Embed File in PDF — PDF Attachments
Upload a PDF and embed up to 10 files inside it as attachments — Excel, CSV, XML, images, or any file type.
Step 1 — Base PDF
Drop your PDF hereTap to select a PDF
PDF only, up to 200MB
Step 2 — Files to embed
Upload your PDF first
How it works
- 1Upload your base PDF file
- 2Add up to 10 files of any type to embed inside it
- 3Click "Embed & Download" — processing happens entirely in your browser
What to do next
About Embed File in PDF
Embed File in PDF is a single-page tool for the common PDF document workflow task it is named after. Upload a PDF and embed up to 10 files inside it as attachments — Excel, CSV, XML, images, or any file type. The interface keeps the input on one side, the configurable options in the middle, and the result on the other side. Most jobs start and finish without any scrolling.
Embed File in PDF runs on the open-source pdf-lib JavaScript library — an open-source, well-audited engine that performs the PDF document workflow natively in the browser. It accepts PDF and produces output that opens in any standard PDF viewer. Per-run input is capped at 200 MB.
Embed File in PDF sees the most use from small-business owners sending invoices and HR teams handling onboarding documents, but the design is intentionally generic enough that you do not need a specialist background to get a good result. The defaults aim at the most common case so a first-time user can get the right output without changing any settings.
The execution model is straightforward: your file is bytes in the tab's memory, the engine reads those bytes, computes the result, and hands the result back to the browser. The transformation happens locally, which is why the tool keeps working when your network connection drops mid-job and why it produces the same result every run for the same input.
The right moment to reach for Embed File in PDF is when you have a focused PDF document workflow job that fits inside a browser tab. Open the page, drop in the file or paste your input, choose the options that matter, and the tool returns the result.
Once the engine finishes, `{name}-with-attachments.pdf` is offered as an immediate download. There is no preview gate, no email-wall, and no "register to download" intermediary — the file is yours the moment it is ready.
Constraints worth knowing about: inputs are capped at 200 MB to keep memory usage in a sensible range, one input is processed per run, and the tool must be loaded over HTTPS for the in-browser engine to work. These are properties of the architecture.
Embed File in PDF sits in a small group of related tools. Useful neighbours include Extract Embedded Files, PDF Metadata Editor, Flatten PDF, and PDF Inspector. They are designed to compose: the output of one is a sensible input to the next, so a multi-step task is usually a sequence of single-click operations.
The transformation in Embed File in PDF is deterministic — the same input plus the same options produces the same result every run. That predictability matters when the result has to match an upstream specification or be reproducible later.
Embed File in PDF is one example of a broader pattern: utility software increasingly works as single-page, client-side experiences. Every page in the catalog is shaped that way, which keeps each tool fast to load and easy to recommend in a single link.
Embed File in PDF runs as a regular web page, so there is no install step or permission grant before the first run. The page can be audited by viewing the source or by watching the developer-tools Network tab while a job runs.
Pro tip: Embed File in PDF works just as well in a private/incognito window as in a normal one, which is occasionally useful when you want zero browser-history footprint of the job. Another tip: if the tool ever feels slow, it is almost always because the browser tab is competing for CPU with another tab — pausing or closing the heavy ones gives the engine room to work.
When something goes wrong, the cause is usually one of three things: a malformed input, a browser that is out of memory, or a corporate proxy that is interfering with the page's static assets. The first two are easy to diagnose; the third typically requires asking your IT team to allow the open-source pdf-lib JavaScript library to load.
That is the whole tool. Use Embed File in PDF for as long as it stays useful to you, and if it does, the catalog has many more tools built the same way. Each applies the same single-purpose discipline, so the way you used this page transfers to the next one you try.
How it works
- 1Open Embed File in PDF in your browser. The page loads quickly and the tool is ready to use the moment it becomes interactive.
- 2Drop a PDF file onto the upload area, or click to pick one from your device.
