Aim for a PDF size ceiling such as 100 KB or 500 KB with bounded local raster compression and honest quality trade-offs.
Runs locallyNo uploadYou control saved copies
The worker tests bounded DPI and JPEG-quality candidates, keeps the page count and checks that the output PDF opens. The original is returned unchanged if it already fits or no smaller copy is produced. Any rasterized copy still needs your visual review, including small text, form values and comments.
Local raster worker · no upload · cancellable
The raster worker tests bounded page resolutions and JPEG qualities, keeping the clearest candidate at or below your requested byte ceiling when safely possible.
The original bytes are returned unchanged if they already fit the ceiling or no smaller candidate is produced. Compressed copies rebuild pages as images; selectable text, forms, links, signatures and accessibility structure can be removed.
The target is a ceiling, not exact byte equality. If it is not met, a smaller candidate may be offered above the ceiling; otherwise the original is preserved. Review the target status and compare every required page with the original before using a rasterized copy.
Highly detailed or long PDFs may not remain readable at very small targets. Reduce pages or choose a larger ceiling when possible.
This compressor works toward a file-size ceiling. If the original already fits, it returns the original bytes after checking its page count. Otherwise, it renders pages into images and tries bounded resolutions and JPG qualities. If no smaller copy is produced, it preserves the original instead of offering a larger file.
Rendering replaces text, form controls, links and accessibility structure with flat page images. Keep the source and decide whether that trade-off suits the destination. A small readable attachment and an editable or accessible document may require different workflows.
| Your situation | Recommended approach |
|---|---|
| The original already meets the upload ceiling | Use the original or verify the pass-through result. Raster compression is unnecessary when the file already meets the requirement. |
| A strict ceiling matters more than interactivity | Enter the permitted maximum and review the image-only acknowledgement. Check small text and the target status in the actual result. |
| Small type needs the clearest available attempt | Start with Up to 150 DPI. It is a maximum candidate setting, not a guarantee: lower resolutions may be tried to pursue the size target. |
| The target cannot fit a long document legibly | Split or extract relevant pages if the recipient permits separate files, or request a larger ceiling. Do not remove required content merely to make a number smaller. |
The compression-example.pdf sample contains one A4 page with a synthetic raster and a text title. Its source is above 200 KB so this exercise uses raster compression rather than the already-fits path.
Expected result. The larger sample takes the raster path, producing a one-page image-based PDF. The result states whether it met 200 KB, which here means 204,800 bytes. The title may remain visible while no longer being selectable text.
None of the bounded resolution and JPG-quality candidates met the requested ceiling within the tool's constraints.
Try this: A smaller candidate or the unchanged original may be available, but neither is target-compliant. Increase the ceiling if allowed or split the document into files with fewer pages when the destination accepts separate files.
The tested candidates did not reduce the original file size. Efficient digital PDFs can grow when their text and artwork are rebuilt as page images.
Try this: Download the unchanged original if it suits your destination. The requested target was not met; consider a higher permitted ceiling or fewer pages per file rather than accepting a larger rasterized copy.
Raster compression replaces the original document objects with page images.
Try this: Return to the original if those features are essential. A later OCR step can add approximate searchable text, but cannot restore the original forms, links or accessibility structure.
A tight ceiling can require reduced resolution and lossy encoding. The page-pixel safety cap can also lower effective resolution on large pages.
Try this: Try a larger ceiling or retain the source. Inspect small lettering at its intended display or print size rather than judging only a thumbnail.
The input was at or below the requested byte ceiling, so its bytes were returned without rebuilding the pages.
Try this: Check the file size and use that copy if it meets your requirement. This result has not demonstrated raster compression or removal of document features.
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Maintained by Shakti Prasad Ram. Found a mismatch? Report the tool, browser and steps without sending a sensitive document. Back to the tool