Local PDF tool - browser processing

Convert images to PDF without uploading

Converting images to PDF without uploading means building a PDF from local JPG, PNG, or WebP images in your browser. You select the pictures, set page size, fit, and margins, and create the PDF — your images are read and assembled on your device, never uploaded.

Create PDF 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

Open DevTools, then the Network tab.
Choose a PDF in the tool and complete the action.
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

Choose Create PDF locally.
Select one or more images from this device.
Reorder or rotate images if needed.
Set page size, fit, margin, orientation, and output mode.
Create the PDF and download it.

Expert note

Image format handling

JPG and PNG are the most predictable inputs. Browser support determines which newer image formats can be decoded. If an image contains fine text or IDs, prefer best-quality output first, then compress the final PDF only if file size is still too large.

FAQ

Questions people ask before using this tool

Can I use phone photos?

Yes, as long as the browser can read the image format.

Can I make a smaller PDF?

Yes. Use the smaller output mode, then inspect the result for readability.

Are images uploaded for conversion?

No. The conversion happens in the browser.

Related private PDF workflows