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GigAI Tools

Merge PDF Files Online: Free & Private

Join two or more PDFs into one tidy document. Reorder pages by dragging, remove any file you don't need, and export in seconds. No uploads, no watermark.

100% browser processingFree · no sign-up
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What is the merge pdf?

GigAI Merge PDF combines documents in your browser using pdf-lib page copying - lossless, so text stays sharp and selectable, and the files are never transmitted to any server. Our benchmark merged two 6.6 MB PDFs in 1.0 second. No account, no page limit, no watermark - safe for contracts and anything confidential.

The GigAI PDF Merger stitches several PDFs into a single file without ever sending them to a server. Drop in your documents, drag them into the order you want, and the tool assembles one continuous PDF using pdf-lib, right inside your browser tab. It preserves the original page content, works with dozens of files at once, and never adds a watermark or a page limit. Because everything runs locally, merging is instant even for large reports, contracts or scanned bundles, and your files stay completely private.

Difficulty:
Easy
Typical time:
~15s
Processing:
100% browser processing

Last updated

How to use the merge pdf

  1. 1

    Add your PDFs

    Drag your PDF files onto the drop zone, or click to browse and select several at once. Add more at any time.

  2. 2

    Set the order

    Drag the files into the sequence you want, or use the up/down controls. Remove any file you added by mistake.

  3. 3

    Merge

    Hit Merge PDFs. The tool joins every file, in order, into one document: locally, in a moment, with no upload.

  4. 4

    Download

    Download your single combined PDF. Not quite right? Reorder and merge again: it's instant and unlimited.

What Merge PDF includes

  • Drag-to-order merging

    Arrange your files exactly how the final document should read. Drag rows or use the keyboard. The order you set is the order they're joined.

  • Unlimited files, no watermark

    Combine two PDFs or fifty. There's no file cap, no page limit and nothing stamped onto your output: just a clean, single document.

  • 100% in your browser

    Files are read and merged locally with pdf-lib. They're never uploaded, stored or seen by anyone: the privacy promise holds for every page.

  • Instant, even for big files

    No queue and no round-trip to a server. Assembly happens on your device, so large reports and scanned bundles merge in a moment.

  • Content preserved

    Text, images and vector graphics carry over intact. The merged PDF keeps each source page as-is, so nothing is re-rendered or degraded.

Why use our merge pdf

Private by design

Merging runs entirely inside your browser tab. Your documents never leave your device, so there's nothing for us to upload, store or read.

You control the order

Nothing is auto-arranged. Drag files into place, remove any you don't need, and preview the sequence before you export a single page.

Free with no catches

No account, no daily limit, no paywall and no watermark. Combine as many PDFs as you like, as often as you like, at no cost.

Works on any device

It's a normal web page. No install, plugin or app. Merge from a laptop, tablet or phone and get the exact same clean result.

Built for the way you work

From quick one-off fixes to daily workflows, see how people put this tool to use.

  • Professional

    Assemble a complete proposal

    Merge a cover letter, scope, pricing sheet and case studies into one polished PDF a client can read top-to-bottom in a single file.

  • Student

    Combine coursework into one submission

    Join separate chapters, appendices and the reference list into a single document that meets a one-file upload requirement.

  • Business

    Bundle invoices and receipts

    Pull a month of invoices, receipts and statements into one ordered PDF for accounting, expense claims or an audit trail.

Measured results

Numbers from running this exact tool against a fixed public sample, not marketing claims.

Sampletwo copies of the 6.6 MB image PDF
Result13.2 MB in → 13.2 MB out (lossless) in 1.0 second
Worth knowingpdf-lib page copy: merging never re-encodes or degrades pages.

Measured on 2026-08-22 using Chromium on an Apple-silicon MacBook Air, everything in-browser. Re-measured with each release. The harness and samples are part of this site's test suite.

What this tool does not do

Boundaries stated plainly, with the right tool for each neighbouring job.

  • It does not convert images to PDF first - do that, then merge. JPG to PDF does that.
  • It does not compress the combined file. Compress PDF does that.

Supported formats

Accepts PDF, and produces PDF, all processed locally in your browser.

Input formats
  • PDF
Output formats
  • PDF

Frequently asked questions

Use this in a workflow

See how the merge pdf fits into a step-by-step journey with related tools.

