WhatsApp is widely used for much more than sending simple text messages. People regularly share photos, videos, PDF files, documents, website links, contact information and other content through the messaging platform.
On an iPhone, users may often want to move content directly from another app into WhatsApp. For example, you might want to send a photo from the Photos app, share a webpage from Safari or forward a PDF stored in the Files app.
Apple's iOS ecosystem provides different ways for apps and services to interact with WhatsApp. Depending on what a user or app developer wants to accomplish, Universal Links, Custom URL Schemes and Share Extensions can be used for different purposes.
Understanding the difference between these options can make WhatsApp sharing easier and also help developers choose the appropriate integration method.
1. Universal Links Can Open a WhatsApp Conversation
One convenient method for directing someone to a WhatsApp conversation is through a Universal Link using WhatsApp's wa.me format.
This can be useful when a website, app or online service wants to provide a button that takes a user directly to a WhatsApp chat with a particular number.
The telephone number needs to be entered in the appropriate international format. It should include the country code but generally exclude symbols and formatting characters such as a plus sign, brackets, spaces or dashes.
For example, the number should be formatted as a continuous sequence of digits with the relevant country code.
A predefined message can also be included in the link. When configured correctly, WhatsApp opens the conversation and places the prepared text inside the message field.
The user can then review the message before deciding whether to send it.
This approach is particularly useful for businesses that provide WhatsApp contact buttons on websites or for services that want to make it easier for customers to start a conversation.
2. Custom URL Schemes Can Launch WhatsApp From an iPhone App
Developers building an iOS application may also use WhatsApp's supported URL scheme to initiate certain interactions with the app.
The commonly used WhatsApp scheme begins with whatsapp://.
This method can allow an application to attempt to open WhatsApp and initiate a supported action.
For developers, another consideration is determining whether WhatsApp is installed on the user's iPhone.
Apple provides the canOpenURL method through UIApplication for checking whether an app can handle a particular URL scheme. Developers may also need to declare the relevant scheme under LSApplicationQueriesSchemes in the application's Info.plist, subject to Apple's current development requirements.
This is primarily a developer-facing integration method rather than a setting that ordinary WhatsApp users need to manually activate.
3. Share Extensions Make Everyday File Sharing Easier
For most iPhone users, the Share Sheet is the simplest and most familiar way to send content from another app to WhatsApp.
When an application supports Apple's sharing system, users can tap the Share button and select WhatsApp from the available destinations.
This makes it possible to send various types of supported content, including photos, videos, text, PDFs, documents, audio files, contact information and web links.
Suppose you are reading an interesting webpage in Safari. Instead of copying its address, opening WhatsApp and pasting the link manually, you can use Safari's Share option and choose WhatsApp.
The same principle applies to media.
A picture or video stored in the Photos app can be selected and shared through the iPhone Share Sheet. Similarly, a PDF or another compatible document stored in Files can be shared directly with a WhatsApp contact or group.
Edit Photos and Videos Before Sharing When Necessary
Users should remember that the editing tools available during the sharing process can vary according to the type of content and the apps involved.
If a photograph needs significant editing, it may be easier to make those changes in the Photos app or another image editor before sending it.
Similarly, users who want to cut or modify a video can edit it using an appropriate video-editing tool before opening the Share Sheet.
Documents should generally be modified in the app that supports editing that particular file type.
This approach helps ensure that the final version—not an unfinished copy—is sent through WhatsApp.
Check File Size and Format Before Sending Large Attachments
WhatsApp supports sharing large files and multiple items, but users should not assume that every type of content has identical limits.
The maximum number of items, permitted file size and supported format can vary depending on the type of attachment, WhatsApp version and platform.
If a large video, document or collection of files fails to send, check the individual file sizes and formats and ensure that WhatsApp is updated to the latest available version.
Users should also consider their mobile-data allowance when sending very large files without Wi-Fi.
Which WhatsApp Integration Method Should You Use?
The right option depends on what you are trying to achieve.
A Universal Link is useful when the goal is to take someone directly to a WhatsApp conversation, potentially with a prepared message.
A Custom URL Scheme is more relevant to iOS developers who want their application to launch WhatsApp or initiate a supported WhatsApp action.
For ordinary users who simply want to move photos, videos, PDFs, web links and other content from an iPhone app into WhatsApp, the Share Sheet or Share Extension is generally the most practical option.
These methods do not mean that WhatsApp has suddenly become connected to every other messaging service. Instead, they are mechanisms that allow supported apps and content on an iPhone to interact with WhatsApp more conveniently.
Knowing the difference can help users share content faster while preventing confusion about what WhatsApp's iPhone integration features actually do.