- 3Adjust the options to match what you need. Sensible defaults cover the most common case, so you can usually skip this step.
- 4Hit the run button. the open-source pdf-lib JavaScript library does the work in your browser tab.
- 5Download the result as `{name}-with-attachments.pdf`. The file is generated in your browser and saved through your normal download flow.
- 6Repeat the process for additional inputs whenever you need to. The page stays loaded, so subsequent runs are quick.
Common use cases
- Extract a specific signed page from a long contract bundle using Embed File in PDF.
- Compress a marketing deck so the email send-out finishes in seconds.
- Reorder pages of a multi-chapter scan into the correct reading order.
- Lock a confidential document with a password before sharing externally.
- Add page numbers to a draft report before circulating it for review.
- Shrink a scanned study packet so it fits past an email gateway.
- Convert a bundle of flyers into a single archival PDF.
- Strip blank or test pages from a scanned document.
FAQ
What files can be embedded?
Any file type — spreadsheets, CSVs, XML, images, documents, PDFs, and more. Up to 10 files at once.
File size limits?
The base PDF can be up to 200MB. Each embedded file can be up to 50MB.
Does it change the PDF?
No — the visual pages, content, and formatting stay identical. Only the attachments panel gains the embedded files.
Private?
Yes — everything runs in your browser. No file ever leaves your device.
How do I extract embedded files?
Use the Extract Embedded Files tool, or open the PDF in a desktop PDF reader that exposes the attachments panel.
Can I embed a PDF inside another PDF?
Yes — embedding PDFs inside PDFs is fully supported.
Will Embed File in PDF ask me to pay to download the result?
Embed File in PDF is free to use. The processing runs in your browser, which keeps the per-user cost low enough that the tool can be offered openly. The download is the same file the engine produced — you can use it for as many runs as you need.
Which file formats does Embed File in PDF accept?
Embed File in PDF accepts PDF. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
How accessible is the Embed File in PDF interface?
Embed File in PDF uses native HTML controls wherever possible, which means keyboard navigation, focus rings, and screen-reader labels work the way the platform expects. The drop zone accepts files via the keyboard-accessible file picker as well as drag-and-drop, and result downloads use standard browser download flows. If you spot an accessibility gap, Favtoo treats it as a bug worth fixing.
Can I call Embed File in PDF from a script?
Embed File in PDF is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (the open-source pdf-lib JavaScript library) is open-source and can be used directly from your own code.
Will I notice a difference in the output from Embed File in PDF?
Embed File in PDF is built to preserve quality wherever the underlying PDF format allows it. Operations that are mathematically lossless (e.g. structural transformations, lossless re-encoding) round-trip with no perceptible change. Operations that involve a lossy codec inevitably introduce small artefacts at the byte level, but the defaults aim at the sweet spot where output looks or sounds the same to a normal viewer or listener while still being meaningfully smaller or faster than the input.
What should I do if Embed File in PDF fails on my file?
Failures usually fall into one of three buckets: the input is in an unsupported format, the input is over the size cap, or the input is structurally malformed (a truncated download, a partial export, or a stream the engine does not recognise). The first two are easy to confirm — check that your file is one of PDF and that it is below 200 MB. For the third, opening the file in its native viewer first is the fastest way to confirm the source is intact.
Is Embed File in PDF licensed for business use?
Embed File in PDF can be used for personal and commercial work alike — there is no separate "business" licence to purchase. The output you generate is yours to use however you want, including in client deliverables, internal documents, or commercial products. Favtoo's only ask is fair, individual use; the tool is not designed to be embedded as a backend service or wrapped behind an API for resale.
Does Embed File in PDF support batch processing?
Embed File in PDF processes one input at a time by design — it keeps memory usage predictable on lower-end devices and makes results easier to verify. To handle a folder, run the tool once per file; the page stays loaded between runs and remembers your last-used settings, so the second run is essentially instant.
Can I use Embed File in PDF on iOS or Android?
Embed File in PDF runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 200 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.