You have a PDF that is too big — an email system rejected it, a form upload capped the file size, or a scanned document turned into a file far heavier than its page count suggests. Compressing a PDF means re-encoding its images and content so the same document takes less space, ideally without anyone noticing a difference. This guide starts with an honest answer about the free tool this site covers, then points you to the tools that actually do this job.
What PDF Arranger can and cannot do here
PDF Arranger has no compression feature. There is no compress or optimize command in the program, and no setting that re-encodes a document to a smaller size. That is not a hidden menu you have missed — compression is simply outside what this page organizer is built to do, and any guide claiming PDF Arranger compresses PDFs is describing a different program.
Two things PDF Arranger can do sometimes make a file smaller as a side effect, and they deserve honest labels. First, page-level cleanup: deleting duplicate or blank pages, or splitting a document so you only send the pages someone needs, genuinely reduces size — because there is less document left. Second, exporting pages as PNG or JPEG images, or exporting a rasterized PDF, changes the file size because every page becomes a picture. That can shrink a file, but it can also make it larger, and it always costs you something: the text stops being text, so it can no longer be searched, selected or read aloud, and fine detail softens. Rasterizing is not compression, and we do not present it as a compression workaround — at most it is a last resort for a document you only ever intend to look at.
Tools that actually compress PDFs
If you need real compression — smaller file, text still text, quality under your control — use a tool built for it:
- PDF2Go (online) — a browser-based toolbox with a dedicated PDF compression tool, handy for a one-off file when installing software is more trouble than the task. Try PDF2Go (sponsored). Remember that an online tool means uploading your document to someone else’s server, so keep contracts, ID scans and other sensitive files off online compressors.
- Adobe Acrobat (desktop) — Acrobat’s optimizer gives the most control: image resolution, font handling and audit reports showing exactly where the bytes went. It is the right choice when compression is a recurring part of your work. See Adobe Acrobat (sponsored); Acrobat Pro is $19.99 per month on an annual plan billed monthly (US pricing, checked October 2026).
- PDFsam Visual (paid) — from the makers of the free PDFsam Basic, the paid Visual edition adds a compression tool for people who prefer a desktop program from an open-source-rooted project. It is sold on the official PDFsam site; this site has no affiliate relationship with PDFsam.
- Stirling-PDF (self-hosted) — if you compress files often and want them to stay on your own infrastructure, the self-hosted Stirling-PDF toolbox includes compression among its many tools. Our PDF Arranger vs Stirling-PDF comparison explains what running it involves.
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A practical order of attack
Start by asking why the file is big. Scanned documents are usually big because each page is a large image; text documents with a few embedded photos compress far less dramatically. Then delete pages you do not need in PDF Arranger — that part is free and lossless. If the file is still too large, run it through one of the compressors above, compare the result side by side at full zoom, and only replace your original once the compressed copy still reads cleanly. Keep the uncompressed original archived; compression settings that look fine on screen can disappoint in print.