DocSpring
PDF.co
Anvil PDF Filling API
A hosted PDF API for edge runtimes — fill AcroForm fields and merge PDFs from a single HTTP call. Deterministic output, no headless browser, callable from Vercel/Cloudflare edge functions.
Which is more popular?
Based on our record, PDFops.dev seems to be more popular. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | pdfops.dev | asocks.com |
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In their own words, as submitted to SaaSHub.
PDFops is a hosted PDF API built for edge runtimes (Cloudflare Workers, Vercel Edge, Deno, Bun). Two endpoints, one HTTP call each: Fill AcroForm fields in an existing PDF from a JSON map of field → value. Merge multiple PDFs into one. What's different from cloud PDF platforms: no headless...
ASocks is a provider of qualitative and fast proxy servers with their own infrastructure. We offer you real residential proxies at the lowest price: 3$ per 1 GB.
What each product offers, as listed by its team.
Possible disadvantages
An editorial look at what each product does well and who it suits.
Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
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How often each product is chosen within a category, 0–100% relative to the other.
As answered by people managing PDFops.dev and ASocks.
PDFops.dev's answer
PDFops started from a recurring edge-runtime pain: nearly every PDF API assumes a server with a headless browser or native libraries, which you cannot run inside a V8 isolate like Cloudflare Workers or Vercel Edge. PDFops is the deterministic write-and-merge primitive built for that environment — one HTTP call, predictable bytes out.
PDFops.dev's answer
TypeScript on the Hono web framework, with a pure-JavaScript PDF engine (a maintained pdf-lib fork) and no native dependencies. That combination runs inside V8 isolates, which is what lets PDFops execute on edge runtimes such as Cloudflare Workers and Vercel Edge.
PDFops.dev's answer
No per-call tax: $0.004 per call versus the ~$0.10 typical of incumbent hosted PDF APIs (~25× cheaper). It runs at the edge instead of round-tripping to a vendor cloud, the output is deterministic (hashable and cacheable), and there is a free, no-signup tier plus a PDF field Inspector for exploring a document’s AcroForm fields before writing any code.
PDFops.dev's answer
Deterministic, byte-identical PDF output from a single HTTP call — and it runs from edge runtimes (Cloudflare Workers, Vercel Edge, Deno, Bun) with no headless browser and no native dependencies. The same input always yields the same bytes, so you can hash, cache, diff, and sign the result.
PDFops.dev's answer
Developers and AI-application builders who need to fill AcroForm fields or merge PDFs programmatically — especially teams deploying on edge runtimes who cannot run a headless browser or native PDF binaries inside a V8 isolate.
Share your experience with using PDFops.dev and ASocks. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.
We have no reviews of PDFops.dev yet. Be the first one to post
I have worked with many services that provide proxies, but asocks stands out among them. Responsive support managers, user-friendly interface, nice prices. I am very happy!
Good service with loads of countries to choose from, very inexpensive compared to other providers, I like that you pay as you go, no need for expensive subscriptions. If you need a proxy from time to time Asocks is...
I have used other services before but that service is just amazing. Great support + amazing options on the website how to create individual proxy. I just can recommend this service to anyone.
Recommendations tracked on public social media and blogs since March 2021.
# 1. What fields does this template have? Curl -X POST https://pdfops.dev/api/inspect -F "pdf=@application.pdf" # 2. Fill it Curl -X POST https://pdfops.dev/api/fill-form \ -F "pdf=@application.pdf" \ -F... - Source: dev.to / about 2 months ago
// src/index.ts — Cloudflare Worker (module syntax) Export interface Env { TEMPLATES: R2Bucket; // bucket holding your blank AcroForm PDFs } Export default { async fetch(req: Request, env: Env): Promise { if... - Source: dev.to / 3 months ago
Tracking ASocks since Oct 2022.
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