Documents / Runs in your browser
Free PDF editor that runs in your browser
View, edit text, annotate, sign, organize pages, combine and watermark PDFs. The file never leaves your tab.
- Free, no account
- Downloads a WebAssembly engine once
Your PDF is opened and edited by a WebAssembly engine inside this tab. Nothing is uploaded. The engine (about 2.5 MB compressed) and any fonts it needs are downloaded once from this site.
How it works
- 01
Open a PDF from your device (or drop it onto the editor), or start with a blank page. Several documents can be open as tabs.
- 02
Pick a workspace: View to read, search and copy; Edit to move, resize or rewrite text and add text boxes; Annotate to highlight, underline or draw; Fill & Sign to place a signature or a date; Pages to reorder, rotate, duplicate, insert or delete pages.
- 03
Use the toolbar for the rest: combine PDFs, add a text watermark, find and replace, edit the outline, compress a lossless copy, or change the title and author. Undo and redo cover every change.
- 04
Press Save. Your browser shows its save dialog where it supports one, otherwise the PDF downloads. The saved file keeps real, selectable text.
Questions
Is my PDF uploaded anywhere?
No. The editing engine (PDFium plus MoonPDF's own text-authoring core) is compiled to WebAssembly and runs inside this browser tab. The only downloads are the engine itself and, when you add text, the font files it needs, both served from this site. Saving hands the finished PDF to your browser.
What can it not do?
It does not fill PDF forms, redact content, apply certificate-based digital signatures, open password-protected PDFs, or export pages as images. Signatures are visual placements, not cryptographic ones. Undo keeps the last 8 document changes.
Does editing text keep the original font?
When the document's embedded font can carry the edit, yes. When it cannot, the text is re-authored with a metric-compatible substitute (Arial to Liberation Sans, Times to Liberation Serif, Calibri to Carlito, Cambria to Caladea) instead of being corrupted or refused. Text inside form XObjects (some generator-produced layouts) can be lost on save, so check the result before replacing your original.
Where do my signatures and bookmarks go?
Saved signatures, personal bookmarks and per-file view settings live in this browser's local storage under gixts-pdf-* keys. They never leave the device and clearing site data removes them.
How is this different from the MoonPDF desktop app?
It is the same engine and the same editor. The desktop app adds features that need the file system or native tools: session restore and recents, crash-recovery drafts, file conversion, page image and text export, password-protected files, and text recognition (OCR).
Built with PDFium (BSD-3-Clause), pdfium-lib wasm build (BSD-3-Clause), Liberation, Carlito, Caladea and Great Vibes fonts (OFL).