Almost every "free PDF tool" on the open web — Smallpdf, iLovePDF, Adobe Online — uploads your file to their servers, processes it on hardware you don't control, and emails you a download link. The fine print says they delete it after an hour or a day. The reality is that you handed your contract, tax return, or medical record to a third party, and you have no way to verify what they did with it. CipherForces takes the opposite approach: every PDF tool runs entirely inside your browser using WebAssembly builds of pdf-lib, pdfjs-dist, and tesseract.js. Open DevTools, watch the Network tab, drop your file in — you will not see a single upload request. The math is the same; the privacy posture is the inverse.
Put page numbers on every page of a PDF.
Open toolHighlight text, draw on pages, and add inline text notes to any PDF.
Open toolJoin multiple PDF files into one document.
Open toolVisual pixel-level or text line-level diff between two PDFs, page by page.
Open toolMake PDF files smaller without losing quality.
Open toolTrim the margins of PDF pages.
Open toolPull every embedded image out of a PDF as PNGs — individually or as a zip.
Open toolType into fillable PDF forms.
Open toolLock AcroForm field values into the page so the form can no longer be edited.
Open toolTurn images into a PDF document.
Open toolTurn any Markdown into a beautifully formatted PDF — headings, code, tables.
Open toolAdd a password to lock your PDF.
Open toolCompress, watermark, and protect multiple PDFs at once.
Open toolExtract text from scanned PDFs as a plain-text file using in-browser OCR.
Open toolConvert PDF pages into JPG or PNG images.
Open toolConvert PDF files to editable .docx Word documents — entirely in your browser.
Open toolBlack out sensitive text in a PDF.
Open toolDrag pages to rearrange your PDF.
Open toolRotate any page in your PDF.
Open toolDraw or type your signature on a PDF.
Open toolBreak a PDF into separate pages or sections.
Open toolRemove password protection from a PDF.
Open toolAdd text or image watermarks to every page.
Open toolEvery PDF you process — merge, split, compress, OCR, redact, sign — runs locally. No upload, no server-side storage, no auto-delete-after-an-hour theater.
WebAssembly builds run in any modern browser. iPhone Safari, Chrome on Android, Firefox on Linux — same toolset.
A 50-page contract, a 200-page eBook, a 600-MB scanned archive — runs the same as a one-pager. No watermark, no signup, no email gate.
Merge, split, compress, OCR, redact, password-protect, watermark, page numbers, page reorder, signature, form-fill — all included. Pay once if you want unlimited; the daily free tier covers most use.
Use our PDF Redactor tool. It loads your file in the browser, lets you drag rectangles over sensitive content, and re-exports a flattened PDF with the redacted regions baked in as black bars. The original file never leaves your device.
Yes. PDF OCR runs Tesseract.js (the same OCR engine Google originally built) entirely in your browser. Works on most languages. Larger files take longer but never hit a server.
Most PDFs you process at home contain something sensitive — bank statements, medical bills, school records, contracts, tax returns. Every cloud PDF service is a third-party data processor with its own breach risk. Browser-only tools eliminate the entire category of risk.
84 browser-based tools across PDF, image, audio, developer, business, and security categories. All free for daily use; one-time license for unlimited.