HTML/CSS to Image alternative for branded images and PDFs
HTML/CSS to Image is an API that turns HTML and CSS, or a web page URL, into an image, with templates and a visual designer on top. thirds.ai turns words, your own HTML, or a source image into an editable branded template, then renders that template as a PDF or a static image through the web app, the API, or MCP. This page helps you choose between the two when you need images from HTML, and it helps you plan a move if you already use HTML/CSS to Image. thirds.ai is not affiliated with HTML/CSS to Image, and HTML/CSS to Image is a trademark of its owner.
Checked on 6 September 2026 against the sources listed at the end.
The short answer
If you want a small, fast API that returns a permanent image URL from a CDN, or you need screenshots of public web pages, HTML/CSS to Image is a good fit, and its free tier gives you 50 images a month. thirds.ai fits better when you want a PDF and an image from the same template at the same one-credit price, when your team wants to build or change the template in a visual editor or an AI chat, and when you want a brand kit to keep every file on brand. Both tools take raw HTML, have a template designer, and give you an MCP server, so render one of your real designs on each before you decide.
Side by side
| What you need | thirds.ai | HTML/CSS to Image |
|---|---|---|
| Inputs | Words in an AI chat, your own HTML with template data, or a source image that becomes an editable template. The API takes HTML text, not a page URL. | HTML in html with separate css, a public page in url, or a saved template with variables (vendor claim). We saw no AI generator or source-image import (our reading). |
| Outputs | PDF, PNG, JPEG, and WebP. | PNG, JPG, and WebP by changing the file extension, and PDF on paid plans (vendor claim). |
| Template editing | A visual editor and an AI chat that share one working template, with immutable saved versions. | A visual template designer with variables, limited to 5 templates on the free plan (vendor claim). |
| Brand kits | Saved logos, colours, and fonts that the editor and the AI apply to each template. | Not shown on the pages we read (our reading). Google Fonts load through a google_fonts field (vendor claim). |
| API and MCP | A REST API at /v1/pdf, /v1/image, and /v1/templates, plus an MCP server for AI agents. | A REST API at https://hcti.io/v1/image with basic auth, viewport_width, viewport_height, device_scale, selector, and render_when_ready fields, plus batch create, S3 delivery, and MCP (vendor claim). |
| File delivery | A signed download link that lasts 15 minutes, and the file stays in your account for 30 days. | A permanent image URL on a CDN with unlimited retention on paid plans (vendor claim). |
| Integrations | The web app, the API, and MCP. | Zapier and Make (vendor claim). |
| Pricing model | One credit per successful PDF or image. Starter is $29 a month for 5,000 credits. Extra credits cost $0.008 each on a paid plan, and packs start at $10 for 1,500 credits. | One image per render. Basic is $14 a month for 1,000 images, $29 for 3,000, and $69 for 10,000, with an optional overage of $10 per 1,000 images (vendor claim, seen 6 September 2026). |
| Free tier | 25 credits a month with a verified account, no card needed, and every feature included. | 50 images a month, no card needed, with 5 templates, no PDF, and no overage (vendor claim, seen 6 September 2026). |
| Where it fits | Teams that want one editable branded template for both documents and images, with a web app and an API on the same account (our reading). | Developers who want a small image API with a permanent CDN URL, including screenshots of public pages (our reading). |
What thirds.ai does not do
- It does not load a page URL as the input. Your app sends the HTML text.
- It does not return a permanent public image URL. You download the file within 15 minutes and store it yourself.
- It does not offer a device scale setting or a CSS selector crop. You set the width and height of the image.
- It does not offer Zapier or Make integrations.
- It does not send files to your own S3 bucket.
What HTML/CSS to Image does not do
- It does not offer an AI chat or a source-image import on the pages we read (our reading).
- It does not show brand kits on the pages we read (our reading).
- It does not make PDFs on the free plan (vendor claim).
- It limits the free plan to 5 templates (vendor claim).
- It does not roll unused images into the next month on the pages we read (our reading).
Pricing assumptions
- We read both pricing pages on 6 September 2026. Prices can change, so check the HTML/CSS to Image pricing page and our pricing page before you decide.
- One thirds.ai credit is one successful PDF of up to 100 pages or one successful image. Failed renders cost nothing. See credits and billing.
- One HTML/CSS to Image render is one image (vendor claim). We did not test how it counts a PDF.
- We compare the monthly price of each entry paid plan. HTML/CSS to Image shows monthly prices and no yearly switch. thirds.ai offers a yearly price with two months free.
- HTML/CSS to Image gives 50 free images a month with limits on templates and PDFs. thirds.ai gives 25 free credits a month and includes every feature.
Moving from HTML/CSS to Image
Both APIs take HTML text and a small options object, so most of the move is a field rename. HTML/CSS to Image takes html and css as separate fields with viewport_width and viewport_height. thirds.ai takes one html string, so put the CSS in a <style> tag, and puts the size in an image object as image.width and image.height, with image.format for png, jpeg, or webp. HTML/CSS to Image returns a permanent url in the response. thirds.ai creates a render job and gives you a signed download link when the job succeeds, so add a step that downloads the file and stores it where your app serves images.
If you use google_fonts today, load the same fonts with a <link> tag or an @font-face rule in the HTML, or upload them to a brand kit and let the template read them. If you load a URL today, fetch that HTML in your app first and send the text. Start with Create your first PDF, then set sizes and formats with the PDF and image options guide.
Sources
- https://htmlcsstoimage.com/, checked 6 September 2026
- https://htmlcsstoimage.com/pricing, checked 6 September 2026
- https://docs.htmlcsstoimage.com/, checked 6 September 2026
- https://docs.htmlcsstoimage.com/getting-started/using-the-api/, checked 6 September 2026
- thirds.ai facts come from our pricing page, API reference, and billing guide.
Try your own HTML on both tools before you choose. Start free with 25 credits a month, or read how HTML to image works on thirds.ai.