Why big PDFs get rejected everywhere
When a compressor says “file too large, maximum 100 MB”, the limit is not about PDFs at all — it's about their upload pipeline. Your file has to travel to their servers, sit in their storage and wait in their processing queue. All of that costs money, so free tiers get capped.
PDF Any Size skips the upload entirely: the compression engine (built on Mozilla's PDF.js) runs inside your browser tab. The file goes from your disk to your browser's memory and back to your disk. That's why there is no limit — and why it works even offline.
What size should you expect?
| Original | Strong preset | Balanced | High quality |
|---|---|---|---|
| 50 MB deck | ~1–2 MB | ~3 MB | ~7 MB |
| 200 MB deck | ~4–7 MB | ~8–15 MB | ~20–30 MB |
| 1 GB scan/deck | ~20–40 MB | ~50–80 MB | ~100+ MB |
Design-tool exports compress best, because most of their weight is redundant full-resolution PNGs. Already-optimized PDFs (e.g. ebooks) shrink less.
Three tips for very large files
- Keep the tab in the foreground. Browsers slow background tabs down; processing is fastest while you watch it.
- Start with the Strong preset. Check the result — if a page looks too soft, re-run with Balanced. Each run takes only a minute or two.
- Free up memory for 500 MB+ files: close other heavy tabs and apps first.
FAQ
Why do most PDF compressors reject files over 100 MB?
Because they process files on their servers, every file must first be uploaded — and uploads are capped by their infrastructure (proxies, storage, timeouts). PDF Any Size compresses locally in your browser, so no upload and no cap exist.
How long does a 200 MB PDF take?
Usually 1–3 minutes depending on your computer and the number of pages. The first page takes the longest because the browser unpacks all embedded images; the rest go much faster.
Can I compress a 1 GB or 2 GB PDF?
Yes, as long as your computer has enough memory to open it. There is no artificial cutoff. For very large files, close other heavy tabs first and keep the tab in the foreground for maximum speed.
Will the quality be acceptable?
For screen viewing and email, yes — the Balanced preset at 150 DPI looks sharp on any display. If the PDF must be printed, use the High quality preset (200 DPI).