Guides
Developer guides
Practical, no-hype writing on publishing, monetizing, and building HTML5 games — for developers, not players.
How to Add Free HTML5 Games to Your Website (Iframe Embed Guide)
A straight walkthrough of embedding a game from PlayKovo's publisher catalog on your own site — the iframe code, what it needs, and what actually breaks when it doesn't work.
iframe Embed vs. JSON Feed: Two Ways to Add a Game Catalog to Your Site
Pasting a handful of iframe codes and pulling a JSON feed solve different problems. Here's when each one actually makes sense for a website adding games.
What to Check Before You Embed Someone Else's HTML5 Games
Not every embeddable game catalog is safe to drop into your site unread. Here's what actually matters — licensing, ad behavior, and load performance — before you paste a code.
Do Embedded Games Actually Help Session Time and Ad Revenue on a Website?
Adding a playable game to a page is an easy engagement lever, but it doesn't help every site the same way. Here's when it actually moves the numbers and when it's just clutter.
Common Mistakes When Embedding HTML5 Games on Your Site
The recurring, avoidable ways a game embed goes wrong on a website — most of them have nothing to do with the game itself and everything to do with how it's dropped in.
Versioning an HTML5 Game Without Breaking Player Saves
A safe update strategy for localStorage, IndexedDB, cached builds, and save-data migrations when players may return months after their last session.
Which Ad Networks Should You Actually Use for an HTML5 Game?
A rundown of the ad networks and mediation platforms HTML5 developers actually integrate — what each one is good for, how they get paid, and where a portal-supplied SDK fits into the decision.
Ad Mediation for HTML5 Games: Is Running Multiple Networks Worth It?
Stacking ad networks can lift your fill rate and eCPM, but it also multiplies your integration surface and support burden. Here's when mediation actually pays for the extra complexity.
The Retention Metrics That Actually Predict Whether Your HTML5 Game Works
Play count feels like the headline number, but it's the worst one for judging whether a game is actually good. Here's what D1/D7 retention, session length, and bounce rate tell you that raw plays can't.
Designing an HTML5 Game That Doesn't Break on Half Your Players' Screens
Your game will run on ultrawide monitors, folded phones, and everything in between, often within the same day of launch. Here's how to actually design for that instead of patching it after the bug reports arrive.
Thumbnails and Titles That Actually Get Clicked
Getting into a portal's catalog is half the battle — the other half is a thumbnail and title good enough to beat everything else on the same page. Here's what actually moves click-through rate.
GDPR, COPPA, and Ad Consent Basics for HTML5 Game Developers
Ad-supported browser games collect more player data than most developers realize, and most portals push compliance responsibility down to the game itself. Here's what actually applies, in plain terms.
Building for Mobile Web: Touch Controls That Don't Feel Bolted On
Most HTML5 portal traffic is mobile, and most mobile ports feel like an afterthought — tiny buttons, controls designed for a mouse first. Here's how to actually design for touch from the start.
Localizing Your HTML5 Game for Turkish Players: A Practical Guide
Most HTML5 catalogs ship English-only by default, which means a real Turkish localization is one of the cheapest discoverability edges left. Here's what to translate, in what order, and the technical traps specific to Turkish text.
Marketing Your Browser Game Without a Budget
Getting accepted on a portal is distribution, not marketing — it puts your game in a catalog, it doesn't make anyone click it. Here's how to actually get eyes on a game with zero ad spend.
Making Your HTML5 Game Accessible Without a Big Budget
Accessibility isn't a separate feature you bolt on later — it's a handful of cheap decisions that widen who can actually play your game. Here's where to start.
Playtesting Your HTML5 Game Before Submission: A Practical Checklist
A portal review checks policy and technical compliance, not whether your game is actually fun or clear. Here's how to catch the UX problems a reviewer never will.
Why HTML5 Game Submissions Get Rejected (And How to Avoid It)
The recurring reasons a browser game fails review across most portals — rights, ad conflicts, broken loading — and how to catch them before you submit.
Hosted Build vs. External URL: Which Should You Submit?
Two different ways to get an HTML5 game onto a portal — uploading a ZIP for them to host, or pointing at a URL you control. The tradeoffs aren't obvious until something breaks.
Optimizing HTML5 Game Load Time for Portal Submissions
A slow first load loses players (and reviewers) before they ever see your game. The concrete things that actually move load time, in rough order of impact.
Rewarded vs. Interstitial Ads: Where to Actually Place Them
The two most common HTML5 ad formats behave very differently depending on where in the game they show up. Placement matters more than which format you pick.
Where to Publish Your HTML5 Games: A Realistic List of Platforms
Every portal that will actually take an HTML5 submission in 2026, what each one is good for, and an honest read on where PlayKovo fits in that list.
HTML5 Game Traffic, Volume, and Revenue: What Actually Drives Earnings
Pageviews aren't revenue. Here's what actually moves the number on a browser game's ad earnings — and why most single games don't make much on their own.
HTML5 Game Engines: Which One Should You Actually Use?
Construct, GDevelop, Godot, Phaser, or Unity WebGL — a straight comparison focused on the thing that matters most for browser portals: how fast your build actually loads.