Apps / PDF editorBeta

Edit a PDF without uploading it.

Name: PDF Editor
Author: Tenziki Studio

A free PDF editor that runs entirely in your browser. Change the words already on the page, sign, fill in forms, redact and rearrange pages. Your file stays on your device.

Open edit.tenziki.com ↗All apps

What it does

PDF Editor

01
Click the text and change it
Click a line and its whole paragraph opens for editing. It re-wraps as you type and keeps the document’s font when that font has the letters. Lines you don’t change stay exactly as they were.
02
Your file stays with you
There’s no upload and no account. The site is static files with no server behind them, and its security policy stops the page sending data to any other site.
03
Text stays text
Pages are never turned into images or outlines, so text stays selectable and searchable. What you add is saved as standard PDF annotations that other PDF apps can read.
04
Redaction that really removes
Draw a box and the text, image pixels, hidden OCR text and form values under it are taken out of the file, not just covered with black.
05
Sign on the page or with a certificate
Draw, type or upload a signature, or sign digitally with a .p12 or .pfx certificate file, in a box you place. For a CAC or other smart card, add a blank field and sign it in Adobe Acrobat Reader.
06
Mark up and rearrange
Fill in forms, add text and images, highlight and draw. Reorder, rotate, delete and extract pages, number them, and add or remove a password. One Undo button covers all of it.

Under the hood

App: Vite and TypeScript, a static site on Cloudflare with no back end. Installable, and works offline after the first visit
PDF engines: pdf.js for viewing and annotations, PDFium in WebAssembly for changing page text, LibPDF for page changes. PDFium is a 4.6 MB download, fetched the first time you use Edit text or Redact
Privacy: No analytics, accounts or upload. Unsaved work is kept in your browser so it can be restored after a crash, and never leaves the device
Saving: Chrome and Edge on a computer can keep saving to the file you choose. Other browsers download a copy, and phones offer the share sheet too. Changing a digitally signed PDF asks first, because it breaks the signature
Signing: PAdES signatures made in the browser and appended to the file, so earlier signatures stay valid. Your certificate and password aren’t uploaded or kept. The app doesn’t check signatures, so use Adobe or similar for that, and a signer only shows as trusted if the reader trusts the certificate’s issuer
Limits: Text below a paragraph doesn’t move down when the paragraph grows. Vertical text can’t be edited, and new Chinese, Arabic and similar letters only work if the original font has them. Redaction doesn’t change bookmarks or the document title
Status: Beta. Tested in phone emulation and Safari’s engine, not yet on a physical iPhone or Android phone. Certificate signatures were checked with OpenSSL and pyHanko, not yet in Adobe or with a real CAC