Hallo PDF · built from the ISO 32000 spec · runs on your device
Everything runs in your browser on an engine written from scratch — parser, renderer, and writer compiled to WebAssembly. Nothing is uploaded, there is nothing to install, and there are no sign-ups, limits, or watermarks. Scroll up, drop in a PDF, and start editing.
Not a viewer with a highlighter — a real editor, end to end.
Change existing text — with paragraph reflow — or add new text, shapes, and images anywhere on the page.
Highlight, underline, strike through, comment, draw freehand, add callouts, stamps, and revision clouds.
Permanent redaction that removes the text from the file — not a black box on top — so it can't be copied or recovered.
Fill form fields, create your own text and checkbox fields, flatten forms, sign PDFs, and verify signatures.
Reorder, rotate, delete, duplicate, crop, insert, extract, add page numbers, or lay out pages 2-up and 4-up.
Combine documents, split by page ranges or every N pages, or drag pages between two PDFs side by side.
Make scans searchable and copyable. OCR is bundled with the app and runs locally — no cloud service involved.
Password-protect documents, add watermarks, edit metadata and bookmarks, and optimize file size.
Save as PDF, export to Word (.docx) or plain text, or render pages out as PNG and JPG images.
Most “online PDF editors” upload your document to a server and put a delete promise in their privacy policy. This one can't see your files in the first place: the engine is implemented from the ISO 32000 PDF specification and ships to your browser as WebAssembly. Open a contract, a medical record, or anything else — it is parsed, rendered, edited, and saved on your device. Disconnect from the network and it keeps working; install it as an app and keep it.
Drop a PDF onto the page or pick one with the file chooser. It loads instantly — there is no upload step.
Pick a tool from the rail — text, shapes, highlight, redact, crop — or press Ctrl/⌘-K and type what you want to do.
Download the edited PDF, or export to Word, text, or images. Undo history covers every step along the way.
In a hurry? Each of these opens a focused page that does exactly one thing.
Yes. Every feature — editing text, redacting, OCR, signing, exporting — is free, with no sign-up, no file-size or daily limits, and no watermark on your documents.
No. The entire editor — parser, renderer, and writer — runs in your browser as WebAssembly. Files are opened and saved on your device and never leave it. It even keeps working with your network disconnected.
Yes. The Edit text tool changes existing lines in place, and paragraph editing reflows the surrounding text. You can also add new text, shapes, and images anywhere.
Yes. Applying a redaction removes the covered text and content from the file itself — it is not just a black box drawn on top — so it cannot be copied or recovered. You can additionally flatten pages to images.
Yes. After your first visit it works fully offline, and you can install it as an app from your browser. OCR is bundled too — no CDN, no third-party requests.
Word (.docx), plain text, and PNG or JPG images of pages — alongside normal PDF saving, of course.