You've got six tabs open, a Slack thread blowing up, and three PDFs that need to become one. The last thing you want is to download another app, sign up for another service, or wait for files to upload to a server that may or may not exist tomorrow.
Merging in the browser is the right answer here. Flint does it without leaving the tab.
How browser merging actually works
Modern browsers can do nearly everything desktop software can. Flint loads the PDF engine into your browser when the page opens, then uses it to read, combine, and re-serialise your files. The result is a real PDF — same format, same structure, same compatibility — produced without a single request to a server.
Pick your files three ways
Drag them onto the page. Click Add files and use the picker. Or paste from clipboard if you've copied a PDF (yes, that works). On merge PDF, thumbnails appear instantly. Reorder by dragging. Drop more files in at any point. The interface stays out of your way.
Works in every browser
Chrome, Edge, Safari, Firefox, Brave, Arc, Opera. Mobile Safari, Chrome on Android. If your browser was updated in the last two years, it works. Flint doesn't depend on any browser-specific feature for the merge itself — it's all standards-based.
What about really large files?
Browsers can handle PDFs up to a few hundred megabytes without breaking a sweat. If you're combining a 600MB scanned book with a 200MB photo album, consider compressing first. For anything under that, the browser is faster than any cloud service because there's no upload step.
FAQ
Why no upload progress bar?
There's nothing to upload. The merge happens on your device. The only thing that downloads is the finished PDF.
Do I need to be online?
Just to load the page initially. The merge itself doesn't need a network connection.
What about privacy?
Your files don't leave your browser. We can't see them, store them, or accidentally leak them — they were never on our infrastructure.
Is there a file count limit?
Practically, no. Browser memory caps the upper bound. 20-30 typical PDFs is comfortable. 100+ is fine for smaller files.
Open a tab, drop your files, get your merged PDF. Merge in the browser.