ACE HTML Block
Registers a raw html block which uses the ACE Editor. Features include syntax highligting, line numbers, indentation, and HTML validation.
Consider an alternative
ACE HTML Block shows warning signs in 2026 — compare the alternatives below before installing. It runs on 40+ sites, is rated 5/5 and was last updated 8 years ago, and scores 31/100 on our health check.
- Small user base (40+ active installs)
- Very few reviews so far
- No update in 7 years
- Only tested up to WordPress 5.1 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & supportDaily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where ACE HTML Block stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| ace-editor | #47 |
| block | >100 |
| html block | >100 |
| raw html | >100 |
| syntax highlighting | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 5 from 2 reviews
About ACE HTML Block
From the official readme · v1.0.1Description
Registers a raw html block which uses the ACE Editor. Features include syntax highligting, line numbers, indentation, and HTML validation.
Any HTML markup included in your block will be interpreted and rendered on your user-facing page or post just like the core “Custom HTML” block. This plugin is not for embedding pretty markup on your front-end site, rather it is for those developers that need to include raw HTML in their pages or posts and want to improve the readability of their HTML snippets and have a better in-browser code editing experience.
To Use:
Create a new block in the editor and look for “ACE HTML Block” in the Formatting section. It has a heart icon.
Note on block transforms:
There (hopefully) may come a time in the future when WordPress introduces native syntax highlighting on core “Custom HTML” blocks. This block is configured to transform to (and from) the core HTML block so the transition away from this plugin will be easy if you ever want to disable it. To transform this block click on the heart icon in the upper left corner of the block and select “Custom HTML” from the dropdown menu.
Thanks:
Under the hood it uses react-ace.
Screenshots
For developers
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Best ACE HTML Block alternatives
All ace-editor plugins →| Rank | Plugin | Active installs |
|---|---|---|
| 1 |
HTML Post Editor
Adds HTML tab to the post editor which shows the raw source of the page and is highlighted…
|
100+ |
| 3 |
Acelerator
Add ace editor to any textarea in admin.
|
<10 |
FAQ
ACE HTML Block: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 5, 2026
Is ACE HTML Block free?
Yes. ACE HTML Block is free to download and use from the official WordPress.org plugin directory.
Is ACE HTML Block safe to use in 2026?
ACE HTML Block shows warning signs in 2026 — compare the alternatives below before installing. It runs on 40+ sites, is rated 5/5 and was last updated 8 years ago, and scores 31/100 on our health check.
How many websites use ACE HTML Block?
ACE HTML Block is active on 40+ WordPress websites and has been downloaded 3,544 times since it launched in February 2019. It was downloaded 104 times in the last 30 days.
Does ACE HTML Block work with WordPress 7.1?
ACE HTML Block is officially tested up to WordPress 5.1.26, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
What PHP version does ACE HTML Block need?
ACE HTML Block requires PHP 5.2.4 or higher. Most hosts run PHP 8.x today, so it works on any modern WordPress hosting.
When was ACE HTML Block last updated?
The latest version, 1.0.1, was released on February 6, 2019 (8 years ago).
Who makes ACE HTML Block?
ACE HTML Block is developed and maintained by willdelphia.
What are the best alternatives to ACE HTML Block?
The most popular alternatives to ACE HTML Block are HTML Post Editor (100+ installs) and Acelerator (<10 installs).
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