Placid alternative for images and PDFs from HTML
Placid is a template editor and API that makes images, PDFs, and videos from a saved design. 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 many images or documents from one design, and it helps you plan a move if you already use Placid. thirds.ai is not affiliated with Placid, and Placid is a trademark of its owner.
Checked on 6 September 2026 against the sources listed at the end.
The short answer
If you need video, or you want to connect image generation to Zapier, Make, n8n, Airtable, WordPress, and Webflow without code, Placid is the more complete choice today, and its unlimited free previews make testing easy. thirds.ai fits better when your design starts as HTML or as words in a chat, when you want a PDF to cost the same one credit as an image, and when you want a brand kit to keep every file on brand. Both tools have a visual editor, an API, an MCP server, and a free way to try them, so the best test is to build one of your real templates in each.
Side by side
| What you need | thirds.ai | Placid |
|---|---|---|
| Inputs | Words in an AI chat, your own HTML with template data, or a source image that becomes an editable template. | A template you design in the Placid editor or take from its library, then fill with a layers object of text, colours, and images (vendor claim). We saw no HTML input or source-image import (our reading). |
| Outputs | PDF, PNG, JPEG, and WebP. | JPG, PNG, and WebP images, multi-page PDFs, and video (vendor claim). |
| Template editing | A visual editor and an AI chat that share one working template, with immutable saved versions. | A drag-and-drop editor, a free design library, and an Editor SDK you can embed in your own app (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). |
| 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://api.placid.app/api/rest with POST /images and POST /pdfs, a webhook_success field, a polling_url, and transfer to your own S3 bucket, plus a URL API and MCP (vendor claim). |
| Integrations | The web app, the API, and MCP. | Zapier, Make, n8n, Airtable, WordPress, Webflow, Ghost, and ChatGPT (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 credit per image, two credits per PDF page, and ten credits per ten seconds of video (vendor claim, seen 6 September 2026). Basic is $19 a month for 500 credits and Pro is $39 for 2,500, with no overage. Unused credits roll over up to two months. |
| Free tier | 25 credits a month with a verified account, no card needed, and every feature included. | A free trial with no card, plus unlimited watermarked previews on every plan (vendor claim, seen 6 September 2026). We did not see a monthly free plan (our reading). |
| 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). | Marketing teams that want images and video from a drag-and-drop design, connected to the tools they already use without code (our reading). |
What thirds.ai does not do
- It does not make video.
- It does not offer Zapier, Make, n8n, Airtable, WordPress, or Webflow integrations.
- It does not offer free watermarked previews through the API. Failed renders cost nothing, and 25 free credits reset each month.
- It does not offer a hosted editor you can embed in your own app.
- It does not send files to your own S3 bucket. A signed download link lasts 15 minutes, and the file stays in your account for 30 days.
What Placid does not do
- It does not take HTML as the input on the pages we read (our reading).
- It does not offer a source-image import that rebuilds a picture as an editable template (our reading).
- It does not show brand kits on the pages we read (our reading).
- It does not offer a monthly free plan. The free trial ends, and then a plan is needed for live renders (our reading).
- It stops rendering when a plan runs out of credits, because there is no overage (vendor claim).
Pricing assumptions
- We read both pricing pages on 6 September 2026. Prices can change, so check the Placid 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 Placid credit is one image, and one PDF page costs two credits (vendor claim). A ten-page PDF costs 20 Placid credits and one thirds.ai credit.
- We compare the monthly price of each entry paid plan. Both vendors offer a yearly price with two months free.
- Placid gives a free trial and unlimited watermarked previews. thirds.ai gives 25 live credits a month and includes every feature on the free plan.
Moving from Placid
Both APIs fill a saved template with data and return a job that you poll or receive through a webhook, so the shape of the work is the same. Placid takes a template_uuid and a layers object keyed by layer name. thirds.ai takes a template_id, a version, and a data object keyed by the field names in your HTML. Placid returns a polling_url and can call webhook_success. thirds.ai returns a job with an id and a status, and a webhook sends render.succeeded when the job ends.
The design itself does not move as a file, because Placid stores layers and thirds.ai stores HTML. Rebuild each template once: paste your HTML into the editor, or use the source-image import with an exported PNG of the Placid design and let thirds.ai rebuild it as editable HTML. Then save the fields you need, copy the template ID, and switch the API call. Start with Create your first PDF, then read Use templates with your data for fields, schemas, and versions.
Sources
- https://placid.app/, checked 6 September 2026
- https://placid.app/pricing, checked 6 September 2026
- https://placid.app/docs, checked 6 September 2026
- https://placid.app/docs/2.0/rest/images, checked 6 September 2026
- https://placid.app/docs/2.0/rest/pdfs, checked 6 September 2026
- thirds.ai facts come from our pricing page, API reference, and billing guide.
Try one of your real templates on both tools before you choose. Start free with 25 credits a month, or read how HTML to image works on thirds.ai.