How to Batch-Process Multiple PDFs at Once

A practical workflow for compressing or converting a whole folder of PDFs without doing it one by one.

By The CrunchyPDF Team  ·  Published July 20, 2026  ·  ~6 min read

One PDF is easy. Forty of them — a folder of scanned invoices, a semester of lecture notes, a year of statements — is a different problem. Batch processing means running the same operation across many files without repeating every click by hand.

What "batch processing" means in a browser-based tool

Desktop software often batch-processes by running a background job queue that can take minutes or hours unattended. A browser-based tool works a little differently: because everything happens in the page you have open, "batch" generally means selecting multiple files at once and having the tool work through them one after another while the tab stays open, rather than truly running in the background.

Batch-compressing PDFs in CrunchyPDF

1. Open the Compress tool.
2. Click Choose Files and select multiple PDFs — hold Ctrl (Windows/Linux) or Cmd (Mac) while clicking to select several files in the picker, or drag a multi-file selection in.
3. Set your quality level once — it applies to every file in the batch.
4. Click Compress PDF. Each file is processed in sequence and downloads individually with the quality level noted in the filename.

What a realistic batch size looks like

There's no hard cap built into a browser-based tool the way there often is on upload-based services — but practical limits still exist, set by your device's memory and processing power rather than a company's server budget. A handful of typical office documents will fly through; dozens of large, high-resolution scans processed in one sitting will take proportionally longer and use more memory. If a very large batch seems to stall, splitting it into two or three smaller batches is a reasonable workaround.

Building a repeatable habit, not just a one-off batch

If you find yourself batch-compressing regularly — say, a monthly folder of scanned receipts — a little upstream discipline saves time downstream: scan at a sensible resolution to begin with (see why is my PDF so large?), keep a consistent naming convention so compressed outputs don't get mixed up with originals, and keep one uncompressed master copy per document in case you ever need the sharper version back.

Batch merging and splitting

Merge and Split aren't quite "batch" in the same sense — Merge combines many files into one, and Split divides one file into many — but both handle multiple files or multiple output ranges in a single pass. See our full guide to merging and splitting PDFs for the page-range syntax and step-by-step instructions.

Doing it privately, at scale

Batch operations often mean handling a whole folder of similar sensitive documents at once — a month of pay slips, a client's full case file. Because CrunchyPDF processes everything locally, batching ten files carries exactly the same privacy guarantee as processing one: nothing is ever uploaded, regardless of how many files you select.