In an era where digital documentation is paramount, the ability to efficiently convert and edit PDF files is critical for productivity. The convenience of transferring data across platforms while maintaining quality has made PDFs indispensable. Yet, the challenges of editing PDFs and converting files on mobile devices without a laptop or desktop have been significant pain points for users.
In today's post, we will present a case study of a PDF converter app, available on two operating systems, including the App Store (iOS) and the Google Play Store (Android).
App Store Optimization(ASO) Results
Our ASO strategy led to immediate results:
- The app's visibility in store searches jumped significantly
- +200% in Overall downloads, effectively tripling previous figures
- +15.1% in conversion rate in just one month
App story
Our client's app, a robust PDF converter available on both iOS and Android, addresses these issues head-on. Since its launch in 2019, the app has garnered over 5 million users by enabling seamless conversion of images to PDFs, resizing capabilities, and more. Despite its utility, the app faced limitations in marketing due to budget constraints and sought out ASO World's expertise for cost-effective promotion solutions.
The app's name remains anonymous here to protect the privacy of our customers. To give you a better idea of the app's story we're sharing, we show one of its competitors on the Google Play Store.
App Store Optimization challenge
To increase traffic, our customer hopes to quickly improve the ranking of the most important keywords. Their main founder informed us that they were always looking for app growth marketing experts to assist them in expanding their business.
Working with the ASO World team, they demand that their demands be met within 3 months.

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App Store Optimization solution
When we did our first ASO analysis for this app, we found that it had a lot of room for improvement at the ASO level.
ASOWorld provides free ASO intelligent diagnosis function. From the diagnosis results, we found that optimization can be done in the direction of increasing effective keyword coverage and improving keyword rankings.
Keyword optimization
Keyword research is a very useful technique for researching and defining which keywords our potential customers will use to find us (traffic) and we want to be found (difficulty ranking for said keywords). It should be noted that once keywords are defined, it is important to monitor them frequently, review them and repeat keyword research if necessary.
To define this PDF converter app's keywords, we have prepared a list of all keywords related to "pdf", "pdf converter", "pdf converter free", "picture to pdf" and "picture to pdf", their combinations and suggestions as well as the most used keys for the competition Words.
From this list, we considered the most relevant keywords at the business level that have high traffic and make sense at the mobile app store search level.
Then we started the
Guarantee keywords ranking service. Here is one of our customer's PDF keywords. You can see the very strong stability of our ranking service.
Product page optimization
Once our keyword list is defined, the next step is to formulate the text of the application file. Remember, as we mentioned in the first point, these fields have different weights at the ASO level and are not the same for both operating systems.
⚡ Related Reading:
App Store vs. Google Play Store In ASO Strategies
Optimization for Apple App Store
In the app name, as the most relevant field, we deal with the most important keywords with the aim of ranking first.
With 30 characters available, we recommend using branded keywords with the three most important keywords.
In the Subtitle, we utilize
30 characters (like App Name) to put other interesting keywords at the traffic level where we didn't put App Name.
The keyword field is 100 characters long and is where we include the most keywords to optimize search ASO in the App Store. In this hidden field (i.e. not visible from the device or the app store itself) we include the most interesting keywords.
In the promotional text, we added a catchy phrase to communicate the purpose and benefits of the app so users know what they're getting from it.
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Optimization for Google Play
Titles on Google Play are currently
50 characters (before the implementation of the new guidelines, they will be 30 characters), so we used the space to research phrases that define the focus of the app, including the most relevant keywords. As in the App Store, we always recommend working on branding with the keywords we want to target, as the title is the most important field.
For the short description field, we optimized by adding two related keywords at the traffic level, targeting those keywords as well.
Unlike the App Store, the Google Play long description affects ASO because every word that contains this field is indexed by Google.
Google provided 4,000 characters, so what we did was use HTML, bold, and emoji to improve the structure of the current description. In this way, we managed to use almost every character available to prepare a description that allows Google to understand what the app is about and target it with the keywords we defined in our ASO keyword research.
Conclusion
This case study demonstrates how strategic ASO can lead to dramatic improvements in app visibility and downloads without requiring a large marketing budget. By focusing on keyword optimization and product page enhancements across both major platforms, we were able to deliver exceptional growth for our client's PDF converter app. Our success showcases why ASO World is a trusted partner for developers and marketers seeking effective App Store Optimization services.