Flint PDF

Merge PDF Files Online

Combine multiple PDFs into a single document.

  • Browser-based — no install
  • Files private to your account
  • Up to 250 MB on Pro

Flint's Merge PDF tool joins two or more PDFs into a single document, in the exact order you choose. Drop your files into the browser, drag the thumbnails into place, and confirm the result before it lands in the editor. Everything runs locally, so your documents stay on your machine until you decide to export.

How it works

Right in your browser, no install

Flint PDF runs entirely in your browser. Drop a file in, do the thing, get the file out.

  1. 1

    Upload your PDFs

    Drop two or more PDF files into the wizard, or pick them from your documents. There's no fixed limit on how many you can add.

  2. 2

    Drag to reorder

    Use the thumbnail strip to put the files in the order you want. Page previews make it easy to confirm what's about to be combined.

  3. 3

    Combine into one

    Flint merges the PDFs into a single document and opens it in the editor for any further edits.

  4. 4

    Export when ready

    Keep editing, or download the merged PDF with a Pro plan when you're done.

What it's for

Built for real work

Build a single client packet

Combine contracts, invoices, and supporting documents into one tidy PDF before sending it on.

Assemble a report

Stitch a cover page, body, and appendices together so the finished report reads as one continuous file.

Bundle scanned pages

Merge separate scans from your phone or scanner into a single archive-ready PDF.

FAQ

Frequently asked questions

Is Flint's merge tool free?
You can try the merge tool free in the browser. A Pro plan is required to download or export the merged PDF.
Are my PDFs private?
Yes. Merging happens locally in your browser — your files are never uploaded to a third-party server for processing.
Do I need to install anything?
No. Flint runs entirely in a modern web browser. There's nothing to install, sign up for, or download to get started.
What's the maximum file size I can merge?
Pro accounts support PDFs up to 250MB each. The total combined size depends on your device's available memory.
Can I reorder pages within a file before merging?
Yes. Use Flint's Reorder Pages tool on individual PDFs first, then bring them into the merge wizard in the order you want.
How many PDFs can I combine at once?
There's no hard cap. Most users combine a handful at a time, but Flint will happily merge a dozen or more if your browser has the memory.

More from Flint PDF

More PDF tools

Built browser-side, share the same editor.

Edit

Change what's on the page.

Organize

Rearrange or combine pages and files.

Export

Optimize or convert for sharing.

Merge PDF Online — Combine PDF Files in Order | Flint — Flint PDF