About OmniPDF

OmniPDF is a free, all-in-one PDF toolkit built on a simple premise: your documents should never leave your device.

What we build

A complete set of PDF tools for merging, splitting, compressing, converting, editing, protecting and signing documents. Every tool runs in your browser using JavaScript, WebAssembly and standard web APIs. No server receives a copy of your file.

Most online PDF services work by uploading your file to a server, processing it there, then downloading the result. This is simple for the operator but means your document sits in a processing queue, in a temporary directory, in a storage bucket, on a machine you have no visibility into. For business documents, contracts, medical records, financial statements and identification scans, that is a serious privacy cost that most people accept without thinking about it.

OmniPDF chooses a different architecture. All processing is done in your browser, on your device, with libraries that are downloaded once and cached. There is no processing queue because there is no processing server. There is no storage bucket because there is nothing to store.

Why we build it this way

Three reasons:

1. Privacy is a real problem, not a marketing angle. A single leaked document can cost a company millions in fines. A single leaked medical record can affect a person for years. Every file uploaded to a server is a risk that didn't need to exist.
2. Browser APIs are now powerful enough. pdf-lib, pdf.js, Tesseract.js and similar libraries are mature, fast and secure. Ten years ago, running OCR in a browser was impossible. Today it is a JavaScript import. The architecture is finally viable.
3. Server costs make free services unsustainable. Every server-based PDF service either pays for its own compute (and eventually introduces paywalls) or monetises aggressively (with aggressive ads, mandatory watermarks, data sales or file retention). OmniPDF has no server to pay for, so it can stay genuinely free.

How the site is built

• Static HTML, CSS and vanilla JavaScript. No React, no Vue, no framework. Just the fundamentals.
• Client-side processing. pdf-lib for creation and modification, pdf.js for rendering, Tesseract.js for OCR, SheetJS and Mammoth for Office formats.
• Cloudflare Pages for hosting. Fast global CDN, no server to maintain.
• Self-hosted libraries. No runtime CDN dependency. Every third-party library is vendored and version-pinned.
• Progressive Web App. Installs as an app, works offline once loaded, caches the tools you use most.

What we do not do

• We do not upload your files to any server.
• We do not sell your data. We have none to sell.
• We do not require an account. You can use every tool without signing in.
• We do not add watermarks to your output files.
• We do not claim features work when they do not. Every tool page discloses its limitations.
• We do not invent testimonials, ratings, user counts or search rankings.

How the site stays free

Display advertising. Ads on the tool pages pay the small hosting bill for the site. No ads inside the tool workspace, no ads over upload controls, no pop-under windows, no fake download buttons. The PDF tools themselves have no ads inside the actual workspace.

If you find OmniPDF useful, the best way to support it is to disable your ad blocker for this domain. If you cannot, that is fine too — the tools work either way.

Team

OmniPDF is built and maintained by a small team of software engineers focused on privacy-respecting tools. We do not publish individual bios because the products are what matters, not the personalities. All editorial content is written by the OmniPDF Product Team and fact-checked before publishing.

Contact

Questions, bug reports, feature suggestions, or partnership enquiries: see the contact page.