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Local PDF tool - browser processing

Add an image to a PDF without uploading

Adding an image to a PDF places a picture — a logo, scan, photo, or signature image — onto the page as real PDF content, processed locally in your browser. You pick the image, position and resize it, and export, while both the image and the PDF stay on your device.

Add an image locally See the proof

0 bytes sent proof

What the widget measures

The panel counts what leaves your browser after you choose a file. The site's own scripts and fonts load like any web page — what you will never see is a request carrying your PDF. Check it here, or open your browser's Network tab and see for yourself.

0 bytes of your document sentStarts measuring when you choose a file on a tool page
Document request bodies
0 bytes
App network after file open
0 bytes
Processing engine
Browser WASM worker

The number is scoped to request bodies after you choose a document. App assets such as JavaScript, WASM, and fonts can still load; those are not your PDF bytes.

Verify it yourself
  1. Open DevTools, then the Network tab.
  2. Choose a PDF in the tool and complete the action.
  3. Filter for fetch or XHR requests; document processing should not create a request carrying your file.

Stronger check: load the tool page first, then disconnect from the network before choosing the file. Already-loaded tool code can continue processing locally, but a first visit still needs the site assets.

Local vs. online

How local processing compares

Doing this in Lemmafour keeps the file on your device. A typical online PDF tool uploads it to a server first — here is the practical difference:

  Typical online PDF tool Lemmafour
Where your file goes Uploaded to the provider’s servers Stays in your browser — never uploaded
Works offline No — it needs a round trip to their server Yes, once the page has loaded
Account or sign-up Often required Never — no account, no email
What they keep afterwards Your file sits on their servers until they delete it Nothing to keep — it never left your device

Steps

How to do it in Lemmafour

  1. Choose Add an image locally.
  2. Open the PDF with Choose PDF or LOAD PDF.
  3. Choose Image in the toolbar.
  4. Pick a PNG, JPEG, WebP, or another browser-supported image from this device.
  5. Place, resize, and export the PDF.

Expert note

Image placement and file size

An inserted image becomes PDF page content, which can make the output larger than the source. For a photo-heavy file, compress after adding images if sharing size matters. For evidence or ID images, inspect the exported PDF at high zoom to confirm the image is legible and has not covered required text.

FAQ

Questions people ask before using this tool

Can I add a signature image?

Yes, but the Sign tool is better when you want reusable drawn, typed, or imported signature assets.

Are images sent for conversion?

No. Browser image decoding and PDF insertion happen locally.

Can I move the image after placing it?

Yes. Use the editor controls before exporting the final PDF.

Related private PDF workflows

Keep working locally

Sign a PDF without uploading Add a drawn, typed, or imported visual signature to a PDF locally in your browser. Convert images to PDF without uploading Create a PDF from local JPG, PNG, or WebP images in your browser. Compress a PDF locally Reduce PDF file size right in your browser — the file never goes to a server to be compressed. Edit a PDF without uploading it Open the Lemmafour PDF editor and edit a PDF in your browser without sending document bytes to a server. PDF tool hub Browse the shipped local PDF tools.