MostlyPDF

MostlyPDF provides a free online suite of PDF tools and a flat‑priced API that consolidates 38 PDF operations—merge, split, compress, OCR, conversion and more—into a single endpoint. Users can process files via base64 payloads with a bearer token, enabling automation of everyday document workflows without per‑operation credit weighting. The service is offered by Mostly Tiny Ltd and includes a free plan with no sign‑up, watermark, or daily limits.

MostlyPDF is listed with 1 API on the APIs.io network. Tagged areas include Company, PDF, Automation, and Free Tools.

MostlyPDF’s developer surface includes authentication, engineering blog, documentation, API reference, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.8/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

1 API

Company PDF Automation Free Tools

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 19.8/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 6.1 / 17

Access Clarity 3.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.9 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/mostlypdf/"><img src="https://apis.io/badge/mostlypdf/card.svg" alt="MostlyPDF on APIs.io — Kin Score by API Evangelist"></a>

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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/mostlypdf: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
PDF and Document Standards (PDF tooling, document signing trust, invoice documents)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

PDF

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

MostlyPDF API

Run any MostlyPDF tool programmatically via a single POST endpoint.

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Mostlypdf Authentication

2 schemes

SECURITY

Mostlypdf Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Access & Security 4

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

Authentication

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

SignIn

SignIn

Source (apis.yml)

aid: mostlypdf
name: MostlyPDF
image: https://mostlypdf.com/og.png
description: MostlyPDF provides a free online suite of PDF tools and a flat‑priced API that consolidates 38 PDF operations—merge,
  split, compress, OCR, conversion and more—into a single endpoint. Users can process files via base64 payloads with a bearer
  token, enabling automation of everyday document workflows without per‑operation credit weighting. The service is offered
  by Mostly Tiny Ltd and includes a free plan with no sign‑up, watermark, or daily limits.
url: https://raw.githubusercontent.com/api-evangelist/mostlypdf/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-02 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-02'
modified: '2026-10-02'
tags:
- Company
- PDF
- Automation
- Free Tools
tags_raw:
- Company
- PDF
- API
- Automation
- FreeTools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: SecurityTxt
  url: well-known/mostlypdf-security.txt
- type: SecurityTxt
  url: well-known/mostlypdf-mostly-pdf-security.txt
- type: WellKnown
  url: well-known/mostlypdf-well-known.yml
- type: Authentication
  url: authentication/mostlypdf-authentication.yml
- type: LLMsTxt
  url: llms/mostlypdf-llms.txt
- type: Hosts
  url: hosts/mostlypdf-hosts.yml
- type: Vendors
  url: vendors/mostlypdf-vendors.yml
- type: Blog
  url: https://mostlypdf.com/blog
- type: DomainSecurity
  url: security/mostlypdf-domain-security.yml
- type: Website
  url: https://mostlypdf.com
- type: Documentation
  url: https://mostlypdf.com/docs
- type: APIReference
  url: https://mostlypdf.com/docs
- type: Support
  url: https://mostlypdf.com/support
- type: TermsOfService
  url: https://mostlypdf.com/terms
- type: PrivacyPolicy
  url: https://mostlypdf.com/legal/privacy
- type: SignIn
  url: https://mostlypdf.com/signin
apis:
- name: MostlyPDF API
  description: Run any MostlyPDF tool programmatically via a single POST endpoint.
  humanURL: https://mostly-pdf.web.app/docs
  baseURL: https://mostly-pdf.web.app
  aid: mostlypdf:mostlypdf-api
x-submission-notes: Single-endpoint REST API for 38 PDF operations (merge, split, compress, OCR, conversion). Second notice
  (2905, 2026-09-30) corrects contact from hi@mostlypdf.com to hello@mostlytiny.io.
x-submission-probe: root 200; docs 200; OpenAPI 3.1.0 1 path (POST /v1/process, server mostly-pdf.web.app); llms.txt 200;
  404 probe 404
x-submitted-by: hello@mostlytiny.io (apis.io/add, 2026-09-29)
x-enrichment:
  date: '2026-10-02'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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