KeptPDF's answer

KeptPDF runs entirely in your browser. Your file, and the text inside it, never leaves your device. Not to an AI, not even to us. You can open your browser's network tab and watch: the document bytes never go out.

Most online PDF tools upload your file to a server first, and some "AI redaction" services quietly send your document text to a third-party model. That is the exact risk people are trying to avoid when they redact something.

KeptPDF also does true redaction. The text is removed from the file, not covered with a black box you can copy out later. Every redaction produces a verification certificate you can share with the file.

RasterMint's answer:

RasterMint is unique because it converts PDFs to PNGs entirely in the browser. Files are never uploaded to a server, which makes the product faster, more private, and easier to trust for sensitive documents.

KeptPDF's answer

Three reasons.

Privacy you can verify, not just a promise. Processing happens locally in the browser, so there is no upload step to trust. We do send anonymous usage counts for quota, and we say so plainly, but never your document.

Real redaction with proof. Removed text is permanently gone, and you get a certificate showing the file was checked for leftover extractable text. Automated detection cannot catch everything, so a final human review is still your job, and the tool says that too.

It works on a phone. Most PDF suites assume a desktop. KeptPDF was built and used on a phone first, so redacting a document while you are standing in a hallway actually works.

RasterMint's answer:

A person should choose RasterMint if they want a simple and privacy-first PDF to PNG converter. Unlike many alternatives, RasterMint processes files locally on the device, supports multi-page PDFs, offers page preview and ZIP download, and requires no sign-up.

KeptPDF's answer

Anyone who has to hand a document to someone else and needs the sensitive parts gone first.

In practice that is solo attorneys and small law firms, accountants and tax preparers, healthcare and records staff handling requests, HR teams, and individuals dealing with their own medical, legal, or financial paperwork.

The common thread is not an industry. It is a person who cannot upload a confidential file to a random website, and who does not have an enterprise IT budget to solve it.

RasterMint's answer:

RasterMint is built for people who need to turn PDFs into high-quality PNG images quickly and privately. Its primary audience includes designers, marketers, students, educators, operations teams, and professionals working with presentations, reports, forms, or visual assets.

KeptPDF's answer

A family member got seriously ill. We spent most days at the hospital, and straight answers were hard to come by, so we leaned on AI tools to make sense of the records, notes, and lab results.

But you cannot paste a medical record into an AI chat. You have to strip the names, the ID numbers, the diagnoses first. And almost every tool we found either wanted to upload the whole file to a server, or "auto-redacted" by sending the document text to an online AI. That was the exact thing we were trying to avoid.

Most of this was happening on a phone, at a bedside. So I built the tool I needed: redaction that runs on the device, works on mobile, and never sends the file anywhere. That turned into KeptPDF, which is now a full PDF suite with over 20 tools, all local-first.

RasterMint's answer:

RasterMint was created to solve a common problem: most PDF to image tools require file uploads, which is slow and not ideal for private documents. RasterMint takes a different approach by running the conversion directly in the browser, giving users a faster and more privacy-friendly way to export PDF pages as PNGs.

KeptPDF's answer

The app is plain JavaScript with no front-end framework, which keeps it fast and keeps the code auditable.

PDF work happens in the browser using pdf.js for rendering and pdf-lib for writing. Text recognition uses Tesseract running as WebAssembly. Password and encryption handling uses a WebAssembly build of qpdf. It is a Progressive Web App, so it installs and works offline.

The thin server side is Node on Vercel, with Postgres for accounts, Stripe for billing, and Resend for email. None of those ever see a document.

RasterMint's answer:

RasterMint is built with Next.js, React, TypeScript, Tailwind CSS, and PDF.js. PDF rendering happens in the browser, and PNG export is handled locally through the Canvas API.

KeptPDF's answer

KeptPDF is early and independent, and we do not publish customer names. The product is privacy-first by design: we never see your documents, and we do not track who our users are or what they work on. Publishing a client list would sit badly next to that.

The user base today is mostly solo attorneys, small firms, accountants, and individuals handling their own records.

RasterMint's answer:

• RasterMint is a self-serve public web tool, so individual customer names are not published yet.
• It is used by people who need private PDF to PNG conversion for documents, reports, presentations, forms, and visual assets.