Twenty receipts. Fifteen invoices. A folder of expense reports the finance team wants as a single PDF by Friday.
Merging two PDFs is trivial. Merging 50, in the right order, with the right page boundaries — that's where most tools fall over. Flint's merge tool handles the lot in one pass.
Sort the files before uploading
The fastest merge is one that's already ordered. Rename your files with a numeric prefix — `01_receipt.pdf`, `02_receipt.pdf` — and your file manager sorts them automatically.
Drop the whole sorted set into the merge tool. They land in the order you uploaded them.
Fine-tune the order
Drag thumbnails to reorder if you got it wrong. For sets where the order doesn't matter (a folder of independent receipts), skip this step entirely.
If you want a cover page in front of the lot, drop it first. If you want a back cover, drop it last.
Compress the result
Fifty receipts can easily merge into a 60 MB file. Run the merged PDF through Flint's compressor afterwards — for receipt-style content, you'll typically cut size by 70-80%.
If you'll be storing this long-term, also consider adding metadata so the archive is searchable.
FAQ
How many PDFs can I merge at once?
Dozens — browsers handle the merge locally so the limit is your machine's memory, not a server cap. For 100+ files, do it in batches and merge the batches.
Will bookmarks from the originals be kept?
Bookmarks are preserved where the source PDFs have them. The merged document inherits each file's bookmark tree, with each set nested under its source.
Can I merge PDFs and images in one go?
Convert images to PDF first, then merge the lot. Easy way to combine a contract with photo evidence.
What's the right order for merged invoices?
Chronological if they're for an audit. Vendor-grouped if they're for reconciliation. Whatever you choose, be consistent across the batch.
Batch merging is mostly about discipline before the upload. Sort, drop into the merge tool, check, save. One file, one pass.