Assemble & publish a PDF

5 steps

Turn loose files into one clean, shareable PDF: convert sources, merge, compress, secure and page-number the result.

View the workflow

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JPG to PDF

Convert JPG, PNG and other images into a single PDF: reorder them, pick a page size, then download. Free, fast and fully in your browser.

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Rotate PDF

Turn PDF pages the right way up, rotate every page or just the sideways ones by 90°, 180° or 270°, then download. Free and 100% in your browser.

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Add Page Numbers to PDF

Stamp page numbers onto a PDF in your browser. Pick the corner, choose a bare number or a 'Page X of Y' label, set the start number, font size and margin, and skip a cover page. Real selectable text, nothing uploaded.

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Protect PDF

Add a password and AES encryption to any PDF so only people with the password can open it. Free, fast and completely in your browser.

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Use Merge PDF in your code

The same engine runs behind the free API: send files, get signed download links back, and everything is deleted after the retention you choose. 1,000 tasks a month, no card.

Also runs as a task inside a job - chain it with the other engines. See the recipes.

curl -X POST https://api.gigai.tools/v1/jobs \
  -H "Authorization: Bearer $GIGAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "tasks": {
    "in": { "operation": "import/url", "url": "https://example.com/input.pdf" },
    "in2": { "operation": "import/url", "url": "https://example.com/second.pdf" },
    "work": { "operation": "merge-pdf", "input": ["in", "in2"] },
    "out": { "operation": "export/url", "input": ["work"] }
  } }'

# then poll until finished and follow the export URL:
curl https://api.gigai.tools/v1/jobs/JOB_ID/wait -H "Authorization: Bearer $GIGAI_API_KEY"

Comparisons & guides

Go deeper on the concepts behind the merge pdf.

GigAI Tools vs iLovePDF: Which PDF Toolkit Should You Use?

Comparison

Both give you a complete set of PDF tools. The real difference is architectural: iLovePDF processes your file on its servers, GigAI processes it in your browser. Here's when each one is the right call.

Read the comparison

How to Merge PDF Files Into One (Free, No Upload)

Guide

Combine several PDFs into a single document in seconds: reorder pages, no software, no watermark. A step-by-step guide to merging PDF files in your browser.

Read the guide

How to Compress a PDF (Free, In Your Browser)

Guide

Shrink a large PDF in seconds. No software, no upload, no watermark. A simple step-by-step guide to reducing PDF file size while keeping it readable.

Read the guide

How to Add a Watermark to a PDF (Text or Image)

Guide

Stamp DRAFT, CONFIDENTIAL or your logo across every page of a PDF, control the opacity, angle and position. A quick, private, browser-based guide.

Read the guide

Guides & articles

Common problems, solved

Hit a snag? Here are quick fixes for the issues people run into most.

  • The pages ended up in the wrong order.

    The merge follows the file list top-to-bottom. Drag each file into place (or use the up/down arrows) before merging. The number on each row is its position in the final PDF.

  • One of my PDFs won't add or fails to merge.

    The file may be password-protected or corrupted. Unlock it first with our Unlock PDF tool, or re-save it from its source, then add it again.

  • The merged file is very large.

    Merging keeps every page's original data, so sizes add up, especially with scans. Run the result through our Compress PDF tool to shrink it without losing readability.

Get the most out of it

  • Name your files 1-cover, 2-body, 3-appendix before you drop them in: they'll sort naturally into the right order.

  • Add a short title or divider page between sections so the merged document is easy to navigate.

  • Merging scanned images? Convert them to PDF first with JPG to PDF, then combine them here for a cleaner result.

  • If the final PDF feels heavy, compress it afterwards. Merging preserves quality, so you can always slim it down later.

Keep exploring

Related tools

Problems we solve

Definitions

From the blog

Explore categories

Compare formats

By file type

Common tasks

Next steps

Your privacy is built in

Your PDFs are merged entirely in your browser with pdf-lib and never uploaded to any server. Nothing is stored, logged or shared, when you close the tab, every file is gone.

  • Runs in your browser
  • No uploads
  • Nothing stored

Ready to try the merge pdf?

Free, private and instant. Merge PDF runs right in your browser.

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