PDF4 handles the PDF tasks most people open Adobe Acrobat for — convert, merge, split, compress, OCR, sign and redact — right in your browser, for free. No subscription, no download, plus a REST API and MCP server when you want to automate.
Adobe Acrobat is powerful software, but for many people it is more than they need — a paid subscription and a desktop install for tasks that take seconds online. PDF4 is built for exactly those everyday jobs.
If you mainly use Acrobat to convert a PDF to Word, combine a few files, shrink a document for email, OCR a scan or sign and send a contract, PDF4 does all of that free in your browser. We are not trying to be a full Acrobat Pro clone: PDF4 does not replace advanced features like complex interactive form authoring or rewriting page text and layout visually in place. Where Acrobat is genuinely stronger, the comparison below says so. What PDF4 adds that the Acrobat desktop app does not is a developer API and an MCP server, so teams and AI agents can automate document work.
An honest look at how the free, online PDF4 toolset compares to Adobe Acrobat Pro for the tasks people use most.
| Feature / task | PDF4 | Adobe Acrobat |
|---|---|---|
| Price | FreeOptional account for higher limits | Paid subscriptionAcrobat Reader is free; Pro is paid |
| Install required | No — runs in the browser | Yes — desktop / mobile appAcrobat web exists with a plan |
| Convert PDF ↔ Word, Excel, PPT, images | Yes, free | Yes |
| Merge & split PDFs | Yes, free | Yes |
| Compress PDF | Yes, free | Yes |
| Sign PDF / fill forms | Yes, free | Yes |
| OCR scanned documents | Yes, free | Yes |
| Redact & password-protect | Yes, free | Yes |
| Reorder, rotate & delete pages | Yes, free | Yes |
| Advanced visual content editing (rewrite text & layout in place) | LimitedBest for metadata, pages, redaction | Stronger — full in-place editing |
| Complex interactive form authoring | NoCan fill & flatten existing forms | Stronger — full form designer |
| REST API for automation | Yes | Separate Adobe service / SDK |
| MCP server for AI agents | Yes | No |
Comparison is based on common, everyday tasks. Adobe and Acrobat are trademarks of Adobe Inc.; PDF4 is an independent product and is not affiliated with Adobe.
Every tool below runs in your browser with no install. Try one with your own file, no account needed.
The Acrobat desktop app is built for one person editing one document at a time. If you need to process thousands of files, wire PDF handling into your product, or let an AI agent work with documents, PDF4 gives you something Acrobat does not: a clean API.
Call every PDF4 operation over HTTPS with a Bearer token — convert, merge, OCR, extract and more. See the API docs.
Connect Claude, Cursor and other MCP clients so an agent can read and process PDFs as native tools. Details on the AI agents page.
Batch-convert invoices, redact records or extract data on a schedule — no manual clicking, no per-seat desktop licences.
Yes. PDF4 is a free, browser-based alternative to Adobe Acrobat for the PDF tasks most people actually use Acrobat for — converting, merging, splitting, compressing, OCR, signing and redacting documents. You can run these tools online with no account and no install. Acrobat Pro remains stronger for advanced needs like complex interactive form authoring and deep visual content editing; PDF4 focuses on the everyday tasks and adds an API for automation.
Yes. With PDF4 you can edit PDFs in your browser without Acrobat — reorder, rotate, delete and extract pages, add page numbers, watermarks and headers, edit metadata, redact sensitive text and sign documents. PDF4 does not do full free-text visual content editing the way Acrobat Pro can rewrite paragraphs in place, so for that specific task Acrobat is still stronger.
Yes. Files are uploaded over an encrypted HTTPS connection, processed on our servers, and automatically deleted within a few hours. We do not sell or share your documents. For sensitive files you can also redact content and password-protect the output before sharing.
Yes. PDF4 runs entirely in your web browser, so there is nothing to download or install and no subscription required to start. It works on Windows, macOS, Linux, Android and iOS — anywhere you have a browser.
PDF4 converts PDFs to and from Word, Excel, PowerPoint, JPG, PNG and more for free in the browser. For developers, the same conversions are available through the PDF API, so you can automate them in bulk instead of opening files one at a time.
Yes. PDF4 offers a REST API and a Model Context Protocol (MCP) server so apps, scripts and AI agents can convert, OCR, extract and process PDFs programmatically. This is something the Acrobat desktop app is not built for, and it lets teams automate document workflows with a few API calls.
Use the free, no-install PDF tools in your browser — or create a free account for higher limits and API access.