How to Insert an Image or Logo in a PDF, Step by Step

Guide · 6 min read · updated 2026-10-16 · Leer en español

A logo in the corner of a quote, a signature on a contract, a product photo on a spec sheet or the company stamp on a certificate: these are common tasks that many people solve the roundabout way, opening heavy programs or pasting everything into Word and exporting again. There is no need. With Rayo PDF GO you insert an image directly on the page, place it wherever you want, change its size and save the PDF without losing quality. Here is how to do it right, with tricks to make it look professional.

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What inserting an image in a PDF is for

The most common uses are surprisingly varied. A freelancer puts their logo in the header of an invoice or proposal generated by another system. A teacher pastes the school crest into a study guide. A small business adds the product photo to a quote, and an individual inserts their signature in a contract or their photo in a resume.

It is also useful for stamps and visible marks: an “APPROVED,” a verification QR code, a received stamp or a screenshot that serves as evidence. Placing that image on top of the existing PDF is much quicker than rebuilding the document from the source file, especially when you no longer have it or it was sent to you locked.

The key is to do it with care. An image that is poorly sized, blurry or has a white box around it immediately gives away that it was added in a rush. With a few adjustments you can make it look like part of the original design, and that conveys professionalism to clients, bosses and organizations.

Step by step in Rayo PDF GO

1) Go to rayopdfgo.com/app with your free account, or open the app on your iPhone, iPad, Android, Mac or Windows. Choose Edit PDF and select the document. Have the image file ready in your gallery or in a folder.

2) Go to the page where the image will go and use the add image option. Select the file; it will appear on the page with handles in the corners. Drag it to the position you want, for example the top left corner for a logo or over the line for a signature.

3) Resize using the corners, not the sides, to keep the proportions. If you stretch from only one side, the logo looks squashed and it shows. Zoom in to fine-tune the position until it lines up with the text margins.

4) If you need the same image on several pages, repeat the process or copy and paste the element. When you finish, review each sheet and save the result under a new name to keep the original.

Which image format to choose: PNG, JPG or WebP

The format matters more than it seems. For logos, signatures, stamps and icons, a PNG with a transparent background is ideal: it blends with the paper without leaving a white box around it and keeps clean edges. If your logo only exists as a JPG with a white background, it will work fine on a white document, but it will look like a patch on one with a background color.

For photographs, a good-quality JPG is enough and weighs less than a PNG. If you only have the file in WebP or another less common format, check that it loads correctly; if it does not, convert it first. Rayo PDF GO includes image tools, such as Resize image and Crop image, that are useful for preparing the file before inserting it.

As for resolution, you do not need huge images. For a logo 1.5 inches wide in the PDF, about 600 pixels across gives a sharp result even when printed. A 12-megapixel photo inserted whole will make the document grow without improving the visible image; shrink it first and you will avoid a heavy file.

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How to get a clean signature on the document

The signature is where image quality shows the most. Sign with a black or dark blue pen on plain white paper, photograph the sheet in even light from above with no shadows, and crop the edges well with the Crop image tool. With a background as white as possible, the signature will look clean when you insert it.

If you manage to get the signature with a transparent background, even better: you will be able to place it over the line and the printed text without covering anything. Adjust its size so it is proportional to the name written below it; a giant signature looks suspicious and a very small one gets lost.

Be clear about the scope: a signature image is a visual representation. Rayo PDF GO does not guarantee its legal validity, and some procedures require an advanced electronic signature, a digital certificate or notarization. Check the organization's requirements before sending. For internal agreements, letters and simple forms, an inserted signature is usually accepted.

Common mistakes when inserting images and how to avoid them

The first mistake is distorting the image when resizing. Always use the corners to scale proportionally and check that circles are still circles. The second is using a low-resolution image taken from a web page: enlarged, it looks pixelated and lowers the credibility of the whole document.

The third is forgetting about file size. Inserting several phone photos without shrinking them can turn a 200 KB PDF into a 20 MB one that will not fit in an email or many portals. Prepare the photos with Resize image or run the final PDF through Compress PDF. Always check that the text is still legible after compression.

The fourth mistake is covering essential content: a large logo over the title or a signature over a figure can change the meaning of the document. And the fifth is using copyrighted images without permission. Use only your own logos, licensed material or your own photos; it is an unnecessary risk in a document that gets shared.

Real cases: from the quote to the certificate

A graphic designer who receives an invoice generated by a client's accounting system can add her logo and a “paid” stamp to file it with her visual identity. A shopkeeper who builds quotes from a PDF template inserts the product photo next to the price without fighting with a design program.

A student inserts her photo on a scholarship data sheet and her signature at the end, all in one file before uploading it to the portal. A building manager pastes the complex's stamp onto a notice. A photographer adds his mark in the corner of a PDF portfolio before sending it to a client.

In every case the process is the same: prepare the image well, place it in proportion, review and save under a different name. If you need the image on every page with a watermark look, the Watermark tool does it for the whole document at once; depending on your plan, it may be part of Premium.

Protecting privacy and the final result

When you insert a signature, a stamp or a personal photo, you are handling sensitive data. In Rayo PDF GO the processing happens on your device and images are not uploaded to any server, which reduces the risk of your signature ending up stored on someone else's services. Even so, keep your signature images in a private place and do not share them on their own.

If the document is going to circulate, consider flattening it at the end so the image stays fixed on the page and cannot be easily moved or extracted. Keep in mind that no measure completely prevents someone from copying what is visible, so do not insert high-resolution signatures in public documents.

And as a final check, open the PDF on another device, preferably your phone, and verify that the logo looks sharp, the signature is in place and the file opens quickly. If everything looks right, you can send it with confidence.

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Frequently asked questions

How do I insert a logo into a PDF?

Open the PDF in Edit PDF, choose the add image option, select the logo file, drag it to the position you want and adjust the size from the corners so you do not distort it.

What format is best for a logo or a signature?

A PNG with a transparent background, because it blends with the document without leaving a white box. JPG works for photos, but its white background can look bad on colored pages.

Why is my PDF so large after inserting an image?

The image probably has a very high resolution. Shrink it before inserting it, or compress the PDF at the end and check that the text is still sharp.

Can I insert the same image on several pages?

Yes. You can repeat the process page by page or copy the element. For a mark repeated across the whole document, the Watermark tool is faster.

Is a signature inserted as an image legally valid?

It is a visual representation, and Rayo PDF GO does not guarantee legal validity. If your procedure requires a certified electronic signature or a notarized one, confirm with the organization first.