🧹 Remove Unused Objects WASM
Clean up orphaned objects, hidden structures, and leftover bloat from your PDF. Rebuild it smaller, cleaner, and faster — without touching how it looks.
Upload PDF
Drop your PDF below — everything runs locally, nothing is uploaded.
Drop your PDF here or click to browse
Only .pdf files • Works offline • Your file never leaves this device
document.pdf
—
Preview (page 1)
Your PDF will look identical after cleanup — this is just a sanity check.
How to Remove Unused Objects from a PDF
Upload Your PDF
Drop your file — it stays entirely on your device.
Choose What to Clean
Pick a preset, or toggle individual cleanup rules.
Download
See how many objects were removed, then download the cleaned PDF.
Frequently Asked Questions
Every PDF is made of many small objects — pages, fonts, images, annotations, metadata entries, and so on. They're referenced by an object graph starting from a document catalog. When software edits a PDF (adding pages, deleting content, adding signatures), some objects can be disconnected from the graph but remain in the file. They take up space, slow down parsing, and can leak metadata. Removing them cleans the file.
It rebuilds the PDF from scratch by walking the live object graph starting from the catalog. Anything reachable (pages, their resources, fonts, images, referenced annotations) is copied forward. Anything not reachable is dropped. This is the same technique qpdf and mutool clean use — implemented in JavaScript with pdf-lib.
Yes. Only hidden, unreferenced structures are removed. Text, images, fonts, layout, links, and page count all stay the same. The only visual difference might be if you choose to remove annotations or the structure tree — both of which are optional and off by default on the Recommended preset.
Sometimes — if the corruption is limited to unreachable objects or bad references. But rebuilding often fails on badly damaged files. For dedicated repair, use our Repair PDF tool, which uses a more permissive loading path.
Both rebuild the PDF. Linearize focuses on reordering the file for fast first-page loading on the web. Remove Unused Objects focuses on eliminating orphaned and hidden structure to reduce size. They overlap, but each tool has clearer options for its specific purpose. You can run both — the order doesn't matter much.
No. Everything runs in your browser using pdf.js and pdf-lib. Your file never leaves your device. You can even run this tool offline after the page has loaded once.
Rare but possible — some PDFs are already minimal, and rebuilding can add a small amount of structural overhead. When that happens, we detect it, tell you, and offer the original file for download instead.