Fillable vs PDFWix

Fillable is a web and API service for turning PDFs into guided client workflows. It detects fields, accepts document uploads, supports signatures, and creates shareable completion links that clients can use without an account or app. Browser tools can fill, create, sign, merge, split, compress, convert, and OCR PDFs. Guided packs collect completed forms and requested documents; the free plan includes one active pack, all library templates and official forms, and a test API key. Teams can import existing PDFs, apply field validation and conditional logic, and export PDF or JSON. The REST API parses PDF fields and text into JSON and fills existing form fields. Each key allows 100 requests per calendar day, counting authenticated calls that succeed or return errors. It does not create PDFs from HTML, convert file formats, or add fields to flat PDFs. Core tools run in the browser; server-side conversions upload files and delete them afterward. Paid monthly plans start at $9/mo.

PDFWix is a free service for PDF and image work, with web, Android, and iOS platforms. Its PDF tools merge, split, compress, convert, edit, sign, secure, and repair files, and also organize pages, fill forms, add watermarks and signatures, redact content, edit metadata, and perform OCR. Image tools handle compression, resizing, cropping, watermarking, and format conversion. The Free web app costs nothing and includes 35+ PDF tools, no daily task limits, no watermarks, and no signup requirement. Most tools run in the browser through WebAssembly. Protect PDF and Unlock PDF process files on servers; PDFWix says those files use TLS 1.3, stay in memory, and are not written to disk. Browser tools have a device-memory limit, while Protect and Unlock accept files up to about 25 MB per request, with another FAQ giving different figures. PDFWix is not HIPAA certified. It lists a remote MCP server using OAuth 2.1 and a pre-launch REST API with a waitlist.