Assinafy
Brazilian e-signature API with a free plan
Convert HTML, images, and text to PDF.
BuildPDF API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Convert HTML, images, and docs to PDF with a simple REST API. 100 free conversions/month. No sign-up friction.
Details from buildpdf.co.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Brazilian e-signature API with a free plan
Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation
HTML/URL to PDF/PNG, Office documents to PDF, image conversion
The BuildPDF API is provided by BuildPDF API (buildpdf.co). Convert HTML, images, and docs to PDF with a simple REST API. 100 free conversions/month. No sign-up friction.
Yes. The BuildPDF API is listed in the Documents & Productivity category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The BuildPDF API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The BuildPDF API supports CORS, so front-end JavaScript can call it directly.
Yes. The BuildPDF API is served over HTTPS, so it's safe to use in production.