Merge PDF files onlinefor forms, resumes, and office work
Combine PDF files, plus JPG, PNG, or WebP images, into one clean document. Reorder files with the arrow buttons before merging, then download — everything runs in your browser, with nothing uploaded to a server.
Combine resume, certificates, marksheets, and supporting files into one upload-ready PDF.
Merge assignment pages, screenshots, scanned notes, and study material in the right order.
Build one clean PDF from reports, invoices, signed pages, and document bundles.
Quick Tips
- Keep your most important file first, like your resume or cover page.
- Arrange marksheets, certificates, or annexures in the exact upload order required.
- Remove the password from any locked PDF before adding it — encrypted PDFs will fail to merge.
- After merging, use Compress PDF if the final file is too large for a portal.
What This Tool Actually Does
This merger combines PDF files and image files (JPG, PNG, WebP) into a single PDF using pdf-lib, running entirely in your browser. Existing PDF pages are copied over at their original size and orientation. Each image you add becomes its own new page, scaled to fit an A4-sized sheet with a small margin — that's a deliberate tradeoff so mixed batches of scans and documents come out looking consistent, not a limitation you need to work around manually.
Ordering is controlled with up/down arrow buttons on each file row rather than drag-and-drop, and the tool shows a live summary (file count, total pages, total size, PDF vs. image split) before you commit to merging.
How to Merge PDF Files Online
- Add your files. Open the merge tool above and drop in the PDF and/or image files you want to combine. PDF, JPG, PNG, and WebP are all accepted in the same batch.
- Check the summary. Review the file count, total pages, total size, and the PDF/image split shown above the file list.
- Reorder with the arrow buttons. Use the up and down arrows on each file row to set the exact order your resume, certificates, or scanned pages should appear in.
- Merge. Click Merge to combine everything into one PDF. Each image is placed on its own page, sized to fit an A4 page.
- Download. Click Download merged.pdf to save the combined file to your device.
Merge PDFs for Real Tasks, Not Just Files
Job Application Pack
Resume PDF first, then certificates and marksheets (PDF or scanned images), then ID proof — reorder with the arrows so the recipient sees them in the sequence the form asks for.
College Admission Pack
Combine the admission form pages, transcripts, marksheets, and category documents into one file before submission.
Assignment Submission
Merge exported notes with photographed homework pages saved as JPGs — each photo becomes its own page automatically.
Office Document Bundle
Build one final PDF from reports, invoices, and signed pages for a clean handoff, then compress it if the recipient's inbox has a size limit.
Common Mistakes
- Adding a password-protected PDF and expecting it to merge — it will fail until the password is removed.
- Not checking the file order before merging, then having to redo it after download.
- Assuming images keep their original page size — they're placed on new A4-sized pages instead.
- Merging dozens of very large scans on a low-memory phone and expecting desktop-level speed.
- Forgetting that bookmarks and form fields in source PDFs aren't guaranteed to carry over.
Best Practices & Expert Tips
- Unlock any encrypted PDF before adding it to the batch.
- Set the order once, review the summary bar, then merge — avoid re-merging repeatedly on a large batch.
- Convert HEIC or GIF images to JPG or PNG first, since those formats aren't accepted directly.
- Compress the merged PDF afterward if a portal enforces a size limit like 100KB.
- Download the result immediately — closing the tab clears the merged file from memory.
Troubleshooting
Merge fails with an error: check for a password-protected or corrupted PDF in the batch — remove it, merge the rest, then handle that file separately.
An image didn't get added to the list: the tool only accepts JPG, PNG, and WebP images directly — convert other formats first.
The merge is slow or the tab is unresponsive: large batches of high-resolution scans can strain a lower-memory device, since merging happens on your device, not a server. Try merging in smaller batches.
An image page looks smaller than expected: images are fit inside an A4 page with margins, so a very wide or very tall image will be scaled down to fit rather than filling the entire page edge-to-edge.
Why Use This PDF Merger
Mixes PDFs and images natively
No need to convert photos to PDF separately first — add them straight into the same merge.
Order control before you commit
Rearrange files with the arrow buttons and review the summary bar before creating the final PDF.
Private, browser-based processing
Merging runs in your browser using pdf-lib — your files are not sent to a remote merge queue.
No watermark, no signup
The final PDF stays clean with no branding added and no account required.
