing an original file.
How to use
- 1
Add the single PDF file you want to process.
- 2
Choose compact re-save for a non-rasterized rewrite, or a labeled raster mode when a flattened image-only document is acceptable.
- 3
Run the local operation and compare the actual size change.
- 4
Open the downloaded PDF to check page count, visual detail, links, forms, searchability, and signatures before sharing.
Use Cases
Run a browser-local compact re-save on a PDF with unoptimized internal data before deciding whether heavier compression is needed.
See whether a local object-stream re-save is enough before sending a document to an external compression service.
Some PDFs accumulate internal update data after edits. A compact re-save can reduce structural overhead without changing pages.
Compare the original and downloaded file sizes, then open the output locally to confirm appearance before sharing.
Use a labeled raster mode only when a smaller image-only copy is more important than searchable text, links, forms, signatures, and vector fidelity.
Tips & Tricks
This tool re-saves the document with compact object streams. PDFs that were created by older software or incremental saves may shrink more than already optimized files.
Balanced and smaller modes render pages as JPEG images. They are not lossless compression and should not be used for archival, signed, accessible, searchable, or interactive PDFs.
If the downloaded file is close to the original size, the PDF was likely already using compact internal storage.
After compressing, open the downloaded file and zoom in on any images, charts, forms, or signatures before sending it to clients or submitting officially.
FAQ
Is my PDF uploaded to a server during compression?
Compression runs in your browser. Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint.
How much can I reduce a PDF's file size?
There is no guaranteed reduction. Compact re-save depends on structure; raster modes depend on page complexity, render resolution, and JPEG quality and can still produce a larger file.
Will compression reduce visual quality?
Compact mode does not intentionally reduce visual quality. Balanced and smaller modes are explicitly lossy: they rasterize every page, reduce vector and text fidelity, and remove interactive or searchable structure.
Can I compress a PDF multiple times?
Repeated compact saves usually add little benefit. Repeating a raster mode can introduce more loss because each pass decodes and re-encodes page images. Always restart from the original.
How should I check PDF reader compatibility?
The output is a standard PDF, but compatibility is not guaranteed for every reader or malformed source. Test the result in the reader used by your audience.
Does compressing a PDF remove any content?
Compact mode does not intentionally rasterize or remove page content, but it rewrites the PDF and document-level structures may change. Raster modes replace each page with a JPEG image, discarding searchable text, links, forms, signatures, annotations, and vector structure even when the page still looks similar.
What's the smallest file size I can achieve?
The minimum achievable size depends on the content. The tool cannot compress a PDF smaller than the raw information it contains.
Can I compress a PDF with owner restrictions?
Encrypted PDFs and permission-restricted PDFs are not supported by the current browser engine. Use a trusted desktop PDF tool to create an unencrypted copy before compressing.
Useful next steps
Open a nearby browser tool when you need to validate, convert, or reuse the result.