Combine several PDFs into one filing packet
Quick answer
Upload the PDFs in the order you want them, and Filly merges them into a single file you can download or send for signature. Built for filing packets — a form plus its exhibits and supporting evidence — rather than one-off document juggling.
When you’d use this
A USCIS packet with evidence behind it
The petition, the supporting affidavits, the scanned identity documents and the fee sheet all have to arrive as one ordered submission. Merge them once, in the order the checklist specifies, instead of stapling PDFs together in a viewer.
A tax return plus its attachments
Schedules, statements and a signed authorisation form usually start life as separate downloads. Combine them into the single file a client or an agency portal will accept.
A contract and its exhibits
Agreement, schedule of fees, and annexes — merged in order so the page numbering and cross-references still make sense to whoever reads it.
How to do it
- 1Open the PDF tools and choose Merge.
- 2Select two or more PDFs — the order you pick them is the order they are combined.
- 3Run the merge and download the single combined PDF.
- 4Optionally add page numbers afterwards so the packet is paginated end to end.
What it doesn’t do
Merging keeps each source page exactly as it is — it does not re-flow text, re-number existing page footers, or reconcile a table of contents. If two source files each carry their own page numbers, add fresh numbering afterwards.
Frequently asked questions
How do I combine several PDFs into one file?
Open Filly's PDF tools, choose Merge, select the PDFs in the order you want them, and run it. You get back one combined PDF. It runs in the browser with nothing to install, and the free plan covers it.
Does merging change the pages themselves?
No. Each page is carried across exactly as it was, so signatures, form fields that were already flattened, and scanned images are unaffected. Only the order and the container change.
Can I number the pages of the merged packet?
Yes — run the page-numbering tool on the merged file afterwards. That stamps a continuous "1 / N" across the whole packet, which is what most agencies and courts expect from a combined filing.
The tools are the side of it
Filly is a form filler first: save a client’s details once and every form you upload afterwards fills itself from that profile. These PDF tools exist because the paperwork around a filing needs assembling before and after it’s filled.
- Free plan — 10 forms, 5 clients, 10 fills a month, no card
- Reads any PDF or DOCX, including scans via OCR
- 18 official IRS, USCIS and SSA forms built in