Merge PDF Files
Documents are read into memory and combined locally. Nothing is uploaded.
Combine several PDFs into a single document. Drag files into the order you want, then merge — the whole operation runs offline in your browser.
Order matters more than you think
Pages are appended in the order the files appear in the list, so a merged document is only as sensible as the sequence you set. Use the arrows to reorder before merging — there is no page-level rearranging afterwards without going back to a full PDF editor.
Files sorted by name in your file manager do not necessarily arrive in that
order, particularly when names mix numbers and text: scan2
often lands after scan10. Check the list before you press
merge.
What is preserved
- Kept: text and its searchability, embedded fonts, vector graphics, image resolution, links within a page, annotations
- Rebuilt: the page tree and document metadata
- Lost: bookmarks and outlines from the source files, cross-document links, and any encryption
If bookmarks matter for a long merged report, add them afterwards in a PDF editor — no browser-based merge tool preserves them reliably.
Frequently asked questions
Are my PDFs uploaded to a server?
No. The merge runs in your browser using a JavaScript PDF library loaded with the page. Your documents are read into memory, combined, and handed back as a download. Nothing crosses the network, which matters when the files are contracts, invoices or medical records.
Is there a file size or page limit?
The only limit is your device's memory, since every document has to be held in RAM at once. In practice a few hundred megabytes of PDFs merge without trouble on a normal laptop. Very large scanned documents are the usual thing to watch — those can be hundreds of megabytes each.
Does merging reduce quality or re-compress anything?
No. Pages are copied across as they are, with their existing fonts, images and vector content intact. A merged PDF is normally close to the sum of the input sizes, and text stays selectable and searchable because nothing is rasterised.
Can I merge password-protected PDFs?
Encrypted files have to be unlocked first — the library cannot read a document it has no key for. Open the PDF in a reader, remove the password or export an unprotected copy, then merge that. Form fields and annotations from unencrypted files are carried over.
Related tools
- CSV to JSON ConverterConvert CSV or TSV into JSON with correct handling of quoted fields, embedded commas and type detection.
- Base64 Encoder & DecoderEncode and decode Base64 text, and turn any file into a Base64 data URI for embedding.
- Image ConverterConvert PNG, JPG, WebP and AVIF in your browser. Batch convert, control quality, nothing is uploaded.