Privacy & Security
Your PDF and image files are merged locally in your browser using pdf-lib — nothing is uploaded to a server to complete the merge. This keeps resumes, certificates, admission forms, and government documents private while still producing one final PDF instantly.
Tool Limitations
- Password-protected PDFs must be unlocked before merging.
- Accepts JPG, PNG, and WebP images only — not GIF, BMP, TIFF, or HEIC.
- Images are placed on new A4-sized pages, not their original page dimensions.
- Bookmarks, form fields, and annotations from source PDFs may not carry over.
- Reordering is manual (up/down arrows), not drag-and-drop.
- No fixed file-count limit, but very large batches depend on your device's memory.
Why Trust This Page
This page is written and maintained by the thepdftools editorial team and is checked directly against the live merge tool's behavior — the feature list and limitations above match what the tool actually does, including how it handles encrypted PDFs and mixed image formats.
Best Next Step After Merging
If your merged PDF becomes too large for email or portal upload, the next step is usually compression. Most users merge first, then reduce the final file size before uploading.
Frequently Asked Questions
Can I merge PDF files without uploading them to a server?
Yes. Merging runs in your browser using the pdf-lib library — files are read and combined locally, and are not sent to a remote server to be merged.
Can I combine PDFs and images in the same merge?
Yes. You can mix PDF files with JPG, PNG, and WebP images in one merge. Each image becomes its own page in the final PDF.
What happens to an image's shape when it's added to the PDF?
Each image is placed on its own A4-sized page and scaled to fit within the page margins while keeping its original aspect ratio — it isn't stretched, but it also isn't kept at its native page size.
How do I control the order of the merged pages?
Use the up and down arrow buttons on each file in the list before merging. There is no drag-and-drop reordering — the arrows are the only way to move a file's position.
How many files can I merge at once?
There's no fixed file-count limit set by the tool. Since everything runs in your browser, the practical ceiling depends on your device's available memory rather than a server-side cap.
Is there a file size limit?
No server-side limit is enforced. Very large combined files (hundreds of megabytes across all files) may slow down or fail depending on your device's memory, since merging happens entirely client-side.
Can I merge a password-protected PDF?
No. The tool needs to open each PDF's contents to copy its pages, so encrypted or password-protected PDFs will fail to merge until you remove the password first.
Does merging add a watermark?
No. The output is a clean PDF with no watermark and no branding added to your document.
Can I remove a file after adding it, before merging?
Yes. Each file row has a remove button so you can drop a file from the batch without starting over.
What image formats can I include in a merge?
JPG, JPEG, PNG, and WebP. Other formats like GIF, BMP, TIFF, or HEIC are not accepted directly — convert them to one of the supported formats first.
Does the tool work offline once it's loaded?
The merge itself runs client-side after the page has loaded, but you need an internet connection to load the tool the first time.
Can I merge scanned pages that are individual image files?
Yes. Scanned pages saved as JPG or PNG images can be added alongside PDF files and will each become one page of the final document.
Will merging change the page size or orientation of my original PDFs?
No. PDF pages are copied as-is, keeping their original size and orientation. Only image files are placed onto new, uniformly sized A4 pages.
Why did my merge fail with an error?
The most common causes are a password-protected PDF, a corrupted file, or an image that failed to load. Remove the problematic file and try merging the rest, then investigate that file separately.
Can I use this to combine a resume with certificates for a job application?
Yes. Add your resume PDF first, then certificates, marksheets, or ID documents (as PDF or image files), reorder them with the arrows, and merge into one submission-ready PDF.
Can I use this for college admission document packs?
Yes. It's commonly used to combine an admission form, transcripts, marksheets, and category or ID documents into a single PDF before uploading to a portal.
What should I do if the merged PDF is too large for a portal?
Merge first, then run the result through a compressor. Use PDF Compress for general size reduction, or Compress PDF to 100KB if the portal enforces that specific limit.
Can I merge PDFs on mobile?
Yes, the tool works in modern mobile browsers, though very large batches of files may be slower to process on a phone than on a desktop.
Does the tool preserve PDF bookmarks or form fields?
Page content is copied, but interactive elements like bookmarks, form fields, or embedded annotations from the source PDFs are not guaranteed to carry over into the merged file.
Is my merged file saved anywhere after I close the tab?
No. The merged file exists only in your browser's memory for that session. Closing or refreshing the tab clears it — download it first if you want to keep it.