Batch compress multiple PDF files at once online free. Bulk PDF compressor reduces all files simultaneously. No signup required.
When you have a folder of PDFs that all need the same size reduction — a semester of scanned lecture notes, a quarter's worth of invoices, or a batch of contracts before archiving — compressing them one at a time wastes real time. PDF HUB 24's batch compressor applies the same compression settings to every file in a single upload, so 20 PDFs take the same number of clicks as one.
When to Batch Compress PDFs
Batch compression is built for volume, not one-off files:
- Compressing a full semester or year of scanned documents before archiving
- Reducing a batch of supplier invoices before uploading to accounting software
- Shrinking a folder of contracts before bulk email or cloud upload
- Preparing multiple reports for a shared drive with storage limits
- Compressing an entire photo-scanned book or manual, chapter by chapter
- Cleaning up a backlog of oversized PDFs cluttering local storage
How to Batch Compress PDFs: Step by Step
- Upload multiple files: Select or drag in as many PDFs as you need to compress — there's no one-at-a-time limit.
- Choose one compression level: Pick Low, Medium, or High compression — this setting applies identically to every file in the batch.
- Process all files at once: All files compress in parallel on our servers, so batch size doesn't multiply your wait time linearly.
- Download individually or as a ZIP: Grab each compressed file separately, or download the whole batch as one ZIP archive.
Frequently Asked Questions
Is there a limit to how many PDFs I can batch compress?
Most users compress 10-20 files per batch comfortably. For very large batches, we recommend splitting into 2 rounds for the fastest processing time.
Can I use different compression levels for different files in one batch?
Not in a single batch — one compression level applies to all files uploaded together. Run a second batch with a different setting if you need mixed levels.
Do I have to download every file separately?
No — you can download all compressed files together as a single ZIP archive, or grab them one at a time if you only need a few.