DocSpring API alternatives

Fill PDF forms, generate PDFs and Word documents, and collect e-signatures. Free plan. If it doesn't fit your project, here are the 10 best free Documents & Productivity APIs to use instead in 2026, out of 62 in the directory.

For reference, DocSpring API: 100% uptime (30 days) · Callable from the browser (CORS) · HTTPS.

1. 1D

   DocStruct API

   Online · 874 ms

   AI extraction of invoices, receipts, bank statements & contracts into structured JSON/CSV.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
2. 2A

   AgentPay Doc Tools API

   Online · 922 ms

   PDF to text, RSS/Atom/JSON feeds to JSON and sitemaps to URL lists, paid per call via x402.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
3. 3

   BuildPDF API

   Online · 852 ms

   Convert HTML, images, and text to PDF.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
4. 4

   CleverUtils API

   Online · 1630 ms

   Convert files between 200+ formats, free with no API key.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
5. 5

   Cloudmersive Document and Data Conversion API

   Online · 975 ms

   HTML/URL to PDF/PNG, Office documents to PDF, image conversion.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
6. 6

   Renderly API

   Online · 1060 ms

   HTML to PDF conversion API built on Chromium.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
7. 7

   TeamSort API

   Online · 1295 ms

   Create a ranked-choice poll from a text prompt and get a shareable link.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
8. 8

   AI Form API

   Online · 2552 ms

   Create forms, share a link and read responses as JSON or CSV.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
9. 9

   Asana API

   Online · 3011 ms

   Programmatic access to all data in your asana system.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
10. 10

    ConvertFly API

    Online · 1235 ms

    Convert documents, images, audio, video, ebooks and archives between formats.

    • 100% uptime (30 days)
    • Callable from the browser (CORS)
    • HTTPS

    apiKeyHTTPSCORS

DocSpring API vs alternatives

DocSpring API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
DocSpring	Required	Yes	Yes	100%	1212 ms	Not rated
DDocStruct	No	Yes	Yes	100%	874 ms	Not rated
AAgentPay Doc Tools	No	Yes	Yes	100%	922 ms	Not rated
BuildPDF	Required	Yes	Yes	100%	852 ms	Not rated
CleverUtils	No	Yes	Yes	100%	1630 ms	Not rated
Cloudmersive Document and Data Conversion	Required	Yes	Yes	100%	975 ms	Not rated
Renderly	Required	Yes	Yes	100%	1060 ms	Not rated
TeamSort	No	Yes	Yes	100%	1295 ms	Not rated
AI Form	Required	Yes	Yes	Up	2552 ms	Not rated

See also: best Documents & Productivity APIs · all Documents & Productivity APIs