How to merge PDF files
- Drop your PDFs above (or click to choose files). Every page appears instantly as a thumbnail.
- Arrange the pages. Drag them into any order — you can mix pages from different files, rotate them, or remove any you don't need.
- Click Merge, then Download. The combined PDF is built on your device and saved straight from your browser.
Merging without uploading
Most online PDF mergers work by uploading your documents to their servers. That's slow — you wait for the upload and the download — and it means your contracts, applications, and records pass through someone else's computer. Sleek PDF merges PDFs using your browser's own processing power. The result: it's faster on large files, it works on sensitive documents you're not allowed to upload, and it keeps working even with no connection.
Frequently asked questions
Is it really free, with no limits?
Yes. There are no daily caps, watermarks, file-count limits, or premium tiers. Because the merge happens on your own device, it costs us nothing when you use it — so there's nothing to charge for.
Are my PDFs uploaded anywhere?
No. The files are opened directly in your browser and never leave your device. You can confirm this in your browser's developer tools: open the Network tab while merging — no file data is transmitted.
Can I reorder or delete pages before merging?
Yes. Every page appears as a thumbnail. Drag pages into any order (or use the keyboard: focus a page, press Space, then arrow keys), rotate them, or remove the ones you don't need.
Is there a file size limit?
No imposed limit. Very large files are bounded only by your device's memory — above roughly 150MB we show a soft warning, and merging in smaller batches usually helps.
Does it work offline?
After your first visit, the tool can run without a connection — there is no server involved in processing.